id int64 5 1.93M | title stringlengths 0 128 | description stringlengths 0 25.5k | collection_id int64 0 28.1k | published_timestamp timestamp[s] | canonical_url stringlengths 14 581 | tag_list stringlengths 0 120 | body_markdown stringlengths 0 716k | user_username stringlengths 2 30 |
|---|---|---|---|---|---|---|---|---|
1,876,198 | EasyLog Library | Say hello to consistent and structured logging with EasyLog! 🚀 Enjoy ✨ Context-Aware Logging: Enjoy... | 0 | 2024-06-04T05:49:52 | https://dev.to/codaarx/easylog-library-1fmc | android, kotlin, mobile, androiddev | Say hello to consistent and structured logging with EasyLog! 🚀
Enjoy
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1,876,197 | The Future of Blockchain Gaming on Solana | The blockchain gaming industry is rapidly growing but lacks games that truly excite players... | 27,548 | 2024-06-04T05:49:37 | https://dev.to/aishikl/the-future-of-blockchain-gaming-on-solana-2glo | # The blockchain gaming industry is rapidly growing but lacks games that truly excite players about blockchain technology. Many current games are overly focused on the 'token economy' model, limiting their appeal and sophistication. Solana aims to revolutionize this space by offering a more immersive and competitive gaming experience, leveraging its fast, scalable blockchain and strong ecosystem. With significant backing and innovative projects, Solana has the potential to attract high-spending gamers from established economies, creating a more engaging and lucrative blockchain gaming market.
#rapidinnovation#BlockchainGaming #Solana #NFTGames #CryptoGaming #GamingRevolution
link: http://www.rapidinnovation.io/post/the-future-of-blockchain-gaming-on-solana | aishikl | |
1,876,196 | Blockchain-Based Streaming for Fairer Content Monetization | The world of streaming reigns supreme in entertainment. From music and movies to live broadcasts and... | 0 | 2024-06-04T05:47:06 | https://dev.to/donnajohnson88/blockchain-based-streaming-for-fairer-content-monetization-471o | blockchain, streaming, learning, development | The world of streaming reigns supreme in entertainment. From music and movies to live broadcasts and educational lectures, [blockchain streaming development](https://blockchain.oodles.io/blockchain-video-streaming-solutions/?utm_source=devto) offers unparalleled convenience and accessibility for content consumption. However, the current system feels unbalanced for the creators who fuel this multi-billion dollar industry. Centralised platforms are certainly useful, but creators often feel undervalued and underpaid for them. Unfair revenue-sharing agreements and opaque algorithms make it impossible for many people to make a livelihood off of their work. A promising game-changer that might upend the existing quo and shift the direction of content development is blockchain-based streaming.
In this blog post, discover how this blockchain leverages decentralization to offer a fairer and more equitable content streaming ecosystem.
## How Blockchain Empowers Creators?
Here’s how blockchain empowers creators:
**Decentralized Power: Shifting Control to Creators**
Traditionally, streaming platforms act as gatekeepers, controlling everything from content distribution to monetization. Blockchain disrupts this centralized model by creating a decentralized network. Under this new paradigm, transactions are verified and stored by a distributed network of computers as opposed to a single body. Creators now have greater control and understanding of how their work is consumed.
**Smart Contracts: Automating Fairness**
Smart contracts and self-executing agreements within the blockchain ecosystem eliminate the need for intermediaries. When a viewer engages with content, a smart contract can be programmed to distribute royalties to the creator based on pre-defined terms automatically. It eliminates potential disputes and ensures creators receive their fair share promptly and transparently.
**Transparency: Shining a Light on Content Usage**
Blockchain technology operates on a public ledger, meaning every interaction within the network is permanently recorded and readily accessible. It refers to complete transparency in the context of streaming. Both content authors and consumers may monitor royalty payments and viewership in real time. This degree of transparency fosters trust and gives artists insightful information about how their work is being seen.
**New Revenue Streams: Unlocking Creativity and Value**
Blockchain significantly expands the possibilities for content monetization. Beyond traditional subscription models, creators can explore innovative revenue streams:
- Micropayments and Fair Revenue Distribution
Viewers can pay a small fee directly to access specific content, allowing creators to capture value from individual pieces of work. Thanks to reduced intermediaries and automated, transparent royalty payments, content creators receive a more significant share of the revenue generated by their content.
- Fan Engagement Models
These models reward viewers for actively supporting creators, creating a more symbiotic relationship.
- Tokenized Ownership
Perhaps the most intriguing concept is that creators can tokenize their content, granting fans a fractional stake in their success. It opens doors to community building and shared value creation.
Check Out | [Streaming on Blockchain | A Comprehensive Guide](https://blockchain.oodles.io/blog/streaming-on-blockchain-comprehensive-guide/?utm_source=devto)
## Conclusion
Blockchain streaming is still in its early stages, but the potential for a more equitable future is undeniable. Content production might transform thanks to blockchain technology, which can empower artists, promote transparency, and open up new revenue streams. As technology advances, the system will reward content creators for their work, and users will gain greater control over their viewing experience. This shift towards a fairer and more transparent future holds exciting possibilities for creators and audiences alike.
Dreaming of a revolutionary streaming platform that empowers creators and captivates audiences? Look no further than Oodles Blockchain! We combine cutting-edge blockchain technology with our skilled [blockchain developers](https://blockchain.oodles.io/about-us/?utm_source=devto) to craft dynamic and user-friendly streaming applications. | donnajohnson88 |
1,876,195 | Hallmark Treasor Gandipet Hyderabad | Hallmark Treasor Gandipet | Hallmark Treasor is nestled in the prestigious Gandipet area of Hyderabad. This community offers a... | 0 | 2024-06-04T05:44:48 | https://dev.to/narendra_kumar_5138507a03/hallmark-treasor-gandipet-hyderabad-hallmark-treasor-gandipet-14kb | realestate, realestateagent, realestateinvestment, hallmarktreasor | Hallmark Treasor is nestled in the prestigious Gandipet area of Hyderabad. This community offers a serene escape from the city's hustle and bustle while ensuring easy access to urban amenities.
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Discover a home where every detail is crafted for your utmost delight, blending refined living with the perfect balance of serenity and convenience. Experience the joy and satisfaction of residing in a thoughtfully designed community at Hallmark Treasor.
Contact us: 8595808895
| narendra_kumar_5138507a03 |
1,876,194 | The Ultimate Guide to the Best Cold Email Tools for 2024 | In the fast-paced world of sales and marketing, reaching out to potential clients through cold emails... | 0 | 2024-06-04T05:44:06 | https://dev.to/pardeep_sharma_ecf017f389/the-ultimate-guide-to-the-best-cold-email-tools-for-2024-ope | In the fast-paced world of sales and marketing, reaching out to potential clients through cold emails remains one of the most effective strategies. However, crafting and sending cold emails can be time-consuming and challenging without the right tools. That’s where SalesBlink comes in. As a leader in the field, SalesBlink offers some of the best cold email tools designed to streamline your outreach process and maximize your success rate.
**Why Cold Emailing Works**
Cold emailing is a powerful tactic for connecting with potential clients who may not be aware of your product or service. When done correctly, it can open doors to new opportunities, establish relationships, and ultimately drive sales. The key to effective cold emailing lies in personalization, timing, and consistency – all areas where the [best cold email tools ](https://salesblink.io/cold-email-outreach)excel.
**Introducing SalesBlink:** The Best Cold Email Tools for Your Business
SalesBlink is your one-stop solution for all your cold email needs. With a suite of features specifically designed to enhance your outreach, SalesBlink ensures that your emails not only get delivered but also get opened and read. Here’s why SalesBlink offers the best cold email tools for your business:
1. **Personalization at Scale
One of the standout features of SalesBlink is its ability to personalize emails at scale. With dynamic fields and templates, you can tailor each email to the recipient’s specifics, increasing engagement and response rates. Personalization has never been easier or more effective.
2.** Automated Follow-Ups**
Timing is crucial in cold emailing. SalesBlink’s automated follow-up feature ensures that you never miss an opportunity to connect with a prospect. Set up sequences and let the tool handle the follow-ups, so you can focus on other important tasks.
3. **Advanced Analytics**
Understanding the performance of your email campaigns is essential for continual improvement. SalesBlink provides detailed analytics and reports, giving you insights into open rates, click-through rates, and response rates. With this data, you can refine your strategies and achieve better results.
4. **Easy Integration**
SalesBlink integrates seamlessly with your existing CRM and email platforms, making it easy to incorporate into your current workflow. This compatibility ensures a smooth transition and enhances the efficiency of your sales process.
5. **Compliance and Deliverability**
SalesBlink prioritizes compliance with email regulations and ensures high deliverability rates. With features like email verification and list cleaning, you can be confident that your emails will reach the intended recipients without landing in the spam folder.
How to Get Started with SalesBlink
Getting started with SalesBlink is simple. Sign up for an account, import your contact lists, and start crafting personalized emails. With user-friendly interfaces and comprehensive support, SalesBlink makes the process straightforward, even for those new to cold emailing.
**Conclusion**
In the competitive world of sales, having the right tools can make all the difference. SalesBlink provides the best cold email tools to help you reach your targets effectively and efficiently. With features that cater to personalization, automation, analytics, and compliance, SalesBlink stands out as the go-to solution for businesses looking to enhance their cold email campaigns.
Experience the power of the best cold email tools with SalesBlink and take your outreach to the next level. Sign up today and see the difference it can make for your business.
| pardeep_sharma_ecf017f389 | |
1,876,193 | How to create an Authentication & Authorization feature in Next JS 14 with another backend? | To create an authentication and authorization feature in Next.js 14 with another backend, you... | 0 | 2024-06-04T05:42:51 | https://dev.to/nadim_ch0wdhury/how-to-create-an-authentication-authorization-feature-in-next-js-14-with-another-backend-3elh | To create an authentication and authorization feature in Next.js 14 with another backend, you typically need to use a third-party authentication provider or a custom backend API. Here, I'll demonstrate how to do this using Next.js with NextAuth.js as the authentication library and a custom backend (e.g., an Express.js server) for handling authentication logic.
### Step 1: Set Up the Next.js Project
1. **Initialize a New Project:**
```bash
npx create-next-app@latest my-nextjs-app
cd my-nextjs-app
```
2. **Install Required Packages:**
```bash
npm install next-auth axios
```
### Step 2: Configure NextAuth.js
1. **Create the Auth API Route:**
Create `src/pages/api/auth/[...nextauth].js`:
```javascript
import NextAuth from 'next-auth';
import Providers from 'next-auth/providers';
import axios from 'axios';
export default NextAuth({
providers: [
Providers.Credentials({
async authorize(credentials) {
try {
const res = await axios.post('http://localhost:4000/api/auth/login', {
email: credentials.email,
password: credentials.password,
});
if (res.data && res.data.token) {
return { token: res.data.token, user: res.data.user };
}
return null;
} catch (error) {
throw new Error('Invalid email or password');
}
},
}),
],
callbacks: {
async jwt(token, user) {
if (user) {
token.accessToken = user.token;
token.user = user.user;
}
return token;
},
async session(session, token) {
session.accessToken = token.accessToken;
session.user = token.user;
return session;
},
},
pages: {
signIn: '/login',
},
});
```
### Step 3: Create the Custom Backend (Express.js)
1. **Set Up an Express.js Server:**
```bash
mkdir my-express-backend
cd my-express-backend
npm init -y
npm install express mongoose bcryptjs jsonwebtoken cors
```
2. **Configure Environment Variables:**
Create a `.env` file in the root of your backend project:
```plaintext
PORT=4000
MONGODB_URI=mongodb://localhost:27017/auth-db
JWT_SECRET=your_jwt_secret
```
3. **Create User Model:**
Create `src/models/User.js`:
```javascript
const mongoose = require('mongoose');
const bcrypt = require('bcryptjs');
const UserSchema = new mongoose.Schema({
name: { type: String, required: true },
email: { type: String, required: true, unique: true },
password: { type: String, required: true },
});
UserSchema.pre('save', async function(next) {
if (!this.isModified('password')) return next();
const salt = await bcrypt.genSalt(10);
this.password = await bcrypt.hash(this.password, salt);
next();
});
UserSchema.methods.matchPassword = async function(enteredPassword) {
return await bcrypt.compare(enteredPassword, this.password);
};
module.exports = mongoose.model('User', UserSchema);
```
4. **Create Authentication Controller:**
Create `src/controllers/authController.js`:
```javascript
const jwt = require('jsonwebtoken');
const User = require('../models/User');
const bcrypt = require('bcryptjs');
exports.registerUser = async (req, res) => {
const { name, email, password } = req.body;
const userExists = await User.findOne({ email });
if (userExists) return res.status(400).json({ message: 'User already exists' });
const user = await User.create({ name, email, password });
if (user) {
res.status(201).json({ message: 'User registered successfully' });
} else {
res.status(400).json({ message: 'Invalid user data' });
}
};
exports.loginUser = async (req, res) => {
const { email, password } = req.body;
const user = await User.findOne({ email });
if (!user || !(await user.matchPassword(password))) {
return res.status(401).json({ message: 'Invalid email or password' });
}
const token = jwt.sign({ id: user._id }, process.env.JWT_SECRET, { expiresIn: '1h' });
res.json({ token, user: { id: user._id, name: user.name, email: user.email } });
};
```
5. **Create Routes:**
Create `src/routes/authRoutes.js`:
```javascript
const express = require('express');
const { registerUser, loginUser } = require('../controllers/authController');
const router = express.Router();
router.post('/register', registerUser);
router.post('/login', loginUser);
module.exports = router;
```
6. **Set Up Express.js Server:**
Create `src/index.js`:
```javascript
const express = require('express');
const mongoose = require('mongoose');
const cors = require('cors');
const authRoutes = require('./routes/authRoutes');
require('dotenv').config();
const app = express();
app.use(cors());
app.use(express.json());
mongoose.connect(process.env.MONGODB_URI, {
useNewUrlParser: true,
useUnifiedTopology: true,
});
app.use('/api/auth', authRoutes);
const PORT = process.env.PORT || 4000;
app.listen(PORT, () => {
console.log(`Server running on port ${PORT}`);
});
```
### Step 4: Set Up Client-Side Authentication in Next.js
1. **Create Login Page:**
Create `src/pages/login.js`:
```javascript
import { useState } from 'react';
import { signIn } from 'next-auth/react';
import { useRouter } from 'next/router';
const Login = () => {
const [email, setEmail] = useState('');
const [password, setPassword] = useState('');
const [error, setError] = useState('');
const router = useRouter();
const handleSubmit = async (e) => {
e.preventDefault();
const result = await signIn('credentials', {
redirect: false,
email,
password,
});
if (result.ok) {
router.push('/');
} else {
setError(result.error);
}
};
return (
<form onSubmit={handleSubmit}>
<div>
<label>Email</label>
<input type="email" value={email} onChange={(e) => setEmail(e.target.value)} />
</div>
<div>
<label>Password</label>
<input type="password" value={password} onChange={(e) => setPassword(e.target.value)} />
</div>
{error && <p>{error}</p>}
<button type="submit">Login</button>
</form>
);
};
export default Login;
```
2. **Protect Pages (Client-Side):**
Create a higher-order component (HOC) to protect pages:
```javascript
import { useSession } from 'next-auth/react';
import { useRouter } from 'next/router';
import { useEffect } from 'react';
const withAuth = (WrappedComponent) => {
return (props) => {
const { data: session, status } = useSession();
const router = useRouter();
useEffect(() => {
if (status === 'unauthenticated') {
router.replace('/login');
}
}, [status, router]);
if (status === 'authenticated') {
return <WrappedComponent {...props} />;
}
return null;
};
};
export default withAuth;
```
Usage:
```javascript
import withAuth from '../path/to/withAuth';
const ProtectedPage = () => {
return (
<div>
<h1>Protected Content</h1>
</div>
);
};
export default withAuth(ProtectedPage);
```
### Step 5: Start the Applications
1. **Run the Next.js Application:**
```bash
npm run dev
```
2. **Run the Express.js Backend:**
```bash
node src/index.js
```
### Step 6: Test the Application
1. **Register a User:**
- Use a tool like Postman to send a POST request to `http://localhost:4000/api/auth/register` with the user's details.
2. **Login a User:**
- Navigate to `/login` in your Next.js application and log in with the registered user.
3. **Access Protected Page:**
- Navigate to a protected page, e.g., `/profile`, to ensure it redirects to `/login` when not authenticated and displays the content when authenticated.
This guide provides a foundational approach to implementing authentication and authorization in a Next.js 14 application with a separate backend. You can further expand and customize it based on your application's requirements.
Disclaimer: This content is generated by AI. | nadim_ch0wdhury | |
1,876,190 | How to create an Authentication & Authorization feature in Next JS 14? | Creating an authentication and authorization feature in Next.js 14 involves several steps. Here’s a... | 0 | 2024-06-04T05:41:14 | https://dev.to/nadim_ch0wdhury/how-to-create-an-authentication-authorization-feature-in-next-js-14-232g | Creating an authentication and authorization feature in Next.js 14 involves several steps. Here’s a comprehensive guide to help you implement it:
### Step 1: Set Up a New Next.js Project
1. **Initialize a New Project**:
```bash
npx create-next-app@latest my-nextjs-app
cd my-nextjs-app
```
2. **Install Required Packages**:
```bash
npm install next-auth mongoose bcryptjs
```
### Step 2: Configure MongoDB
1. **Create a `.env.local` File**:
```plaintext
MONGODB_URI=mongodb://localhost:27017/auth-db
NEXTAUTH_URL=http://localhost:3000
NEXTAUTH_SECRET=your_secret_key
```
### Step 3: Set Up Mongoose Models
1. **Create a Directory Structure**:
```bash
mkdir -p src/models src/lib
```
2. **Create User Model**:
Create `src/models/User.js`:
```javascript
import mongoose from 'mongoose';
const UserSchema = new mongoose.Schema({
name: {
type: String,
required: true,
},
email: {
type: String,
required: true,
unique: true,
},
password: {
type: String,
required: true,
},
});
UserSchema.pre('save', async function(next) {
if (!this.isModified('password')) {
return next();
}
const salt = await bcrypt.genSalt(10);
this.password = await bcrypt.hash(this.password, salt);
next();
});
export default mongoose.models.User || mongoose.model('User', UserSchema);
```
3. **Create MongoDB Connection Utility**:
Create `src/lib/mongodb.js`:
```javascript
import mongoose from 'mongoose';
const connectDB = async () => {
if (mongoose.connections[0].readyState) {
return;
}
await mongoose.connect(process.env.MONGODB_URI, {
useNewUrlParser: true,
useUnifiedTopology: true,
});
};
export default connectDB;
```
### Step 4: Configure NextAuth.js
1. **Create the Auth API Route**:
Create `src/pages/api/auth/[...nextauth].js`:
```javascript
import NextAuth from 'next-auth';
import Providers from 'next-auth/providers';
import bcrypt from 'bcryptjs';
import connectDB from '../../../lib/mongodb';
import User from '../../../models/User';
export default NextAuth({
providers: [
Providers.Credentials({
async authorize(credentials) {
await connectDB();
const user = await User.findOne({ email: credentials.email });
if (user && (await bcrypt.compare(credentials.password, user.password))) {
return { name: user.name, email: user.email };
}
throw new Error('Invalid email or password');
},
}),
],
database: process.env.MONGODB_URI,
secret: process.env.NEXTAUTH_SECRET,
session: {
jwt: true,
},
callbacks: {
async jwt(token, user) {
if (user) {
token.id = user.id;
}
return token;
},
async session(session, token) {
session.user.id = token.id;
return session;
},
},
});
```
### Step 5: Set Up Registration API Route
1. **Create Registration API Route**:
Create `src/pages/api/auth/register.js`:
```javascript
import connectDB from '../../../lib/mongodb';
import User from '../../../models/User';
export default async function handler(req, res) {
if (req.method === 'POST') {
await connectDB();
const { name, email, password } = req.body;
const userExists = await User.findOne({ email });
if (userExists) {
return res.status(400).json({ message: 'User already exists' });
}
const user = await User.create({ name, email, password });
if (user) {
res.status(201).json({
_id: user._id,
name: user.name,
email: user.email,
});
} else {
res.status(400).json({ message: 'Invalid user data' });
}
} else {
res.status(405).json({ message: 'Method not allowed' });
}
}
```
### Step 6: Set Up Client-Side Authentication
1. **Create a Registration Page**:
Create `src/pages/register.js`:
```javascript
import { useState } from 'react';
import { useRouter } from 'next/router';
const Register = () => {
const [name, setName] = useState('');
const [email, setEmail] = useState('');
const [password, setPassword] = useState('');
const [error, setError] = useState('');
const router = useRouter();
const handleSubmit = async (e) => {
e.preventDefault();
const res = await fetch('/api/auth/register', {
method: 'POST',
headers: {
'Content-Type': 'application/json',
},
body: JSON.stringify({ name, email, password }),
});
if (res.ok) {
router.push('/login');
} else {
const data = await res.json();
setError(data.message);
}
};
return (
<form onSubmit={handleSubmit}>
<div>
<label>Name</label>
<input type="text" value={name} onChange={(e) => setName(e.target.value)} />
</div>
<div>
<label>Email</label>
<input type="email" value={email} onChange={(e) => setEmail(e.target.value)} />
</div>
<div>
<label>Password</label>
<input type="password" value={password} onChange={(e) => setPassword(e.target.value)} />
</div>
{error && <p>{error}</p>}
<button type="submit">Register</button>
</form>
);
};
export default Register;
```
2. **Create a Login Page**:
Create `src/pages/login.js`:
```javascript
import { useState } from 'react';
import { signIn } from 'next-auth/react';
import { useRouter } from 'next/router';
const Login = () => {
const [email, setEmail] = useState('');
const [password, setPassword] = useState('');
const [error, setError] = useState('');
const router = useRouter();
const handleSubmit = async (e) => {
e.preventDefault();
const result = await signIn('credentials', {
redirect: false,
email,
password,
});
if (result.ok) {
router.push('/');
} else {
setError(result.error);
}
};
return (
<form onSubmit={handleSubmit}>
<div>
<label>Email</label>
<input type="email" value={email} onChange={(e) => setEmail(e.target.value)} />
</div>
<div>
<label>Password</label>
<input type="password" value={password} onChange={(e) => setPassword(e.target.value)} />
</div>
{error && <p>{error}</p>}
<button type="submit">Login</button>
</form>
);
};
export default Login;
```
3. **Protecting Pages (Client-Side)**:
Create a higher-order component (HOC) to protect pages:
```javascript
import { useSession } from 'next-auth/react';
import { useRouter } from 'next/router';
import { useEffect } from 'react';
const withAuth = (WrappedComponent) => {
return (props) => {
const { data: session, status } = useSession();
const router = useRouter();
useEffect(() => {
if (status === 'unauthenticated') {
router.replace('/login');
}
}, [status, router]);
if (status === 'authenticated') {
return <WrappedComponent {...props} />;
}
return null;
};
};
export default withAuth;
```
Usage:
```javascript
import withAuth from '../path/to/withAuth';
const ProtectedPage = () => {
return (
<div>
<h1>Protected Content</h1>
</div>
);
};
export default withAuth(ProtectedPage);
```
### Step 7: Start the Application
1. **Run the Next.js Application**:
```bash
npm run dev
```
### Step 8: Test the Application
1. **Register a User**:
- Navigate to `/register` and create a new user.
2. **Login a User**:
- Navigate to `/login` and log in with the newly created user.
3. **Access Protected Page**:
- Navigate to a protected page, e.g., `/profile`, to ensure it redirects to `/login` when not authenticated and displays the content when authenticated.
This guide provides a foundational approach to implementing authentication and authorization in a Next.js 14 application. You can further expand and customize it based on your application's requirements.
Disclaimer: This content is generated by AI. | nadim_ch0wdhury | |
1,876,189 | How to create an Authentication & Authorization feature in Express JS RESTful API? | Creating an authentication and authorization feature in an Express.js RESTful API involves several... | 0 | 2024-06-04T05:38:23 | https://dev.to/nadim_ch0wdhury/how-to-create-an-authentication-authorization-feature-in-express-js-restful-api-ge8 | Creating an authentication and authorization feature in an Express.js RESTful API involves several steps. Here's a step-by-step guide:
### Step 1: Set Up a New Express.js Project
1. **Initialize a New Project**:
```bash
mkdir project-name
cd project-name
npm init -y
```
2. **Install Required Packages**:
```bash
npm install express mongoose jsonwebtoken bcryptjs
npm install dotenv passport passport-jwt
```
### Step 2: Configure Environment Variables
1. **Create a `.env` File**:
```plaintext
PORT=3000
MONGODB_URI=mongodb://localhost:27017/auth-db
JWT_SECRET=your_jwt_secret
```
2. **Load Environment Variables**:
Create `config.js` to load environment variables:
```javascript
require('dotenv').config();
module.exports = {
port: process.env.PORT || 3000,
mongodbUri: process.env.MONGODB_URI,
jwtSecret: process.env.JWT_SECRET,
};
```
### Step 3: Set Up Mongoose Models
1. **Create a Directory Structure**:
```bash
mkdir -p src/models src/controllers src/routes src/middleware
```
2. **Create User Model**:
Create `src/models/User.js`:
```javascript
const mongoose = require('mongoose');
const bcrypt = require('bcryptjs');
const userSchema = new mongoose.Schema({
username: {
type: String,
required: true,
unique: true,
},
email: {
type: String,
required: true,
unique: true,
},
password: {
type: String,
required: true,
},
});
userSchema.pre('save', async function(next) {
if (!this.isModified('password')) {
return next();
}
const salt = await bcrypt.genSalt(10);
this.password = await bcrypt.hash(this.password, salt);
next();
});
userSchema.methods.matchPassword = async function(enteredPassword) {
return await bcrypt.compare(enteredPassword, this.password);
};
const User = mongoose.model('User', userSchema);
module.exports = User;
```
### Step 4: Set Up Controllers
1. **Create Auth Controller**:
Create `src/controllers/authController.js`:
```javascript
const jwt = require('jsonwebtoken');
const User = require('../models/User');
const config = require('../../config');
const generateToken = (id) => {
return jwt.sign({ id }, config.jwtSecret, { expiresIn: '1h' });
};
exports.registerUser = async (req, res) => {
const { username, email, password } = req.body;
const userExists = await User.findOne({ email });
if (userExists) {
return res.status(400).json({ message: 'User already exists' });
}
const user = await User.create({ username, email, password });
if (user) {
res.status(201).json({
_id: user._id,
username: user.username,
email: user.email,
token: generateToken(user._id),
});
} else {
res.status(400).json({ message: 'Invalid user data' });
}
};
exports.loginUser = async (req, res) => {
const { email, password } = req.body;
const user = await User.findOne({ email });
if (user && (await user.matchPassword(password))) {
res.json({
_id: user._id,
username: user.username,
email: user.email,
token: generateToken(user._id),
});
} else {
res.status(401).json({ message: 'Invalid email or password' });
}
};
exports.getUserProfile = async (req, res) => {
const user = await User.findById(req.user.id);
if (user) {
res.json({
_id: user._id,
username: user.username,
email: user.email,
});
} else {
res.status(404).json({ message: 'User not found' });
}
};
```
### Step 5: Set Up Routes
1. **Create Auth Routes**:
Create `src/routes/authRoutes.js`:
```javascript
const express = require('express');
const { registerUser, loginUser, getUserProfile } = require('../controllers/authController');
const { protect } = require('../middleware/authMiddleware');
const router = express.Router();
router.post('/register', registerUser);
router.post('/login', loginUser);
router.get('/profile', protect, getUserProfile);
module.exports = router;
```
### Step 6: Set Up Middleware
1. **Create Auth Middleware**:
Create `src/middleware/authMiddleware.js`:
```javascript
const jwt = require('jsonwebtoken');
const User = require('../models/User');
const config = require('../../config');
exports.protect = async (req, res, next) => {
let token;
if (
req.headers.authorization &&
req.headers.authorization.startsWith('Bearer')
) {
try {
token = req.headers.authorization.split(' ')[1];
const decoded = jwt.verify(token, config.jwtSecret);
req.user = await User.findById(decoded.id).select('-password');
next();
} catch (error) {
res.status(401).json({ message: 'Not authorized, token failed' });
}
}
if (!token) {
res.status(401).json({ message: 'Not authorized, no token' });
}
};
```
### Step 7: Set Up the Express Server
1. **Create the Server**:
Create `src/index.js`:
```javascript
const express = require('express');
const mongoose = require('mongoose');
const bodyParser = require('body-parser');
const config = require('../config');
const authRoutes = require('./routes/authRoutes');
const app = express();
mongoose.connect(config.mongodbUri, {
useNewUrlParser: true,
useUnifiedTopology: true,
useCreateIndex: true,
}).then(() => {
console.log('Connected to MongoDB');
}).catch((err) => {
console.error('Error connecting to MongoDB', err);
});
app.use(bodyParser.json());
app.use('/api/auth', authRoutes);
app.listen(config.port, () => {
console.log(`Server running on http://localhost:${config.port}`);
});
```
### Step 8: Test the API
1. **Register a User**:
```http
POST /api/auth/register
Content-Type: application/json
{
"username": "john",
"email": "john@example.com",
"password": "password"
}
```
2. **Login a User**:
```http
POST /api/auth/login
Content-Type: application/json
{
"email": "john@example.com",
"password": "password"
}
```
3. **Get User Profile (Protected Route)**:
```http
GET /api/auth/profile
Authorization: Bearer <token>
```
This guide provides a foundational approach to implementing authentication and authorization in an Express.js RESTful API. You can further expand and customize it based on your application's requirements.
Disclaimer: This content is generated by AI. | nadim_ch0wdhury | |
1,876,188 | Zeeve Launchpad for Node Sale Infrastructure: Boost Security & Token Utility in Rollups | Zeeve is expanding its rollups-as-a-service (RaaS) offering with an advanced node sale launchpad for... | 0 | 2024-06-04T05:38:19 | https://www.zeeve.io/blog/zeeve-launchpad-for-node-sale-infrastructure-boost-security-token-utility-in-rollups/ | rollups | <p>Zeeve is expanding its <a href="https://www.zeeve.io/rollups/">rollups-as-a-service (RaaS)</a> offering with an advanced node sale launchpad for the node sale infrastructure. All kinds of optimistic rollup projects seeking to add an additional security and monitoring layer can leverage the Launchpad service to implement a robust verifier node system in their ecosystem. And, with that, web3 projects can create new paths for enhanced security, additional token utility and funding options. Let’s dive deeper to understand more about Zeeve’s Verifier node sale launchpad also while briefing verifier nodes, the node sale process, and the projects that have announced verifier node sale. </p>
<h2 class="wp-block-heading" id="h-what-exactly-are-verifier-nodes">What exactly are verifier nodes?</h2>
<p>Verifier nodes, also sometimes called checker or sentry nodes, refer to an additional standalone component responsible for maintaining security and robustness for <a href="https://www.zeeve.io/appchains/optimistic-rollups/">Layer2 optimistic rollups</a>. Instead of assuming the transactions to be valid after the challenge period, you can actually appoint honest third-party screeners who will proactively monitor the entire on-chain operations and ensure there are no errors or malicious activities that potentially hamper security and decentralization. </p>
<figure class="wp-block-image aligncenter size-large"><a href="https://www.zeeve.io/appchains/optimistic-rollups/"><img src="https://www.zeeve.io/wp-content/uploads/2024/05/Launch-DevNet-for-your-preferred-Optimistic-Rollup-in-a-snap-1024x213.jpg" alt="Verifier Node Sale Launchpad" class="wp-image-68638"/></a></figure>
<p>Projects are free to set criteria for operators interested in running verifier nodes. For example, the staking requirement can differ, hardware requirements can be distinct, etc. With everything in place, you can simply sell node licenses to the node operators so that they can set up and run nodes on their system. However, rollups first need to add a verifier node layer into their protocol, which can be complex. And that’s where Zeeve’s verifier node sale infrastructure helps. We will learn more about this later in the article.</p>
<h2 class="wp-block-heading" id="h-why-are-more-l2-l3-rollups-opting-for-node-sales-nbsp">Why are more L2/L3 rollups opting for node sales? </h2>
<p>Following are some of the top benefits that Layer2/ Layer3 Optimistic rollups can leverage through verifier nodes:</p>
<li><strong>Enhanced network security & decentralization: </strong></li>
<p>The most important role of verifier nodes is to act as a powerful, unbiased screener for the rollup transactions, ensuring security compliance and standards at each network layer. Note that verifier nodes do more than just detect fraudulent activities. They are optimized to achieve significant enforcement against misbehaving nodes and protect users’ sensitive data. Due to their decentralized structure, verifier nodes eliminate challenges like single points of failure to achieve greater reliability.</p>
<li><strong>Additional token utility:</strong></li>
<p>Adding more utility to native tokens can be a challenge for independent Rollups. That’s because tokenomics in L2/L3s are not as mature as established layer1 blockchains. Through verifier nodes, networks allow node operators to lock/stake their tokens, pay a transaction fee in the native token, and receive an incentive in the same native token for their contribution to ensuring security and decentralization. This way, rollups add significant utility to their token and generate its higher demand.</p>
<li><strong>A solid source of funding: </strong></li>
<p>Getting enough funds is definitely a big challenge for Web3 projects. Now, they have another funding option through verifier nodes. By selling the node license for a continued duration, projects can unlock a solid revenue stream to support the development of their protocol in the long run. A good example of this is HYCHAIN, which raised 8M+ funding through the sale of 16000+ node license keys in just 2 days. </p>
<li><strong>Community engagement: </strong></li>
<p>Rollup protocols that want to build their<strong> </strong>brand and reputation often seek better community engagement. Through verifier nodes, optimistic rollups entail the seamless participation of additional, community-run nodes that promote community engagement without much heavy lifting. </p>
<h2 class="wp-block-heading" id="h-how-does-the-entire-node-sale-process-work-nbsp">How does the entire node sale process work? </h2>
<p>Although new, verifier nodes have started getting traction across rollups due to the tremendous benefits we discussed above. However, we must understand that the implementation of an additional validation system like verifier nodes is not supported natively on optimistic rollups as of now. </p>
<p>Therefore, Layer2 rollup projects need the service offered by RaaS providers. These providers allow rollups to seamlessly add verifier node systems to their ecosystem and sell node licenses to eligible operators. The software for implementing verifier nodes and the node license — both components are essential for node sale, which projects require from their RaaS partner.</p>
<h2 class="wp-block-heading" id="h-protocols-that-have-announced-verifier-node-sales-so-far">Protocols that have announced verifier node sales so far:</h2>
<li><strong>Athier- </strong>Aethir, the reliable provider of decentralized GPU cloud infrastructure, announced its AI node sale a few months ago. The network has decided to make 10,000 nodes available for sale via a tiered pricing approach, which will be sold publicly. The initial price for checker nodes is decided to start from $500, and the node license will be sold as NFTs. Further, checker nodes on Athier are transferable 1-year after their sale, and there will be no cap on the number of nodes one can purchase.</li>
<li><strong>KIP protocol-</strong> KIP protocol, one of the pioneers in merging blockchain technology with AI, has recently announced the upcoming sale of KIP checker nodes. It is confirmed that node licenses will be distributed as NFTs to operators. Checker nodes have an important role in the KIP protocol’s overall operation and governance. Hence, these nodes monitor KIP’s distributed verification system and consensus-based checking to ensure the network’s integrity and decentralization remain intact. KIP rewards its node operators with $KIP tokens while claiming to have allotted 20% of the total $KIP token supply as rewards.</li>
<li><strong>XAI Protocol-</strong> XAI, the Ethereum Layer2 scaling solution, has announced the sale of its sentry nodes, which are in charge of monitoring the XAI rollup ecosystem. Node runners on XAI are required to stake esXAI and abide by a probabilistic algorithm to determine their rewards. Starting in 2023, XAI sentry node sales started at $300 for Tier-1 nodes, and the price went up with every tier. Also, XAI claimed that the protocol will only offer 50,000 Sentry nodes. To operate a sentry node, operators must purchase at least 1 Sentry license key, and they successfully pass the KYC screening to be eligible for rewards.</li>
<li><strong>CARV Protocol: </strong>CARV protocol, the modular data layer for enabling seamless exchange of data and value distribution, has announced its verifier node sale. Verifier nodes on CARV validate the on-chain TEE attestations, confirming if the outcome is reliable and their process aligns with the data privacy standards. CARV mainly has two offerings: buy a license key (non-transferrable NFTs) and run a node or delegate your license key to NaaS (node-as–a-service) providers. For both scenarios, CARV claims to distribute 25% of the $CARV token supply to verifiers. </li>
<h2 class="wp-block-heading" id="h-try-zeeve-s-verifier-node-sale-launchpad-super-easy-way-to-sell-node-licenses">Try Zeeve’s verifier node sale launchpad: Super easy way to sell node licenses</h2>
<p>Zeeve’s verifier node sale launchpad is designed to serve all kinds of Optimistic rollup chains. For example, L2s built with Arbitrum Orbit or OP Stack can leverage the launchpad service to add a verifier node layer into their protocol and thereby open up the node license for sale. </p>
<p>Essentially, <a href="https://www.zeeve.io/">Zeeve</a> provides the set of software needed for the implementation of the verifier node infrastructure into rollups, as well as the node license that node operators will buy to run their verifier nodes. </p>
<p>By doing this, Zeeve streamlines verifier node sales for Optimistic L2/L3s, allowing them to leverage benefits like unparalleled security, easy funding, and additional token utility. Here’s an image showing how you can launch & manage verifier node sales with Zeeve in some simple steps:</p>
<p>As discussed, verifier nodes introduce an innovative concept for enhancing security and decentralization on rollup protocols. Looking forward, we expect a lot of <a href="https://www.zeeve.io/appchains/optimistic-rollups/">optimistic rollup</a> L2/L3s, especially for the new players, to leverage verifier nodes into their networks. However, for a simple selling approach, they can always use Zeeve’s verifier node sale launchpad. Also, Zeeve offers node-as—a-service (NaaS) for people interested in running, managing, and scaling verifier nodes with the benefits of a fully hosted service. For other RaaS services or blockchain-related offerings at Zeeve, <a href="https://www.zeeve.io/talk-to-an-expert/">connect with our experts</a>. Mail us your queries or discuss your project requirements in detail on a one-to-one call. </p> | zeeve |
1,876,187 | How to create an Authentication & Authorization feature in Nest JS GraphQL API? | Creating an authentication and authorization feature in a NestJS GraphQL API involves several steps.... | 0 | 2024-06-04T05:36:33 | https://dev.to/nadim_ch0wdhury/how-to-create-an-authentication-authorization-feature-in-nest-js-graphql-api-35em | Creating an authentication and authorization feature in a NestJS GraphQL API involves several steps. Here’s a step-by-step guide:
### Step 1: Set Up a New NestJS Project
1. **Install Nest CLI**:
```bash
npm install -g @nestjs/cli
```
2. **Create a New Project**:
```bash
nest new project-name
```
3. **Navigate to the Project Directory**:
```bash
cd project-name
```
### Step 2: Install Required Packages
1. **Install Necessary Packages**:
```bash
npm install @nestjs/graphql graphql apollo-server-express @nestjs/jwt passport @nestjs/passport passport-jwt bcryptjs
```
### Step 3: Set Up the GraphQL Module
1. **Configure GraphQL Module**:
Open `src/app.module.ts` and configure the GraphQL module:
```typescript
import { Module } from '@nestjs/common';
import { GraphQLModule } from '@nestjs/graphql';
import { TypeOrmModule } from '@nestjs/typeorm';
import { join } from 'path';
import { AuthModule } from './auth/auth.module';
import { UsersModule } from './users/users.module';
@Module({
imports: [
GraphQLModule.forRoot({
autoSchemaFile: join(process.cwd(), 'src/schema.gql'),
}),
TypeOrmModule.forRoot({
type: 'mysql',
host: 'localhost',
port: 3306,
username: 'root',
password: 'password',
database: 'test',
entities: [__dirname + '/**/*.entity{.ts,.js}'],
synchronize: true,
}),
AuthModule,
UsersModule,
],
})
export class AppModule {}
```
### Step 4: Create the User Entity
1. **Create a Directory Structure**:
```bash
mkdir -p src/users src/auth
```
2. **Create the User Entity**:
Create `src/users/user.entity.ts`:
```typescript
import { Entity, PrimaryGeneratedColumn, Column } from 'typeorm';
import { ObjectType, Field, ID } from '@nestjs/graphql';
@ObjectType()
@Entity()
export class User {
@Field(() => ID)
@PrimaryGeneratedColumn()
id: number;
@Field()
@Column()
username: string;
@Field()
@Column()
email: string;
@Column()
password: string;
}
```
### Step 5: Create the User Service
1. **Implement Service Logic**:
Open `src/users/users.service.ts` and implement the service methods:
```typescript
import { Injectable } from '@nestjs/common';
import { InjectRepository } from '@nestjs/typeorm';
import { Repository } from 'typeorm';
import { User } from './user.entity';
import { CreateUserInput } from './dto/create-user.input';
import * as bcrypt from 'bcryptjs';
@Injectable()
export class UsersService {
constructor(
@InjectRepository(User)
private usersRepository: Repository<User>,
) {}
async findOneByUsername(username: string): Promise<User | undefined> {
return this.usersRepository.findOne({ username });
}
async findOneByEmail(email: string): Promise<User | undefined> {
return this.usersRepository.findOne({ email });
}
async create(createUserInput: CreateUserInput): Promise<User> {
const hashedPassword = await bcrypt.hash(createUserInput.password, 10);
const user = this.usersRepository.create({ ...createUserInput, password: hashedPassword });
return this.usersRepository.save(user);
}
}
```
### Step 6: Create the User Resolver
1. **Create the User Resolver**:
Create `src/users/users.resolver.ts`:
```typescript
import { Resolver, Mutation, Args } from '@nestjs/graphql';
import { UsersService } from './users.service';
import { User } from './user.entity';
import { CreateUserInput } from './dto/create-user.input';
@Resolver(of => User)
export class UsersResolver {
constructor(private readonly usersService: UsersService) {}
@Mutation(() => User)
async createUser(@Args('createUserInput') createUserInput: CreateUserInput): Promise<User> {
return this.usersService.create(createUserInput);
}
}
```
2. **Create DTO for User Input**:
Create `src/users/dto/create-user.input.ts`:
```typescript
import { InputType, Field } from '@nestjs/graphql';
@InputType()
export class CreateUserInput {
@Field()
username: string;
@Field()
email: string;
@Field()
password: string;
}
```
### Step 7: Create the User Module
1. **Create the User Module**:
Open `src/users/users.module.ts` and update it:
```typescript
import { Module } from '@nestjs/common';
import { TypeOrmModule } from '@nestjs/typeorm';
import { UsersService } from './users.service';
import { UsersResolver } from './users.resolver';
import { User } from './user.entity';
@Module({
imports: [TypeOrmModule.forFeature([User])],
providers: [UsersService, UsersResolver],
exports: [UsersService],
})
export class UsersModule {}
```
### Step 8: Implement Authentication
1. **Create Auth Service**:
Create `src/auth/auth.service.ts`:
```typescript
import { Injectable } from '@nestjs/common';
import { JwtService } from '@nestjs/jwt';
import { UsersService } from '../users/users.service';
import * as bcrypt from 'bcryptjs';
@Injectable()
export class AuthService {
constructor(
private usersService: UsersService,
private jwtService: JwtService,
) {}
async validateUser(username: string, pass: string): Promise<any> {
const user = await this.usersService.findOneByUsername(username);
if (user && await bcrypt.compare(pass, user.password)) {
const { password, ...result } = user;
return result;
}
return null;
}
async login(user: any) {
const payload = { username: user.username, sub: user.id };
return {
access_token: this.jwtService.sign(payload),
};
}
}
```
2. **Create Auth Module**:
Open `src/auth/auth.module.ts` and configure it:
```typescript
import { Module } from '@nestjs/common';
import { JwtModule } from '@nestjs/jwt';
import { PassportModule } from '@nestjs/passport';
import { AuthService } from './auth.service';
import { UsersModule } from '../users/users.module';
import { JwtStrategy } from './jwt.strategy';
@Module({
imports: [
UsersModule,
PassportModule,
JwtModule.register({
secret: 'secretKey', // Replace with your own secret
signOptions: { expiresIn: '60m' },
}),
],
providers: [AuthService, JwtStrategy],
exports: [AuthService],
})
export class AuthModule {}
```
3. **Create JWT Strategy**:
Create `src/auth/jwt.strategy.ts`:
```typescript
import { Injectable } from '@nestjs/common';
import { PassportStrategy } from '@nestjs/passport';
import { ExtractJwt, Strategy } from 'passport-jwt';
import { UsersService } from '../users/users.service';
@Injectable()
export class JwtStrategy extends PassportStrategy(Strategy) {
constructor(private usersService: UsersService) {
super({
jwtFromRequest: ExtractJwt.fromAuthHeaderAsBearerToken(),
ignoreExpiration: false,
secretOrKey: 'secretKey', // Replace with your own secret
});
}
async validate(payload: any) {
return { userId: payload.sub, username: payload.username };
}
}
```
### Step 9: Create Auth Resolver
1. **Create Auth Resolver**:
Create `src/auth/auth.resolver.ts`:
```typescript
import { Resolver, Query, Mutation, Args } from '@nestjs/graphql';
import { AuthService } from './auth.service';
import { AuthInput } from './dto/auth.input';
import { AuthResponse } from './dto/auth.response';
@Resolver()
export class AuthResolver {
constructor(private readonly authService: AuthService) {}
@Mutation(() => AuthResponse)
async login(@Args('authInput') authInput: AuthInput) {
const user = await this.authService.validateUser(authInput.username, authInput.password);
if (!user) {
throw new Error('Invalid credentials');
}
return this.authService.login(user);
}
}
```
2. **Create DTOs for Auth Input and Response**:
Create `src/auth/dto/auth.input.ts`:
```typescript
import { InputType, Field } from '@nestjs/graphql';
@InputType()
export class AuthInput {
@Field()
username: string;
@Field()
password: string;
}
```
Create `src/auth/dto/auth.response.ts`:
```typescript
import { ObjectType, Field } from '@nestjs/graphql';
@ObjectType()
export class AuthResponse {
@Field()
access_token: string;
}
```
### Step
10: Protect Routes with Auth Guard
1. **Create GQL Auth Guard**:
Create `src/auth/gql-auth.guard.ts`:
```typescript
import { ExecutionContext, Injectable } from '@nestjs/common';
import { AuthGuard } from '@nestjs/passport';
import { GqlExecutionContext } from '@nestjs/graphql';
@Injectable()
export class GqlAuthGuard extends AuthGuard('jwt') {
getRequest(context: ExecutionContext) {
const ctx = GqlExecutionContext.create(context);
return ctx.getContext().req;
}
}
```
2. **Apply Guard to Resolvers**:
Update `src/users/users.resolver.ts` to protect routes:
```typescript
import { UseGuards } from '@nestjs/common';
import { Resolver, Query, Mutation, Args } from '@nestjs/graphql';
import { UsersService } from './users.service';
import { User } from './user.entity';
import { CreateUserInput } from './dto/create-user.input';
import { GqlAuthGuard } from '../auth/gql-auth.guard';
@Resolver(of => User)
export class UsersResolver {
constructor(private readonly usersService: UsersService) {}
@UseGuards(GqlAuthGuard)
@Query(() => [User])
async users(): Promise<User[]> {
return this.usersService.findAll();
}
@Mutation(() => User)
async createUser(@Args('createUserInput') createUserInput: CreateUserInput): Promise<User> {
return this.usersService.create(createUserInput);
}
}
```
### Step 11: Run the Application
1. **Start the NestJS Application**:
```bash
npm run start:dev
```
### Step 12: Test the GraphQL API
1. **Access the GraphQL Playground**:
Navigate to `http://localhost:3000/graphql` to access the GraphQL playground and test your API by running queries and mutations.
### Example GraphQL Mutations and Queries
- **Create a New User**:
```graphql
mutation {
createUser(createUserInput: { username: "john", email: "john@example.com", password: "password" }) {
id
username
email
}
}
```
- **Login and Get JWT**:
```graphql
mutation {
login(authInput: { username: "john", password: "password" }) {
access_token
}
}
```
- **Query All Users (Protected)**:
```graphql
{
users {
id
username
email
}
}
```
This guide provides a foundational approach to implementing authentication and authorization in a NestJS GraphQL API. You can further expand and customize it based on your application's requirements.
Disclaimer: This content is generated by AI. | nadim_ch0wdhury | |
1,876,186 | How to Connect RESTful API & Express JS backend with MongoDB database? | Connecting a RESTful API in an Express.js backend with a MongoDB database involves several steps.... | 0 | 2024-06-04T05:33:32 | https://dev.to/nadim_ch0wdhury/how-to-connect-restful-api-express-js-backend-with-mongodb-database-2aaa | Connecting a RESTful API in an Express.js backend with a MongoDB database involves several steps. Here’s a step-by-step guide:
### Step 1: Set Up a New Express.js Project
1. **Initialize a New Project**:
```bash
mkdir project-name
cd project-name
npm init -y
```
2. **Install Required Packages**:
```bash
npm install express mongoose
npm install typescript ts-node @types/node @types/express
```
### Step 2: Configure TypeScript
1. **Create `tsconfig.json`**:
```json
{
"compilerOptions": {
"target": "ES6",
"module": "commonjs",
"strict": true,
"esModuleInterop": true,
"skipLibCheck": true,
"outDir": "./dist"
},
"include": ["src"]
}
```
### Step 3: Set Up Mongoose
1. **Create a Directory Structure**:
```bash
mkdir -p src/models src/controllers src/routes
```
### Step 4: Define the User Model
1. **Create User Model**:
Create `src/models/User.ts`:
```typescript
import { Schema, model } from 'mongoose';
const userSchema = new Schema({
name: { type: String, required: true },
email: { type: String, required: true, unique: true }
});
export const User = model('User', userSchema);
```
### Step 5: Create the User Controller
1. **Create User Controller**:
Create `src/controllers/userController.ts`:
```typescript
import { Request, Response } from 'express';
import { User } from '../models/User';
export const getUsers = async (req: Request, res: Response) => {
try {
const users = await User.find();
res.json(users);
} catch (err) {
res.status(500).send(err);
}
};
export const getUser = async (req: Request, res: Response) => {
try {
const user = await User.findById(req.params.id);
if (!user) {
return res.status(404).send('User not found');
}
res.json(user);
} catch (err) {
res.status(500).send(err);
}
};
export const createUser = async (req: Request, res: Response) => {
try {
const user = new User(req.body);
await user.save();
res.status(201).json(user);
} catch (err) {
res.status(400).send(err);
}
};
export const updateUser = async (req: Request, res: Response) => {
try {
const user = await User.findByIdAndUpdate(req.params.id, req.body, { new: true, runValidators: true });
if (!user) {
return res.status(404).send('User not found');
}
res.json(user);
} catch (err) {
res.status(400).send(err);
}
};
export const deleteUser = async (req: Request, res: Response) => {
try {
const user = await User.findByIdAndDelete(req.params.id);
if (!user) {
return res.status(404).send('User not found');
}
res.send('User deleted');
} catch (err) {
res.status(500).send(err);
}
};
```
### Step 6: Create the User Routes
1. **Create User Routes**:
Create `src/routes/userRoutes.ts`:
```typescript
import { Router } from 'express';
import { getUsers, getUser, createUser, updateUser, deleteUser } from '../controllers/userController';
const router = Router();
router.get('/users', getUsers);
router.get('/users/:id', getUser);
router.post('/users', createUser);
router.put('/users/:id', updateUser);
router.delete('/users/:id', deleteUser);
export default router;
```
### Step 7: Set Up the Express Server
1. **Create the Server**:
Create `src/index.ts`:
```typescript
import express from 'express';
import mongoose from 'mongoose';
import userRoutes from './routes/userRoutes';
const app = express();
mongoose.connect('mongodb://localhost:27017/test', {
useNewUrlParser: true,
useUnifiedTopology: true,
useFindAndModify: false,
useCreateIndex: true,
}).then(() => {
console.log('Connected to MongoDB');
}).catch(err => {
console.error('Error connecting to MongoDB', err);
});
app.use(express.json());
app.use('/api', userRoutes);
app.listen(3000, () => {
console.log('Server is running on http://localhost:3000');
});
```
### Step 8: Compile TypeScript and Run the Server
1. **Compile and Run the Server**:
```bash
npx ts-node src/index.ts
```
### Step 9: Test the RESTful API
1. **Test the API Endpoints**:
Use a tool like Postman or curl to test the RESTful API endpoints:
- `GET /api/users`: Retrieve all users.
- `GET /api/users/:id`: Retrieve a user by ID.
- `POST /api/users`: Create a new user.
- `PUT /api/users/:id`: Update a user by ID.
- `DELETE /api/users/:id`: Delete a user by ID.
This guide provides a foundational approach to creating a RESTful API in an Express.js backend connected to a MongoDB database. You can further expand and customize it based on your application's requirements.
Disclaimer: This content is generated by AI. | nadim_ch0wdhury | |
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1,864,162 | Implementing AWS Config for your Organization with CloudFormation | Objective This lab is centered on deploying AWS Config within your AWS Organization for... | 0 | 2024-06-04T05:33:07 | https://dev.to/diegop0s/aws-config-for-organizations-3i6p | aws, config, audit, security | ## Objective
This lab is centered on deploying **AWS Config** within your AWS Organization for the first time. It's advisable to familiarize yourself with essential concepts of AWS Config, AWS CloudFormation, and how they integrate with AWS Organizations if you are new to them. In case you're interested I have published a concise [summary of AWS Config in a separate post](https://dev.to/diegotrujillo/introduction-to-aws-config-544k).
I was motivated to develop this lab since I was testing some AWS Organization features and started creating multiple accounts. Subsequently, I recognized that deploying basic AWS Security Services across all accounts would be the most secure approach.
## Solution Structure
With that in mind, there are numerous options available for AWS Config. In this lab, we will utilize the following setup and components:
- (Pre-requisite) An AWS Organization must be already set up.
- We'll use AWS CloudFormation StackSets to automatically enable AWS Config on every member account. It should be noted that as per the [AWS Documentation](https://docs.aws.amazon.com/AWSCloudFormation/latest/APIReference/API_DeploymentTargets.html), the StackSet will not be deployed to the Management Account.
- As we plan to integrate AWS Config and AWS CloudFormation with AWS Organizations, we will assign the role of Delegated Administrator to one member account, thereby avoiding using the Management Account.
- We will create a single S3 Bucket within the Delegated Admin account to centralize AWS Config Log files from all member accounts.
- We will deploy a CloudFormation Stack to set up the Config StackSet and the centralized S3 Bucket.
- Once AWS Config is enabled across all accounts, we will begin establishing Organization Config Rules within the Delegated Admin account.
- Finally, a Config Aggregator will be set up in the Delegated Admin account to consolidate compliance data from all accounts and create reports.
**Accounts Structure**
## Steps
Below are the sequential steps for deploying our AWS Config solution. The complete source code is available in the [GitHub Repository](https://github.com/diegotrp/lab-awsconfig-for-orgs).
1. Assign a Delegated Administrator for AWS Config and CloudFormation.
2. Establish AWS Config Recorders using CloudFormation StackSets.
3. Implement Organization Config Rules across all accounts.
4. Set up an AWS Aggregator for cross-account reporting.
## Step 1. Assign a Delegated Administrator for AWS Config and CloudFormation.
As mentioned in AWS Documentation, run the following commands from the Management Account for enabling [AWS Config](https://docs.aws.amazon.com/config/latest/developerguide/set-up-aggregator-cli.html#register-a-delegated-administrator-cli) and [AWS CloudFormation](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/stacksets-orgs-delegated-admin.html#:~:text=To%20register%20a%20delegated%20administrator%20%28console%29%20Sign%20in,StackSets.%20Under%20Delegated%20administrators%2C%20choose%20Register%20delegated%20administrator.) for your Organization, and assigning a Delegated Admin.
- Enable service access as a delegated administrator for your organization to aggregate AWS Config data across your organization:
```
aws organizations enable-aws-service-access --service-principal=config.amazonaws.com
```
- Enable service access as a delegated administrator for your organization to deploy and manage AWS Config rules and conformance packs across your organization:
```
aws organizations enable-aws-service-access --service-principal=config-multiaccountsetup.amazonaws.com
```
- Enable service access as delegated administrator for your organization to create and manage stack sets across your organization:
```
aws organizations enable-aws-service-access --service-principal=member.org.stacksets.cloudformation.amazonaws.com
```
- To check if the enable service access is complete, enter the following command and press Enter to execute the command:
```
aws organizations list-aws-service-access-for-organization
```
You should see output similar to the following:
```
{
"EnabledServicePrincipals": [
{
"ServicePrincipal": "config-multiaccountsetup.amazonaws.com",
"DateEnabled": "2024-05-23T18:09:52.878000+00:00"
},
{
"ServicePrincipal": "config.amazonaws.com",
"DateEnabled": "2024-05-24T16:27:31.462000+00:00"
},
{
"ServicePrincipal": "member.org.stacksets.cloudformation.amazonaws.com",
"DateEnabled": "2024-05-24T16:56:08.933000+00:00"
}
]
}
```
- Next, enter the following commands to register a member account as a Delegated Admin for Config and CloudFormation:
```
aws organizations register-delegated-administrator --service-principal=config-multiaccountsetup.amazonaws.com --account-id MemberAccountID
aws organizations register-delegated-administrator --service-principal=config.amazonaws.com --account-id MemberAccountID
aws organizations register-delegated-administrator --service-principal=member.org.stacksets.cloudformation.amazonaws.com --account-id MemberAccountID
```
- To check if the registration of the delegated administrator is complete, enter the following commands:
```
aws organizations list-delegated-administrators --service-principal=config-multiaccountsetup.amazonaws.com
aws organizations list-delegated-administrators --service-principal=config.amazonaws.com
aws organizations list-delegated-administrators --service-principal=member.org.stacksets.cloudformation.amazonaws.com
```
You should see output similar to the following:
```
{
"DelegatedAdministrators": [
{
"Id": "MemberAccountID",
"Arn": "arn:aws:organizations::MemberAccountID:account/o-c7esubdi38/MemberAccountID",
"Email": "name@amazon.com",
"Name": "name",
"Status": "ACTIVE",
"JoinedMethod": "INVITED",
"JoinedTimestamp": 1604867734.48,
"DelegationEnabledDate": 1607020986.801
}
]
}
```
You can validate the following IAM Roles created on your AWS Member Accounts:
- AWSServiceRoleForConfig
- AWSServiceRoleForConfigMultiAccountSetup
- AWSServiceRoleForCloudFormationStackSetsOrgMember
## Step 2. Establish AWS Config Recorders using CloudFormation StackSets.
Before setting up Config Rules, it is necessary to begin recording resource changes, which requires the creation of a Configuration Recorder in each member account of our Organization.
There are various methods to activate AWS Config across multiple accounts; however, in this lab, we will utilize AWS CloudFormation StackSets to centrally manage Config Recorders from the Delegated Admin Account. We will also employ a Service-managed StackSet to automatically generate the required IAM Roles, prefixed with "stacksets-exec."
AWS offers various CloudFormation templates for AWS Config; however, we will utilize the template named [EnableAWSConfigForOrganizations.yml](https://cloudformation-stackset-sample-templates-us-east-1.s3.us-east-1.amazonaws.com/EnableAWSConfigForOrganizations.yml).
You can review the entire file to see all the functionalities the template supports. In this lab, we will concentrate on the following resources:
- Configuration Recorder to record all resource types (or to filter the resource types you prefer)
- Delivery Channel to send Config History and Config Snapshot files to S3, and optionally to SNS
```
ConfigRecorder:
Type: AWS::Config::ConfigurationRecorder
Properties:
RecordingGroup:
AllSupported: !Ref AllSupported
IncludeGlobalResourceTypes: !Ref IncludeGlobalResourceTypes
ResourceTypes: !If
- IsAllSupported
- !Ref AWS::NoValue
- !Ref ResourceTypes
RoleARN:
Fn::Sub:
"arn:${AWS::Partition}:iam::${AWS::AccountId}:role/aws-service-role/config.amazonaws.com/AWSServiceRoleForConfig"
ConfigDeliveryChannel:
Type: AWS::Config::DeliveryChannel
Properties:
Name: !If
- IsGeneratedDeliveryChannelName
- !Ref AWS::NoValue
- !Ref DeliveryChannelName
ConfigSnapshotDeliveryProperties: !If
- DisableSnapshots
- !Ref AWS::NoValue
- DeliveryFrequency: !FindInMap
- Settings
- FrequencyMap
- !Ref Frequency
S3BucketName: !If
- CreateBucket
- !Ref ConfigBucket
- !Ref S3BucketName
S3KeyPrefix: !If
- UsePrefix
- !Ref S3KeyPrefix
- !Ref AWS::NoValue
SnsTopicARN: !If
- UseSNS
- !If
- CreateTopic
- !Ref ConfigTopic
- !Ref TopicArn
- !Ref AWS::NoValue
```
I have developed a CloudFormation template that implements our StackSet for enabling AWS Config on all accounts, thereby automating its creation via the AWS CLI. The template includes the following functionalities:
- Creation of a new S3 Bucket exclusively for centralized AWS Config logging.
- Implementation of the StackSet across all our organization accounts, with the Delivery Channel set up to relay logs to the centralized S3 Bucket.
Please review the entire template and make any necessary modifications as needed.
```
AWSTemplateFormatVersion: 2010-09-09
Description:
This CloudFormation Stack creates a StackSet that deploys the "EnableAWSConfigForOrganizations.yml" template to an Organization, in addition to a S3 Bucket for centralized logging.
The StackSet will deploy a Stack containing the Config componentes to each member account.
Metadata:
AWS::CloudFormation::Interface:
ParameterGroups:
- Label:
default: General Parameters
Parameters:
- ConfigRegions
- TagName
- TagUnit
- TagEnvironment
- Label:
default: Centralized Bucket Parameters
Parameters:
- OrganizationId
- CentralizedBucketName
- Label:
default: Cfn StackSet Resource Parameters
Parameters:
- StackSetOuId
- StackSetAutoDeployment
- StackSetManagedExecution
- StackSetCallAsAccount
- Label:
default: Config StackSet Template Parameters
Parameters:
- StSeParAllSupported
- StSeParIncludeGlobalResourceTypes
- StSeParResourceTypes
- StSeParServiceLinkedRoleRegion
- StSeParDeliveryChannelName
- StSeParS3KeyPrefix
- StSeParFrequency
- StSeParSNS
- StSeParTopicArn
- StSeParNotificationEmail
Parameters:
ConfigRegions:
Type: List<String>
Default: us-east-1
Description: Specifies list of Regions to be configured as Deployment Target.
TagName:
Type: String
Description: Specifies the prefix for the 'Name' tag for stack resources.
TagUnit:
Type: String
Description: Specifies the value for the 'Unit' tag for stack resources.
TagEnvironment:
Type: String
Description: Specifies the value for the 'Environment' tag for stack resources.
OrganizationId:
Type: String
Default: <OrgId>
Description: Organization Id, for restricting access to centralized logging bucket.
CentralizedBucketName:
Type: String
Default: <CentrBucket>
Description: Name for Centralized Logging Bucket in Administration Account.
StackSetOuId:
Type: String
Default: <OuId>
Description: ID of Organization Unit to be configured as Deployment Target.
StackSetAutoDeployment:
Type: String
Default: true
Description: Specifies whether to enable Auto Deployment. This feature
automatically deploys StackSets to AWS Organizations accounts that are
added to a target.
AllowedValues:
- true
- false
StackSetManagedExecution:
Type: String
Default: false
Description: Describes whether StackSets performs non-conflicting operations
concurrently and queues conflicting operations.
AllowedValues:
- true
- false
StackSetCallAsAccount:
Type: String
Default: DELEGATED_ADMIN
Description:
Specifies whether you are acting as an account administrator in the
organization's management account or as a delegated administrator in a
member account.
AllowedValues:
- SELF
- DELEGATED_ADMIN
StSeParAllSupported:
Type: String
Default: true
Description:
StackSet Parameter "AllSupported" - Indicates whether to record all
supported resource types.
AllowedValues:
- true
- false
StSeParIncludeGlobalResourceTypes:
Type: String
Default: false
Description:
StackSet Parameter "IncludeGlobalResourceTypes" - Indicates whether
AWS Config records all supported global resource types.
AllowedValues:
- true
- false
StSeParResourceTypes:
Type: List<String>
Description:
StackSet Parameter "ResourceTypes" - A list of valid AWS resource
types to include in this recording group, such as AWS::EC2::Instance or
AWS::CloudTrail::Trail.
Default: <All>
StSeParServiceLinkedRoleRegion:
Type: String
Description:
StackSet Parameter "ResourceTypes" - A region such as us-east-1. If
specified, the Config service-linked role will only be created if the
stack is deployed to this region.
Default: <DeployToAnyRegion>
StSeParDeliveryChannelName:
Type: String
Default: <Generated>
Description:
StackSet Parameter "DeliveryChannelName" - The name of the delivery
channel.
StSeParS3KeyPrefix:
Type: String
Default: <Prefix>
Description:
StackSet Parameter "S3KeyPrefix" - Prefix for the specified Amazon
S3 bucket.
StSeParFrequency:
Type: String
Default: 24hours
Description: StackSet Parameter "Frequency" - The frequency with which AWS
Config delivers configuration snapshots.
AllowedValues:
- 1hour
- 3hours
- 6hours
- 12hours
- 24hours
StSeParSNS:
Type: String
Default: true
Description:
StackSet Parameter "TopicArn" - Describes wether AWS Config sends
SNS notifications.
AllowedValues:
- true
- false
StSeParTopicArn:
Type: String
Default: <New Topic>
Description:
StackSet Parameter "TopicArn" - The Amazon Resource Name (ARN) of
the Amazon Simple Notification Service (Amazon SNS) topic that AWS Config
delivers notifications to.
StSeParNotificationEmail:
Type: String
Default: <None>
Description: StackSet Parameter "NotificationEmail" - address for AWS Config
notifications (for new topics).
Resources:
CentralizedBucket:
DeletionPolicy: Retain
Type: AWS::S3::Bucket
Properties:
BucketName: !Ref CentralizedBucketName
BucketEncryption:
ServerSideEncryptionConfiguration:
- ServerSideEncryptionByDefault:
SSEAlgorithm: AES256
Tags:
- Key: Name
Value: !Sub
- "${tag}-${bucket}"
- tag: !Ref TagName
bucket: !Ref CentralizedBucketName
- Key: Unit
Value: !Ref TagUnit
- Key: Environment
Value: !Ref TagEnvironment
CentralizedBucketPolicy:
Type: AWS::S3::BucketPolicy
Properties:
Bucket: !Ref CentralizedBucket
PolicyDocument:
Version: 2012-10-17
Statement:
- Sid: AWSConfigBucketPermissionsCheck
Effect: Allow
Principal:
Service:
- config.amazonaws.com
Action: s3:GetBucketAcl
Resource:
- !Sub arn:${AWS::Partition}:s3:::${CentralizedBucket}
Condition:
StringEquals:
aws:SourceOrgID: !Ref OrganizationId
- Sid: AWSConfigBucketExistenceCheck
Effect: Allow
Principal:
Service:
- config.amazonaws.com
Action: s3:ListBucket
Resource:
- !Sub arn:${AWS::Partition}:s3:::${CentralizedBucket}
Condition:
StringEquals:
aws:SourceOrgID: !Ref OrganizationId
- Sid: AWSConfigBucketDelivery
Effect: Allow
Principal:
Service:
- config.amazonaws.com
Action: s3:PutObject
Resource:
- !Sub arn:${AWS::Partition}:s3:::${CentralizedBucket}/${StSeParS3KeyPrefix}/AWSLogs/*
Condition:
StringEquals:
aws:SourceOrgID: !Ref OrganizationId
ConfigStackSet:
Type: AWS::CloudFormation::StackSet
Properties:
StackSetName: ConfigStackSet
Description: StackSet for deploying AWS Config to an Organization Unit
PermissionModel: SERVICE_MANAGED
Capabilities:
- CAPABILITY_IAM
ManagedExecution:
Active: !Ref StackSetManagedExecution
OperationPreferences:
FailureToleranceCount: 0
MaxConcurrentCount: 1
RegionConcurrencyType: SEQUENTIAL
StackInstancesGroup:
- DeploymentTargets:
OrganizationalUnitIds:
- !Ref StackSetOuId
Regions: !Ref ConfigRegions
CallAs: !Ref StackSetCallAsAccount
AutoDeployment:
Enabled: !Ref StackSetAutoDeployment
RetainStacksOnAccountRemoval: true
Parameters:
- ParameterKey: AllSupported
ParameterValue: !Ref StSeParAllSupported
- ParameterKey: IncludeGlobalResourceTypes
ParameterValue: !Ref StSeParIncludeGlobalResourceTypes
- ParameterKey: ResourceTypes
ParameterValue: !Join
- ","
- !Ref StSeParResourceTypes
- ParameterKey: ServiceLinkedRoleRegion
ParameterValue: !Ref StSeParServiceLinkedRoleRegion
- ParameterKey: DeliveryChannelName
ParameterValue: !Ref StSeParDeliveryChannelName
- ParameterKey: S3BucketName
ParameterValue: !Ref CentralizedBucket
- ParameterKey: S3KeyPrefix
ParameterValue: !Ref StSeParS3KeyPrefix
- ParameterKey: Frequency
ParameterValue: !Ref StSeParFrequency
- ParameterKey: SNS
ParameterValue: !Ref StSeParSNS
- ParameterKey: TopicArn
ParameterValue: !Ref StSeParTopicArn
- ParameterKey: NotificationEmail
ParameterValue: !Ref StSeParNotificationEmail
TemplateURL: https://cloudformation-stackset-sample-templates-us-east-1.s3.us-east-1.amazonaws.com/EnableAWSConfigForOrganizations.yml
Tags:
- Key: Name
Value: !Sub
- "${tag}-StackSet"
- tag: !Ref TagName
- Key: Unit
Value: !Ref TagUnit
- Key: Environment
Value: !Ref TagEnvironment
```
Upload the template to an S3 Bucket, and then execute the following command, replacing the necessary values.
```
aws cloudformation create-stack --stack-name Config-StackSetConfigRecorder \
--template-url https://xxxxxxxx-templates.s3.amazonaws.com/2-StackSetConfigOrg.yml \
--parameters \
ParameterKey=ConfigRegions,ParameterValue=us-east-1 \
ParameterKey=TagName,ParameterValue=Config-StackSetConfigRecorder \
ParameterKey=TagUnit,ParameterValue=Security \
ParameterKey=TagEnvironment,ParameterValue=Prod \
ParameterKey=OrganizationId,ParameterValue=o-xxxxxxx \
ParameterKey=CentralizedBucketName,ParameterValue=centralized-aaa-bbb-c \
ParameterKey=StackSetOuId,ParameterValue=r-xxxx \
ParameterKey=StackSetAutoDeployment,ParameterValue=true \
ParameterKey=StackSetManagedExecution,ParameterValue=false \
ParameterKey=StackSetCallAsAccount,ParameterValue=DELEGATED_ADMIN \
ParameterKey=StSeParAllSupported,ParameterValue=true \
ParameterKey=StSeParIncludeGlobalResourceTypes,ParameterValue=false \
ParameterKey=StSeParResourceTypes,ParameterValue="<All>" \
ParameterKey=StSeParServiceLinkedRoleRegion,ParameterValue="<DeployToAnyRegion>" \
ParameterKey=StSeParDeliveryChannelName,ParameterValue="<Generated>" \
ParameterKey=StSeParS3KeyPrefix,ParameterValue=o-xxxxxxx \
ParameterKey=StSeParFrequency,ParameterValue=24hours \
ParameterKey=StSeParSNS,ParameterValue=false \
ParameterKey=StSeParTopicArn,ParameterValue="<New Topic>" \
ParameterKey=StSeParNotificationEmail,ParameterValue="<None>"
```
Following the successful creation of the Stack, you may proceed to verify the establishment of the following resources:
_CloudFormation Stack in Delegated Admin account_
_S3 Bucket in Delegated Admin account_
_CloudFormation StackSet in Delegated Admin account_
_CloudFormation Stacks in Member Accounts_
_IAM Role for Service-managed StackSet in Member Accounts_
_AWS Config enabled in Member Accounts_
## Step 3. Implement Organization Config Rules across all accounts.
Next, we will deploy a few Organization Config Rules. You can explore all the available [Managed Rules](https://docs.aws.amazon.com/config/latest/developerguide/managed-rules-by-aws-config.html) or create your Custom Rules. For this lab, we will use the ACCESS_KEYS_ROTATED and REQUIRED_TAGS rules to fit my use case.
It should be noted that Organization Config Rules are automatically deployed to the Management Account. However, during Step 2, when the StackSet was deployed to activate Config, it did not include the Management Account. Therefore, if you wish to set up Config for the Management Account, you must first manually activate Config and then establish the necessary Service-Linked accounts using these commands:
```
aws iam create-service-linked-role --aws-service-name config.amazonaws.com
aws iam create-service-linked-role --aws-service-name config-multiaccountsetup.amazonaws.com
```
For simplicity, we will not deploy Config Rules to the Management Account. Therefore, we will include an additional parameter "ExcludedAccounts" with the Management account ID as its value to prevent the creation of Config Rules in that account.
Please review the following template and make any necessary modifications as needed.
```
AWSTemplateFormatVersion: 2010-09-09
Description: This CloudFormation Stack creates a StackSet that deploys a group of Organization Config Rules.
Metadata:
AWS::CloudFormation::Interface:
ParameterGroups:
- Label:
default: Organization Config Rules Parameters
Parameters:
- OrgRulePrefixName
Parameters:
OrgRulePrefixName:
Type: String
Default: <OrgRulePrefix>
Description: Prefix for the name of the Organization Config Rules.
OrgRuleExcludedAccounts:
Type: List<String>
Default: <OrgRuleExcludedAccounts>
Description: List of excluded accounts for the Organization Config Rules.
Resources:
ConfigOrgRuleRequiredTags:
Type: AWS::Config::OrganizationConfigRule
Properties:
OrganizationConfigRuleName: !Sub
- "${prefix}-requiredtags"
- prefix: !Ref OrgRulePrefixName
ExcludedAccounts: !Ref OrgRuleExcludedAccounts
OrganizationManagedRuleMetadata:
RuleIdentifier: REQUIRED_TAGS
Description: Checks if your resources have the standard tags.
InputParameters: !Sub '{"tag1Key":"Name", "tag2Key":"Unit", "tag2Value":"Management,Security,Applications", "tag3Key":"Environment", "tag3Value": "Prod,Dev,Test,Sandbox"}'
ConfigOrgRuleAccessKeysRotated:
Type: AWS::Config::OrganizationConfigRule
Properties:
OrganizationConfigRuleName: !Sub
- "${prefix}-accesskeysrotation"
- prefix: !Ref OrgRulePrefixName
ExcludedAccounts: !Ref OrgRuleExcludedAccounts
OrganizationManagedRuleMetadata:
RuleIdentifier: ACCESS_KEYS_ROTATED
Description: Checks if active IAM access keys are rotated within 90 days.
InputParameters: !Sub '{"maxAccessKeyAge": "90"}'
MaximumExecutionFrequency: TwentyFour_Hours
```
Upload the new template to S3 and run the following command for creating the stack.
```
aws cloudformation create-stack --stack-name Config-OrgConfigRules \
--template-url https://xxxxxxxx-templates.s3.amazonaws.com/3-StackSetConfigRules.yml \
--parameters \
ParameterKey=TagName,ParameterValue=Config-StackSetConfigRecorder \
ParameterKey=TagUnit,ParameterValue=Security \
ParameterKey=TagEnvironment,ParameterValue=Prod \
ParameterKey=OrgRulePrefixName,ParameterValue="compliance" \
ParameterKey=OrgRuleExcludedAccounts,ParameterValue="XXXXXXXXXXXXX"
```
After successfully creating the Stack, you can confirm the establishment of the Config Rules in the Member Accounts:
_List Organization Config Rules using the CLI_
```
aws configservice describe-organization-config-rules
```
_List Organization Config Rules using the Console_
## Step 4. Set up an AWS Aggregator for cross-account reporting.
Now that we've implemented some Config Rules, it's necessary to have a straightforward method to monitor compliance across all accounts, which is why we are proceeding to establish our Config Aggregator.
We will create a final stack to deploy the Config Aggregator, along with a new IAM Role that the Aggregator needs to gather data from all accounts within an organization.
Please review the following template and make any necessary modifications as needed.
```
AWSTemplateFormatVersion: 2010-09-09
Description: This CloudFormation Stack creates a StackSet that deploys the
"EnableAWSConfig.yml" template to an Organization
Metadata:
AWS::CloudFormation::Interface:
ParameterGroups:
- Label:
default: General Parameters
Parameters:
- ConfigRegions
- TagName
- TagUnit
- TagEnvironment
- Label:
default: Aggregator Parameters
Parameters:
- ConfigAggRoleName
- ConfigAggName
Parameters:
ConfigRegions:
Type: List<String>
Default: us-east-1
Description: Specifies list of Regions to be configured as Deployment Target.
TagName:
Type: String
Description: Specifies the prefix for the 'Name' tag for stack resources.
TagUnit:
Type: String
Description: Specifies the value for the 'Unit' tag for stack resources.
TagEnvironment:
Type: String
Description: Specifies the value for the 'Environment' tag for stack resources.
ConfigAggRoleName:
Type: String
Default: <AggregatorRoleName>
Description: Name for Config Aggregator IAM Role.
ConfigAggName:
Type: String
Default: <AggregatorName>
Description: Name for Config Aggregator.
Resources:
ConfigAggregatorRole:
Type: AWS::IAM::Role
Properties:
RoleName: !Ref ConfigAggRoleName
Description: Role for organizational AWS Config aggregator
AssumeRolePolicyDocument:
Version: 2012-10-17
Statement:
- Effect: Allow
Principal:
Service: config.amazonaws.com
Action: sts:AssumeRole
Path: /
ManagedPolicyArns:
- arn:aws:iam::aws:policy/service-role/AWSConfigRoleForOrganizations
Tags:
- Key: Name
Value: !Sub
- "${tag}-${rolename}"
- tag: !Ref TagName
rolename: !Ref ConfigAggRoleName
- Key: Unit
Value: !Ref TagUnit
- Key: Environment
Value: !Ref TagEnvironment
ConfigAggregator:
Type: AWS::Config::ConfigurationAggregator
Properties:
ConfigurationAggregatorName: !Ref ConfigAggName
OrganizationAggregationSource:
AllAwsRegions: false
AwsRegions: !Ref ConfigRegions
RoleArn: !GetAtt ConfigAggregatorRole.Arn
Tags:
- Key: Name
Value: !Sub
- "${tag}-${agg}"
- tag: !Ref TagName
agg: !Ref ConfigAggName
- Key: Unit
Value: !Ref TagUnit
- Key: Environment
Value: !Ref TagEnvironment
```
Upload the new template to S3 and run the following command to create the stack.
```
aws cloudformation create-stack --stack-name Config-OrgConfigAggregator \
--template-url https://xxxxxxxx-templates.s3.amazonaws.com/4-StackSetConfigAgg.yml \
--capabilities CAPABILITY_NAMED_IAM \
--parameters \
ParameterKey=ConfigRegions,ParameterValue=us-east-1 \
ParameterKey=TagName,ParameterValue=Config-StackSetConfigRecorder \
ParameterKey=TagUnit,ParameterValue=Security \
ParameterKey=TagEnvironment,ParameterValue=Prod \
ParameterKey=ConfigAggRoleName,ParameterValue="ConfigAggregatorRole" \
ParameterKey=ConfigAggName,ParameterValue="aggregator"
```
Once the command is executed successfully, an 'OK' status will appear on the aggregator page. However, the aggregator dashboard may take a while to reflect the data from all accounts.
You can execute a query in the Console utilizing data from all accounts and examine all the available fields. To view data from all S3 buckets, run the following query.
```
SELECT
resourceId,
resourceName,
resourceCreationTime,
accountId
WHERE
resourceType = 'AWS::S3::Bucket'
```
## Cleanup
This lab outlined enabling AWS Config using the AWS CLI to easily replicate each setting. It's important to remember to clean up all CloudFormation stacks and any IAM Role created by AWS.
## Further steps
If you're interested in further exploring AWS Config features and enhancing your setup, consider these suggestions:
- Implement Conformance Packs to utilize a single template that establishes Config Rules across all accounts, avoiding the constraints of Organization Config Rules that necessitate individual rule definition.
- Extend the scope of AWS Config to a multi-region setting within AWS Organizations.
- Introduce server-side encryption for the Centralized S3 Bucket using KMS, which will entail adding IAM Policies to numerous IAM Roles.
- Experiment with AWS Control Tower, a service that simplifies many of the manual configurations associated with AWS Config.
- Implement SNS Notifications for the Config Delivery channel to centralize all messages into one account.
---
## Additional resources
- [AWS Config: Setting Up an Aggregator Using the AWS Command Line Interface](https://docs.aws.amazon.com/config/latest/developerguide/set-up-aggregator-cli.html#add-an-aggregator-organization-cli)
- [Using delegated admin for AWS Config operations and aggregation](https://aws.amazon.com/blogs/mt/using-delegated-admin-for-aws-config-operations-and-aggregation/)
- [AWS CloudFormation: Working with AWS CloudFormation StackSets](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/what-is-cfnstacksets.html)
- [AWS CloudFormation: StackSets concepts](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/stacksets-concepts.html)
| diegop0s |
1,876,184 | How to Connect GraphQL API & Express JS backend with MySQL/PgSQL database? | Connecting a GraphQL API in an Express.js backend with a MySQL or PostgreSQL database involves... | 0 | 2024-06-04T05:31:54 | https://dev.to/nadim_ch0wdhury/how-to-connect-graphql-api-express-js-backend-with-mysqlpgsql-databse-1dlc | Connecting a GraphQL API in an Express.js backend with a MySQL or PostgreSQL database involves several steps. Here’s a step-by-step guide for both databases:
### Step 1: Set Up a New Express.js Project
1. **Initialize a New Project**:
```bash
mkdir project-name
cd project-name
npm init -y
```
2. **Install Required Packages**:
```bash
npm install express express-graphql graphql
npm install typeorm reflect-metadata mysql2 pg
npm install type-graphql class-validator
```
### Step 2: Configure TypeORM
1. **Create a `ormconfig.json` File**:
For MySQL:
```json
{
"type": "mysql",
"host": "localhost",
"port": 3306,
"username": "root",
"password": "password",
"database": "test",
"synchronize": true,
"logging": false,
"entities": [
"src/entity/**/*.ts"
]
}
```
For PostgreSQL:
```json
{
"type": "postgres",
"host": "localhost",
"port": 5432,
"username": "user",
"password": "password",
"database": "test",
"synchronize": true,
"logging": false,
"entities": [
"src/entity/**/*.ts"
]
}
```
### Step 3: Define the User Entity
1. **Create a Directory Structure**:
```bash
mkdir -p src/entity src/resolvers
```
2. **Create the User Entity**:
Create `src/entity/User.ts`:
```typescript
import { Entity, PrimaryGeneratedColumn, Column } from 'typeorm';
import { ObjectType, Field, ID } from 'type-graphql';
@ObjectType()
@Entity()
export class User {
@Field(() => ID)
@PrimaryGeneratedColumn()
id: number;
@Field()
@Column()
name: string;
@Field()
@Column()
email: string;
}
```
### Step 4: Create the User Resolver
1. **Create the User Resolver**:
Create `src/resolvers/UserResolver.ts`:
```typescript
import { Resolver, Query, Mutation, Arg } from 'type-graphql';
import { User } from '../entity/User';
import { getRepository } from 'typeorm';
@Resolver()
export class UserResolver {
private userRepository = getRepository(User);
@Query(() => [User])
async users() {
return this.userRepository.find();
}
@Mutation(() => User)
async createUser(@Arg('name') name: string, @Arg('email') email: string) {
const user = this.userRepository.create({ name, email });
return this.userRepository.save(user);
}
}
```
### Step 5: Set Up the Express.js Server
1. **Create the Server**:
Create `src/index.ts`:
```typescript
import 'reflect-metadata';
import { createConnection } from 'typeorm';
import express from 'express';
import { graphqlHTTP } from 'express-graphql';
import { buildSchema } from 'type-graphql';
import { UserResolver } from './resolvers/UserResolver';
async function bootstrap() {
await createConnection();
const schema = await buildSchema({
resolvers: [UserResolver],
});
const app = express();
app.use(
'/graphql',
graphqlHTTP({
schema,
graphiql: true,
}),
);
app.listen(4000, () => {
console.log('Server is running on http://localhost:4000/graphql');
});
}
bootstrap();
```
### Step 6: Compile TypeScript and Run the Server
1. **Install TypeScript and ts-node**:
```bash
npm install typescript ts-node @types/node @types/express
```
2. **Add TypeScript Configuration**:
Create `tsconfig.json`:
```json
{
"compilerOptions": {
"target": "ES6",
"module": "commonjs",
"strict": true,
"esModuleInterop": true,
"skipLibCheck": true,
"outDir": "./dist"
},
"include": ["src"]
}
```
3. **Compile and Run the Server**:
```bash
npx ts-node src/index.ts
```
### Step 7: Test the GraphQL API
1. **Access the GraphQL Playground**:
Navigate to `http://localhost:4000/graphql` to access the GraphQL playground and test your API by running queries and mutations.
### Example GraphQL Queries and Mutations
- **Query All Users**:
```graphql
{
users {
id
name
email
}
}
```
- **Create a New User**:
```graphql
mutation {
createUser(name: "John Doe", email: "john.doe@example.com") {
id
name
email
}
}
```
This guide provides a foundational approach to creating a GraphQL API in an Express.js backend connected to a MySQL or PostgreSQL database. You can further expand and customize it based on your application's requirements.
Disclaimer: This content is generated by AI. | nadim_ch0wdhury | |
1,876,182 | Using DAX for Financial Analysis in Power BI | Introduction Power BI, Microsoft's powerful data visualization tool, has revolutionized how... | 0 | 2024-06-04T05:28:16 | https://dev.to/stevejacob45678/using-dax-for-financial-analysis-in-power-bi-240h | powerbi, powerbiconsulting, powerbidax | Introduction
Power BI, Microsoft's powerful data visualization tool, has revolutionized how businesses analyze and interpret their data. One of its standout features is the use of Data Analysis Expressions (DAX), a robust formula language that enhances Power BI’s data manipulation capabilities. This blog explores how DAX can be leveraged for financial analysis, transforming raw data into insightful, actionable metrics.
What is DAX?
DAX, or Data Analysis Expressions, is a collection of functions, operators, and constants used in Power BI, Excel, and SQL Server Analysis Services to perform advanced data calculations and queries. DAX formulas are similar to Excel formulas but designed to work with relational data and perform more complex calculations.
Key DAX Functions for Financial Analysis
1. SUM() and SUMX()
- SUM(): Adds all the numbers in a column. For example, calculating total sales.
DAX
TotalSales = SUM(Sales[Amount])
- SUMX(): Adds an expression evaluated for each row in a table. Useful for weighted averages or dynamic calculations.
```DAX
TotalWeightedSales = SUMX(Sales, Sales[Quantity] Sales[Price])
```
2. AVERAGE() and AVERAGEX()
- AVERAGE(): Computes the mean of a column.
```DAX
AverageSales = AVERAGE(Sales[Amount])
```
- AVERAGEX(): Computes the mean of an expression evaluated for each row.
```DAX
AveragePrice = AVERAGEX(Sales, Sales[Amount] / Sales[Quantity])
```
3. CALCULATE()
- Modifies the context in which data is evaluated, allowing for dynamic filtering.
```DAX
SalesLastYear = CALCULATE(SUM(Sales[Amount]), Sales[Year] = YEAR(TODAY()) - 1)
```
4. DATEADD(), DATESYTD(), and DATESQTD()
- DATEADD(): Shifts dates by a specified interval, useful for comparing periods.
```DAX
SalesLastQuarter = CALCULATE(SUM(Sales[Amount]), DATEADD(Calendar[Date], -1, QUARTER))
```
- DATESYTD(): Calculates the year-to-date total.
```DAX
SalesYTD = CALCULATE(SUM(Sales[Amount]), DATESYTD(Calendar[Date]))
```
- DATESQTD(): Calculates the quarter-to-date total.
```DAX
SalesQTD = CALCULATE(SUM(Sales[Amount]), DATESQTD(Calendar[Date]))
```
5. RELATED()
- Retrieves related values from another table, crucial for working with normalized data.
```DAX
TotalSalesByRegion = SUMX(Sales, Sales[Amount] RELATED(Region[Multiplier]))
```
Practical Examples of DAX in Financial Dashboards
1. Revenue Growth Analysis
- Calculate year-over-year (YoY) growth.
```DAX
YoYGrowth =
DIVIDE(
SUM(Sales[Amount]) - CALCULATE(SUM(Sales[Amount]), DATEADD(Calendar[Date], -1, YEAR)),
CALCULATE(SUM(Sales[Amount]), DATEADD(Calendar[Date], -1, YEAR))
)
```
2. Profit Margin Calculation
- Determine the profit margin percentage.
```DAX
ProfitMargin = DIVIDE(SUM(Sales[Profit]), SUM(Sales[Revenue]))
```
3. Dynamic Segmentation
- Segment customers based on their purchasing behavior.
```DAX
HighValueCustomers =
CALCULATE(
[TotalSales],
FILTER(
Customers,
Customers[TotalPurchases] > 10000
)
)
```
Best Practices for Using DAX in Financial Analysis
1. Understand Context
- Master row context and filter context to write efficient and accurate DAX formulas. Context influences how data is filtered and aggregated, affecting the results of your calculations.
2. Use Variables
- Simplify complex DAX formulas and improve readability by using variables.
```DAX
YoYGrowth =
VAR CurrentYearSales = SUM(Sales[Amount])
VAR PreviousYearSales = CALCULATE(SUM(Sales[Amount]), DATEADD(Calendar[Date], -1, YEAR))
RETURN
DIVIDE(CurrentYearSales - PreviousYearSales, PreviousYearSales)
```
3. Optimize Performance
- Use measures instead of calculated columns whenever possible to enhance performance and flexibility. Measures are dynamic and calculated on the fly, reducing the data model's size.
4. Leverage Time Intelligence Functions
- Utilize built-in time intelligence functions to simplify date-related calculations, ensuring consistency and accuracy in period-over-period analyses.
Conclusion
DAX is a powerful tool for financial analysis in Power BI, enabling complex calculations and insightful data visualizations. By mastering key DAX functions and best practices, financial analysts can unlock the full potential of their data, driving better business decisions and strategic planning. Start experimenting with DAX in your **[Power BI financial dashboards](https://www.itpathsolutions.com/build-an-interactive-financial-dashboard-with-power-bi/)** today and see how it transforms your financial reporting.
Feel free to leave a comment or question below if you have any specific DAX queries or need further assistance with your Power BI projects!
| stevejacob45678 |
1,876,181 | How to connect RESTful API & Nest JS backend with MongoDB database? | Connecting a RESTful API in a NestJS backend with a MongoDB database involves several steps. Here’s a... | 0 | 2024-06-04T05:28:01 | https://dev.to/nadim_ch0wdhury/how-to-connect-restful-api-nest-js-backend-with-mongodb-database-1g6i | Connecting a RESTful API in a NestJS backend with a MongoDB database involves several steps. Here’s a step-by-step guide:
### Step 1: Setup a New NestJS Project
1. **Install Nest CLI**:
```bash
npm install -g @nestjs/cli
```
2. **Create a New Project**:
```bash
nest new project-name
```
3. **Navigate to the Project Directory**:
```bash
cd project-name
```
### Step 2: Install Required Packages
1. **Install Mongoose Package**:
```bash
npm install @nestjs/mongoose mongoose
```
### Step 3: Configure Mongoose
1. **Create a Mongoose Module Configuration**:
Open `src/app.module.ts` and configure the Mongoose module:
```typescript
import { Module } from '@nestjs/common';
import { MongooseModule } from '@nestjs/mongoose';
import { UserModule } from './user/user.module';
@Module({
imports: [
MongooseModule.forRoot('mongodb://localhost/nest'),
UserModule,
],
})
export class AppModule {}
```
### Step 4: Define the User Schema and DTO
1. **Create a User Schema**:
Create the `src/user/schemas/user.schema.ts` file:
```typescript
import { Schema } from 'mongoose';
export const UserSchema = new Schema({
name: String,
email: String,
});
```
2. **Create a User DTO**:
Create the `src/user/dto/create-user.dto.ts` file:
```typescript
export class CreateUserDto {
readonly name: string;
readonly email: string;
}
```
### Step 5: Create the User Service
1. **Implement Service Logic**:
Open `src/user/user.service.ts` and implement the service methods:
```typescript
import { Injectable } from '@nestjs/common';
import { InjectModel } from '@nestjs/mongoose';
import { Model } from 'mongoose';
import { User } from './interfaces/user.interface';
import { CreateUserDto } from './dto/create-user.dto';
@Injectable()
export class UserService {
constructor(@InjectModel('User') private readonly userModel: Model<User>) {}
async findAll(): Promise<User[]> {
return this.userModel.find().exec();
}
async findOne(id: string): Promise<User> {
return this.userModel.findById(id).exec();
}
async create(createUserDto: CreateUserDto): Promise<User> {
const createdUser = new this.userModel(createUserDto);
return createdUser.save();
}
async update(id: string, updateUserDto: CreateUserDto): Promise<User> {
return this.userModel.findByIdAndUpdate(id, updateUserDto, { new: true }).exec();
}
async delete(id: string): Promise<User> {
return this.userModel.findByIdAndRemove(id).exec();
}
}
```
### Step 6: Create the User Controller
1. **Implement Controller Logic**:
Open `src/user/user.controller.ts` and define the routes:
```typescript
import { Controller, Get, Post, Put, Delete, Param, Body } from '@nestjs/common';
import { UserService } from './user.service';
import { CreateUserDto } from './dto/create-user.dto';
import { User } from './interfaces/user.interface';
@Controller('users')
export class UserController {
constructor(private readonly userService: UserService) {}
@Get()
async findAll(): Promise<User[]> {
return this.userService.findAll();
}
@Get(':id')
async findOne(@Param('id') id: string): Promise<User> {
return this.userService.findOne(id);
}
@Post()
async create(@Body() createUserDto: CreateUserDto): Promise<User> {
return this.userService.create(createUserDto);
}
@Put(':id')
async update(@Param('id') id: string, @Body() updateUserDto: CreateUserDto): Promise<User> {
return this.userService.update(id, updateUserDto);
}
@Delete(':id')
async delete(@Param('id') id: string): Promise<User> {
return this.userService.delete(id);
}
}
```
### Step 7: Create the User Interface
1. **Create a User Interface**:
Create the `src/user/interfaces/user.interface.ts` file:
```typescript
import { Document } from 'mongoose';
export interface User extends Document {
readonly name: string;
readonly email: string;
}
```
### Step 8: Update the User Module
1. **Update the User Module**:
Open `src/user/user.module.ts` and update it to include the controller, service, and schema:
```typescript
import { Module } from '@nestjs/common';
import { MongooseModule } from '@nestjs/mongoose';
import { UserController } from './user.controller';
import { UserService } from './user.service';
import { UserSchema } from './schemas/user.schema';
@Module({
imports: [MongooseModule.forFeature([{ name: 'User', schema: UserSchema }])],
controllers: [UserController],
providers: [UserService],
})
export class UserModule {}
```
### Step 9: Run the Application
1. **Start the NestJS Application**:
```bash
npm run start:dev
```
### Step 10: Test the RESTful API
1. **Test the API Endpoints**:
Use a tool like Postman or curl to test the RESTful API endpoints:
- `GET /users`: Retrieve all users.
- `GET /users/:id`: Retrieve a user by ID.
- `POST /users`: Create a new user.
- `PUT /users/:id`: Update a user by ID.
- `DELETE /users/:id`: Delete a user by ID.
This guide provides a foundational approach to creating a RESTful API in NestJS connected to a MongoDB database. You can further expand and customize it based on your application's requirements.
Disclaimer: This content is generated by AI. | nadim_ch0wdhury | |
1,876,180 | Hello, world! | Programming is fun! Isn't it? Anyone interested in logic with some creativity will fall in love with... | 27,589 | 2024-06-04T05:27:57 | https://dev.to/afraazahmed/hello-world-7bc | python, programming, beginners, tutorial | _Programming is fun!_
Isn't it?
Anyone interested in logic with some creativity will fall in love with coding.
Alright then, if you are interested to start the journey with me in learning a programming language: let's start our first step in learning to code.
OK, but there so many coding languages in the world, right?
Which one to choose?
Now, calm down. I am here to help you with providing some top choices by any beginner in this field:
- C++
- Java
- Python
OK, which one did you find easy?
I bet that it's Python!
Well then, welcome to the Python community!
Let's start this journey of programming with gaining some knowledge on Python programming language.
Python is a powerful general-purpose programming language.
It is created by Guido van Rossum.
Python is easy to learn and easy to code.
**Python Installation**
Check out the following guidelines for getting python installed in your computer
[W3Schools](https://www.w3schools.com/python/python_getstarted.asp)
[Youtube](https://www.youtube.com/watch?v=mbryl4MZJms)
## Best Resources
- [Learn more about Python Programming Language](https://dev.to/afraazahmed/python-programming-a-beginners-guide-1hig)
- [Python Blog Series](https://dev.to/afraazahmed/series/27589) : A Blog series where I will be learning and sharing my knowledge on each of the above topics.
- [Learn Python for Free, Get Hired, and (maybe) Change the World!](https://zerotomastery.io/blog/best-way-to-learn-python-for-free) : A detailed roadmap blog by Jayson Lennon (a Senior Software Engineer) with links to free resources.
- **Zero To Mastery Course** - [Complete Python Developer](https://zerotomastery.io/courses/learn-python/) : A comprehensive course by Andrei Neagoie (a Senior Developer) that covers all of the above topics.
**Who Am I?**
I’m Afraaz Ahmed, a Software Engineering Nerd who loves building Web Applications, now sharing my knowledge through Blogging during the busy time of my freelancing work life. Here’s the link to all of my socials categorized by platforms under one place: https://linktr.ee/afraazahmed
**Thank you** so much for reading my blog🙂. | afraazahmed |
1,876,179 | How to connect GraphQL API & Nest JS backend with MySQL/PgSQL database? | Connecting a GraphQL NestJS backend with MySQL and PostgreSQL databases involves several steps.... | 0 | 2024-06-04T05:25:31 | https://dev.to/nadim_ch0wdhury/how-to-connect-graphql-api-nest-js-backend-with-mysqlpgsql-database-1361 | Connecting a GraphQL NestJS backend with MySQL and PostgreSQL databases involves several steps. Here’s a step-by-step guide for both databases:
### Step 1: Setup a New NestJS Project
1. **Install Nest CLI**:
```bash
npm install -g @nestjs/cli
```
2. **Create a New Project**:
```bash
nest new project-name
```
3. **Navigate to the Project Directory**:
```bash
cd project-name
```
### Step 2: Install Required Packages
1. **Install TypeORM and GraphQL Packages**:
```bash
npm install @nestjs/typeorm typeorm @nestjs/graphql graphql apollo-server-express
```
2. **Install Database Drivers**:
For MySQL:
```bash
npm install mysql2
```
For PostgreSQL:
```bash
npm install pg
```
### Step 3: Configure TypeORM and GraphQL
1. **Create a GraphQL Module Configuration**:
Open `src/app.module.ts` and configure the GraphQL module:
```typescript
import { Module } from '@nestjs/common';
import { TypeOrmModule } from '@nestjs/typeorm';
import { GraphQLModule } from '@nestjs/graphql';
import { join } from 'path';
import { UserModule } from './user/user.module';
@Module({
imports: [
TypeOrmModule.forRoot({
type: 'mysql', // or 'postgres'
host: 'localhost',
port: 3306, // or 5432 for PostgreSQL
username: 'root', // or your PostgreSQL username
password: 'password', // or your PostgreSQL password
database: 'test',
entities: [__dirname + '/**/*.entity{.ts,.js}'],
synchronize: true,
}),
GraphQLModule.forRoot({
autoSchemaFile: join(process.cwd(), 'src/schema.gql'),
}),
UserModule,
],
})
export class AppModule {}
```
### Step 4: Define the User Entity
1. **Create a User Entity**:
Create the `src/user/user.entity.ts` file:
```typescript
import { Entity, Column, PrimaryGeneratedColumn } from 'typeorm';
import { ObjectType, Field, Int } from '@nestjs/graphql';
@ObjectType()
@Entity()
export class User {
@Field(type => Int)
@PrimaryGeneratedColumn()
id: number;
@Field()
@Column()
name: string;
@Field()
@Column()
email: string;
}
```
### Step 5: Create the User Service
1. **Implement Service Logic**:
Open `src/user/user.service.ts` and implement the service methods:
```typescript
import { Injectable } from '@nestjs/common';
import { InjectRepository } from '@nestjs/typeorm';
import { Repository } from 'typeorm';
import { User } from './user.entity';
@Injectable()
export class UserService {
constructor(
@InjectRepository(User)
private usersRepository: Repository<User>,
) {}
findAll(): Promise<User[]> {
return this.usersRepository.find();
}
findOne(id: number): Promise<User> {
return this.usersRepository.findOneBy({ id });
}
create(user: Partial<User>): Promise<User> {
return this.usersRepository.save(user);
}
async update(id: number, user: Partial<User>): Promise<User> {
await this.usersRepository.update(id, user);
return this.usersRepository.findOneBy({ id });
}
async delete(id: number): Promise<void> {
await this.usersRepository.delete(id);
}
}
```
### Step 6: Create the User Resolver
1. **Generate a Resolver**:
Use the Nest CLI to generate a resolver:
```bash
nest g resolver user
```
2. **Define Resolver Logic**:
Open `src/user/user.resolver.ts` and define the resolver logic:
```typescript
import { Resolver, Query, Mutation, Args, Int } from '@nestjs/graphql';
import { UserService } from './user.service';
import { User } from './user.entity';
import { CreateUserInput } from './dto/create-user.input';
@Resolver(of => User)
export class UserResolver {
constructor(private readonly userService: UserService) {}
@Query(returns => [User])
users() {
return this.userService.findAll();
}
@Query(returns => User)
user(@Args('id', { type: () => Int }) id: number) {
return this.userService.findOne(id);
}
@Mutation(returns => User)
createUser(@Args('createUserInput') createUserInput: CreateUserInput) {
return this.userService.create(createUserInput);
}
@Mutation(returns => User)
updateUser(
@Args('id', { type: () => Int }) id: number,
@Args('updateUserInput') updateUserInput: CreateUserInput,
) {
return this.userService.update(id, updateUserInput);
}
@Mutation(returns => Boolean)
async deleteUser(@Args('id', { type: () => Int }) id: number) {
await this.userService.delete(id);
return true;
}
}
```
### Step 7: Create DTOs
1. **Create DTOs for User Input**:
Create the `src/user/dto/create-user.input.ts`:
```typescript
import { InputType, Field } from '@nestjs/graphql';
@InputType()
export class CreateUserInput {
@Field()
name: string;
@Field()
email: string;
}
```
### Step 8: Update the User Module
1. **Update the User Module**:
Open `src/user/user.module.ts` and update it to include the controller and service:
```typescript
import { Module } from '@nestjs/common';
import { TypeOrmModule } from '@nestjs/typeorm';
import { User } from './user.entity';
import { UserService } from './user.service';
import { UserResolver } from './user.resolver';
@Module({
imports: [TypeOrmModule.forFeature([User])],
providers: [UserService, UserResolver],
})
export class UserModule {}
```
### Step 9: Run the Application
1. **Start the NestJS Application**:
```bash
npm run start:dev
```
### Step 10: Test the GraphQL API
1. **Access the GraphQL Playground**:
Navigate to `http://localhost:3000/graphql` to access the GraphQL playground and test your API by running queries and mutations.
This guide provides a foundational approach to creating a GraphQL API in NestJS connected to MySQL or PostgreSQL databases. You can further expand and customize it based on your application's requirements.
Disclaimer: This content is generated by AI. | nadim_ch0wdhury | |
1,876,178 | The Role of Self-Assessment in Distance Learning | Introduction: Distance learning has revolutionized the educational landscape, offering flexibility... | 0 | 2024-06-04T05:23:34 | https://dev.to/nelson_b_school/the-role-of-self-assessment-in-distance-learning-54lp |
**Introduction:**
[Distance learning](https://nbs.org.in/) has revolutionized the educational landscape, offering flexibility and accessibility to students worldwide. At Nelson Business School, we understand the importance of equipping students with the skills and strategies necessary for success in a virtual learning environment. One critical aspect of thriving in distance education is the practice of self-assessment. This blog post explores the role of self-assessment in distance learning, highlighting its benefits, methods, and impact on academic success.
**Understanding Self-Assessment:**
Self-assessment is the process of evaluating one’s own learning and performance. It involves reflecting on strengths and weaknesses, setting personal goals, and identifying areas for improvement. In the context of distance learning, where direct supervision and immediate feedback from instructors may be limited, self-assessment becomes a vital tool for maintaining academic progress and motivation.
**Benefits of Self-Assessment in Distance Learning:
**Enhanced Self-Awareness: Self-assessment encourages students to critically analyze their understanding of course material. This heightened self-awareness helps identify knowledge gaps and areas that require additional focus, leading to a more targeted and effective study approach.
Improved Learning Outcomes: By regularly assessing their progress, students can adjust their study strategies to better align with their learning objectives. This iterative process fosters deeper comprehension and retention of course content, ultimately improving academic performance.
Increased Motivation and Accountability: Setting personal goals and monitoring progress through self-assessment fosters a sense of ownership and responsibility. This intrinsic motivation drives students to stay committed and engaged in their studies, enhancing their overall learning experience.
Development of Critical Thinking Skills: Self-assessment requires students to evaluate their work critically, promoting the development of analytical and problem-solving skills. These competencies are invaluable not only in academic settings but also in professional and personal contexts.
Methods of Self-Assessment:
Reflective Journals: Maintaining a reflective journal allows students to document their learning experiences, challenges, and achievements. Regular entries help track progress over time and provide insights into effective study techniques and areas needing improvement.
Self-Quizzes: Creating and taking self-quizzes based on course material is an excellent way to test understanding and reinforce knowledge. Online tools and platforms offer various quiz formats, making it easy to assess comprehension regularly.
Peer Review: Engaging in peer review activities enables students to evaluate each other’s work, offering constructive feedback and gaining new perspectives. This collaborative approach enhances critical thinking and deepens understanding of the subject matter.
Goal Setting and Progress Tracking: Establishing specific, measurable, achievable, relevant, and time-bound (SMART) goals is a key component of self-assessment. Regularly reviewing and adjusting these goals based on progress helps maintain focus and motivation.
Rubrics and Checklists: Using rubrics and checklists to evaluate assignments and projects ensures consistency and objectivity in self-assessment. These tools provide clear criteria for success, making it easier to identify strengths and areas for improvement.
Implementing Self-Assessment in Distance Learning:
Create a Structured Self-Assessment Routine: Incorporate self-assessment activities into your regular study routine. Set aside dedicated time each week to reflect on your learning, complete self-quizzes, and review progress towards your goals.
Utilize Technology: Take advantage of digital tools and platforms designed to facilitate self-assessment. Learning management systems, online quizzes, and e-portfolios are excellent resources for tracking and evaluating your academic progress.
Seek Feedback and Guidance: While self-assessment is primarily an independent activity, seeking feedback from instructors and peers can provide valuable insights and enhance your understanding. Regularly participate in online discussions and seek clarification on areas of uncertainty.
Stay Honest and Objective: Effective self-assessment requires honesty and objectivity. Be critical of your work and open to identifying areas for improvement. Embrace mistakes as learning opportunities and use them to refine your study strategies.
Reflect on Feedback and Make Adjustments: After receiving feedback, take the time to reflect on it and make necessary adjustments to your study habits and strategies. Continuous improvement is the goal of self-assessment, and integrating feedback is a crucial part of this process.
Impact of Self-Assessment on Academic Success:
Empowerment and Autonomy: Self-assessment empowers students to take control of their learning journey. This sense of autonomy boosts confidence and encourages a proactive approach to education.
Personalized Learning: By identifying individual strengths and weaknesses, self-assessment allows for a more personalized learning experience. Students can focus on areas that require additional effort and seek resources tailored to their specific needs.
Enhanced Academic Performance: Regular self-assessment leads to continuous improvement, resulting in better academic performance. Students who actively engage in self-assessment are more likely to achieve their educational goals and excel in their studies.
Lifelong Learning Skills: The skills developed through self-assessment, such as critical thinking, problem-solving, and self-reflection, are valuable beyond the academic realm. These competencies are essential for lifelong learning and personal growth.
**Conclusion:**
Self-assessment plays a pivotal role in distance learning, fostering self-awareness, motivation, and critical thinking. By incorporating self-assessment practices into your study routine, you can enhance your learning outcomes and achieve academic success. Nelson Business School is dedicated to supporting students in their distance learning journey, providing the tools and resources needed to excel. Embrace self-assessment as a powerful tool for continuous improvement and take control of your educational experience. Remember, your success in distance learning is a reflection of your commitment, discipline, and willingness to grow. [Happy studying!](https://nbs.org.in/distance-learning/)
 | nelson_b_school | |
1,868,883 | PSR-4 autoloading in Laravel | What is Autoloading? Autoloading in PHP is a mechanism that automatically loads the... | 0 | 2024-05-29T11:01:19 | https://dev.to/vimuth7/psr-4-autoloading-in-laravel-57nn | ##What is Autoloading?
Autoloading in PHP is a mechanism that automatically loads the classes, interfaces, or traits you need when you use them, without the need to manually include or require their files. This helps keep your code clean and organized, especially in large projects.
##Example Without Autoloading
**1.Define Classes**
Let's say you have two classes in different files:
```
// File: app/Services/ExampleService.php
namespace App\Services;
class ExampleService {
public function sayHello() {
return 'Hello, World!';
}
}
// File: app/Helpers/Helper.php
namespace App\Helpers;
class Helper {
public function greet() {
return 'Greetings!';
}
}
```
**2.Include Classes Manually**
In your main script, you need to manually include these files:
```
// File: index.php
require 'app/Services/ExampleService.php';
require 'app/Helpers/Helper.php';
use App\Services\ExampleService;
use App\Helpers\Helper;
$exampleService = new ExampleService();
echo $exampleService->sayHello(); // Outputs: Hello, World!
$helper = new Helper();
echo $helper->greet(); // Outputs: Greetings!
```
##Errors on this approach
- You need to write a require statement for every single class file you use.
- It’s easy to forget to include a file, leading to errors.
- If we add require statement multiple places for same file it can lead to errors.
For this last error we can use 'require_once' but it is slower and first issue still exists.
##PSR-4 Autoloading with Composer
To avoid those issues laravel uses PSR-4 autoloading with composer. It is really simple.
**1.Define Classes**
The class definitions remain the same as above:
```
// File: app/Services/ExampleService.php
namespace App\Services;
class ExampleService {
public function sayHello() {
return 'Hello, World!';
}
}
// File: app/Helpers/Helper.php
namespace App\Helpers;
class Helper {
public function greet() {
return 'Greetings!';
}
}
```
**2.Configure Composer**
Add the autoload section in your composer.json file:
```
{
"autoload": {
"psr-4": {
"App\\": "app/"
}
}
}
```
**3.Run the command to generate the autoload files:**
```
composer dump-autoload
```
**4.Use Classes Without Manual Includes**
Now, in your main script, you can use the classes without manually including their files:
```
// File: index.php
require 'vendor/autoload.php'; // Composer's autoload file
use App\Services\ExampleService;
use App\Helpers\Helper;
$exampleService = new ExampleService();
echo $exampleService->sayHello(); // Outputs: Hello, World!
$helper = new Helper();
echo $helper->greet(); // Outputs: Greetings!
```
That is it. Composer does the rest. Cool right? | vimuth7 | |
1,876,177 | Intermediate Linux Shell Scripting: Taking Your Skills to the Next Level | As you progress from basic to intermediate shell scripting, you begin to unlock more powerful... | 0 | 2024-06-04T05:23:12 | https://dev.to/iaadidev/intermediate-linux-shell-scripting-taking-your-skills-to-the-next-level-3mg5 | linux, script, bash, devops | As you progress from basic to intermediate shell scripting, you begin to unlock more powerful capabilities, allowing for more complex automation and system management tasks. This blog will cover essential intermediate concepts such as conditional statements, loops, functions, and script parameters, providing relevant examples to illustrate their use.
#### 1. Conditional Statements: Making Decisions in Scripts
Conditional statements enable your script to make decisions based on certain conditions. The `if-elif-else` structure is fundamental in shell scripting:
```
bash
#!/bin/bashecho “Enter a number:”
read number
if [ $number -gt 10 ]; then
echo “The number is greater than 10.”
elif [ $number -eq 10 ]; then
echo “The number is exactly 10.”
else
echo “The number is less than 10.”
fi
```
In this example, the script reads a number from the user and prints a message based on the value of the number.
#### 2. Loops: Automating Repetitive Tasks
Loops allow you to execute a series of commands repeatedly. The `for` loop and `while` loop are commonly used in shell scripting:
**For Loop:**
```
bash
#!/bin/bash
for i in {1..5}; do
echo “Iteration $i”
done
```
**While Loop:**
```
bash
#!/bin/bash
count=1
while [ $count -le 5 ]; do
echo “Count: $count”
count=$((count + 1))
done
```
These loops help automate repetitive tasks, such as processing files or executing commands multiple times.
#### 3. Functions: Organizing Code for Reusability
Functions make scripts more modular and easier to maintain by encapsulating code into reusable blocks. Here’s how to define and use functions:
```
bash
#!/bin/bash
# Define a function
greet() {
local name=$1
echo “Hello, $name!”
}
# Call the function
greet “Alice”
greet “Bob”
```
In this example, `greet` is a function that takes one argument (`name`) and prints a greeting message. Using `local` ensures the variable scope is limited to the function.
#### 4. Script Parameters: Enhancing Script Flexibility
Scripts can accept parameters to make them more flexible and reusable. Parameters are accessed using `$1`, `$2`, etc., where `$1` is the first parameter, `$2` is the second, and so on:
```
bash
#!/bin/bash
if [ $# -lt 2 ]; then
echo “Usage: $0 <name> <age>”
exit 1
fi
name=$1
age=$2
echo “Name: $name, Age: $age”
```
This script checks if at least two parameters are provided and then uses them within the script. `$#` gives the number of parameters passed to the script.
#### 5. Arrays: Handling Multiple Values
Arrays are useful for storing and processing lists of data. Here’s an example of how to declare and use arrays in a shell script:
```
bash
#!/bin/bash
# Declare an array
fruits=(“Apple” “Banana” “Cherry”)
# Access array elements
echo “First fruit: ${fruits[0]}”
# Loop through the array
for fruit in “${fruits[@]}”; do
echo “Fruit: $fruit”
done
```
This script demonstrates how to declare an array, access individual elements, and iterate through all elements.
#### 6. Error Handling: Creating Robust Scripts
Handling errors is crucial for creating reliable scripts. The `set -e` command makes the script exit immediately if any command fails:
```
bash
#!/bin/bash
set -e
mkdir /some/directory
cd /some/directory
touch file.txt
echo “All commands executed successfully!”
```
For more control, you can use `trap` to catch errors and execute a specific function:
```
bash
#!/bin/bash
trap ‘echo “An error occurred. Exiting…”; exit 1;’ ERR
echo “Executing command…”
false # This command will fail
echo “This line will not be executed.”
```
#### Conclusion
Intermediate shell scripting in Linux opens up new possibilities for automation and system management. By mastering conditional statements, loops, functions, script parameters, arrays, and error handling, you can create more powerful and flexible scripts. These concepts form the foundation for advanced scripting techniques and enable you to tackle more complex tasks efficiently.
Happy scripting! | iaadidev |
1,876,176 | How to create RESTful API in Nest JS? Step by step guidelines! | Creating a RESTful API in NestJS involves several steps. Here’s a step-by-step theoretical guide: ... | 0 | 2024-06-04T05:20:45 | https://dev.to/nadim_ch0wdhury/how-to-create-restful-api-in-nest-js-step-by-step-guidelines-5eg9 | Creating a RESTful API in NestJS involves several steps. Here’s a step-by-step theoretical guide:
### Step 1: Setup a New NestJS Project
1. **Install Nest CLI**:
```bash
npm install -g @nestjs/cli
```
2. **Create a New Project**:
```bash
nest new project-name
```
3. **Navigate to the Project Directory**:
```bash
cd project-name
```
### Step 2: Generate a Module, Controller, and Service
1. **Generate a Module**:
```bash
nest g module user
```
2. **Generate a Controller**:
```bash
nest g controller user
```
3. **Generate a Service**:
```bash
nest g service user
```
### Step 3: Define the User Entity
1. **Create a User Entity**:
Create the `src/user/user.entity.ts` file:
```typescript
export class User {
id: number;
name: string;
email: string;
}
```
### Step 4: Implement the User Service
1. **Implement Service Logic**:
Open `src/user/user.service.ts` and implement the service methods:
```typescript
import { Injectable } from '@nestjs/common';
import { User } from './user.entity';
@Injectable()
export class UserService {
private users: User[] = [];
private idCounter = 1;
findAll(): User[] {
return this.users;
}
findOne(id: number): User {
return this.users.find(user => user.id === id);
}
create(user: User): User {
user.id = this.idCounter++;
this.users.push(user);
return user;
}
update(id: number, updatedUser: Partial<User>): User {
const user = this.findOne(id);
if (user) {
Object.assign(user, updatedUser);
}
return user;
}
delete(id: number): void {
this.users = this.users.filter(user => user.id !== id);
}
}
```
### Step 5: Implement the User Controller
1. **Implement Controller Logic**:
Open `src/user/user.controller.ts` and define the routes:
```typescript
import { Controller, Get, Post, Put, Delete, Param, Body } from '@nestjs/common';
import { UserService } from './user.service';
import { User } from './user.entity';
@Controller('users')
export class UserController {
constructor(private readonly userService: UserService) {}
@Get()
findAll(): User[] {
return this.userService.findAll();
}
@Get(':id')
findOne(@Param('id') id: string): User {
return this.userService.findOne(+id);
}
@Post()
create(@Body() user: User): User {
return this.userService.create(user);
}
@Put(':id')
update(@Param('id') id: string, @Body() updatedUser: Partial<User>): User {
return this.userService.update(+id, updatedUser);
}
@Delete(':id')
delete(@Param('id') id: string): void {
this.userService.delete(+id);
}
}
```
### Step 6: Update the User Module
1. **Update the User Module**:
Open `src/user/user.module.ts` and update it to include the controller and service:
```typescript
import { Module } from '@nestjs/common';
import { UserController } from './user.controller';
import { UserService } from './user.service';
@Module({
controllers: [UserController],
providers: [UserService],
})
export class UserModule {}
```
### Step 7: Integrate the User Module into the App Module
1. **Update the App Module**:
Open `src/app.module.ts` and update it to include the User module:
```typescript
import { Module } from '@nestjs/common';
import { UserModule } from './user/user.module';
@Module({
imports: [UserModule],
})
export class AppModule {}
```
### Step 8: Run the Application
1. **Start the NestJS Application**:
```bash
npm run start:dev
```
### Step 9: Test the RESTful API
1. **Test the API Endpoints**:
Use a tool like Postman or curl to test the RESTful API endpoints:
- `GET /users`: Retrieve all users.
- `GET /users/:id`: Retrieve a user by ID.
- `POST /users`: Create a new user.
- `PUT /users/:id`: Update a user by ID.
- `DELETE /users/:id`: Delete a user by ID.
This guide provides a foundational approach to creating a RESTful API in NestJS. You can further expand and customize it based on your application's requirements.
Disclaimer: This content is generated by AI. | nadim_ch0wdhury | |
1,876,138 | Getting started with Mylanguage | Summary What is the M language? The so-called M language is a set of programmatic... | 0 | 2024-06-04T05:18:55 | https://dev.to/fmzquant/getting-started-with-mylanguage-270h | mylanguage, trading, cryptocurrency, fmzquant | ## Summary
What is the M language? The so-called M language is a set of programmatic functions that extend from the early stock trading technical indicators. Encapsulating the algorithm into a single function, the user only needs to call a certain function like "building blocks" to implement the strategy logic.
It adopts the construction mode of " small grammar, big function " , which greatly improves the programming efficiency. The strategy writing of more than 100 sentences in other languages can be compiled with only few lines in M languages. The financial statistical function library and data structure in conjunction with the FMZ Quant tool can also support some complex trading logic.
## Complete strategy
In order to help you quickly understand the key knowledge of this section, before introducing the FMZ Quant M language, let's first have a preliminary understanding of the noun concept of this section. We will still use the long-term 50-day moving average and the short-term 10-day moving average as the basic case, and review the complete strategy case mentioned in the previous chapter:
- Open long position: If there is currently no position, and the closing price is greater than the short-term moving average, and the closing price is greater than the long-term moving average, and the short-term moving average is greater than the long-term moving average, and the long-term moving average is rising.
- Open short position: If there is currently no position, and the closing price is less than the short-term moving average, and the closing price is less than the long-term moving average, and the short-term moving average is less than the long-term moving average, and the long-term moving average is falling.
- Close Long position: If currently hold long position, and the closing price is less than the long-term moving average, or the short-term moving average is less than the long-term moving average, or the long-term moving average is falling.
- Close Short position: If current hold short position, and the closing price is greater than the long-term moving average, or the short-term moving average is greater than the long-term moving average, or the long-term moving average is rising.
If you write it by M language, it will be:
```
MA10:=MA(CLOSE,10); // Get the 10-cycle moving average of the latest K-line and save the result in variable MA10
MA50:=MA(CLOSE,50); // Get the 50-cycle moving average of the latest K-line and save the result in variable MA50
MA10_1:=REF(MA10,1); //Get the 10-cycle moving average of the pervious K line and save the result to variable MA10_1
MA50_1:=REF(MA50,1); //Get the 50-cycle moving average of the pervious K line and save the result to variable MA50_1
MA10_2:=REF(MA10,2); //Get the 10-cycle moving average of the latest K line and save the result to variable MA10_2
MA50_2:=REF(MA50,2); //Get the 50-cycle moving average of the latest K line and save the result to variable MA50_2
MA50_ISUP:=MA50>MA50_1 AND MA50_1>MA50_2; //Determine whether the current 50-line moving average of the K line is rising
MA50_ISDOWN:=MA50<MA50_1 AND MA50_1<MA50_2; //Determine whether the current 50-line moving average of the K line is falling
CLOSE>MA10 AND CLOSE>MA50 AND MA10>MA50 AND MA50_ISUP,BK; //open long position
CLOSE<MA10 AND CLOSE<MA50 AND MA10<MA50 AND MA50_ISUP,SK; //open short position
CLOSE<MA50 OR MA10<MA50,SP;//close long position
CLOSE>MA50 OR MA10>MA50,BP;//close short position
```
To write a complete trading strategy, you will need : data acquisition, data calculation, logic calculation, and placing orders. As shown in the above, in the entire code, only one API for getting the basic data is used , which is the " CLOSE " in the first and second lines ; then the first to the ninth lines are the data calculation parts; Lines 11 through 14 are logical calculations and placing order part.
Note that the MA10, MA50, MA10_1, MA50_1, MA10_2, and MA50_2 are variables; in the first to ninth lines, the " := " is an assignment sign, and the data to the right of the assignment sign is assigned to the variable to the left of the assignment sign; the "MA" is the API , for example, in the first line, calling MA (the moving average) needs to pass in two parameters. You can think the setting as the incoming parameter, that is, when calling MA , you need to set the type of MA ; the " AND " " OR " are logical operators that are mainly used to connect multiple logical calculations and so on. With the above basic knowledge concept, let's start to learn the detailed M language knowledge.
## Basic data
The basic data (opening price, highest price, lowest price, closing price, volume) is an indispensable part of the quantitative trading. To obtain the latest basic data in the strategy, you only need to call the API of the FMZ Quant. If you want to get the basic data of historical price, you can use " REF ", such as: REF (CLOSE, 1) is to get yesterday's closing price.
## Variable
Variables can be changed. The name of a variable can be understood as a code name. Its name is supported by English letters, numbers, and lines. However, the length must be controlled within 31 characters. Variable names cannot be repeated with another one, cannot be duplicated with parameter names, cannot be repeated with function names ( APIs ), and each statement should end with a semicolon. Writing comments after the " // " . As shown below:
```
INT:=2; //Integer type
FLOAT:=3.1; //Floating point
ISTRUE:=CLOSE>OPEN; //Boolean type
```
## Variable assignment
The variable assignment means that the value to the right of the assignment sign is given to the variable on the left. There are four types of assignments, which can control whether the value is displayed on the chart or the position of the display. They are " : ", " := ", " ^^ ", " .. ", and the code comments at below explain their meaning in detail.
```
CC1: C; //Assign the closing price to the variable CC1 and display it in the sub-chart
CC2:=C; //Assign the closing price to variable CC2, but not display in the status bar and chart
CC3^^C; //Assign the closing price to the variable CC3 and display it in the main chart
CC4..0; //Assign the closing price to the variable CC4 and display it in the status bar, but not in the chart
```
## Type of data
There are several data types in the M language, the most common of which are numeric types, string types, and boolean types. The numeric type are numbers, including integers, decimals, positive and negative numbers, etc., such as: 1 , 2 , 3 , 1.1234 , 2.23456 ...; string type can be understood as text, Chinese, English, numbers also can be strings, such as : 'the FMZ Quant', 'CLOSEPRICE', '6000', the string type must be wrapped with double quotes; Boolean type is the simplest, it only has two values of "yes" and "No", such as: 1 with representatives true means "yes" and 0 for false indicates "no."
## Relational operator
Relational operators, as the name suggests, are operators used to compare the relationship of two values. They are equal to, greater than, less than, greater than or equal to, less than or equal to, not equal to, as shown below:
```
CLOSE = OPEN; //when closing price equals to opening price, return 1 (true), otherwise return 0 (false)
CLOSE > OPEN; //when closing price greater than opening price, return 1 (true), otherwise return 0 (false)
CLOSE < OPEN; //when closing price less than opening price, return 1 (true), otherwise return 0 (false)
CLOSE >= OPEN; //when closing price greater than or equal to opening price, return 1 (true), otherwise return 0 (false)
CLOSE <= OPEN; //when closing price less than or equal to opening price, return 1 (true), otherwise return 0 (false)
CLOSE <> OPEN; //when closing price is not equal to opening price, return 1 (true), otherwise return 0 (false)
```
## Logical Operators
Logical operations can join separate Boolean type statements into the whole, the most common being used are " AND " and " OR ". Suppose there are two Boolean type values, "Closing price is greater than opening price" and "Closing price is greater than moving average", we can group them into a Boolean value, for example: "The closing price is greater than the opening price and ( AND ) closing price is greater than the moving average "," the closing price is greater than the opening price or ( OR ) closing price is greater than the moving average."
```
AA:=2>1; //return true
BB:=4>3; //return true
CC:=6>5; //return true
DD:=1>2; //return false
```
Please pays attention:
- " AND " is when all conditions are “true” and the final condition is “true”;
- " OR " means in all conditions, as long as any of the conditions is "true", the final condition is "true".
- " AND " can be written as " && ", and " OR " can be written as " || ".
## Arithmetic operator
There is no difference between the arithmetic operators (" + ”, " - ”, " * ”, " / ”) used in M languages and the mathematics of regular school learning, as shown below:
```
AA:=1+1; //the result is 2
BB:=2-1; //the result is 1
CC:=2*1; //the result is 2
DD:=2/1; //the result is 2
```
## Priority
If there is a 100*(10-1)/(10+5) expression, which step is the program first calculated? Middle school mathematics tells us:
1. If it is the same level of operation, it is generally calculated from left to right.
2. If there are additions and subtractions, and multiplication and division , first calculate the multiplication and division, then additions and subtractions.
3. If there are brackets, first calculate the inside of the brackets.
4. If the law of easy-operation is met, the law can be used for the calculation.
The same is true for the M language, as shown below:
```
100*(10-1)/(10+5) //the result is 60
1>2 AND (2>3 OR 3<5) //the result is false
1>2 AND 2>3 OR 3<5 //the result is true
```
## Execution Mode
In the M language of the FMZ Quant tool, there are two modes of program execution, namely, the closing price mode and the real-time price mode. The closing price mode means that when the current K-line signal is established, placing order on the next K-line. the real-time mode is executing immediately when the current k-line signal is established.
## Intraday strategy
If it is an intraday trading strategy, you need to use the " TIME " time function when you need to close the position in the end. This function is above second cycle and below day cycle, shown in the form of four digits : HHMM (1450 - 14 : 50). Note: Using the TIME function as a condition for closing position at the end of the session, it is recommended that the opening position conditions be subject to the corresponding time limit. As shown below:
```
CLOSE>OPEN && TIME<1450,BK; //if it is a positive k-line and the time is less than 14:50, opening position.
TIME>=1450,CLOSEOUT; //if the time is beyond 14:50, closing all position.
```
## Model classification
There are two types of model classification in the M language: non-filtering model and filtering model. This is actually very well understood: the non-filtering model allows for continuous opening or closing signals, which can be used to add and reduce positions. The filtering model does not allow continuous opening or closing signals, that is, when the opening signal appears, the subsequent opening signal will be filtered until the closing signal appears. The order of the non-filtering model is: open position - close position - open position - close position - open position...
## To sum up
The above is the content of the quick start of the M language, now you can program your own trading strategy now. If you need to write a more complex one, you can refer to the FMZ Quant platform's M language API documentation, or directly consult the official customer service to write it for you
## Next section notice
Intraday trading is also a popular trading mode. This method does not holding position overnight. Therefore, it is subject to low risk of market volatility. Once unfavorable market conditions occur, it can be adjusted in time. In the next section, we will bring you to write a feasible intraday trading strategy.
## After-school exercises
1. Try to use the FMZ Quant tool to get the basic date from API by M language.
2. How many display methods for variable assignment in the chart?
From: https://blog.mathquant.com/2019/04/19/3-2-getting-started-with-the-m-language.html | fmzquant |
1,876,137 | My name is ameen ahamed | I was studded at 3rd STD My dad was died | 0 | 2024-06-04T05:18:48 | https://dev.to/ameen_ahamed_5ce6bb3edbf5/my-name-is-ameen-ahamed-4ad1 | I was studded at 3rd STD
My dad was died | ameen_ahamed_5ce6bb3edbf5 | |
1,876,136 | How to create GraphQL API in Nest JS? Step by Step guidelines! | Creating a GraphQL API in NestJS involves several steps. Here's a step-by-step theoretical guide: ... | 0 | 2024-06-04T05:18:47 | https://dev.to/nadim_ch0wdhury/how-to-create-graphql-api-in-nest-js-step-by-step-guidelines-2cej | Creating a GraphQL API in NestJS involves several steps. Here's a step-by-step theoretical guide:
### Step 1: Setup a New NestJS Project
1. **Install Nest CLI**:
```bash
npm install -g @nestjs/cli
```
2. **Create a New Project**:
```bash
nest new project-name
```
3. **Navigate to the Project Directory**:
```bash
cd project-name
```
### Step 2: Install GraphQL and Apollo Server
1. **Install Required Packages**:
```bash
npm install @nestjs/graphql graphql apollo-server-express
```
### Step 3: Configure GraphQL Module
1. **Create a GraphQL Module Configuration**:
Open `src/app.module.ts` and configure the GraphQL module:
```typescript
import { Module } from '@nestjs/common';
import { GraphQLModule } from '@nestjs/graphql';
import { join } from 'path';
@Module({
imports: [
GraphQLModule.forRoot({
autoSchemaFile: join(process.cwd(), 'src/schema.gql'),
}),
],
})
export class AppModule {}
```
### Step 4: Create a Resolver
1. **Generate a Resolver**:
Use the Nest CLI to generate a resolver:
```bash
nest g resolver user
```
2. **Define Resolver Logic**:
Open `src/user/user.resolver.ts` and define the resolver logic:
```typescript
import { Resolver, Query, Mutation, Args } from '@nestjs/graphql';
import { UserService } from './user.service';
import { User } from './user.entity';
import { CreateUserInput } from './dto/create-user.input';
@Resolver(of => User)
export class UserResolver {
constructor(private readonly userService: UserService) {}
@Query(returns => [User])
async users() {
return this.userService.findAll();
}
@Mutation(returns => User)
async createUser(@Args('createUserInput') createUserInput: CreateUserInput) {
return this.userService.create(createUserInput);
}
}
```
### Step 5: Create a Service
1. **Generate a Service**:
Use the Nest CLI to generate a service:
```bash
nest g service user
```
2. **Implement Service Logic**:
Open `src/user/user.service.ts` and implement the service logic:
```typescript
import { Injectable } from '@nestjs/common';
import { User } from './user.entity';
import { CreateUserInput } from './dto/create-user.input';
@Injectable()
export class UserService {
private users: User[] = [];
findAll(): User[] {
return this.users;
}
create(createUserInput: CreateUserInput): User {
const user = { ...createUserInput, id: Date.now().toString() };
this.users.push(user);
return user;
}
}
```
### Step 6: Define GraphQL Schema and DTOs
1. **Create GraphQL Schema and DTOs**:
Create the `src/user/user.entity.ts`:
```typescript
import { ObjectType, Field, ID } from '@nestjs/graphql';
@ObjectType()
export class User {
@Field(type => ID)
id: string;
@Field()
name: string;
@Field()
email: string;
}
```
Create the `src/user/dto/create-user.input.ts`:
```typescript
import { InputType, Field } from '@nestjs/graphql';
@InputType()
export class CreateUserInput {
@Field()
name: string;
@Field()
email: string;
}
```
### Step 7: Update Module
1. **Update the Module to include Resolver and Service**:
Open `src/user/user.module.ts` and update it:
```typescript
import { Module } from '@nestjs/common';
import { UserService } from './user.service';
import { UserResolver } from './user.resolver';
@Module({
providers: [UserService, UserResolver],
})
export class UserModule {}
```
### Step 8: Integrate the User Module
1. **Integrate the User Module into the App Module**:
Open `src/app.module.ts` and update it:
```typescript
import { Module } from '@nestjs/common';
import { GraphQLModule } from '@nestjs/graphql';
import { join } from 'path';
import { UserModule } from './user/user.module';
@Module({
imports: [
GraphQLModule.forRoot({
autoSchemaFile: join(process.cwd(), 'src/schema.gql'),
}),
UserModule,
],
})
export class AppModule {}
```
### Step 9: Run the Application
1. **Start the NestJS Application**:
```bash
npm run start:dev
```
### Step 10: Test the GraphQL API
1. **Access the GraphQL Playground**:
Navigate to `http://localhost:3000/graphql` to access the GraphQL playground and test your API by running queries and mutations.
This guide provides a foundational approach to creating a GraphQL API in NestJS. You can further expand and customize it based on your application's requirements.
Disclaimer: This content in generated by AI. | nadim_ch0wdhury | |
1,876,135 | Experience India's Majesty: Aboard the Palace on Wheels Train | Imagine yourself transported to a land of vibrant colors, majestic forts, and captivating history.... | 0 | 2024-06-04T05:18:37 | https://dev.to/palaceonwheelsindia/experience-indias-majesty-aboard-the-palace-on-wheels-train-3b15 | Imagine yourself transported to a land of vibrant colors, majestic forts, and captivating history. Welcome to Rajasthan, also known as the Land of Kings . This extraordinary region in northwestern India boasts a rich heritage dating back centuries, evident in its opulent palaces, bustling bazaars, and age-old traditions. However, what if you could experience Rajasthan not just as a tourist, but as royalty? This is the unparalleled experience offered by the [Palace on Wheels](https://www.palaceonwheels.in/), India's premier luxury train. Palace on Wheels India is not merely a mode of transportation; it's a journey through time, whisking you away to a bygone era of elegance and grandeur.
Embark on a Royal Adventure: Unveiling the Jewels of Rajasthan
The story of the Palace on Wheels is intrinsically linked to Rajasthan's royal legacy. These very carriages were once the personal railway coaches of Maharajas and Viceroys, meticulously crafted for journeys steeped in comfort and opulence. Relaunched in 1982, the Palace on Wheels continues this tradition, offering a unique opportunity to experience Rajasthan in unparalleled style.
A Curated Journey Through Time: The Palace on Wheels Itinerary
The itinerary of the Palace on Wheels is a meticulously crafted masterpiece, encompassing some of Rajasthan's most captivating destinations. Prepare to be dazzled by the majestic forts and palaces of Jaipur, the Pink City. Immerse yourself in the timeless beauty of Jaisalmer, the Golden City, where the imposing Jaisalmer Fort rises from the desert sands. In Ranthambore National Park, thrill to the possibility of encountering majestic tigers and a dazzling array of wildlife. These are just a few of the highlights that await you on this unforgettable journey. A detailed itinerary will be provided upon boarding the Palace on Wheels, ensuring you don't miss a single treasure.
Beyond the Tracks: Unveiling Rajasthan's Gems
While the Palace on Wheels itself offers an unparalleled experience, the journey isn't confined to its luxurious confines. At each stop, meticulously planned off-train excursions will unveil the historical and cultural gems of Rajasthan. Expert guides will lead you through magnificent forts and palaces, whispering tales of their storied past. Imagine exploring the Amber Fort, a UNESCO World Heritage Site, and marveling at its intricate architecture. In bustling bazaars overflowing with vibrant textiles and handcrafted souvenirs, you'll have the opportunity to find unique treasures and immerse yourself in the sights and sounds of Rajasthani life. These excursions promise an immersive experience that goes beyond sightseeing, transporting you to the heart of Rajasthan's rich cultural tapestry.
Living Like Royalty: A Palace on Wheels Experience
Stepping aboard the Palace on Wheels is akin to stepping into a bygone era of opulence. Imagine yourself greeted by warm hospitality and ushered into the grandeur of the carriages, each named after a former princely state like Rajputana or Baroda. These carriages are individually decorated with rich fabrics, intricate woodwork, and exquisite art that reflects the grandeur of their princely heritage.
Your Luxurious Haven: In-Cabin Amenities
Your home away from home on this royal adventure is your spacious deluxe cabin. A haven of comfort, it's furnished with plush upholstery and adorned with traditional Rajasthani motifs. A well-appointed bathroom ensures your utmost convenience. Adding to the regal experience, you'll be assigned a personal butler who will cater to your every need, from unpacking your luggage to arranging excursions. Whether you desire a refreshing beverage or assistance with planning your attire for a themed evening, your personal butler will be at your service, ensuring a truly unforgettable experience.
A Culinary Journey Through Rajasthan: Fine Dining on the Palace on Wheels
But the indulgence doesn't stop there. The Palace on Wheels boasts two exquisite restaurants, aptly named Maharaja Restaurant and Maharani Restaurant, where you'll embark on a culinary journey through Rajasthan. Talented chefs will tantalize your taste buds with an array of delectable dishes, showcasing the region's rich culinary heritage. From succulent curries and aromatic biryanis to melt-in-your-mouth desserts, prepare to be treated to a feast for the senses. In keeping with the royal theme, the meals are served on elegant crockery with attentive service, making every dining experience an occasion. | palaceonwheelsindia | |
1,876,134 | Compressors: Powering Air Operated Valves and Actuators in Industries | Compressors: Powering Sky Run Shutoffs as well as Actuators in Markets Compressors are actually... | 0 | 2024-06-04T05:18:14 | https://dev.to/brenda_hernandezg_26bd74a/compressors-powering-air-operated-valves-and-actuators-in-industries-1occ | compress |
Compressors: Powering Sky Run Shutoffs as well as Actuators in Markets
Compressors are actually extremely essential devices that are actually utilized for a selection of various functions in markets. Among one of the absolute most essential requests of compressors remains in powering sky run shutoffs as well as actuators. we'll be actually talking about the numerous benefits of utilization compressors for this function, in addition to ways to utilize all of them securely as well as effectively, as well as the various requests they could be utilized for
Benefits
Using Air Tank compressors for powering sky run shutoffs as well as actuators includes a variety of benefits. Among the primary benefits is actually that they offer a dependable, constant resource of energy without the require for electrical power or even various other outside source of power. This creates all of them perfect for utilize in distant places or even in circumstances where electrical power is actually certainly not easily offered
Another benefit of utilization compressors is actually that they are actually extremely flexible as well as could be utilized in a wide variety of requests. They could be utilized in all coming from production towards mining towards oil as well as fuel drilling. Furthermore, they are actually extremely user-friendly as well as need hardly any upkeep, creating all of them a prominent option for various markets
Development
Just like lots of various other kinds of equipment, compressors have actually developed considerably throughout the years. Today, certainly there certainly are actually various kinds of Stainless Steel Air Tank compressors offered, varying coming from easy piston compressors towards advanced rotating turn compressors. These more recent compressors deal a variety of advantages over more mature designs, consisting of enhanced effectiveness as well as reduced upkeep demands
Security
When utilizing compressors towards energy sky run shutoffs as well as actuators, security is actually of utmost significance. It is essential towards constantly comply with appropriate security procedures as well as towards guarantee that the compressor is actually utilized according to its own meant function. This implies guaranteeing that hose pipes as well as installations are actually correctly protected, which all of security manages remain in location as well as performance correctly
Utilize
When utilizing a Aluminum Air Tank compressor towards energy sky run shutoffs as well as actuators, certainly there certainly are actually a couple of essential points towards bear in mind. Very initial, it is essential towards guarantee that the compressor is actually correctly sized for the request. This implies selecting a compressor that can providing the needed air flow as well as stress
Furthermore, it is essential towards guarantee that the compressor is actually correctly preserved as well as serviced regularly. This will certainly assist towards guarantee that the compressor stays in great functioning purchase which it remains to offer dependable, constant efficiency
Solution
Towards guarantee that the compressor remains to carry out at its own finest, it is essential towards have actually it serviced routinely. This might include changing used components, like belts or even filtering system, or even carrying out much a lot extra comprehensive repair work if required. Routine maintenance can easily assist towards extend the lifestyle of your compressor as well as guarantee that it remains to run at top efficiency
High top premium
When it concerns selecting a compressor for utilize in powering sky run shutoffs as well as actuators, high top premium is actually essential. It is essential towards select a compressor that's produced towards higher requirements which has actually a tested performance history of offering dependable, constant efficiency. Through selecting a top quality compressor, you could be positive that it will certainly offer the efficiency you require, when you require it
Request
Compressors are actually utilized in a wide variety of requests, coming from production as well as mining towards oil as well as fuel drilling as well as past. They are actually perfect for powering sky run shutoffs as well as actuators in a selection of various commercial setups, offering a dependable, constant resource of energy without the require for outside electrical power or even various other source of power
Source: https://www.youchengzhixin.com/air-tank | brenda_hernandezg_26bd74a |
1,876,133 | Python Programming: A Beginner’s Guide | Python is an interpreted, high-level, powerful general-purpose programming language. You may ask,... | 27,589 | 2024-06-04T05:17:08 | https://dev.to/afraazahmed/python-programming-a-beginners-guide-1hig | beginners, programming, python, career | Python is an interpreted, high-level, powerful general-purpose programming language.
You may ask, Python’s a snake right? and Why is this programming language named after it?
Well, you are in the right place to discover it! and I’ll also answer the Why? What? How? Questions on Python programming.
## Why do we need to know about Python?
**People prefer Python over French (What!😮)**
According to a recent survey, in the UK, Python overtook French to be the most popular language taught in primary schools. (OMG!)
6 of 10 parents preferred their children to learn Python over French.
So hurry up🏃♂️🏃♀️(or these kids will for sure)! get ready to learn it! coz there’s a possibility of you being hired by one of the companies mentioned below!!!
## Big Companies🏢 are using Python
NASA, Google, Nokia, IBM, Yahoo!,
Google Maps, edX,
Walt Disney Feature Animation, Facebook,
Netflix, Expedia, Reddit, Quora, MIT,
Disqus, Hike, Spotify, Udemy, Shutterstock,
Uber, Amazon, Mozilla, Dropbox,
Pinterest, YouTube and many more…
##Applications of Python in the real world🗺
> Artificial Intelligence and Machine Learning
Data Science
Web Development
Automation/Testing
Scripting
Web Scraping
and many more…
## What is Python?
## Some History and Why the name ‘Python’?
Let’s start a Flashback tale (Trust me it’s interesting😉).
Python was created by a guy named Guido van Rossum.
Guido Van Rossum was looking for a hobby project to keep him occupied in the week around Christmas.
He chose to call it Python, coz Guido himself is a big fan of Monty Python’s Flying Circus (Popular British comedy troupe).
So rather than being in an irrelevant mood he named the project ‘Python’.
Hence the name Python was adopted. Well, this resulted in you reading my Blog(Hahaha!), but here’s a fact (Are you ready to be stunned?)
Python influenced Javascript and 8 other languages to be designed,
-> C, Java, Perl, AWK, HyperTalk, Lua, Scheme and Self.
😮Yes, you read it right!!, Python has influenced all these languages to be either designed or updated after it.
## What do you need to know about Python?
Well, now you may wonder if Python is something worthwhile to know isn’t!
👇Here’s Bite-sized info to offer you basic points on the features of Python programming language. (Apologies for my Handwriting!😅).
## Python Ecosystem
Python is a favourite choice for programming when it comes to Machine Learning, Deep Learning or even Web Development.
The ecosystem grows a lot day by day with libraries and frameworks(some of the most used ones are mentioned in this sketch right down below 👇!).
## Let me list these out with its functionalities:-
Machine Learning/Data Science: Pandas(Data Analysis), NumPy, SciPy (Mathematical and scientific computation), MatPlotLib (Plotting), Scikit-learn, Tensorflow, PyTorch(Machine Learning/Deep Learning libraries).
Jupyter Notebook: Developer Environment
Web Development: Flask(Micro Web Framework), Django(Multi-level Web Framework).
##How and Where Should You Start Learning?
**Certification Courses:-**
- [**Complete Python Developer: Zero to Mastery course**]
(https://zerotomastery.io/courses/learn-python/)
- I have been learning Python this year from an awesome Instructor, Andrei Neagoie (a Senior Developer) and he also has created an academy - [Zero to Mastery (ZTM).](https://zerotomastery.io/)
- [ZTM](https://zerotomastery.io/) is a platform with courses touching the topics like Web Development, Machine Learning, JavaScript, Deno and much more so check it out if you’re interested: [zerotomastery.io](https://zerotomastery.io/)
- [**Coursera — Crash course on Python**](https://www.coursera.org/learn/python-crash-course?specialization=google-it-automation)
- It is the first course of 6 part course series from the Professional Certification course — Google IT Automation with Python Professional Certificate, offered by Google.
- You can audit the courses to try out for free.
## Free to Use:-
- [**Python Official Documentation**](https://www.python.org/doc/): You can always learn from and refer to, the Official documentation of Python, it’s always free.
- [**Python Tutorial for Beginners**](https://www.youtube.com/playlist?list=PLsyeobzWxl7poL9JTVyndKe62ieoN-MZ3): Check out this YouTube tutorial on Python for Beginners by Telusko Channel.
- [**FreeCodeCamp**](https://www.freecodecamp.org/news/best-python-tutorial/): It’s a good website that provides lots of resources on Python Tutorials.
## Bonus Section
Are you interested to know more about Python in-depth?
- [**Python Blog Series**](https://dev.to/afraazahmed/series/27589): A Blog series where I will be learning and sharing my knowledge of the Python Programming Language.
- [**Learn Python for Free, Get Hired, and (maybe) Change the World!**](https://zerotomastery.io/blog/best-way-to-learn-python-for-free): A detailed roadmap blog by Jayson Lennon (a Senior Software Engineer) with links to free resources.
- To learn more in-depth about Python (right now), check out this Playlist 👉 by Andrei Neagoie on — [**Become a Python Developer**](https://www.youtube.com/watch?v=54ILmXAHC0M&list=PL2HX_yT71umCoQEFRTTFxGMlzxPjytcKi)
- Do you want to become a Python Developer and work on Real-life applications? Check out this YouTube video 👉 [**The Real Python Developer Roadmap**](https://www.youtube.com/watch?v=d5BzuLlII_Y&feature=youtu.be).
- It’s a long video but hang in there.
- It’s a really great video about what to learn in Python Programming and career options. (Trust me on this too😉)
**Who Am I?**
I’m Afraaz Ahmed, a Software Engineering Nerd who loves building Web Applications, now sharing my knowledge through Blogging during the busy time of my freelancing work life. Here’s the link to all of my socials categorized by platforms under one place: https://linktr.ee/afraazahmed
**Thank you** so much for reading my blog🙂.
---
If someone like me asked you this question now: "What is Python Programming Language?", Can you answer it?
Let me know your answer to this question in the comment section.
| afraazahmed |
1,876,132 | Ride the Waves of Success: Marine Rope Solutions by Shanghai Jinli Special Rope Co., Ltd | Ride the Waves of Triumph: Marine Rope Systems Are you searching for a reliable and rope strong your... | 0 | 2024-06-04T05:16:07 | https://dev.to/hdweyd_djjehhe_94b0dba4fc/ride-the-waves-of-success-marine-rope-solutions-by-shanghai-jinli-special-rope-co-ltd-1bj3 | Ride the Waves of Triumph: Marine Rope Systems
Are you searching for a reliable and rope strong your boating requirements? Search no further than Shanghai Jinli Special line Co., Ltd. Making use of their marine rope solutions, it is possible to drive the waves of success. Here are some for the reasons why. So let's dive right into it as we discussed it further all the information about it.
Advantages
Shanghai Jinli Special Rope Co., Ltd's marine rope solutions give you a array of benefits. Firstly, the ropes are manufactured from high-quality materials, which guarantees their durability and strength. Also, the ropes are created to be resistant to water and other harsh factors which can be environmental helping to make them extremely suitable for marine applications.
Innovation
Shanghai Jinli Special Rope Co., Ltd is a pioneer in the marine rope industry with regards to innovation. Their focus on developing new items and incorporating brand new technologies enables them to stay in front of the curve and offer their customers unique solutions that meet their needs being certain.
Safety
One of the primary issues in marine applications is safety. Shanghai Jinli Special Rope Co., Ltd takes safety seriously and it has developed their winch rope solutions being mindful of this. They use high-grade materials with properties that allow for an even high of. In addition, their ropes undergo rigorous evaluating to make certain they meet security standards.
Use
Marine rope solutions from Shanghai Jinli Special line Co., Ltd can be utilized for the selection of applications beyond just boating. Be it fishing, towing, or just about any application marine their synthetic winch rope offer the strength, quality, and durability that are needed for these tasks.
How to Use
Making use of marine ropes from Shanghai Jinli Special line Co., Ltd is not hard. Before use, it is critical to inspect the rope to make sure there are not any noticeable signs of use or damage. The braided winch rope should be precisely guaranteed to your vessel or other gear it's getting used with. During usage, it is vital to monitor the rope for signs of degradation or wear.
Application
Shanghai Jinli Special Rope Co., Ltd's marine rope solutions can be utilized in many different marine applications. They have been suited to use within fishing, sailing, towing, and more. Along with their consider innovation and quality, they have been constantly developing items that are brand new solutions to meet the evolving needs of the clients.
Source: https://www.cneema.com/application/winch-rope | hdweyd_djjehhe_94b0dba4fc | |
1,876,131 | Crafting Powerful Identities: How a Logo Can Elevate Your Brand | In today's crowded marketplace, a strong first impression is essential. Your logo is often the very... | 0 | 2024-06-04T05:15:50 | https://dev.to/green_pixelcreationpriv/crafting-powerful-identities-how-a-logo-can-elevate-your-brand-16h3 | logodesign, graphicdesign, branding, logo | In today's crowded marketplace, a strong first impression is essential. Your [logo](https://greenpixelscreations.com/logo-design) is often the very first touchpoint a potential customer has with your brand. It serves as a visual shorthand, instantly conveying your essence and values. But a logo is more than just aesthetics; it's a powerful tool that can elevate your brand and fuel its growth.
Here's how a well-crafted logo can work wonders for your brand:
**Instant Recognition:**
A memorable logo becomes instantly recognizable, building brand awareness and setting you apart from competitors. Think of the iconic swoosh of Nike or the bitten apple of Apple – these logos are instantly associated with their respective brands.
**Emotional Connection: **
A well-designed logo can evoke positive emotions and build trust with your audience. Consider the warm and inviting colors of a children's toy store logo or the sleek lines of a tech company logo – these elements subconsciously create associations with the brand's personality.
**Storytelling Power: **
A logo can be a powerful storytelling tool, encapsulating your brand's essence in a single image. Think of the hidden arrow in the FedEx logo, symbolizing speed and efficiency. A great logo sparks curiosity and invites viewers to learn more about your brand story.
**Brand Advocacy: **
A logo becomes a symbol your customers can proudly wear or display. Think of the iconic Harley-Davidson logo or the ubiquitous Starbucks mermaid – these logos are embraced by fans and become a badge of loyalty.
Investing in a professional logo design is an investment in your brand's future. A powerful logo is a cornerstone of a successful brand identity, attracting customers, fostering loyalty, and propelling your business forward. | green_pixelcreationpriv |
1,876,130 | Crafting Better Software | Let me preface this by saying I am extremely pedantic and opinionated on what quality code looks... | 0 | 2024-06-04T05:13:39 | https://dev.to/silent6stringer/crafting-better-software-3hf0 | coding, softwaredevelopment, beginners |
_Let me preface this by saying I am extremely pedantic and opinionated on what quality code looks like... I have been burned enough times to know._
## What do I know?
I have written and read a lot of complex and untested code over the years. I have had to maintain services and libraries that are so complex and have such poor coverage that understanding how they worked was nearly impossible. Most of my career has been focused on preventing and reducing complexity.
# Guidelines
In an effort to guide engineers who aspire to be better, I would like to offer some of the most important takeaways from my career. I hope you find use in them and can avoid burning yourself and others. Hopefully, you can avoid the mistakes that I have made and that cost me so dearly.
## Focus on Abstractions
The most important skill for you to develop to become a better crafter of software is building abstractions and grouping them together in a coherent way. Most young engineers I work with will write code with no structure or will revert to established principles and design patterns. The most common one I hear is DRY. I would argue that DRY is a side-effect of writing quality abstractions. It should not be a focus, it should be an outcome. You should be asking yourself questions like:
1. Does the code make sense? Does it do one thing?
2. Does the code effectively and concisely communicate one idea?
3. Is the code un-ambiguous? Can the engineer make sense of it without having to read too much?
## Good Software Has Layers
The best thing you can do as a software engineer is to spare your co-workers the pain of having to read more code than necessary to understand what is going on. The most effective way to do this is to introduce layers into your software. This should be done through modules. Doing this successfully means that someone can get a pretty good idea of what your software does just by looking at the directory structure.
Consider the following:
- /api
- /chartData
- /lib
- /shapes
- /pie
- /bar
- /line
- /dataProvider
- /timeSeriesDataFetcher
- /categoricalDataFetcher
- /db
By looking at this, you can get a pretty good idea of what to expect. There is an api that vends chart data. I expect the chartData API to use dataProviders to fetch data using a db client. The return types will probably be formatted into a pie, bar, or line shape.
Now consider this:
- /controller
- /customCharts
- schema
- /customChartSchema
- /customChartProvider
Notice how there is so much ambiguity? What is a controller? What charts are supported? Where does the data come from?
## Treat Tests as Records of Intention
Believe it or not, I have had to make a case for writing tests over code. I have encountered developers who do not think it is a valuable practice. I can see how some may hold this belief. Especially if you are at a super early-stage startup and you are one of two people writing code. However, I would say that tests should be treated as documentation. They document the expected behavior of code, which not only serves you but also the developers you hire onto your team. They will have less of a hard time understanding what the intent of the code is. That is also less time you have to take out of your day to explain your code to them.
## Document Modules
Whenever you write a module, document the abstractions it encompasses and how they interact together. This makes it very clear what a module does on a high-level. Some may argue that it is not worth writing documentation because things are just going to change anyway. I would argue that it is worth the extra 30 minutes. You save people way more than 30 minutes of their time. I know it is a chore, but there will never be a time you have the context of your code fresh in your mind. So get it down before you move on to the next thing.
### Parting Words
If you take one thing away from this, I would say shelter your co-workers from complexity. All your effort should be put into making code as intuitive and coherent as possible. Your peers should not be cursing at their screens or burying their face in their palms. That is a sign of failure. If you have any questions or criticisms, please leave comments.
| silent6stringer |
1,876,129 | Set Sail with Confidence: Marine Rope Supplies from Shanghai Jinli Special Rope Co., Ltd | f67df0f5ad778137f7ecd27964fb8965eda6b17a6ffb46fff75e39e2c015e24d.jpg Set Sail with Confidence:... | 0 | 2024-06-04T05:10:00 | https://dev.to/hdweyd_djjehhe_94b0dba4fc/set-sail-with-confidence-marine-rope-supplies-from-shanghai-jinli-special-rope-co-ltd-3cg6 | f67df0f5ad778137f7ecd27964fb8965eda6b17a6ffb46fff75e39e2c015e24d.jpg
Set Sail with Confidence: Marine Rope Supplies from Shanghai Jinli Special Rope Co., Ltd
You know how important it is to have the right equipment for a safe and memorable voyage if you a boater or a sailor. One of the most critical pieces of equipment on any vessel is the marine rope. Shanghai Jinli Special Rope Co., Ltd offers marine high-quality to help you set sail with confidence. We will discuss the advantages, innovations, safety, uses, and quality of marine ropes from Shanghai Jinli Special Rope Co., Ltd.
Advantages of Marine Ropes from Shanghai Jinli Special Rope Co., Ltd
Shanghai Jinli Special Rope Co., Ltd offers marine ropes durable, strong, and long-lasting. Our marine ropes have an capability exceptional withstand harsh weather conditions and strong tugs. In addition, our marine ropes made of high-quality materials resist water damage and mold, making them the choice ideal any boater or sailor. With our marine ropes, you can be sure a tool had by you reliable your boat.
Innovations in Marine Ropes
Shanghai Jinli Special Rope Co., Ltd is committed to advancing solutions innovative meet the ever-growing needs of our customers. Our marine heavy ropes are engineered from advanced technology processes guarantee strength, flexibility, and durability. We leverage cutting-edge technology to manufacture marine ropes light in weight, easy to coil, and offer performance maximum. Our ropes are designed to provide a bonding stable allows reliable use in the vessel environments harshest.
Safety Considerations
At Shanghai Jinli Special Rope Co., Ltd, we understand how safety is vital when it comes to marine applications. Our marine ropes are engineered to withstand the ocean tough, making them reliable and safe. They are also tested and certified adhering to safety international, including American Bureau of Shipping (ABS), Det Norske Veritas (DNV), and Germanischer Lloyd (GL). Our marine ropes have no sharp edges or splinters, enhancing safety on your boat.
Uses of Marine Ropes
Shanghai Jinli Special Rope Co., Ltd's marine ropes are suitable and versatile for various marine applications. Our synthetic winch rope can be used as anchor ropes, mooring lines, towing lines, and hawsers, among others. We also offer customized ropes to match needs specific applications such as buoyancy, weight bearing, and shock absorption. Our team of experts can work with you to design marine ropes meet your requirements unique.
How to Use Marine Ropes
Shanghai Jinli Special Rope Co., Ltd's marine ropes are easy to use and require care standard maintenance to keep them in good condition. Before using the ropes, check for any damages such as twists, kinks, or cuts. Ensure you store the ropes in a dry, cool place and where the coils cannot get tangled. When using the ropes, make sure you know their weight-bearing capabilities and follow proper techniques for handling and rigging.
Quality Assurance
Shanghai Jinli Special Rope Co., Ltd is dedicated to marine providing high-quality meet or exceed customer expectations. Our ropes are manufactured quality using premium and to stringent quality standards. Our production process has quality checks at every stage, ensuring our products reliable, safe, and durable. Our products come with a warranty, and a customer had with any queries by us service team to assist you.
Application of Marine Ropes
Marine ropes are from Shanghai Jinli Special Rope Co., Ltd have various applications ranging from pleasure boats, rigs, fishing vessels, offshore oil platforms, and marine wind power generation systems, among others. Our high-quality marine winch rope provide reliable support for offshore operations, and our customized ropes have enabled the completion successful of marine projects.
Source: https://www.cneema.com/application/synthetic-winch-rope | hdweyd_djjehhe_94b0dba4fc | |
1,876,128 | What's with the Weird Elixir Function Names | Have you ever noticed that in all of the documentation related to Elixir, functions are referenced... | 0 | 2024-06-04T05:08:28 | https://davidturissini.com/blog/whats-with-the-weird-elixir-function-names/ | elixir, webdev, beginners | Have you ever noticed that in all of the documentation related to Elixir, functions are referenced like `function_name/2`? This is by design- Elixir itself identifies functions by [its name and the number of arguments it takes](https://hexdocs.pm/elixir/basic-types.html#identifying-functions-and-documentation). The documentation, in turn, follows suite.
So, whenever you see Elixir docs (or, ahem, error pages) referencing `function_name/2`, you will know that it's referencing `function_name` that accepts 2 arguments.
| daveturissini |
1,876,127 | Quick tip: Type of tokio spawn return | When I was implementing the metrics task using tokio, I wanted to save the result JoinHandle in a... | 0 | 2024-06-04T05:07:27 | https://dev.to/thiagomg/quick-tip-type-of-tokio-spawn-return-42i3 | rust, tokio, programming | When I was implementing the metrics task using tokio, I wanted to save the result `JoinHandle` in a struct and I saw the type being displayed by the IDE: `JoinHandle<?>`
What does it mean?
When I looked the definition of the function spawn, that's the code:
```rust
pub fn spawn<F>(future: F) -> JoinHandle<F::Output>
where
F: Future + Send + 'static,
F::Output: Send + 'static,
{
// ...
```
In the Future trait, `F::Output` refers to the return value of the input function.
Now, the piece of code I have is a long running task. That is the piece of code.
```rust
let receiver_task = tokio::spawn(async move {
println!("Starting metrics receiver");
while let Some(event) = rx.recv().await {
if let Err(e) = metrics.add(&event.post_name, &event.origin) {
error!("Error writing access metric for {}: {}", &event.post_name, e);
} else {
debug!("Metric event written for {}", &event.post_name);
}
}
});
```
As this function returns nothing, the type is [Unit](https://doc.rust-lang.org/std/primitive.unit.html), hence for this lambda I can declare my struct as:
```rust
pub struct MetricHandler {
receiver_task: JoinHandle<()>,
//...
}
```
And now you can do:
```rust
let receiver_task = tokio::spawn(async move {
// ...
MetricHandler {
receiver_task,
// ...
}
```
| thiagomg |
1,876,126 | Order Food Online: Mastering A Guide to Apps and Tech | Order Food Online: Mastering A Guide to Apps and Tech Online meal ordering has ingrained... | 0 | 2024-06-04T05:02:50 | https://dev.to/adambaba/order-food-online-mastering-a-guide-to-apps-and-tech-2oa5 | coding, programming | ## Order Food Online: Mastering A Guide to Apps and Tech
Online meal ordering has ingrained itself into our daily lives. Whether you're craving sushi at midnight or want a healthy salad for lunch, the convenience of having meals delivered right to your doorstep is unbeatable. If you're new to this, don't worry! This ultimate guide will walk you through everything you need to know about ordering food online.
## Why Order Food Online?
First off, let's talk about why ordering food online is so popular.
> It's not just about convenience; it's also about variety and ease.
## Convenience at Your Fingertips
Imagine this: You are comfortably settled at home and wish to avoid the inconvenience of going out to obtain food. This situation exemplifies the advantages of online food delivery services. With a few interactions on your mobile device, you can effortlessly arrange for your preferred meal to be delivered directly to your residence, eliminating the need to leave your comfortable environment.
For users it is easy to access but in the backend it needs lots of processing and coding to build the best app, so it provides a user-friendly experience.
## Plethora of Choices
Online meal delivery services provide a multitude of choices. From local eateries to international cuisines, the choices are endless. Whether you're in the mood for Italian, Chinese, or even something more exotic, there's something for everyone.
**_Time-Saving_**
For busy professionals and parents, ordering food online is a time-saver. Instead of spending time cooking or waiting at a restaurant, you can have your meal delivered while you focus on more important tasks.
## How to Order Food Online
Now that you know why online food delivery is so popular, let's dive into how to do it. It's simpler than you might think!
-
**_Step 1: Choose Your Platform_**
The first step is choosing a food delivery platform. There are many apps and websites available that offer delivery services from various restaurants. Browse through a few options and see which one suits your needs best.
-
**_Step 2: Browse the Menu_**
Once you've chosen your platform, it's time to browse the menu. Most platforms have an easy-to-navigate menu with all the available options. Take your time to explore and find something that tickles your taste buds.
-
**_Step 3: Place Your Order_**
After deciding on your meal, add it to your cart. Make sure to check the details and customise your order if needed. Many platforms allow you to add special instructions or notes for the restaurant.
-
**_Step 4: Make Payment_**
Next, proceed to the payment section. Most platforms offer various payment methods, including credit cards, debit cards, and digital wallets. Choose the one that's most convenient for you and complete the transaction. With this, secure platforms are end-to-end encrypted, guaranteeing security of your personal data.
**_Step 5: Track Your Order_**
Once your order is placed, you can usually track its progress through the app. This feature allows you to see when your food is being prepared, when it's out for delivery, and when it's about to arrive at your location.
## Tips for a Smooth Online Food-Ordering Experience
Ordering food online is straightforward, but here are some tips to make the experience even smoother.
**_Check Reviews and Ratings_**
Before placing an order, check the reviews and ratings of both the restaurant and the specific dish you're interested in. This can help you avoid disappointing meals and ensure you get the best quality food.
**_Look for Discounts and Offers_**
Many food delivery platforms offer discounts and promotions. Keep an eye out for these deals to save some money on your orders. Signing up for newsletters or loyalty programmes can also give you access to exclusive offers.
**_Be Mindful of Delivery Times_**
Delivery times can be longer during peak hours. If you're in a hurry, try ordering during off-peak times to get your food faster. Additionally, some platforms allow you to schedule deliveries in advance so you can have your meal delivered precisely when you need it.
**_Customise Your Order_**
Feel free to customise your order to suit your preferences. Whether you want extra cheese on your pizza or prefer your salad without onions, most restaurants are happy to accommodate special requests.
## Common Pitfalls and How to Avoid Them
Even with the best platforms, sometimes things go differently than planned. Here are some common pitfalls and how to avoid them.
**_Wrong Orders_**
Receiving the wrong order can be frustrating. To minimise this risk, double-check your order details before finalising the purchase. If you do receive the wrong order, contact customer
service immediately for a resolution.
**_Delayed Deliveries_**
While delays can happen, especially during busy times, tracking your order can help you stay updated. If your delivery is significantly delayed, don't hesitate to contact the support team for assistance.
**_Quality Issues_**
If the food quality needs to be better, most platforms have a feedback system. Use it to report any issues and seek a refund or replacement if necessary. Sharing your experience helps improve the service for everyone.
## Benefits of Online Food Delivery
Apart from the convenience and variety, there are several other benefits to using online food delivery services.
_**Safety and Hygiene**_
Safety and hygiene are paramount, especially in today's world. Online food delivery platforms often adhere to strict hygiene standards, ensuring that food is prepared and delivered safely.
**_Supporting Local Businesses_**
[Order food online](https://www.swiggy.com/) is a great way to support local restaurants and businesses. Many small eateries rely on online orders to sustain their operations, so your order can make a big difference.
**_Access to Exclusive Deals_**
Many restaurants offer exclusive deals and combos through online delivery platforms. These deals are often not available for dine-in customers, so you get more value for your money.
## Conclusion: Ready to Dive In?
Ordering food online is a game-changer. It's convenient, offers a world of choices, and can save you precious time. By following the steps and tips outlined in this guide, you'll be well on your way to becoming a pro at online food delivery.
Remember, whether you're craving a quick snack or planning a family dinner, the ease of having delicious food delivered to your door is just a few clicks away. Happy eating!
When you're ready to order, keep this guide handy. When you do, consider trying out and learning the brand name for a seamless and delightful experience.
| adambaba |
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1,876,124 | Navigate the Waves: Marine Rope Excellence by Shanghai Jinli Special Rope Co., Ltd | f67df0f5ad778137f7ecd27964fb8965eda6b17a6ffb46fff75e39e2c015e24d.jpg Introduction: Shanghai Jinli... | 0 | 2024-06-04T04:59:26 | https://dev.to/darlene_ballardg_27f941ff/navigate-the-waves-marine-rope-excellence-by-shanghai-jinli-special-rope-co-ltd-34ik | design, product | f67df0f5ad778137f7ecd27964fb8965eda6b17a6ffb46fff75e39e2c015e24d.jpg
Introduction:
Shanghai Jinli Special Rope Co., Ltd is a continuous company that creates quality marine top. The company has been creating ropes for years, and it known for its level high of, safety, and quality. The Navigate the Waves Marine fishing rope Excellence among their flagship items, and it has advantages lots of other ropes in the marketplace.
Advantages:
The Waves Marine Rope Excellence is its toughness among the advantages of Navigate. The rope is made of top quality products can endure the pressure of solid waves and winds. This makes it appropriate for use in severe marine environments. Furthermore, the rope has a degree high of to abrasion, which ensures it can be used for a right time long getting damaged.
Innovation:
The Navigate the Waves Marine Rope Excellence is an item that has innovative designed with the newest technology. The rope was crafted to be flexible and easy to handle, which makes it appropriate for various marine applications. Furthermore, the rope is light-weight, which makes it easy to handle and store.
Safety:
Safety is a factor to consider that's important when it comes to heavy ropes marine. The Navigate the Waves Marine Rope Excellence was designed with safety in mind. A degree had by the rope high of, which ensures it doesn't snap or recover cost under high tension. Furthermore, the rope was designed to be easy to handle, which lowers the risk of accidents and injuries.
Use:
The Navigate the Waves Marine Rope Excellence can be used for a range wide of in the marine industry. The rope is appropriate for use in mooring, towing, and anchoring. Furthermore, it can be used on watercrafts of various sizes, consisting of boats yachts small and vessels large. The rope is appropriate for use in various environments marine consisting of saltwater and freshwater.
How to use:
The Waves Marine Rope Excellence, start by choosing the rope appropriate for your application to use the Navigate. The rope is available in various sizes, lengths, and toughness. Next, connect the rope for your watercraft or the object you want to tow support or. Ensure the rope is properly secured and there no tension on the rope before you begin using it. When not being used, store the rope in a place damage prevent dry.
Service:
Shanghai Jinli Special Rope Co., Ltd is dedicated to service providing excellent for its customers. The company has a group of skilled experts can provide support advice customers technological. Furthermore, the company ongoing a guarantee on all its items, consisting of the Navigate the Waves Marine Rope Excellence. You can contact the company support ongoing you have actually any problems with the product.
Quality:
The Navigate the Waves Marine winch rope Excellence is an item that the quality was produced to the highest standards. The rope is made of top quality products resistant to abrasion and rust. Furthermore, the rope was evaluated to ensure the safety met by it required.
Application:
The Navigate the Waves Marine Rope Excellence appropriates for use in various marine applications. The rope can be used for mooring, towing, and anchoring. Furthermore, it can be used on boats of various sizes and in various environments marine. The rope is also appropriate for use in various weather, consisting of waves winds strong. | darlene_ballardg_27f941ff |
1,876,123 | Rust vs Typescript Variables | Jumping into Rust from Typescript requires that you change the way you think about code. A... | 0 | 2024-06-04T04:58:35 | https://davidturissini.com/blog/rust-vs-typescript-variables/ | rust, typescript, webdev, beginners |
Jumping into Rust from Typescript requires that you change the way you think about code.
## A Simple Log Statement
It is trivial to log a variable Typescript. Simply declare the variable and then pass it `console.log`. This is totally fine:
```ts
let value = 'string';
console.log(value);
```
It doesn't really matter what happens between the variable declaration and the log statement. The output will be logged as expect. For example, this is _also_ perfectly fine:
```ts
let value = 'string';
let otherValue = value;
console.log(value);
```
In both of these examples, `value` is declared and then logged. There is nothing surprising here. In order to get this same functionality in Rust, we have to change our approach and the way we are thinking about the code.
## Ownership
What happens if you do this in Rust?
```rust
let value = String::from("string");
let otherValue = value;
println!("{}", value);
```
It certainly looks like `value` will be logged, but what you actually get is a super fun compiler error:
```
move occurs because `value` has type `std::string::String`, which does not implement the `Copy` trait
```
When it comes to variable assignments, Rust and Typescript come from completely different planets. In Typescript, it's perfectly fine to create variables, reassign them, and, in most cases, mutate them. You don't need to think about heaps, stacks, or how memory is cleaned up after the fact. The runtime handles all of that for you.
Rust, on the other hand, _requires_ you to think about memory allocation, how you are accessing that memory, and how that memory gets cleaned up (sort of).
In the Rust code above, we create a `String` and assign it to the variable `value`. `value` now "owns" that string and, in Rust, values are only allowed to have one owner.
When we assign `value` to `otherValue`, we aren't just copying the value or creating a reference to it like we would be doing in Typescript. Instead, we are transfering ownership or moving the `String` to `otherValue`. After the value is moved, we are no longer allowed to reference `value`, and how could we? It no longer owns anything!
## Borrowing
Fortunately, changing "ownership" isn't the only way to assign values in Rust. Instead of changing ownership, we can have `otherValue` "borrow" `value`. All we need to do is add a `&` to the assignment:
```rust
let value = String::from("string");
let otherValue = &value; // Borrowing!
println!("{}", value);
```
Instead of taking full ownership of `value`, `otherValue` creates a pointer that points to the value of `value`, which in this case is `String::from("string")`. Because `otherValue` is simply borrowing `value`, we are free to continue referencing `value` further along in our code.
| daveturissini |
1,876,122 | Answer: How to print __int128 in g++? | answer re: How to print __int128 in g++? ... | 0 | 2024-06-04T04:58:07 | https://dev.to/mdsiaofficial/answer-how-to-print-int128-in-g-3mki | {% stackoverflow 78573447 %} | mdsiaofficial | |
1,876,121 | Shanghai Jinli Special Rope Co., Ltd: Your Off-Road Towing Expertise | f67df0f5ad778137f7ecd27964fb8965eda6b17a6ffb46fff75e39e2c015e24d.jpg Shanghai Jinli Special Rope Co.,... | 0 | 2024-06-04T04:57:39 | https://dev.to/darlene_ballardg_27f941ff/shanghai-jinli-special-rope-co-ltd-your-off-road-towing-expertise-1cb3 | design, product | f67df0f5ad778137f7ecd27964fb8965eda6b17a6ffb46fff75e39e2c015e24d.jpg
Shanghai Jinli Special Rope Co., Ltd: Your Off-Road Towing Expertise
Areyou looking for a safe and way reliable tow your off-road vehicle? Look no further than Shanghai Jinli Special Rope Co., Ltd. We are your go-to experts for all things towing off-road.
Advantages:
Our ropes are made with high-quality materials and designed to handle recovery rope even the toughest conditions off-road. Durability is you need whether you are towing through sand, mud, or rocky terrain, our ropes will provide the strength and.
Innovation:
At Shanghai Jinli Special Rope Co., Ltd, we are always looking for ways to improve our products and stay on the edge cutting of. We use the manufacturing techniques latest and materials to create the best product possible our customers.
Safety:
Safety is our number one priority. That's why all of our ropes rigorously tested to ensure the safety met by them standards highest. You can rest assured you use one of our ropes to tow your off-road vehicle you using a product has been designed with your safety in mind when.
Use:
Our ropes are perfect for off-road enthusiasts who need a real way reliable tow their vehicles. We have a rope that will work for you whether you towing a heavy-duty truck or a small ATV. Our ropes are also great for use in industrial settings, such as towing equipment heavy.
How to use:
Using one of our ropes couldn't be easier. Simply attach the spectra winch rope to your vehicle using the included hardware, and you're ready to go. Be sure to follow our safety guidelines and use the rope appropriate sized your vehicle.
Service:
At Shanghai Jinli Special Rope Co., Ltd, we pride ourselves on our customer exceptional service. We are always available to answer any questions you may have about our ropes, and we are committed to providing you with the experience best possible.
Quality:
We believe quality is the most factor important creating a product our customers can trust. That's why we use only the best materials and processes manufacturing create our heavy ropes. We stand behind our products and confident you shall be satisfied with your purchase.
Application:
Our ropes are versatile and can be used in a variety of different settings. We have a product will work for you whether you towing a vehicle off-road or using our ropes in an industrial setting. Our ropes are also great for use in rescue operations, such as pulling vehicles out of ditches or off of cliffs. | darlene_ballardg_27f941ff |
1,876,120 | LWC Batch Class Progress Indicator, Data Cloud Tips, Account Teams Best Practices | This is a weekly newsletter of interesting Salesforce content See the most interesting... | 25,293 | 2024-06-04T04:57:22 | https://dev.to/sfdcnews/lwc-batch-class-progress-indicator-data-cloud-tips-account-teams-best-practices-1g74 | salesforce, salesforcedevelopment, salesforceadministration, salesforceadmin | # This is a weekly newsletter of interesting Salesforce content
See the most interesting #Salesforce content of the last days 👇
✅ **[5 Tips for Getting Started with Data Cloud](https://admin.salesforce.com/blog/2024/5-tips-for-getting-started-with-data-cloud)**
As an admin, you've probably heard of Data Cloud, but maybe you haven't prioritized it right away because you have other company challenges to address. Well, now's the time to move Data Cloud to the top and dig in. If you're thinking, "What is Data Cloud? Can you break it down for me?", you're in the right place.
✅ **[Best Practices for Using Salesforce Account Teams](https://www.salesforceben.com/best-practices-for-using-salesforce-account-teams/)**
In the past, the writer had reservations about the limitations of the "Account Teams" feature. However, recent upgrades have transformed it into a versatile tool applicable to Sales Cloud and Service Cloud. This article explores the new functionalities and best practices associated with Account Teams.
✅ **[Batch Class Progress Indicator In LWC](https://salesforcediaries.com/2023/01/09/batch-class-progress-indicator-in-lwc/)**
A batch class can be invoked dynamically from LWC. A progress indicator for the batch class is being built. Users can monitor or stop batch Apex job execution by accessing Apex Jobs in Setup. However, some users may not have view setup permission, so a way to view the progress indicator directly in LWC is being provided.
✅ **[Salesforce Fact #528 | Find out permission set assignments](https://sfactsabhishek.blogspot.com/2022/10/salesforce-fact-528-find-out-permission.html)**
Do you know there is an Sobject in Salesforce called 'PermissionSetGroupComponent' which keeps track of the permission set assignments in permission set groups. Suppose, we need to find out a particular permission set is assigned to which permission set groups. To get this, we can query on this object.
✅ **[Understanding JWT-Based Access Tokens in Salesforce](https://sfdclesson.com/2023/08/30/understanding-jwt-based-access-tokens-in-salesforce/)**
In Salesforce org integration, access tokens are crucial for granting application access to Salesforce resources. This blog post explores the advantages, structure, and enabling of JSON Web Token (JWT)-based access tokens. Salesforce offers opaque tokens and JWT-based access tokens, with the latter being in the form of a JSON object for easy authorization. This transparency allows for efficient authorization processes.
Check these and other manually selected links at https://news.skaruz.com
Click a Like button if you find it useful.
Thanks.
| sfdcnews |
1,876,119 | Buy verified cash app account | https://dmhelpshop.com/product/buy-verified-cash-app-account/ Buy verified cash app account Cash... | 0 | 2024-06-04T04:55:32 | https://dev.to/yetolo9323/buy-verified-cash-app-account-20ld | webdev, javascript, beginners, programming | ERROR: type should be string, got "https://dmhelpshop.com/product/buy-verified-cash-app-account/\n\n\n\n\nBuy verified cash app account\nCash app has emerged as a dominant force in the realm of mobile banking within the USA, offering unparalleled convenience for digital money transfers, deposits, and trading. As the foremost provider of fully verified cash app accounts, we take pride in our ability to deliver accounts with substantial limits. Bitcoin enablement, and an unmatched level of security.\n\nOur commitment to facilitating seamless transactions and enabling digital currency trades has garnered significant acclaim, as evidenced by the overwhelming response from our satisfied clientele. Those seeking buy verified cash app account with 100% legitimate documentation and unrestricted access need look no further. Get in touch with us promptly to acquire your verified cash app account and take advantage of all the benefits it has to offer.\n\nWhy dmhelpshop is the best place to buy USA cash app accounts?\nIt’s crucial to stay informed about any updates to the platform you’re using. If an update has been released, it’s important to explore alternative options. Contact the platform’s support team to inquire about the status of the cash app service.\n\nClearly communicate your requirements and inquire whether they can meet your needs and provide the buy verified cash app account promptly. 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Consider obtaining a verified Cash App account for seamless transactions, especially for business purposes. Buy verified cash app account. Purchase Verified Cash App Accounts.\n\nSelecting a username in an app usually comes with the understanding that it cannot be easily changed within the app’s settings or options. This deliberate control is in place to uphold consistency and minimize potential user confusion, especially for those who have added you as a contact using your username. In addition, purchasing a Cash App account with verified genuine documents already linked to the account ensures a reliable and secure transaction experience.\n\n \n\nBuy verified cash app accounts quickly and easily for all your financial needs.\nAs the user base of our platform continues to grow, the significance of verified accounts cannot be overstated for both businesses and individuals seeking to leverage its full range of features. 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Buy verified cash app account.\n\nTrustbizs.com stands by the Cash App’s superiority and recommends acquiring your Cash App accounts from this trusted source to optimize your business potential.\n\nHow Customizable are the Payment Options on Cash App for Businesses?\nDiscover the flexible payment options available to businesses on Cash App, enabling a range of customization features to streamline transactions. Business users have the ability to adjust transaction amounts, incorporate tipping options, and leverage robust reporting tools for enhanced financial management.\n\nExplore trustbizs.com to acquire verified Cash App accounts with LD backup at a competitive price, ensuring a secure and efficient payment solution for your business needs. Buy verified cash app account.\n\nDiscover Cash App, an innovative platform ideal for small business owners and entrepreneurs aiming to simplify their financial operations. 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It is always wise to prioritize caution and explore alternative avenues if uncertainties arise.\n\nThe Importance Of Verified Cash App Accounts\nIn today’s digital age, the significance of verified Cash App accounts cannot be overstated, as they serve as a cornerstone for secure and trustworthy online transactions.\n\nBy acquiring verified Cash App accounts, users not only establish credibility but also instill the confidence required to participate in financial endeavors with peace of mind, thus solidifying its status as an indispensable asset for individuals navigating the digital marketplace.\n\nWhen considering purchasing a verified Cash App account, it is imperative to carefully scrutinize the seller’s pricing and payment methods. Look for pricing that aligns with the market value, ensuring transparency and legitimacy. Buy verified cash app account.\n\nEqually important is the need to opt for sellers who provide secure payment channels to safeguard your financial data. Trust your intuition; skepticism towards deals that appear overly advantageous or sellers who raise red flags is warranted. It is always wise to prioritize caution and explore alternative avenues if uncertainties arise.\n\nConclusion\nEnhance your online financial transactions with verified Cash App accounts, a secure and convenient option for all individuals. By purchasing these accounts, you can access exclusive features, benefit from higher transaction limits, and enjoy enhanced protection against fraudulent activities. Streamline your financial interactions and experience peace of mind knowing your transactions are secure and efficient with verified Cash App accounts.\n\nChoose a trusted provider when acquiring accounts to guarantee legitimacy and reliability. In an era where Cash App is increasingly favored for financial transactions, possessing a verified account offers users peace of mind and ease in managing their finances. Make informed decisions to safeguard your financial assets and streamline your personal transactions effectively.\n\nContact Us / 24 Hours Reply\nTelegram:dmhelpshop\nWhatsApp: +1 (980) 277-2786\nSkype:dmhelpshop\nEmail:dmhelpshop@gmail.com" | yetolo9323 |
1,876,118 | A Developer's Guide to Boosting Ecommerce Sales: From Code to Checkout Success | Ecommerce isn't just about having a flashy website or the latest product; it's about crafting a... | 0 | 2024-06-04T04:54:44 | https://dev.to/elena143/a-developers-guide-to-boosting-ecommerce-sales-from-code-to-checkout-success-4p3h | Ecommerce isn't just about having a flashy website or the latest product; it's about crafting a digital experience that seamlessly guides shoppers from browsing to buying.
And as a developer, you're not just building a site, you're engineering that entire journey.
This guide is your roadmap to optimizing that journey, not just for any sale, but for increased sales that truly impact your bottom line.
### 1. The Foundation: A Blazing-Fast, Responsive Website
Think of your website as a physical store. Would you shop somewhere with flickering lights, narrow aisles, and unhelpful staff?
Probably not. Similarly, online shoppers demand a smooth, intuitive experience. Here's how your code can deliver:
**Prioritize Page Speed: **Every second counts. Implement caching, image optimization, and lazy loading to ensure snappy load times across devices. Use tools like Google PageSpeed Insights to pinpoint and fix bottlenecks.
**Embrace Responsive Design:** Your site needs to adapt seamlessly to various screen sizes. Think mobile-first, ensuring optimal viewing and interaction on smartphones and tablets.
**
Intuitive Navigation: **Make it easy for users to find what they're looking for. Implement clear categories, a powerful search bar with autocomplete, and breadcrumb navigation.
### 2. The Enticing Display: Product Pages That Convert
Product pages are your virtual salespeople.
They need to showcase your offerings in their best light and answer potential questions before they arise.
Here's how to make them shine:
**High-Quality Images and Videos: **Use crisp, zoomable images from multiple angles. Consider 360-degree views or product videos to provide a comprehensive look.
**Detailed Descriptions:** Go beyond basic specs. Highlight benefits, use cases, and unique selling points. Incorporate relevant keywords for SEO, but prioritize readability and persuasiveness.
**Customer Reviews and Ratings:** Social proof is powerful. Display authentic reviews prominently, and enable customers to filter by ratings or keywords.
### 3. The Seamless Path: A Frictionless Checkout Process
You've got the shopper hooked, now it's time to reel them in.
But a clunky checkout can lead to abandoned carts and lost sales. Streamline the process with these tactics:
Guest Checkout: Don't force account creation.
Offer a guest checkout option for quick purchases.
**Multiple Payment Options:** Cater to diverse preferences. Accept credit cards, digital wallets (PayPal, Apple Pay, etc.), and even consider buy now, pay later options.
**Progress Indicators:** Show shoppers where they are in the checkout process. A clear visual guide can reduce anxiety and prevent drop-offs.
### 4. The Personal Touch: Recommendation Engines and Personalized Offers
Modern shoppers expect a tailored experience. L
everage data and algorithms to provide recommendations and offers that resonate:
**Recommendation Engine:** Analyze browsing and purchase history to suggest relevant products. Implement "Frequently Bought Together" or "Customers Also Viewed" sections.
**Personalized Offers:** Use customer data to send targeted discounts or promotions. For example, [offer a discount](https://wisernotify.com/blog/limited-time-offers/) on a complementary product to a recent purchase.
**
Email Marketing: **Segment your email list and send personalized campaigns based on interests and behavior. Welcome new subscribers with a special offer.
### 5. The Ongoing Optimization: A/B Testing and Data-Driven Decisions
Your work doesn't end with launch.
Continuously test and refine your site to [maximize conversions](https://dev.to/elena143/learn-cro-for-developers-2024-2025-oj0).
**
A/B Testing:** Experiment with different layouts, colors, calls to action, and product descriptions. Use tools like Google Optimize to measure results and implement winning variations.
**Data Analysis:** Dive into your website analytics. Identify high-bounce pages, popular products, and customer demographics. Use these insights to inform your development and marketing strategies.
### 6. The Extra Mile: Going Beyond the Basics
To truly stand out, consider these advanced strategies:
**Augmented Reality (AR): **Allow customers to virtually "try on" products or see how furniture would look in their homes.
**Chatbots and Live Chat:** Provide instant support to answer questions and guide shoppers.
**Loyalty Programs: **Reward repeat customers with exclusive discounts or early access to new products.
### Conclusion
Developers are the unsung heroes of ecommerce success. Your code can create a captivating shopping experience that drives sales and fosters customer loyalty.
By focusing on speed, responsiveness, personalization, and data-driven optimization, you can transform your ecommerce site into a well-oiled sales machine. So, embrace the challenge, keep learning, and watch your conversions soar! | elena143 | |
1,876,115 | Simplifying Authentication with JWT, TypeScript and Fastify | Authentication is the process of confirming the identity of a user, typically through credentials... | 0 | 2024-06-04T04:54:23 | https://dev.to/sraveend/simplifying-authentication-with-jwt-typescript-and-fastify-1dc9 | typescript, beginners, programming, tutorial | Authentication is the process of confirming the identity of a user, typically through credentials like a username and a password.
Authorization, determines if a user is permitted to perform an action, once their identity is authenticated.
JWT or JSON Web Token plays a crucial role in authentication and authorization process. It is an efficient and scalable solution for implementing secure authentication and authorization mechanisms in web applications. Learn more here: [JWT](https://jwt.io/introduction).
This article demonstrates a simple way to implement authentication using JWT with TypeScript and fastify. For the database, I have Postgres and Prisma as the ORM(Object Relational Mapper) tool.
## **Getting Started**
Follow the instructions provided in the github repository to setup the project: [auth-demo](https://github.com/sreeharsha-rav/typescript-projects/tree/main/auth-demo).
**Highlights**
It's always import to store passwords by encrypting them before writing them to the database. I have done it using `bcrypt` and a simple salt value of 10 without any algorithm to hash the user password, during registration.
```js
// src/modules/user/user.controller.ts
const newUser = await prismaClient.user.create({
data: {
username,
password: await bcrypt.hash(password, 10),
},
});
```
How to check the password during login? Since the salt value is private to the program, for any user request, the user can be authenticated by comparing the password with the encrypted password using `bcrypt` as well:
```js
// src/modules/user/user.controller.ts
// Compare the password
const isValidPassword = await bcrypt.compare(password, user.password);
```
It's surprisingly quite simple to do a minimal secure authentication with JWT using `fastify-jwt` plugin. This code in `index.ts` registers the `fastify-jwt` plugin with `secret` . This `secret` is used to sign and verify the JWTs. Ideally, for the most secure option you would generate a secret using an asymmetric algorithms like RS256, ES256 etc.
```js
// src/index.ts
app.register(fastifyJwt, {
secret: process.env.JWT_SECRET || "supersecret",
});
```
To generate a JWT token, once a valid user request for login comes through, the JWT toke is generate using a payload. In this program the payload is the user id and the username. You don't want to put the password in the payload because JWTs can be decoded.
```js
// Generate a token
const payload = {
id: user.id,
username: user.username,
};
const token = request.server.jwt.sign(payload);
validTokens.add(token); // Store the token in the in-memory store
```
I setup an in-memory store for valid tokens using a HashSet for simplicity because it's a backend service. Ideally, would be managed on the client side. It enables the functionality of logging out, because of removing the appropriate token from the store. In `user.controller.ts`:
```js
// src/modules/user/user.controller.ts
// In memory store to store the refresh tokens
const validTokens = new Set<string>();
.
.
.
// Remove the token from the in-memory store to logout user
validTokens.delete(token);
```
To verify if the user is authenticated, it's a simple call from the `FastifyRequest` in the controller:
```js
// src/modules/user/user.controller.ts
await request.jwtVerify(); // Verify the JWT token
```
Additionally, I added further checks to see if the authorization header is present along with token when authenticating user as well as during logging out for more control.
**Further Thoughts**
Using JWT tokens provides a basic security to secure API endpoints, however with current trends in security, OAuth 2.0 and MFA is the standard.
Storing tokens in-memory for logout functionality is a simple workaround for the backend. In practice, it would be the up to the frontend client application to manage and store JWT tokens to maintain User session.
## **Conclusion**
Authentication need not be complex for getting a proof of concept. With in-demand skills like Typescript and a simple framework like Fastify, you can streamline the process. This article provides a foundation for authentication in beginner applications.
| sraveend |
1,876,117 | Air Tanks: Supporting Air Horns and Emergency Brake Systems in Vehicles | Sky Storage containers: The Trick towards Risk-free as well as Dependable Car Bodies Sky storage... | 0 | 2024-06-04T04:51:02 | https://dev.to/brenda_hernandezg_26bd74a/air-tanks-supporting-air-horns-and-emergency-brake-systems-in-vehicles-ap4 | air, tanks |
Sky Storage containers: The Trick towards Risk-free as well as Dependable Car Bodies
Sky storage containers are essential elements in contemporary cars, as well as they participate in a crucial function in guaranteeing security as well as dependability. Along with the enhancing variety of cars when driving, it has actually end up being necessary to have actually effective stopping as well as emergency situation bodies that can easily assist avoid mishaps as well as decrease damages. Sky storage containers are actually developed towards sustain these bodies, offering the required atmospheric pressure towards run sky horns as well as emergency situation brakes. we will get a better take a check out sky storage containers as well as their function in sustaining security functions in cars
Benefits of Utilizing Sky Storage containers
Among the primary benefits of utilization Air Tank containers in cars is actually their dependability. Unlike various other bodies that depend on electric energy or even various other types of power, sky storage containers are actually developed to become self-sufficient. They need no outside energy towards work as well as can easily remain to run also when various other bodies stop working
Another benefit of sky storage containers is actually their resilience. They are actually developed towards endure severe problems as well as can easily endure the wear-and-tear of everyday utilize. This creates all of them a suitable option for cars that run in severe atmospheres as well as go through harsh dealing with
Development in Sky Storage container Innovation
Recently,Stainless Steel Air Tank considerable development has actually occurred in sky storage container innovation. Brand-brand new products as well as production methods have actually been actually designed that create sky storage containers much a lot extra effective, lighter, as well as much a lot extra resilient. Today's sky storage containers are actually developed towards make the most of air flow as well as decrease squander, creating all of them much a lot extra eco-friendly compared to ever
Security Factors to consider for Sky Storage containers
Among one of the absolute most crucial elements to think about when utilizing sky storage containers is actually security. Sky storage containers should be actually inspected routinely for leakages as well as damages, as well as stringent quality assurance steps should remain in location towards guarantee their dependability. They should likewise be actually set up as well as utilized properly to avoid mishaps or even damages
Ways to Utilize Sky Storage containers
Towards utilize a sky storage container in a car, it should be actually linked towards the sky compressor as well as various other appropriate bodies. This procedure needs cautious setup as well as a functioning understanding of the vehicle's sky body. It is essential towards comply with producer standards thoroughly as well as speak with an expert towards guarantee appropriate setup
Solution as well as Upkeep for Sky Storage containers
Such as various other component of a car, Aluminum Air Tank containers need routine upkeep towards guarantee ideal efficiency. This consists of routine evaluations for leakages as well as damages, in addition to cleansing as well as lubrication. It is essential towards comply with producer suggestions for solution as well as upkeep towards guarantee the durability of the sky storage container as well as avoid mishaps or even damages
Request of Sky Storage containers in Cars
Sky storage containers have actually a wide variety of requests in cars, consisting of sustaining emergency situation brakes as well as sky horns. Emergency situation brakes are actually developed to hold a car rapidly in case of an emergency situation, while sky horns could be utilized towards caution others of risk or even towards suggest a driver's existence. Sky storage containers are actually crucial elements in each of these bodies, offering the required atmospheric pressure towards run all of them
Source: https://www.youchengzhixin.com/air-tank | brenda_hernandezg_26bd74a |
1,876,114 | 9 Essential Tips for Writing Efficient Shaders | Shaders are integral to modern computer graphics, enabling real-time rendering of complex scenes and... | 0 | 2024-06-04T04:45:58 | https://glsl.site/post/9-essential-tips-for-writing-efficient-shaders/ | gamedev, beginners, programming, tutorial |
Shaders are integral to modern computer graphics, enabling real-time rendering of complex scenes and effects. Writing efficient shaders can significantly impact the performance and visual quality of your graphics applications. Here are ten essential tips to help you write efficient and effective shaders.
## 1. Minimize Texture Lookups
Tip: Reduce the number of texture fetches to improve performance.
Texture lookups can be expensive in terms of performance. Minimize the number of texture fetches by combining data into fewer textures or using smaller texture maps where possible. Utilize techniques like texture atlases to group multiple textures into a single large texture.
## 2. Use Appropriate Precision
Tip: Choose the appropriate precision for your calculations.
Shaders support different precision qualifiers like highp, mediump, and lowp. Use mediump or lowp for variables that don't require high precision. This can reduce computational overhead and improve performance, especially on mobile devices.
```c
// Example: Using mediump precision for color calculations
mediump vec3 color = texture2D(myTexture, uv).rgb;
```
## 3. Optimize Branching
Tip: Minimize the use of conditional statements.
Branching (if-else statements) can cause performance issues on GPUs due to their parallel nature. Where possible, use arithmetic operations or mix functions to replace branching.
```c
// Instead of this:
if (condition) {
result = value1;
} else {
result = value2;
}
// Use this:
result = mix(value1, value2, float(condition));
```
## 4. Use Built-In Functions
Tip: Leverage built-in GLSL functions for common operations.
GLSL provides a range of built-in functions optimized for performance. Use these functions instead of writing your own implementations for common tasks like vector normalization, dot products, and mathematical operations.
```c
// Example: Using built-in function for dot product
float dotProduct = dot(vec1, vec2);
```
## 5. Reduce Overdraw
Tip: Minimize the number of pixels shaded multiple times.
Overdraw occurs when multiple fragments are drawn on the same pixel. Use techniques like depth culling, early-z testing, and avoiding unnecessary transparent objects to reduce overdraw.
## 6. Precompute Values
Tip: Precompute values outside the shader where possible.
If certain values remain constant throughout a frame, compute them once on the CPU and pass them as uniforms to the shader. This reduces redundant calculations within the shader.
```c
// Precompute matrix transformations on the CPU
uniform mat4 precomputedMatrix;
// Use precomputed matrix in the shader
vec4 transformedPosition = precomputedMatrix * position;
```
## 7. Batch Draw Calls
Tip: Reduce the number of draw calls by batching objects.
Batching similar objects into a single draw call can significantly improve performance. This minimizes state changes and reduces the overhead of issuing multiple draw calls.
## 8. Optimize Looping
Tip: Use loops efficiently and avoid unnecessary iterations.
Limit the number of iterations in loops and unroll them where possible to reduce overhead. Use constants for loop bounds to allow the compiler to optimize the code better.
```c
// Example: Unrolling a loop
const int NUM_ITERATIONS = 4;
vec3 color = vec3(0.0);
for (int i = 0; i < NUM_ITERATIONS; ++i) {
color += texture2D(myTexture, uv + offsets[i]).rgb;
}
```
## 9. Profile and Benchmark
Tip: Regularly profile and benchmark your shaders.
Use profiling tools to identify bottlenecks and areas for improvement. Regular benchmarking helps ensure your shaders run efficiently across different hardware configurations.
| hayyanstudio |
1,876,112 | Embrace Financial Freedom by migrating from QuickBooks to Sage Intacct | Greytrix | In today’s competitive business world, when every investment matters and every choice effects your... | 0 | 2024-06-04T04:43:19 | https://dev.to/dinesh_m/embrace-financial-freedom-by-migrating-from-quickbooks-to-sage-intacct-greytrix-16cc |
In today’s competitive business world, when every investment matters and every choice effects your company’s growth, having the appropriate tools can make all the difference. Agree? For years, QuickBooks has been one of the most dependable accounting software, giving a solid foundation for your financial management.
However, business evolves and grows in tandem with the wants and expectations of organizations. As a result, contemporary ERP systems have replaced accounting software. When it comes to strong, modern ERP, [Sage Intacct](https://www.greytrix.com/sage-intacct/) needs to be at the top of the list.
So, it’s time to say goodbye to QuickBooks and embrace the future with Sage Intacct, which can manage much more than your accounts.
As a result, in this blog, we’ll discuss why you should [migrate from QuickBooks to Sage Intacct](https://www.greytrix.com/blogs/sageintacct/2024/05/31/migrate-from-quickbooks-to-sage-intacct-embrace-the-financial-freedom/).
Let’s go!
**Why Businesses Migrate from QuickBooks to Sage Intacct?**
When a business expands rapidly, it begins to encounter constraints in its QuickBooks capabilities. Some of the most typical difficulties that growing businesses encounter with QuickBooks are:
1. Lack of Revenue Management
2.Ineffective Inventory Management
3.Lack of Automation Capabilities
In that case, they want a more advanced accounting technology to handle their larger invoice and payment volume while also providing more sophisticated reporting. This is one of the primary reasons why organizations are switching to a more scalable and flexible ERP solution, such as Sage Intacct.
**Sage Intacct vs QuickBooks**
QuickBooks and Sage Intacct ERPs differ in that they serve to organizations of varying sizes and address different requirements. Whereas QuickBooks provides basic accounting functionalities that are best suited to smaller firms, Sage Intacct is designed for mid-market and big businesses and includes more comprehensive accounting functionalities and capabilities.
Let’s look at the main distinctions between the two ERPs.
**Reasons to Opt for QuickBooks to Sage Intacct** [Migration](https://www.greytrix.com/migration/)
**Advanced Functionality and Scalability**
Sage Intacct outperforms QuickBooks in terms of advanced features and functionality. It has a variety of complex features, such as multidimensional data structures and customizable reporting tools.
One of the most crucial things to remember is that Sage Intacct will seamlessly cover you as your organization grows, making it a strong framework for expanding financial requirements.
**Cloud Capability**
Thanks to its cloud features, Sage Intacct eliminates the need for software installations, data backups, and manual updates. Sage Intacct, being a cloud-based ERP software, allows you to access financial data at any time and from any location. Sage Intacct keeps you connected to your business and its finances, no matter where you are.
**Scalability for Growth**
Scalability is another major reason to transition from QuickBooks to Sage Intacct. QuickBooks may be serving you well, but is it prepared to tackle the future? Sage Intacct’s strong scalability makes it suitable for businesses of all sizes, from startups to enterprises.
**Better Financial Visibility and Reporting**
Sage Intacct ERP provides precise real-time visibility into your financial data from many departments. This is one of the primary reasons why Sage Intacct has a considerable edge over QuickBooks.
The ERP has extensive reporting and analytics tools that give comprehensive and actionable data insights, allowing for better decision-making and data-driven initiatives.
**Future-Proofing Your Business**
By migrating QuickBooks data to Sage Intacct, you can protect your financial processes for the future. Sage Intacct ERP also provides ongoing support through the most recent upgrades and improvements, ensuring compliance with current rules, industry standards, and technology advancements.
**Benefits of Migrating to Sage Intacct**
let’s have a look at the competitive advantages of migrating your financial operations to Sage Intacct.
- Scalability Potential
- Simplified Reporting
- Enhanced Data Quality
- Better Adaptability
- Automated Processes
- Enhances Security
- Role-Specific Authorization Processe
- Seamless Collaboration Between Teams
- Better Inventory Management
- Advanced Revenue Recognition Capabilities
Is It the Right Time for Your Business to Migrate to Sage Intacct from QuickBooks?
QuickBooks may be operating completely great for your business right now. However, when your firm expands and grows, the ERP may be unable to handle your financial activities. So, if you’re planning ahead, you can consider [Sage Intacct data migration](https://www.greytrix.com/blogs/sageintacct/2021/12/09/outgrowing-your-old-erp-system-migrate-to-sage-intacct/) from QuickBooks.
Furthermore, if your present software isn’t serving your needs, you should switch to Sage Intacct immediately. However, it is strongly advised to thoroughly analyze all factors, particularly the financial consequences, before switching to Sage Intacct. Here are a few of the factors:
1.Ensure that your company is completely prepared to respond to a change in financial operations.
2.Evaluate your team’s training requirements to become acquainted with the new ERP software.
3.Evaluate how the new ERP aligns with your business’s long-term objectives.
4.The time it takes to migrate from QuickBooks to Sage Intacct.
**Conclusion**
QuickBooks and Sage Intacct have distinct database formats. However, when you have experienced migration professionals on your side, the migration procedure becomes much simpler. The specialists can handle your data migration procedure while developing an appropriate Sage Intacct deployment plan. Budgeting and planning for Sage Intacct deployment is the first step.
[Greytrix](https://www.greytrix.com/) is a Sage Intacct migration specialist with extensive ERP industry expertise and knowledge. Call us at +1 888 221 6661 or click here to schedule a Sage Intacct consultation and see how we can help you harness the ERP software for your organization.
Originally Published by www.greytrix.com on 04.06.2024 | dinesh_m | |
1,876,111 | Twin Screw Extruders: Meeting the Demands of Modern Polymer Industries | What are Twin Screw Extruders and Why are They Important for the Modern Polymer... | 0 | 2024-06-04T04:36:51 | https://dev.to/brenda_hernandezg_26bd74a/twin-screw-extruders-meeting-the-demands-of-modern-polymer-industries-4ia3 | extruders | What are Twin Screw Extruders and Why are They Important for the Modern Polymer Industry
Introduction
Twin screw extruders are devices that are trusted inside the polymer industry to generate a range wide of products and services. These devices have actually two synchronous screws that turn to the way exact same mix and melt natural polymer materials effectively. Twin screw extruders can be utilized in lots of companies; this informative article shall concentrate on the advantages, innovation, security, usage, utilizing, solution, quality, and application of double screw extruders
Benefits
Twin Screw Extruder have actually a couple of benefits inside the old-fashioned screw solitary. Firstly, twin screw extruders tend to be more versatile when it comes to managing a number wide of materials. Moreover, this machine guarantees control precise making them perfect for companies with certain production requirements. The style regarding the screw double means that low-quality feeds can be used, although the noteworthy mixing function guarantees uniformity
Innovation
The screw double machine is constantly evolving, and innovation is going on to help make the gear definitely better and efficient. Present development technical heard about addition associated with the co-rotating mode to deliver a better blending system. This mode when it comes to machine delivers a measurement brand new blending abilities, allowing the machine to make better polymers. The screw double has improved item quality, increased efficiency and exceptional blending abilities due to this
Security
Twin screw Extruder Machines have actually a few safety features put in their design to make certain they are safe to utilize. The clear presence of interlocks stops the apparatus from beginning unless the address is guaranteed or stops employees from accessing components being going. Extruders have automated shut-off features, which activate whenever there exists a fault in to the system functional prevent any damages that may take place due to breakdown
Usage
Twin screw extruders typically include a engine, feeding system, gear transmission components, mixer, barrel, and control system. The apparatus is not too difficult to utilize; nevertheless, it needs some degree known of. The product garbage feeding the barrel in connection with machine, when the polymer melt is developed through the warmth generated by the engine. The melted polymer will undoubtedly be conveyed through different stations towards the die, where it's intended to forms and this can be sizes that are particular
Utilizing
The next actions are crucial with all the screw extruder twin. Firstly, load the barrels utilising the needed natural materials through the machine feeding. Make sure that the address is precisely guaranteed before powering up the machine. Set the rate that's required is heat into the control system, and commence the machine. Monitor the machine for virtually any faults and give a wide berth to the machine, conduct upkeep or alter the settings whenever necessary
Service
Twin screw extruders need regular servicing which will make performance certain is optimal. The regularity of upkeep varies according to your use regularity regarding the machine. Solution intervals must certainly be followed closely in order to avoid any breakdown untimely would compromise the security of both the machine and so the operators. Additionally it is imperative to employ competent technicians to conduct upkeep regular installation, and fix associated with machine
Quality
Lab Twin Screw Extruder have excellent blending abilities that guarantee uniformity associated with the polymer substances produced. The blending system additionally guarantees that the principal traits about the materials are retained. This, in change, ensures that services and products generated by double screw extruders meet industry criteria. Due to this, items are manufactured with exceptional physical, chemical, and properties being technical
Application
The flexible about the screw double means that it can be used in a few companies such as; meals, oil, aesthetic, and pharmaceutical companies, among others. These companies use double screw extruders to produce items such as synthetic bags, plastic containers, meals packaging materials, and medication capsules. The production industry by allowing the manufacturing of top-quality items at an increased ability along with less resources in essence, twin screw extruders may play a role a must
Source: https://www.gs-twinscrewextruder.com/Twin-screw-extruder | brenda_hernandezg_26bd74a |
1,872,286 | Why should you automate your architecture on AWS? | Why should you automate your architecture on AWS? The answer to this question in not... | 0 | 2024-06-04T04:28:26 | https://dev.to/welcloud-io/why-should-you-automate-your-architecture-on-aws-333c | ## Why should you automate your architecture on AWS?
The answer to this question in not obvious. I remember explaining how to automate an application architecture on AWS to a colleague a few years ago, and his reaction was : I don't understand anything!
Maybe I didn't explain this clearly, but when someone tells me he doesn't understand something, it often means he doesn't see any benefit for him.
That’s why I wanted to list the benefits I discovered while automating my architectures on AWS for many years now.
N.B. : This article is AWS (Amazon Web Services) oriented with AWS examples because this is the cloud computing platform I work with everyday, nevertheless the benefits listed above, would be the same on any other cloud provider enabling automation.
First let’s define what is an architecture for me.
## What is an architecture on AWS?
Defining architecture is hard, but let's say that an architecture is a virtual structure that will host our algorithms and data. Here is a very simple but typical layered architecture : a client, a server and a database (both inside a network).
_N.B. : This is a high level of abstraction, and there are many ways to implement this pattern on AWS._
So, let's imagine that you want to build that structure for your application using basic AWS services, then you would:
- create a network (a VPC,...)
- create a server (an EC2 instance) and configure it with the required libraries
- create a database (e.g. another EC2 instance again) and configure it with a database engine (e.g. MySQL)
To build the previously described structure can be very easy nowadays by clicking in the web pages of the Amazon Web Services console.
However, it exists another option: writing a file where you will describe your architecture and use an "architecture engine" that will automatically create all the components. Well known examples of these tools are AWS CloudFormation or Hashicorp Terraform.
But, I must be honest, this will take more time to write, execute and test that way. Maybe 2 or 3 times more, compared to clicking into the AWS console. Even if you have the skills.
## So, again, why should I automate my architecture on AWS?
### Automate to repeat your architecture
Unfortunately, we do not need our architecture at only one place. We often need to have our application deployed in different environments. A development environment, a production environment and sometimes a staging environment. All these environments have different purposes.
A production environment has an obvious purpose. This is where you application will run to serve your real users (those who want the application to always be available).
The development environment is where you want to experiment things, without disturbing the production environment.
Staging environment is, for example, where you want to load test your application in an architecture which is identical to production.
By automating your architecture, you can rebuild it anywhere from scratch. And the time you thought you "lost" when building the first template becomes largely profitable because the "architecture engine" will "click" much faster than you do!
### Automate to update your architecture with confidence
In my example at the beginning of this post, I do not show all the details of my architecture for the sake of simplicity. But in the real world you may have to deal with many architecture details.
You can have network details (e.g. subnets, route tables, …), security details (e.g. firewall rules, role permissions, …), storage details (e.g. volume size, volume type, …), availability details (e.g. load balancer, scaling policy, …) etc.
So, if you had to manually update these in multiple environments, it's easy to make mistakes, to forget something, to configure things slightly differently, etc. That can have consequences on your application stability, reducing your confidence in changing things.
By automating your architecture, you avoid human errors and you feel more confident. Machines do not only click faster than you do, they are also more reliable!
### Automate to reuse & share architectural models
The good news is that you almost never have to build a complete architecture from scratch. Template models exist on the web and you can reuse and adapt them to your needs.
Moreover, you can create and share your own architecture templates within the company. Or simply restart from one you previously deployed when you have a similar architecture to work on (you can imagine building your own "architecture catalog").
With specific tools like AWS CDK (Cloud Development Kit), some models are completely embedded with best practices (like the AWS Well Architected Framework practices). You can create a complete well architected Kubernetes cluster with just a few lines of code!
Do not Repeat Yourself (DRY), is now a development technique that you can use in application architecture!
### Automate to evolve your architecture
I do not know your architecture today, but I can tell you one thing: within 3 years it will not be the same!
So, imagine you want to deploy a new version of your architecture (e.g. you want to use containers or add serverless technologies). You could simply update it directly, but this can incur some downtime of your application. Even worse, the new version may not work right away and the application may be unavailable for a long time.
With automation, you can build a partial or completely new architecture without disturbing the one in place.
Then you test the new version. If it's working ok, you shift (progressively) the traffic to the new version. If not, you shift the traffic back to the previous version. When you are happy, you can then destroy the old architecture.
Today's architecture evolves more often, automating will help evolving your architecture incrementally while limiting risks. Do you think successful startups have the right architecture on day one and keep it forever?
### Automate to postpone your architectural decisions
Architects are suppose to take "hard/costly to change decisions" like choosing between a relational (e.g. MySQL) or a non relation database (e.g. MongoDB) because if you discover that you made the wrong choice when you start running your application in production this will have a big impact!
We also often think that the architect should have the answer at the beginning of the project. Which is certainly the worst moment because this is when he has the least information to make a decision.
I remember working on an architecture where I made very complicated decisions at the virtual network layer. The reason was that my understanding of the problem to solve was not mature enough.
If I had not automated this part I guess I would have kept this complex virtual network architecture (which would not have been good for the project).
When I had a better understanding, I simplified this virtual network layer in my templates and rebuilt the complete architecture on top of it. Within a few hours of work, it was done thanks to automation.
### Automate to document your architecture
Code is the only source of truth. If you document your architecture in Microsoft Word or Google Docs documents, you will rapidly have a drift (and I personally never use those for describing an architecture, but only a diagram with the most important information).
Modern architectures constantly evolve. At the detail level, updates can be frequent (New security rules, new permissions, ...), but you may also want to add or replace components (e.g. using AWS EFS, Elastic File System instead of an EBS Volume).
This is really hard to maintain in a word processing document. The only source of truth should be your template!
### Automate to lower the cost of your architecture
I may not need to always leave my development architecture up 24/7. With automation, you can rapidly build an architecture, but you can also destroy its components automatically and easily.
By destroying unused components (a virtual instance, for example), you stop paying for it.
So, if you destroy your architecture in your development environment on a Friday night and you rebuild it on Monday morning you will save about 25% on your bill. And you can go further if you destroy/rebuild every evening/morning during the week.
Even more interesting, you can build a "cheap" architecture to make experiments. For example, if your application needs an expensive EC2 instance (tens of dollars per hour) to run in production, you can still test your architecture with a small instances (lower than 1 dollar per hour) to explore and validate new ideas without paying too much.
When your new shiny architecture is ready for staging or production you just have to change the instance size parameter of your template to make it work.
### Automate to keep your architecture clean
Is this architectural component still used?
This is the kind of question you can ask yourself when you discover an existing architecture built by someone else. But this can also be the case for your own architecture after just a few days of clicks ;)
When you automate the creation and deletion of your architecture's components, you are not bothered with useless components, so you ask yourself less questions and you go faster.
## Conclusion
I could carry on listing other benefits, but this blog post would have been twice as big! So I just kept what I thought was the most important things from my point of view.
In my opinion, there are only benefits with architecture automation.
You may argue it is quicker to click into the console. And you are right if you think of the initial investment you have to do for automating things or if you think your architecture will never evolve.
But, if you carry on doing things manually you take the risk to lose all the automation benefits and be slower and slower over time.
Useful Links:
[AWS CloudFormation](https://aws.amazon.com/cloudformation/)
[AWS CloudFormation Workshop
](https://catalog.workshops.aws/cfn101/en-US)
[AWS CDK (Cloud Development Kit)](https://aws.amazon.com/cdk/)
[AWS CDK Workshop](https://cdkworkshop.com/)
| welcloud-io | |
1,876,103 | Creating a Windows Server Virtual Machine and deploying a Windows Server. | In Azure Portal, select Virtual Machine Select Create Azure Virtual machine Select Resource... | 0 | 2024-06-04T04:20:23 | https://dev.to/opsyog/create-a-windows-server-and-install-windows-server-on-it-52ec | windows, azure, virtualmachine | **In Azure Portal, select Virtual Machine**
**Select Create Azure Virtual machine**
**Select Resource Group**
**Enter Virtual machine name**
**Select Image**
**Enter Username & Password**
**Select Inbound ports**
**Select Licensing and confirm**
**In the Monitoring Tab, disable Diagnostics**
**Select Review + Create, then select create**
**Go to Resource**
**Connect to Virtual machine**
**Select Local machine**
**Ensure it's configured**
**Download RDP**
**Click downloads and enter password**
You should have access into the Virtual machine
**Search for Power Shell in the VM and run as Administrator**
**Use the below Install windows command to Install windows in the Virtual Machine**
**Copy the Public IP address and paste it in a browser to confirm you have successfully deployed a windows server.**
| opsyog |
1,875,926 | Embedding AI into the DNA of Your Company | Transform your organization into an AI-first company by embedding AI into the fabric of your business. Start by integrating AI into daily practices and strategic initiatives, encouraging experimentation, and fostering a culture of continuous learning. Ensure your team is equipped with the necessary AI tools and knowledge. Embody AI practices internally to build credibility and trust. Take action now—assess your AI readiness, share successes and challenges, and push the boundaries of AI's potential. Collaborate with your teams and clients to explore AI-driven solutions and co-create a future where AI drives unparalleled innovation, efficiency, and business success. | 0 | 2024-06-04T04:20:11 | https://dev.to/dev3l/embedding-ai-into-the-dna-of-your-company-35nb | ai, innovation, aifirst, futureofwork | ---
title: Embedding AI into the DNA of Your Company
published: true
description: Transform your organization into an AI-first company by embedding AI into the fabric of your business. Start by integrating AI into daily practices and strategic initiatives, encouraging experimentation, and fostering a culture of continuous learning. Ensure your team is equipped with the necessary AI tools and knowledge. Embody AI practices internally to build credibility and trust. Take action now—assess your AI readiness, share successes and challenges, and push the boundaries of AI's potential. Collaborate with your teams and clients to explore AI-driven solutions and co-create a future where AI drives unparalleled innovation, efficiency, and business success.
tags: AI, Innovation, AIFirst, FutureOfWork
cover_image: https://dev-to-uploads.s3.amazonaws.com/uploads/articles/0ja78so404q5h3vthvci.png
---
_The only way to become an AI-first company is to start utilizing AI as a company_. This simple yet powerful statement encapsulates the essence of transformation in today's science-driven world. As organizations strive to stay competitive, integrating artificial intelligence into daily operations can no longer be a mere aspiration—it needs to be an actionable priority.
AI allows us to revolutionize how we handle tasks, make decisions, and create value. However, becoming an AI-first company involves more than just adopting new technologies. It requires embedding AI into the organization's fabric, ensuring every employee, process, and strategy is aligned with this transformation.
This post will explore the stages of AI adoption, practical applications across various business functions, and the importance of fostering a culture where AI is deeply integrated. By looking at real-world examples and actionable strategies, we see how companies can genuinely embrace AI and realize its full potential.
## Understanding the Stages of AI Adoption
Transitioning to an AI-first company involves deliberate steps that progressively embed AI deeper into your organization's operations and culture. Let's explore these stages:
### 1. Awareness Stage
The journey begins with recognition and education.
- **Recognition**: This stage involves acknowledging the transformative potential of AI. Companies start by understanding the broad implications of AI on their industry, envisioning how AI can solve existing problems, and identifying opportunities for innovation.
- **Education**: Educating employees about AI and its benefits is crucial. This can include workshops, seminars, or internal training sessions. The goal is to build a foundational understanding across the organization, fostering enthusiasm and openness to AI-driven changes.
### 2. Experimentation Stage
Once awareness is established, it will be possible to experiment.
- **Pilot Projects**: Companies initiate small-scale pilot projects to explore relevance and performance in their unique contexts. These could range from automating simple tasks to implementing AI-driven analytics in specific departments.
- **Evaluation**: After running pilot projects, the next step is to evaluate their outcomes. Assess how AI improves efficiencies, the challenges encountered, and impacts on performance. This stage provides critical insights into the practical application of AI within the company.
### 3. Operational Integration Stage
With successful pilots, AI starts becoming part of the daily routine.
- **Daily Operations**: AI tools are integrated into everyday business processes. This might include using chatbots for customer support, AI for predictive maintenance in manufacturing, or AI-enhanced data analysis for strategic decisions.
- **Efficiency Enhancements**: AI's impact on operational efficiency becomes evident. This stage's key benefits are automating routine tasks, optimizing workflows, and improving decision-making processes.
### 4. Transformational Stage
AI begins to reshape the company's strategy and market position.
- **Strategic Shifts**: Companies leverage AI for incremental improvements and significant strategic changes. AI insights drive new strategies that can enhance competitive standing.
- **Business Model Innovation**: AI can lead to entirely new business models. For instance, a company may develop a new service offering based on AI-driven analysis or create a marketplace powered by AI recommendations.
### 5. Innovative and Pioneering Stage
Finally, AI becomes a driver for continuous innovation.
- **New Offerings**: At this stage, companies are developing and bringing new AI-driven products and services to market. AI is at the core of these offerings, differentiating them in the marketplace.
- **Sustained Innovation**: The company continuously drives innovation by leveraging AI. This ongoing process ensures the company remains at the forefront of technological advancements and maintains a competitive edge.
## Leveraging AI Applications
In this section, we'll explore in greater detail how AI can be applied across various business functions to transform tasks, enhance operational efficiency, and drive strategic value. These applications illustrate the potential of AI to change businesses and fundamentally change how they operate and compete.
### Customer Support
- **AI Chatbots**: Implementing AI-powered chatbots can revolutionize customer support by providing instant, accurate responses to inquiries 24/7. These chatbots can handle customer queries, from basic FAQs to complex troubleshooting steps. For example, a telecommunications company might deploy an AI chatbot to assist customers with billing inquiries and technical support, significantly reducing wait times and operational costs.
- **Personalized Support**: AI can analyze customer interaction history to offer personalized responses and solutions. This enhances the customer experience by making interactions more relevant and efficient. For instance, an e-commerce platform could use AI to review a customer's previous purchases and browsing history to offer tailored recommendations and support.
### Content Creation
- **Automated Content Generation**: AI can be utilized to automate the creation of various content types, including blog posts, social media updates, and marketing emails. Tools like GPT-4 can generate content drafts based on simple inputs, allowing marketing teams to produce high-quality material quickly. For example, a fashion retailer could use AI to automatically create product descriptions and promotional content, ensuring consistency and freeing up time for strategic planning.
- **Content Personalization**: AI can also help personalize content for different audience segments. AI can customize newsletters, advertisements, and social media posts by analyzing user data and preferences to appeal to specific segments. A media company might use AI to personalize video content recommendations on their streaming service, increasing viewer engagement and satisfaction.
### Data Analysis
- **Big Data Analytics**: AI excels at analyzing vast datasets to uncover patterns and trends that human analysts might miss. This capability is vital for sectors like finance and healthcare, where insights from big data can drive critical decisions. For example, a financial institution could use AI to detect fraudulent transactions by analyzing transactional data for unusual patterns that indicate fraud.
- **Predictive Analytics**: AI can predict future trends based on historical data, providing valuable foresight for strategic planning. Retailers, for example, can use AI to forecast inventory needs and customer demand, optimize stock levels, and reduce waste.
### Scheduling and Administrative Tasks
- **Automated Scheduling**: AI can handle administrative tasks such as scheduling meetings, managing calendars, and sending reminders. This automation allows employees to focus more on strategic and high-value activities. For instance, a consulting firm could use AI to schedule client meetings, ensuring optimal time management and reducing administrative burden.
- **Workflow Optimization**: AI can assess and streamline workflow processes, identifying bottlenecks and suggesting improvements. This can lead to enhanced efficiency and productivity across various departments. A manufacturing company might implement AI to optimize its production scheduling, minimizing downtime and maximizing output.
### Personalization
- **Customer Experience**: AI can analyze customer behavior and preferences to deliver highly personalized experiences. Businesses can significantly enhance customer satisfaction and loyalty by tailoring interactions and offerings. For example, an online retailer might use AI to personalize the shopping experience, recommending products based on past purchases and browsing behavior.
- **Recommendation Systems**: AI-driven recommendation engines can suggest products, services, or content tailored to individual preferences. This boosts sales and helps build a more engaged and satisfied customer base. Streaming services like Netflix and Spotify use AI to recommend shows and music based on our viewing and listening history, creating a more personalized consumption experience.
### Process Automation
- **Robotic Process Automation (RPA)**: AI can automate repetitive tasks such as HR onboarding, invoice processing, and data entry. RPA enhances accuracy and speed, reducing error rates and freeing employees to focus on more strategic roles. For instance, a finance department might use RPA to automate accounts payable processes, ensuring timely and accurate payment processing.
- **Supply Chain Optimization**: AI can optimize supply chain operations by predicting demand, managing inventory levels, and improving logistics. This leads to cost reductions and enhanced efficiency. For example, a global retailer might use AI to optimize their supply chain, ensuring that products are in stock where and when needed while minimizing inventory costs.
### Innovation Support
- **Research and Development**: AI can accelerate R&D by analyzing large volumes of research data, identifying patterns, and suggesting new directions for innovation. Pharmaceutical companies, for example, can use AI to analyze clinical trial data, speeding up the drug discovery process and bringing new treatments to market faster.
- **Product Development**: AI can assist in product design and testing, reducing time to market and improving product quality. An automotive company might use AI to simulate and test vehicle designs, optimizing performance and safety features before building physical prototypes.
#### Marketing and Idea Generation
- **Marketing Automation**: AI can streamline and optimize marketing campaigns by analyzing data and predicting the best times and channels to reach target audiences. This ensures that marketing efforts are more effective and cost-efficient.
- **Idea Generation**: AI can be a powerful tool in ideating new products, services, or marketing strategies by analyzing market trends, customer feedback, and competitive analysis. For example, a tech company might use AI to generate ideas for new app features based on user reviews and industry analysis.
### Mock Customer Interactions
- **Simulating Interactions**: AI can simulate customer interactions, helping sales and support teams train and prepare for various scenarios. This ensures that teams are better equipped to handle real-world customer interactions effectively.
- **Scenario Testing**: Companies can use AI to test different customer interaction scenarios, identifying the most effective approaches and refining their strategies accordingly.
### Generating and Completing Work Items
- **Software Development**: AI tools like Copilot and GPT can assist in generating and completing software development tasks, such as writing user stories, coding, and debugging. This can significantly speed up the development process and improve code quality.
- **Task Automation**: AI can automate creating and managing work items, ensuring teams stay organized and focused on their priorities. This is particularly useful in agile environments where tasks and priorities change frequently.
### Customized How-To Tutorials
- **Step-by-Step Guides**: AI can provide customized how-to tutorials for nearly any task, from integrating APIs to setting up complex systems. These guides can be tailored to users' specific needs and technical levels.
- **Integration Support**: AI can assist with integrating various APIs and services, offering step-by-step instructions that make the process smoother and more efficient. For example, AI can guide a development team through integrating a new payment gateway into their e-commerce platform.
## Cultural Embedding of AI
To fully unlock the potential of AI, embedding it into the organizational culture is essential. This involves fostering an environment where AI is not just a tool but a fundamental aspect of the company's operations. Here to develop a robust AI-driven culture:
### Regular Learning and Sharing Platforms
- **Workshops and Training**: Organize regular workshops and training sessions focusing on various AI aspects. These can cover basic principles, advanced techniques, and practical applications relevant to your industry. For example, at Artium, employees could participate in sessions on leveraging AI for software development or client project management.
- **Guest Speaker Sessions**: Invite industry experts and thought leaders to share their insights on AI advancements and best practices. This will bring fresh perspectives and keep the team inspired and informed about the latest trends.
- **Interactive Forums**: Create internal forums or discussion groups where employees can share their AI experiences, challenges, and successes. Platforms like Slack or dedicated intranet forums can facilitate real-time knowledge exchange and foster community around AI initiatives.
### Recognition and Reward Programs
- **Incentivizing Innovation**: Implement reward programs recognizing employees who contribute valuable AI insights or innovations. This could include spot bonuses, feature stories in internal newsletters, or public recognition in company meetings. Such incentives encourage employees to actively engage with AI technologies and think creatively about their applications.
- **AI Awards**: Establish annual or quarterly AI awards celebrating exceptional AI adoption and implementation achievements. Categories could include Best AI Project, Most Innovative Use of AI, and AI Champion of the Year. These awards can boost morale and highlight the company's commitment to AI.
### Leadership Involvement
- **Executive Sponsorship**: Ensure senior leaders actively sponsor and participate in AI initiatives. This could include leading AI task forces, mentoring AI projects, and demonstrating AI usage in their workflows. Leadership involvement signals the importance of AI to the entire organization and provides the necessary support for success.
- **Transparent Communication**: Leaders should communicate the vision and goals related to AI adoption clearly and consistently. Regular updates on AI progress, challenges, and successes help maintain momentum and align everyone with the organizational objectives.
### Encouraging AI Experimentation
- **Innovation Labs**: Set up innovation labs or sandbox environments where employees can experiment with AI technologies without the pressure of immediate results. These labs encourage creativity and allow for trial and error, essential for learning and innovation.
- **Hackathons and Competitions**: Organize AI-focused hackathons and competitions that challenge employees to develop innovative AI solutions to business problems. These events foster teamwork, creativity, and a competitive spirit that drives AI adoption forward.
### Providing Resources and Tools
- **Access to AI Tools**: Ensure employees have access to the necessary AI tools and technologies. This includes software, hardware, and data resources required to experiment, develop, and implement AI solutions.
- **Learning Materials**: Provide access to various learning materials, including online courses, books, tutorials, and research papers. Encourage employees to pursue continuous education and stay informed about AI advancements.
### Fostering a Data-Driven Mindset
- **Data Literacy**: Promote data literacy across the organization by offering data analysis, interpretation, and visualization training. A strong understanding of data is foundational to effectively leveraging AI.
- **Integrating AI into Decision-Making**: Encourage teams to incorporate AI insights into their decision-making processes. Review AI-generated data regularly during meetings and strategize based on these insights.
### Case Study Example: Artium's Approach
- **The Periodical All-Hands Meeting**: At Artium, the weekly all-hands meeting, known as the Periodical, is a platform for sharing company updates, celebrating milestones, and learning from client projects. During a recent Periodical, CEO Ross Hale emphasized the importance of deep learning and AI in weekly activities. He encouraged employees to continuously refine their skills using AI technologies, reinforcing that being able to "walk the talk" is crucial for client trust and company credibility.
- **Leadership Commitment**: Ross Hale's message underscores the company's commitment to making AI an integral part of its operations. By prioritizing AI skill development alongside client work, Artium ensures its team remains at the cutting edge of technology, ready to deliver exceptional value to clients.
Developing a robust AI-driven culture requires a concerted effort across all levels of the organization. Companies can deeply embed AI into their DNA by fostering continuous learning, recognizing innovation, involving leadership, encouraging experimentation, providing resources, and promoting a data-driven mindset. This enhances operational efficiency, and drives sustained innovation and competitive advantage.
## Embracing the AI Future
As we've seen, transitioning to an AI-first company involves more than just adopting cutting-edge technologies; it requires a fundamental shift in how AI is integrated into the very fabric of your organization. Embedding AI into your company's DNA can unlock immense value and competitive advantage, from enhancing customer support and automating routine processes to driving innovation and fostering a culture of continuous learning.
The journey to becoming AI-first begins with deliberate, consistent efforts to incorporate AI into daily practices and strategic initiatives. Encourage experimentation, celebrate innovation, and ensure every team has the tools and knowledge to harness potential. By taking these first steps, your organization can gradually transform and adapt to the evolving technological landscape.
Walking the talk is crucial in this transition. Don't advocate for AI to your clients; embody these practices internally to build credibility and trust. Making AI a central part of your organizational culture and operational strategy enhances your company's self-sufficiency and innovation and sets a powerful example for others in your industry.
Now is the time to take action. Assess where your company stands in its AI journey and identify the following steps to deepen AI integration. Share your AI successes and challenges, learn from peers, and continuously push the boundaries of what AI can achieve in your business. By fostering an ecosystem of learning and innovation where AI becomes a key driver of growth and transformation, you can ensure your company stays at the forefront of technological advancement.
Invite your teams, clients, and networks to join you in exploring and implementing AI-driven solutions. This collaborative approach will help build a cohesive, forward-thinking business environment that values continuous improvement and technological adoption.
AI is not just a tool; it's a catalyst for change. By embedding AI into your company's core, you're preparing for the future and actively shaping it. Start your AI journey today, and let's create a future where AI drives unparalleled innovation, efficiency, and success.
| dev3l |
1,876,092 | Future Prospects of Deepwater Drilling | The Future of Deepwater Drilling: Exploring the Advantages of Innovation and... | 0 | 2024-06-04T04:17:28 | https://dev.to/brenda_hernandezg_26bd74a/future-prospects-of-deepwater-drilling-6h0 | drilling | The Future of Deepwater Drilling: Exploring the Advantages of Innovation and Safety
Introduction
Deepwater drilling is the process of drilling for oil and gas at depths of 500 feet or more below the ocean's surface. This process requires significant technological advances, innovations, and safety measures. Deepwater has crucial applications in the energy industry, which drive economic growth and development across the world. We will explore the future prospects of deepwater drilling, including the advantages, innovation, safety, use, and service.
Benefits of Deepwater Drilling
Some great benefits of deepwater Drilling are wide ranging, and possesses been a element like a must of manufacturing for longer than fifty years
The foremost benefit of deepwater drilling is it provides big volumes of fuel and oil having a quality like financial
Deepwater drilling has taken significant changes in to the power industry, mainly in providing the economy like global a rise of reliable and cleaner resources of power
Furthermore, deepwater drilling helps nations achieve their energy safety goals, which decreases the whole world's dependency on foreign oil and gas providers
Innovation in Deepwater Drilling
Innovations have now been during the forefront associated with the drilling industry like deepwater
One of many innovations that are major to the deepwater drilling industry may be the growth of drilling technology that reduces drilling costs and enhances efficiency like functional
The drilling industry has included reliable and effective drilling like downhole, drilling liquids and drilling rigs that raise the accuracy and productivity with this drilling procedure in the last couple of years
Moreover, the introduction of new sensors and monitoring products has improved the security of deepwater drilling
The utilization of cordless technology allows the drilling like overseas to hold an eye fixed on drilling operations in real-time, allowing for quick responses to dangers that are potential
Innovations that improve the efficiency associated with drilling procedure are often safety like increasing for employees plus the environment
Safety in Deepwater Drilling
Security is just a element like critical of drilling operation
Drilling & Workover Rigs in deep waters requires safety like special to shield workers whilst the environment
Operators once you glance at the deepwater drilling industry must follow health like strict safety criteria set by industry organizations and regulatory figures
The drilling gear, equipment and tools must frequently be examined and maintained to ensure safety like optimal
Operators additionally needs to monitor the fine's integrity and stress to make sure it safely operates and responsibly all the time
Usage of Deepwater Drilling
The application of deepwater drilling is important in petroleum manufacturing, especially within the extensive research and production of Crude oil and gas like natural
The method involves using especially designed platforms and rigs that may run in water depths surpassing 500 legs
Exploratory drilling is conducted to recognize the presence of oil and coal resources beneath the ocean's area
Following the presence of gasoline and oil is confirmed, operators can commence manufacturing by drilling wells where the gas and oil can be extracted and transported to facilities that are manufacturing
Just how to use Deepwater Drilling
To utilize deepwater drilling, operators must first determine a place like prospect like suitable has high risk of oil or fuel production
This typically involves conducting considerable geological and studies being seismic the ocean flooring to recognize places where hydrocarbons could be discovered
Once it has been identified, operators can deploy specialized drilling platforms, known as MODUs, or Cellphone Offshore Drilling devices, that are built to withstand the ocean like harsh and water depths
The drilling process would be initiated, as well as the operators can monitor and get a handle on the drilling operations remotely using higher level tools being technical
Provider and Quality of Deepwater Drilling
Service and quality are necessary elements in deepwater drilling operations
Service quality involves the capacity to use technology to supply help, maintenance, and advice towards the drilling operations remotely
Which means that businesses can deploy a group of experts who are able to resolve any problem like drilling-related a safeguarded location onshore
Quality service additionally involves ensuring that the drilling equipment is routinely maintained and serviced to make performance like sure is optimal
The standard of drilling operations is essential for making sure the research and manufacturing tasks are safe, dependable, and efficient
Electric Control Valves Operators must adhere to strict regulations and standards that ensure that the drilling operations don't have a impact like harmful environmental surroundings
Businesses must evaluate their operations rigorously and enhance their processes constantly to give you drilling like top-quality
Conclusion
Deepwater drilling is a complex and challenging process that requires significant technological advances, innovations, and safety measures. The future prospects of deepwater drilling are bright, with continued advances in drilling technology, safety measures, and environmental sustainability practices. Deepwater drilling has brought significant benefits to the energy industry, primarily in providing reliable and cleaner sources of energy, reducing the world's dependency on foreign oil and gas providers, and achieving energy security goals. As the energy industry continues to expand, deepwater drilling operations will remain critical in meeting the world's energy needs while ensuring that exploration and production activities are safe, reliable, and efficient.
Source: https://www.cngongboshi.com/drilling--workover-rigs | brenda_hernandezg_26bd74a |
1,876,090 | How to add flexibility to your RAG applications by choosing the right configuration(s) | Knowledge Bases for Amazon Bedrock is a fully managed capability that helps you implement the entire... | 0 | 2024-06-04T04:14:22 | https://community.aws/content/2gSzqTkFq25coY1upSDvpcVowV6/add-flexibility-to-your-rag-applications-in-amazon-bedrock | machinelearning, generativeai | [Knowledge Bases for Amazon Bedrock](https://aws.amazon.com/bedrock/knowledge-bases/) is a fully managed capability that helps you implement the entire RAG workflow from ingestion to retrieval and prompt augmentation without having to build custom integrations to data sources and manage data flows.
There are several configurations you can tweak to customize retrieval and response generation. This done via query configuration parameters which can be applied via the console, API or the SDK.
Let's walk through them one by one.
## Maximum number of retrieved results
Semantic search (the retrieval in RAG) are usually Top-K searches i.e. *"Give me the best K search results in response to my query"*. By default Amazon Bedrock returns up to five results in the response. But you can modify this:
## Search Type
You can actually decide to combine semantic search with the "good old" text based search - Choose the **Hybrid** search type if that's the case. Combines searching vector embeddings (semantic search) with searching through the raw text.
Opting for the **Semantic** option only searches through the vector embeddings.
> Note: At the time of writing **Hybrid** search is currently only supported for Amazon OpenSearch Serverless vector stores that contain a filterable text field. Amazon Bedrock falls back to using semantic search if you configure a different vector store or your Amazon OpenSearch Serverless vector store doesn't contain a filterable text field.
## Prompt template
The **"A"** (Augmented) in RAG is when the search results are combined with the prompt. Amazon Bedrock uses a default prompt template. But you can do further prompt engineering using prompt placeholders (such as `$query$`, `$search_results$`, etc.).
Prompt templates differ based on the chose model. For example, here is the one for [Amazon Titan Text Premier](https://aws.amazon.com/bedrock/titan/):
... and here is the one for **Claude Haiku**:
> Note: This is only use with [RetrieveAndGenerate](https://docs.aws.amazon.com/bedrock/latest/APIReference/API_agent-runtime_RetrieveAndGenerate.html) API
## Inference parameters
These are values that you can adjust in order to influence the model response. This includes `temperature`, `topP`, `topK`, stop sequences, etc.
You can set these with Knowledge Base RAG queries as well.
> Note: This is only use with [RetrieveAndGenerate](https://docs.aws.amazon.com/bedrock/latest/APIReference/API_agent-runtime_RetrieveAndGenerate.html) API
## Guardrails
With [Guardrails in Amazon Bedrock](https://docs.aws.amazon.com/bedrock/latest/userguide/guardrails.html), you can implement safeguards for your generative AI applications based on your use cases and responsible AI policies. A guardrail consists of multiple policies to avoid content that falls into undesirable or harmful categories.
Once you create a Guardrail, simple associate it with the knowledge base:
> Note: This is only use with [RetrieveAndGenerate](https://docs.aws.amazon.com/bedrock/latest/APIReference/API_agent-runtime_RetrieveAndGenerate.html) API
## Metadata files
Retrieval does not have to be just limited based on the semantic search results. You can further tune queries by including additional **metadata** files with your source documents. It can contain attributes as key-value pairs that you define for a source document.
You can use filter (equals, greater than, etc.) and logical (and, or) search operators along for metadata based filters.
> For details, you can refer to [Add metadata to your files to allow for filtering](https://docs.aws.amazon.com/bedrock/latest/userguide/knowledge-base-ds.html#kb-ds-metadata)
## Bonus - Chunking and Delete policy
> Strictly speaking, these are not query configurations, but definitely worth knowing
- **Chunking:** During data ingestion (from source to the chosen vector database), the each file is split into chunks using one of the following strategies - no chunking (each file = a chunk), default (each chunk = ~300 tokens), fixed size (you define the size)
- **Data Deletion Policy:** The default policy is `DELETE`, which means that the underlying vector will be deleted along with the knowledge base. To change prevent the vector store deletion, change the policy to `RETAIN`.
## Conclusion
I showed examples for AWS console, but like I mentioned earlier, these are applicable to the SDK and API as well. For example, [here is how the RetrieveAndGenerate API uses these](https://docs.aws.amazon.com/bedrock/latest/APIReference/API_agent-runtime_GenerationConfiguration.html) configuration parameters.
Read more in [Query configurations](https://docs.aws.amazon.com/bedrock/latest/userguide/kb-test-config.html). Happy building! | abhirockzz |
1,876,091 | Day 962 : All I Need | liner notes: Saturday : Had to do a couple of chores (like cleaning out the fridge in my van) so I... | 0 | 2024-06-04T04:13:47 | https://dev.to/dwane/day-962-all-i-need-597i | hiphop, code, coding, lifelongdev | _liner notes_:
- Saturday : Had to do a couple of chores (like cleaning out the fridge in my van) so I got to the station a little later than normal. Got my equipment set up. Of course, my laptop would decide that a firmware update would be a good thing to do! Luckily, it didn't take too long and I was able to finish getting ready. Did the show and had a good time. The recording of this week's show is at https://kNOwBETTERHIPHOP.com
- Sunday : Had a pretty good day. Still tired from my trip, but still did my https://untilit.works cyphers and got some stuff done.
- Professional : First day back at work from vacation. Had a couple meetings. It was good to see everyone. Spent the day trying to catch up, replied to community questions, submitted some expenses and started cleaning up some code.
- Personal : Been updating my travel site https://dwane.in with pictures and videos from my trip to Japan. There's some video still left on my Meta glasses, but for some reason, I can't connect to them to be able to download the videos. The RayNeo X2 glasses that I ordered arrived while I was away. Looking forward to playing around with them and see what I can do. I saw that some people installed Microsoft Edge browser on them. I'm wondering if they can do WebXR.
So many projects I want to work on! haha All I need is time. Been watching videos from Google I/O and been diving into running Machine Learning models in the browser. Did a couple of quick proof of concepts and it's kind of amazing! Going to work on my current side project so I can knock it out this week so I can start on another one.
Have a great night!
peace piece
Dwane / conshus
https://dwane.io / https://HIPHOPandCODE.com
{% youtube sgK6xkf18qo %} | dwane |
1,876,089 | Anitaku: Your Gateway to High-Quality Anime with English Subtitles | In the vast realm of anime streaming platforms, finding a reliable source that offers both... | 0 | 2024-06-04T04:10:50 | https://dev.to/anitakucity/anitaku-your-gateway-to-high-quality-anime-with-english-subtitles-1fno | In the vast realm of anime streaming platforms, finding a reliable source that offers both high-quality content and English subtitles can sometimes feel like searching for a needle in a haystack. However, imagine stumbling upon a virtual oasis where your anime cravings are not only satisfied but exceeded – a place where you can immerse yourself in the vibrant worlds of your favorite shows without compromising on quality or comprehension. Enter Anitaku, a haven for [anime](https://anitaku.city/) enthusiasts seeking top-notch entertainment with the added convenience of English subtitles.
The Anitaku Experience: Where Quality Meets Accessibility
Anitaku stands out among its counterparts by prioritizing two key elements: quality and accessibility. For avid anime fans, the allure of crystal-clear visuals and crisp audio cannot be overstated. With Anitaku, viewers can rest assured knowing that they are accessing content that is presented in the highest possible quality. From stunning visuals to immersive soundscapes, every aspect of the viewing experience is meticulously curated to captivate audiences and bring their favorite anime to life in vivid detail.
Moreover, Anitaku recognizes the importance of accessibility in today's globalized world. While anime originated in Japan, its appeal extends far beyond its borders, captivating audiences from diverse linguistic and cultural backgrounds. English subtitles play a crucial role in bridging this linguistic gap, allowing fans worldwide to fully engage with and appreciate the intricacies of their favorite shows. Anitaku takes this commitment to accessibility seriously, ensuring that all content is accompanied by accurate and well-synced English subtitles that enhance rather than detract from the viewing experience.
A Vast Library of Anime Delights
At the heart of Anitaku lies its extensive library of anime titles, encompassing a diverse range of genres, themes, and styles. Whether you're a seasoned otaku or a casual viewer dipping your toes into the world of anime for the first time, there's something for everyone to enjoy on Anitaku. From timeless classics to the latest releases, the platform boasts a carefully curated selection of anime gems that cater to all tastes and preferences.
Are you in the mood for heart-pounding action and epic battles? Look no further than Anitaku's collection of shonen classics like "Naruto" and "Attack on Titan," guaranteed to get your adrenaline pumping and your heart racing. Prefer a more introspective and thought-provoking experience? Explore the platform's lineup of slice-of-life dramas such as "Your Lie in April" and "March Comes in Like a Lion," which delve into the complexities of human emotions and relationships with unparalleled depth and nuance.
No matter what genre or mood strikes your fancy, Anitaku has you covered with its diverse array of anime offerings. And with new titles added regularly to keep things fresh and exciting, there's always something new to discover and explore on the platform.
The [Anitaku](https://anitaku.city/) Promise: Legal and Ethical Streaming
In an era marked by rampant piracy and copyright infringement, Anitaku distinguishes itself as a beacon of legality and ethics in the anime streaming landscape. The platform operates under strict adherence to copyright laws and licensing agreements, ensuring that all content is obtained and distributed through legitimate channels with the full consent and support of the creators and rights holders.
By upholding these principles, Anitaku not only protects the rights and livelihoods of anime creators but also fosters a sustainable ecosystem that benefits the entire industry. Through its commitment to legal and ethical streaming practices, the platform sets a positive example for other streaming services and helps combat the proliferation of piracy, ultimately preserving the integrity and viability of the anime industry for generations to come.
Embracing Community and Collaboration
At its core, Anitaku is more than just a streaming platform – it's a vibrant community of anime enthusiasts brought together by their shared love for the art form. Through forums, social media channels, and virtual events, Anitaku fosters a sense of camaraderie and connection among its users, providing a space where fans can interact, discuss, and geek out over their favorite shows to their heart's content.
Moreover, Anitaku actively collaborates with anime creators, studios, and licensors to promote and support the growth of the anime industry. By forging partnerships and fostering positive relationships within the anime community, the platform helps elevate the visibility and recognition of both established and up-and-coming talents, ensuring that their creative contributions are celebrated and appreciated by fans worldwide.
Conclusion: Anitaku – Where Anime Dreams Come to Life
In a world inundated with streaming options, Anitaku shines as a beacon of excellence in the realm of anime entertainment. With its commitment to quality, accessibility, legality, and community, the platform offers viewers a truly unparalleled anime-watching experience that transcends boundaries and fosters a deeper appreciation for the art form.
Whether you're a die-hard fan or a curious newcomer, Anitaku invites you to embark on an unforgettable journey through the captivating worlds of anime. So why wait? Dive in, explore, and discover the magic of Anitaku today – your next anime adventure awaits! | anitakucity | |
1,876,085 | Memahami CQRS (Command Query Responsibility Segregation) Kenapa dan Bagaimana Menggunakannya | Apa Itu CQRS? CQRS atau Command Query Responsibility Segregation adalah pola desain... | 0 | 2024-06-04T03:55:05 | https://dev.to/yogameleniawan/memahami-cqrs-command-query-responsibility-segregation-kenapa-dan-bagaimana-menggunakannya-4hmf | programming, go |
### Apa Itu CQRS?
CQRS atau _Command Query Responsibility Segregation_ adalah pola desain arsitektur yang memisahkan operasi data menjadi dua kategori: **command** dan **query**. Ini berarti operasi untuk mengubah data (command) dipisahkan dari operasi untuk membaca data (query). Tujuannya adalah meningkatkan performa, skalabilitas, dan maintainability aplikasi.
### Kenapa Perlu CQRS?
**1. Performance Lebih Nendang**
Dengan memisahkan command dan query, kita bisa mengoptimalkan masing-masing proses secara terpisah. Misalnya, untuk query, kita bisa menggunakan database yang dioptimasi untuk kecepatan baca (_read_). Sebaliknya, untuk command, kita bisa fokus pada konsistensi data.
**2. Scalability Lebih Mudah**
Dalam aplikasi besar, kebutuhan untuk membaca data seringkali jauh lebih tinggi dibandingkan dengan mengubah data. Dengan CQRS, kita bisa menskalakan bagian query dan command secara independen. Jika tiba-tiba ada lonjakan permintaan untuk membaca data, kita bisa menambah instance query tanpa mengubah bagian command.
**3. Keamanan dan Konsistensi**
Dengan memisahkan command dan query, kita bisa lebih mudah mengatur akses. Misalnya, hanya bagian command yang bisa menulis (_create, update, delete_) ke database, sementara bagian query hanya bisa membaca (_read_). Ini membantu menjaga konsistensi dan integritas data.
### Cara Kerja CQRS
Misalnya, kita punya aplikasi e-commerce. Operasi utamanya bisa dibagi menjadi:
- Command: Menambah produk, mengubah harga, menghapus produk.
- Query: Menampilkan daftar produk, menampilkan detail produk.
Dengan CQRS, kita akan membuat dua model yang terpisah untuk menangani operasi ini.
### Implementasi CQRS dengan Go
Mari kita lihat bagaimana kita bisa mengimplementasikan CQRS dalam bahasa pemrograman Go.
**Command Side**
Pertama, kita akan membuat bagian untuk menangani command, yaitu operasi yang mengubah data.
```go
package main
import (
"fmt"
)
type Command interface {
Execute() error
}
type AddProductCommand struct {
ProductName string
Price float64
}
func (c *AddProductCommand) Execute() error {
// Logika buat nambah produk ke database
fmt.Printf("Menambah produk: %s dengan harga: %.2f\n", c.ProductName, c.Price)
// Misalnya kita simpan ke database di sini
return nil
}
type UpdateProductCommand struct {
ProductName string
NewPrice float64
}
func (c *UpdateProductCommand) Execute() error {
// Logika buat update produk di database
fmt.Printf("Mengupdate produk: %s menjadi harga: %.2f\n", c.ProductName, c.NewPrice)
// Misalnya kita update database di sini
return nil
}
func main() {
addCmd := &AddProductCommand{ProductName: "Kaos Keren", Price: 150000}
addCmd.Execute()
updateCmd := &UpdateProductCommand{ProductName: "Kaos Keren", NewPrice: 175000}
updateCmd.Execute()
}
```
Di sini, kita punya dua command: `AddProductCommand` untuk menambah produk baru dan `UpdateProductCommand` untuk memperbarui harga produk yang sudah ada.
**Query Side**
Sekarang, kita buat bagian untuk menangani query, yaitu operasi yang mengambil data.
```go
package main
import (
"fmt"
)
type Product struct {
Name string
Price float64
}
type Query interface {
Execute() ([]Product, error)
}
type GetProductsQuery struct{}
func (q *GetProductsQuery) Execute() ([]Product, error) {
// Logika buat fetch data produk dari database
// Misalnya ini data dari database
products := []Product{
{Name: "Kaos Keren", Price: 150000},
{Name: "Celana Jeans", Price: 200000},
}
return products, nil
}
func main() {
getProductsQuery := &GetProductsQuery{}
products, _ := getProductsQuery.Execute()
for _, product := range products {
fmt.Printf("Produk: %s, Harga: %.2f\n", product.Name, product.Price)
}
}
```
Di sini, kita punya query `GetProductsQuery` yang mengambil data produk dari database (ini masih simulasi, bro).
### Studi Kasus: Toko Online
Bayangkan temen-temen punya toko online yang super rame. User pada ngecek produk terus, tapi ada juga yang sering nambahin atau update produk. Dengan CQRS, kita bisa handle skenario ini dengan efisien:
**1. Scalability**
Jika tiba-tiba ada lonjakan permintaan untuk membaca data (misalnya saat ada promo besar-besaran), kita bisa menambah instance query service tanpa harus mengubah bagian command. Kita juga bisa menggunakan _read-replica_ database untuk bagian query, sehingga bisa menangani lebih banyak permintaan baca.
**2. Performance**
Bagian query bisa dioptimasi untuk kecepatan. Misalnya, kita bisa menggunakan teknik _caching_ untuk menyimpan hasil query yang sering diakses. Dengan begitu, user mendapatkan respons yang lebih cepat. Di sisi lain, bagian command bisa fokus pada validasi data tanpa terganggu oleh query yang berat.
**3. Maintainability**
Dengan memisahkan command dan query, tim pengembang bisa bekerja secara paralel tanpa saling mengganggu. Misalnya, tim yang bekerja pada fitur baru untuk menambah produk (command) tidak perlu khawatir tentang performa query yang sedang dioptimasi oleh tim lain.
### Kesimpulan
CQRS adalah pola desain yang powerful untuk aplikasi skala besar. Dengan memisahkan command dan query, kita bisa mencapai performa yang lebih baik, skalabilitas yang lebih mudah, dan maintainability yang lebih baik. Implementasi CQRS dalam Go cukup sederhana, tetapi dampaknya pada performa dan skalabilitas aplikasi sangat signifikan.
Semoga penjelasan ini membantu memahami CQRS lebih dalam dan bagaimana mengimplementasikannya dalam aplikasi nyata. Selamat ngoding dan jangan lupa ngoding itu diketik jangan dipikir! Sampai jumpa di artikel yang lain ya broo!
| yogameleniawan |
1,876,084 | Vacuum Pumps: Enabling Vacuum Packaging and Sealing Processes | Vacuum Pumps: a Tool powerful in Packaging We often see food products which are tightly packed and... | 0 | 2024-06-04T03:54:41 | https://dev.to/brenda_hernandezg_26bd74a/vacuum-pumps-enabling-vacuum-packaging-and-sealing-processes-ojc | vacuum | Vacuum Pumps: a Tool powerful in Packaging
We often see food products which are tightly packed and sealed when we go to the grocery store. Have you ever wondered how the fresh air is removed from the package? where vacuum pumps come in. Vacuum pumps are machines used to remove air and gas molecules from a container sealed creating a vacuum.
Advantages of Vacuum Packaging
Vacuum Pump packaging has been a innovation great the food industry. By removing the fresh air from the package, it prevents food from oxidizing, which can cause spoilage. This method of packaging also slows down the growth of bacteria and other microorganisms that can cause food poisoning.
Another advantage of vacuum packaging is that it prolongs the shelf life of food. This is because the amount is reduced by it of moisture that can cause food to spoil. Foods like meat, vegetables, and cheese can last longer when vacuum-sealed.
Innovation in Vacuum Pumps
Over the years, vacuum pumps have undergone significant changes, with newer models featuring technology improved provides better performance. Recent innovations include oil-sealed vane rotary, which are used for medium to high vacuum applications, and dry screw pumps, which don't require oil, making them green.
Safety Measures in Using Vacuum Pumps
When operating vacuum pumps, safety is a factor critical. Always read the user manual before use and follow procedures that are proper operation. Vacuum pumps are high-pressure machines that can cause injury if mishandled. Never touch moving parts while the machine is in operation, and always use safety equipment proper.
How to Use Vacuum Pumps
Utilizing a vacuum pump is a process straightforward. First, place the food item inside the bag vacuum-sealed. Next, place the end open of bag over the suction nozzle of the vacuum pump and turn it on. The air will be removed from the bag, creating a seal tight the food item. Once the vacuum pump has removed the air, the bag will automatically seal.
Service and Quality of Vacuum Pumps
When purchasing a Other Pump, it is essential to consider the ongoing service and quality. Look for a reputable manufacturer that has been in the business for a long time and provides support after-sales. The quality of the vacuum pump should also be an option primary. Choose a pump with high durability, reliability, and efficiency to ensure its long service life and performance high.
Applications of Vacuum Pumps
Vacuum pumps have several applications in different industries, including the beverage and food industry, pharmaceuticals, and electronics. In beverage and food, Rotary Vane Vacuum Pump are used in food packaging, bottling, and processing. In the industry pharmaceutical they are used in the production of vaccines, medicines, and other medical products. Lastly, vacuum pumps are used in the electronics industry to manufacture semiconductors and other computer components.
Source: https://www.youchengzhixin.com/vacuum-pump | brenda_hernandezg_26bd74a |
1,876,083 | Deploying NextJS app to mobile App Stores using CapacitorJS | Have you ever thought of having a single codebase for your web and mobile apps? I was... | 0 | 2024-06-04T03:51:32 | https://dev.to/jacobporci/deploying-nextjs-app-to-mobile-app-stores-using-capacitorjs-215c | nextjs, ios, android, javascript | ## Have you ever thought of having a single codebase for your web and mobile apps?
I was recently tasked with a SPIKE ticket to research the gap analysis of getting our app to Google Play and App Store. What immediately popped up in my head was `react-native`. So I searched for popular frameworks that supported this. The top choice was [Solito](https://solito.dev/). It solved 2 things:
- NextJS navigation on mobile
- patterns to build cross-platform apps
The problem was I had to rewrite a lot of code to convert it to `react-native-web` to support native components.
So I asked around the team for some perspective. One suggested [CapacitorJS by Ionic](https://capacitorjs.com/). It was the perfect solution for the requirement!
## Basic setup with my NextJS app
- basically, follow this guide https://capacitorjs.com/docs/getting-started
## Few things to make your life easier
- Use JDK 17 (this is the best version to use with Android to prevent Gradle build issues)
- Use this guide to change your default version https://stackoverflow.com/a/24657630
- Create an `index.html` file inside your `/public` dir that contains:
```
<head></head>
```
- see the note here why you have to do this https://capacitorjs.com/docs/getting-started#add-capacitor-to-your-web-app
## Common build errors with `npx cap sync`
- if `/out` dir is missing, you have to update your `next.config.js` to include `output: export` instead of `output: standalone`
- if Gradle build errors, check if you are using the correct JDK version
- if iOS error
- update your XCode
- install cocoapods using `brew install cocoapods`
## Conclusion
Easy, right? Just make sure your web app is responsive and it should just work smoothly. 🚀 Good luck, mates!
| jacobporci |
1,876,082 | **🎉 iPhone 15 Pro Max Giveaway! 🎉** | [We're excited to announce our latest giveaway! One lucky winner will receive the brand-new iPhone... | 0 | 2024-06-04T03:46:51 | https://dev.to/alquran23738336/-iphone-15-pro-max-giveaway--19h0 |
[We're excited to announce our latest giveaway! One lucky winner will receive the brand-new [iPhone 15 Pro Max](https://sites.google.com/view/3214547/home). Don’t miss out on your chance to own this amazing device! 📱✨]
**How to Enter:**
1. **Follow Us:** Make sure you're following [@YourInstagramHandle](#) on Instagram.
2. **Like this Post:** [Give this post a thumbs up! 👍](https://sites.google.com/view/3214547/home)
3. **Tag 3 Friends:** Tag three friends in the comments who would love an iPhone 15 Pro Max! Each comment counts as an entry, so tag as many friends as you want.
4. **Share to Your Story:** Share this post to your story and tag us so we can see it.
[**Bonus Entry:**](https://sites.google.com/view/3214547/home)
- Share this post on your feed and tag us for 5 extra entries!
**Rules:**
- This giveaway is open to residents worldwide 🌍.
- You must be 18 years or older to enter.
- The giveaway ends on [End Date], and the winner will be announced on [Announcement Date].
- This giveaway is not sponsored, endorsed, or administered by, or associated with Instagram/Apple.
[**Good Luck! 🍀**](https://sites.google.com/view/3214547/home)
#Giveaway #iPhone15ProMax #FreeiPhone #Contest #Win #TechGiveaway
Win iPhone 15 pro max | alquran23738336 | |
1,876,081 | [Conceito] - Não Use HTTP 404 ou 204 para Buscas Sem Resultados | Conteúdo original em https://x.com/zanfranceschi/status/1797835707962245352 Ei dev, Bora falar... | 0 | 2024-06-04T03:45:15 | https://dev.to/zanfranceschi/conceito-nao-use-http-404-ou-204-para-buscas-sem-resultados-6ki | > Conteúdo original em https://x.com/zanfranceschi/status/1797835707962245352
---
Ei dev,
Bora falar um pouco de semântica HTTP e porque acho FEIO retornar um 404 numa busca sem resultados?
No HTTP, uma imagem, uma folha de estilos, um arquivo javascript e detalhes de um usuário em formato JSON são todos igualmente considerados RECURSOS. TUDO É RECURSO!
🧵
---
E como TUDO É UM RECURSO, um endpoint de busca também é um recurso por si só!
Vamos supor os seguintes endpoints:
GET /users/:id - retorna detalhes de um usuário.
GET /users?q=:termo - retorna o resultado duma busca.
---
Dado que todos nós concordamos que GET /users é um recurso (certo?), o CONTEÚDO desse recurso, que é o resultado duma busca, por exemplo, pode ou não conter informações em formato de lista sobre usuários com atributos que se assemelham ao termo usado na query string 'q'.
---
O retorno de GET /users?=berto poderia ser algo como:
[{"nome": "Roberto"}, {"nome": "Adalberto"}]
E uma chamada para o mesmo recurso de busca com parâmetros diferentes – GET /users?=jubis – poderia retornar algo como:
[]
...uma lista vazia.
GET /users é um recurso – sempre!
---
404 é considerado um erro de quem chama seu servidor informando um recurso inexistente! O recurso de busca tá lá, o que não tá é o usuário com o nome Jubiscleiton que você colocou no parâmetro de busca. Faz sentido?
---
Se você é (era?) do time 404, espero ter te convencido de que uma busca é um recurso por si só.
Agora vou falar com você que é do time 204. Fica junto, cola na grade.
"Ain, mas não tem resultado, então não tem conteúdo, então é 204" ouço você resmungar. Rola pra baixo. ↓
---
SEMANTICAMENTE, a gente usa 204 pra quando estamos cagando para o (não) conteúdo.
Por exemplo, quando você manda um PUT /users/1, foda-se o corpo porque você sabe o novo estado do recurso. Tudo que importa é um retorno HTTP com status 204 dizendo que sua requisição deu certo. 👍
---
E num recurso que retorna, p.ex., uma lista (vazia ou não), você se importa com o corpo. É muito mais uniforme verificar o tamanho da lista do resultado da busca, por exemplo. Do contrário, você teria que verificar o status code pra ver se tem itens na lista. ↓
---
if vote 200t
then prinltn(data)
else if vote 204t
then "sem resultados"
🙄
---
Pra finalizar, uma singela homenagem ao @leandronsp:
Poesia "Pelo Reconhecimento da Busca Como um Recurso" by Zan:
GET /users/:id é a comida
GET /users?q=:termo é o pote
E o pote vazio
Não deixa de ser um pote
---
Mais uma coisa: se você tá mexendo num legado que retorna 404 ou 204 pra uma busca vazia e simplesmente não existe benefício em mudar isso, não sofra. O que importa em primeiro lugar é funcionar – seja com 404 ou 204, sinceramente.
---
Muito obrigado se chegou até aqui.
E não esqueça de deixar seu like, se inscrever no canal, e ativar o sininho pra você não vídeo novo do canal.
😗 | zanfranceschi | |
1,876,080 | REDEEM YOURSELF AFTER CRYPTO SCAM WITH CYBERPUNK PROGRAMMERS | The expanse of online investments, where the allure of financial prosperity intertwines with the... | 0 | 2024-06-04T03:43:28 | https://dev.to/brooke_eli_92d96bda0eba77/redeem-yourself-after-crypto-scam-with-cyberpunk-programmers-4pad | cryptocurrency, recovery, experts | The expanse of online investments, where the allure of financial prosperity intertwines with the shadows of deception, my journey commenced with a glimmer of optimism and concluded amidst the depths of disillusionment. In March of this year, I embarked upon what I believed to be a judicious venture—a $90,000 investment in an online platform promising boundless avenues for growth and prosperity. Little did I fathom, that this choice would unravel the fabric of my fiscal security and plunge me into a quagmire from which escape seemed improbable. Initially, the signs appeared propitious—the market surged, and my investments flourished. With each passing day, my confidence burgeoned as my funds purportedly multiplied. However, beneath the facade of success lurked a malevolent truth—a truth that would shatter my illusions and leave me grasping for answers in the depths of night.On an ostensibly ordinary eve, my world was upheaved. Retiring to bed with aspirations of financial autonomy, I awoke to a nightmare of staggering proportions. The $20,000 withdrawal I had requested remained untouched, and an ominous missive awaited me at dawn—a stark reminder of the bitter reality that awaited me. According to the correspondence, I had ostensibly squandered my entire investment overnight, liquidating all positions at a staggering loss. Bewildered and incensed, I racked my brain for any semblance of recollection, only to be met with hollow echoes where memories ought to reside. The veracity was undeniable—I had fallen prey to a nefarious machination, orchestrated by clandestine forces intent on profiteering at my expense.In the depths of despondency, I sought solace in the sole lifeline within my grasp—Cyberpunk Programmers. With trepidation and a flicker of hope, I beseeched their aid, guided by the faint whisper of potential amidst the abyss of uncertainty. From the moment of contact, I was greeted with empathy, professionalism, and unwavering resolve. Cyberpunk Programmers emerged as my stalwart ally in the quest for reparation, navigating the labyrinth of online deceit with precision and expertise. With each passing day, they imparted reassurance, counsel, and a glimmer of hope amidst the gloom. Their relentless endeavors culminated in a triumphant reclamation of my assets, restoring equity where erstwhile lay despair. I stand as a testament to the transformative prowess of Cyberpunk Programmers—a steadfast beacon amidst the tumult, a bastion of hope for those ensnared in the murky morass of deception. With profound gratitude and unwavering admiration, I extend my heartfelt commendation to Cyberpunk Programmers, whose resolute commitment to rectitude has forever altered the trajectory of my narrative.Simply visit their website CYBERPUNKERS DOT ORG or email CYBERPUNK @ PROGRAMMER . NET | brooke_eli_92d96bda0eba77 |
1,876,073 | MindMap for full stack developer interview 🎉 | Hello devs! 🫶🏻 Here is roadmap of Interview preparation in 30 days, everything you need to hit your... | 0 | 2024-06-04T03:37:24 | https://dev.to/khushindpatel/mindmap-for-full-stack-developer-interview-1d7b | Hello devs! 🫶🏻
Here is roadmap of Interview preparation in 30 days, everything you need to hit your full stack developer interview!🙌🏻
First thing First
Follow on Instagram : [@codeandCrunch](https://www.instagram.com/codeandcrunch/)
Here is MindMap link https://miro.com/app/board/uXjVKAYFZuc=
| khushindpatel | |
1,876,079 | The Importance of Maintenance in Oil and Gas Operations | The Importance of Maintenance in Oil and Gas Operations The Need for Maintenance in Oil and Gas... | 0 | 2024-06-04T03:31:58 | https://dev.to/hdweyd_djjehhe_94b0dba4fc/the-importance-of-maintenance-in-oil-and-gas-operations-3om9 |
The Importance of Maintenance in Oil and Gas Operations
The Need for Maintenance in Oil and Gas Operations
1. Why Maintenance is important for Oil and Gas Operations
2. Revolutionary types of Maintenance in Oil and Gas Operations
3. Ensuring Safety and Proper Maintenance
4. Proper Use plus Application of Maintenance in Oil and Gas Operations
5. Quality Service in Oil and Gas Operations and Maintenance
We might think of cars as the products that help us to warm our homes for the cool climate which was cool time the moment we talk about fOil and Gas Operations. But are you aware there is a complete contract which is great continues on behind the scenes to make certain we may has which coal plus oils. It provides actions which are regarding merchandise plus products which have become looked after. This is really called fix.
Probably one of the most issues that are important it comes down down seriously to Oil and Gas Operations decide to try maintaining the device plus equipment being confusing in procedure. Fix involves keeping the unit who is fit to efficiently allow them to plus run effortlessly. Which means that the gas plus oils that are natural ready plus eliminated with no problems.
Why Maintenance is vital for Oil and Gas Operations
Maintenance is vital for the real wide range of grounds. First, it may very carefully help in keeping the equipment plus goods who is fit. This implies they shall instead continue much longer than consume effectively. Next, it shall help make sure that the petrol that are natural to of quality. Finally, it is less expensive to maintain equipment than their to displace them.
There are numerous advantages to merchandise that was petrol which was maintaining oils operations. Firstly, it shall help stop breakdowns plus prolongs the lifespan for the equipment. Next, repair tends to make sure that the oils and coal prepared was of excellent plus satisfies the requirements which are often necessary. Regular maintenance can save companies funds with time by avoiding high priced repairs since replacements.
Revolutionary forms of Maintenance in Oil and Gas Operations
There are numerous methods will be different safeguard products plus merchandise in Oil and Gas Operations. Guys could need to changes elements that are specific things that are fix was broken. Furthermore techniques that are new developed to help handle these devices most readily useful and many other things efficiently.
Innovation decide to try travel the development of the newest kinds of maintaining gear in petrol Oil and Gas Operations that are natural. Some ongoing companies are using computer software take notice of the equipment plus anticipate whenever fix is necessary for example. Others is using drones to look at the pipelines plus gear with the outside, making it safer plus much more efficient.
Ensuring Safety plus Proper Maintenance
Protection the absolute most issues which may be important the Oil and Gas Operations company. Whenever equipment are not maintained properly, they may being dangerous plus accidents which are consequences. This is actually the justification you ought to make sure that the equipment in many cases are who is fit.
Proper maintenance moreover plays an component that is security that is essential is ensuring Oil and Gas Operations. Faulty gear might produce security that was serious to workers plus the environment. Regular maintenance is essential to perils which are determining are potential accidents that are preventing may result in downtime, loss in effectiveness, as well as problems for people as well as the environment.
Proper Use plus Application of Maintenance in Oil and Gas Operations
It is vital to learn how to upkeep which are incorporate petrol plus oils operations that are natural. Meaning for you personally do fix plus what needs to be complete knowing if it is time. Remedies additionally needs to be put meticulously to ensure they are typically complete exactly.
Knowing whenever plus precisely how to make use of fix in Oil and Gas Operations and Natural Gas Compressor that are natural is vital. Proper maintenance remedies should be useful for numerous gear, like pumps, valves, pipelines, plus tanks which are saving. The regularity plus type of fix required is dependent upon problems for example the type of items, the circumstances which may be being employed as well once the environment.
Quality Service in Oil and Gas Operations and Maintenance
Service is surely an right part which can be crucial of for Oil and Gas Operations. This means making certain the products will usually working precisely plus that your Oil and Gas Operations natural oils they produce are of good.
Quality option would be merely a component that are key of in Oil and Gas Operations. This involves making certain the apparatus is clearly running properly, that any nagging problems are quickly addressed plus corrected, plus that the coal and oil produced meet with the requirements that are recommended. Regular servicing plus maintenance might help reduce downtime plus be sure that the oils plus coal operations run effortlessly, efficiently, plus correctly.
fix is very important for Oil and Gas Operations. Keeping the equipment who is fit, ensuring their security, plus producing oils that are natural has been gas which was top-notch critical indicators to reach your aims in the marketplace.
maintenance is really a crucial element of Oil and Gas Operations Products marketing gear durability, ensuring safeguards, plus keeping high quality needs. Revolutionary means, appropriate use, plus quality solution are necessary in attaining effective operations. By prioritizing upkeep, businesses can enhance effectiveness, shield their workers, plus sign up to the charged energy future that are sustainable.
Source: https://www.cngongboshi.com/Natural-gas-compressor | hdweyd_djjehhe_94b0dba4fc | |
1,876,078 | Word Frequency Analysis using Elasticsearch on Alibaba Cloud | Elasticsearch has become an invaluable tool for searching and analyzing the vast amount of data... | 0 | 2024-06-04T03:31:31 | https://dev.to/a_lucas/word-frequency-analysis-using-elasticsearch-on-alibaba-cloud-4i6j | programming, tutorial, ai, productivity | Elasticsearch has become an invaluable tool for searching and analyzing the vast amount of data generated daily. Among its many applications, word frequency analysis is particularly important for understanding the content of large datasets. In this article, we will delve into four solutions for performing word frequency analysis in Elasticsearch, utilizing the robust environment provided by [Alibaba Cloud Elasticsearch](https://www.alibabacloud.com/en/product/elasticsearch).
<a name="xP0uU"></a>
## Enabling fielddata for Aggregating Word Frequencies
The most straightforward approach to word frequency analysis involves enabling fielddata on text fields. Here is an example setup:
```
PUT message_index
{
"mappings": {
"properties": {
"message": {
"analyzer": "ik_smart",
"type": "text",
"fielddata": true
}
}
}
}
```
After indexing some documents, we can then aggregate word frequencies like so:
```
POST message_index/_search
{
"size": 0,
"aggs": {
"messages": {
"terms": {
"size": 10,
"field": "message"
}
}
}
}
```
<a name="S0Qf5"></a>
## Pre-Tagging Documents with Custom Tags for Aggregation
A potentially more efficient approach involves tagging documents with relevant keywords or terms before indexing. This allows for faster aggregation later on:
```
PUT _ingest/pipeline/add_tags_pipeline
{
"processors": [
{
"script": {
"description": "add tags",
"lang": "painless",
"source": """
if(ctx.message.contains('achievement')){
ctx.tags.add('achievement')
}
if(ctx.message.contains('game')){
ctx.tags.add('game')
}
if(ctx.message.contains('addiction')){
ctx.tags.add('addiction')
}
"""
}
}
]
}
```
When indexing documents, specify the pipeline:
```
POST message_index/_update_by_query?pipeline=add_tags_pipeline
{
"query": {
"match_all": {}
}
}
```
<a name="Bwe9B"></a>
## Term Vectors for In-depth Word Frequency Analysis
For fine-grained analysis, Elasticsearch's term vectors provide detailed statistics about term frequencies within individual documents:
```
PUT message_index
{
"mappings": {
"properties": {
"message": {
"type": "text",
"term_vector": "with_positions_offsets_payloads",
"store": true,
"analyzer": "ik_max_word"
}
}
}
}
```
To retrieve term vectors for analysis:
```
GET message_index/_termvectors/1?fields=message
```
<a name="hYHxC"></a>
## Pre-Tokenization and Using Term Vectors
Address potential performance concerns with term vectors by pre-tokenizing your text data and using a simplified analyzer:
```
PUT message_ext_index
{
"mappings": {
"properties": {
"message_ext": {
"type": "text",
"term_vector": "with_positions_offsets_payloads",
"store": true,
"analyzer": "whitespace"
}
}
}
}
```
This approach combines pre-processing with Elasticsearch's powerful analysis capabilities, offering both efficiency and depth in word frequency analysis.
<a name="LbYJO"></a>
## Conclusion:
The four solutions presented offer different advantages for word frequency analysis in Elasticsearch, catering to various requirements in terms of performance and detail. Alibaba Cloud Elasticsearch provides a flexible, powerful platform for deploying these solutions efficiently.<br />
Whether you're analyzing text data for SEO, content analysis, or any other purpose, these approaches can help you derive meaningful insights from your data.<br />
Ready to start your journey with Elasticsearch on Alibaba Cloud? Explore our tailored Cloud solutions and services to take the first step towards transforming your data into a visual masterpiece.<br />
[Please Click here, Embark on Your 30-Day Free Trial](https://c.tb.cn/F3.bTfFpS) | a_lucas |
1,873,219 | Enhancing React Development with npx: A Comparison with npm | Introduction: In the dynamic world of React development, efficient package management is crucial for... | 27,566 | 2024-06-04T03:30:00 | https://dev.to/imparth/enhancing-react-development-with-npx-a-comparison-with-npm-17p4 | react, node, npm, vite | **Introduction**:
In the dynamic world of React development, efficient package management is crucial for streamlined workflows. npm and npx are two essential tools in the Node.js ecosystem, each offering unique benefits. This article delves into the advantages of leveraging npx over npm in React development scenarios.
## Why Choose npx for React Development?
When initiating a new React project, utilizing `npx create-react-app todo` instead of `npm create-react-app todo` is the preferred method. Here's why:
**Latest Version Assurance**:
- `npx` ensures the latest version of `create-react-app` without requiring a global installation.
- When executing `npx create-react-app todo`, the tool checks for the availability of `create-react-app` globally. If not found, it downloads and executes it temporarily. This guarantees that you always use the most up-to-date version of `create-react-app` without worrying about version conflicts.
**Avoiding Version Conflicts**:
- Using `npm create-react-app todo` relies on `create-react-app` being globally installed, potentially leading to version conflicts.
- By contrast, `npx create-react-app todo` mitigates version conflicts by fetching and executing `create-react-app` locally, ensuring project integrity and stability.
In summary, `npx create-react-app todo` offers a seamless, version-agnostic approach to initiating React projects, making it the preferred method for React developers.
## Understanding the Difference:
While both npm and npx are integral parts of the Node.js ecosystem, they serve distinct purposes:
**npm (Node Package Manager)**:
- npm serves as the default package manager for Node.js and JavaScript.
- It facilitates package installation, management, versioning, and publishing, both globally and locally within projects.
**npx (Node Package Execute)**:
- npx is a tool bundled with npm (from version 5.2.0 onwards) used for executing npm packages.
- Unlike npm, npx allows for the temporary execution of packages without requiring global installation.
- It is commonly employed for one-time tasks, such as running commands or scripts from dependencies.
## Command Comparison:
To create a new React app using both npm and npx, consider the following commands:
**Using npm**:
```bash
npm install -g create-react-app
create-react-app my-react-app
```
**Using npx**:
```bash
npx create-react-app my-react-app
```
Both commands achieve the same outcome of scaffolding a new React project named "my-react-app" in the current directory. However, npx's approach ensures execution with the latest version of `create-react-app` without the need for a global installation.
**Conclusion**:
In React development workflows, leveraging npx offers significant advantages over npm, particularly in project initiation and management. By ensuring the latest package versions and mitigating version conflicts, npx enhances development efficiency and project integrity. React developers are encouraged to adopt npx as a preferred tool for executing packages, empowering seamless React project workflows and ensuring consistent project environments. | imparth |
1,861,616 | How do you optimize your code for performance and efficiency? | Optimizing code for performance and efficiency is essential for creating responsive and scalable... | 0 | 2024-06-04T03:30:00 | https://dev.to/learn_with_santosh/how-do-you-optimize-your-code-for-performance-and-efficiency-3c0h | performance, tips, development | Optimizing code for performance and efficiency is essential for creating responsive and scalable applications. Here are some straightforward strategies to ensure your code runs smoothly:
### 1. **Understand the Problem Domain** 🔍
- **Profiling**: Use tools to identify slow parts of your code. Focus on optimizing these areas.
- **Requirements Analysis**: Know your performance goals. Don't optimize too early—fix what's necessary.
### 2. **Efficient Algorithms and Data Structures** 🧠
- **Choose the Right Algorithm**: Use efficient algorithms. For example, use binary search (O(log n)) instead of linear search (O(n)) for sorted data.
- **Data Structures**: Use the right data structures. Hash tables are great for fast lookups, while arrays are good for ordered data.
### 3. **Code Optimization Techniques** 💡
- **Minimize Loops**: Reduce the number of iterations and avoid nested loops if possible. Example: Instead of looping twice to filter and then map an array, combine the operations into one loop.
- **Lazy Loading**: Load resources only when needed, such as images or data files.
- **Caching**: Store results of expensive operations for reuse. For example, cache the results of a complex calculation if it will be used multiple times.
### 4. **Memory Management** 🧠
- **Efficient Memory Usage**: Allocate only the memory you need. Use memory pools for objects that are frequently created and destroyed.
- **Garbage Collection**: Ensure proper management of object references to prevent memory leaks, especially in languages like Java or C#.
### 5. **Concurrency and Parallelism** ⚙️
- **Multi-threading**: Use multi-threading to perform tasks in parallel. Example: Use worker threads for independent tasks.
- **Asynchronous Processing**: Handle I/O-bound tasks efficiently using async/await in JavaScript or Python.
### 6. **Code Quality and Maintainability** ✨
- **Readability**: Write clear and understandable code. Complex optimizations can make code hard to read and maintain.
- **Modularity**: Break your code into smaller, reusable modules. This makes testing easier and helps isolate performance issues.
### 7. **Use of Libraries and Frameworks** 📚
- **Leverage Optimized Libraries**: Use well-maintained libraries and frameworks that are already optimized for performance. Avoid reinventing the wheel.
### 8. **Testing and Benchmarking** 🧪
- **Regular Testing**: Continuously test your code with real-world data to ensure optimal performance.
- **Benchmarking**: Compare different implementations to choose the fastest one. Use tools like Benchmark.js for JavaScript or pytest-benchmark for Python.
### 9. **Compiler and Language Features** 🚀
- **Compiler Optimizations**: Enable compiler optimizations like inlining and loop unrolling.
- **Language-Specific Features**: Use features designed for performance, such as Rust’s ownership model or C++’s move semantics.
### 10. **Monitoring and Feedback** 📊
- **Performance Monitoring**: Use tools to track performance metrics in production. Adjust and optimize based on real-world usage.
- **User Feedback**: Collect and address feedback from users about performance issues.
### Conclusion
Optimization is an ongoing process. Continuously profile, test, and refine your code to achieve the best performance. Balance efficiency with readability and maintainability for long-term success.
By following these strategies, you can significantly enhance the performance and efficiency of your code, resulting in faster, more responsive applications. 🚀 | learn_with_santosh |
1,876,077 | Panduan Pemula untuk Belajar Pemrograman: Bahasa Mana yang Harus Dipilih? | Halo, temen-temen! Mau Belajar Ngoding? Baca Ini Dulu! Kalian baru mau mulai belajar... | 0 | 2024-06-04T03:29:28 | https://dev.to/yogameleniawan/panduan-pemula-untuk-belajar-pemrograman-bahasa-mana-yang-harus-dipilih-3a71 | programming |
### Halo, temen-temen! Mau Belajar Ngoding? Baca Ini Dulu!
Kalian baru mau mulai belajar ngoding tapi bingung mau pilih bahasa pemrograman yang mana? Tenang, di artikel ini kita bakal bahas detail banget tentang bahasa pemrograman yang cocok buat pemula. Nggak cuma itu, kita juga bakal kasih contoh praktikum dan study case biar temen-temen bisa langsung praktek. Yuk, langsung aja kita mulai!
### Kenapa Harus Belajar Pemrograman?
Pertama-tama, kenapa sih harus belajar ngoding? Nih beberapa alasan keren:
- Peluang Karir: Banyak banget kerjaan keren di dunia IT. Mulai dari developer, data scientist, sampai hacker (eh, yang etis ya!).
- Gaji Tinggi: Profesi di bidang teknologi biasanya gajinya tinggi, bro.
- Kreativitas dan Logika: Ngoding itu asik banget buat ngembangin kreativitas dan kemampuan logika.
- Solusi Masalah: Temen-temen bisa bikin aplikasi yang membantu kehidupan sehari-hari atau bahkan dunia.
### Bahasa Pemrograman yang Cocok Buat Pemula
**1. Python**
Python itu kayak bahasa Inggrisnya dunia ngoding. Mudah dipelajari, sintaksnya sederhana, dan punya banyak pustaka (library) yang ngebantu banget buat berbagai tugas.
Kenapa Python?
- Sintaks Mudah: Gampang dipahami, cocok buat yang baru mulai.
- Serbaguna: Dipake buat web development, data science, machine learning, scripting, dll.
- Komunitas Besar: Banyak tutorial dan forum buat belajar.
Contoh Praktikum Python:
```python
# Program Python pertama
print("Hello, World!")
# Contoh penggunaan variabel
nama = "Yoga"
umur = 20
print(f"Nama saya {nama} dan umur saya {umur} tahun.")
# Contoh penggunaan fungsi
def sapa(nama):
return f"Halo, {nama}!"
print(sapa("Yoga"))
```
Study Case Python:
Membuat Aplikasi Penghitung BMI (Body Mass Index)
```python
# Fungsi untuk menghitung BMI
def hitung_bmi(berat, tinggi):
bmi = berat / (tinggi ** 2)
return bmi
# Fungsi untuk menentukan kategori BMI
def kategori_bmi(bmi):
if bmi < 18.5:
return "Kurus"
elif 18.5 <= bmi < 24.9:
return "Normal"
elif 25 <= bmi < 29.9:
return "Gemuk"
else:
return "Obesitas"
# Input dari user
berat = float(input("Masukkan berat badan (kg): "))
tinggi = float(input("Masukkan tinggi badan (m): "))
# Hitung dan tampilkan BMI
bmi = hitung_bmi(berat, tinggi)
print(f"BMI Anda: {bmi:.2f}")
print(f"Kategori BMI: {kategori_bmi(bmi)}")
```
**2. JavaScript**
JavaScript adalah bahasa yang wajib banget temen-temen pelajari kalo pengen jadi web developer. Bahasa ini bisa jalan di browser, jadi temen-temen bisa bikin website interaktif.
Kenapa JavaScript?
- Front-End Development: Bahasa utama buat bikin tampilan web yang interaktif.
- Belajar Asynchronous Programming: Bagus buat belajar konsep async dan callback.
- Banyak Framework: Banyak framework keren kayak React, Angular, dan Vue.js.
Contoh Praktikum JavaScript:
```javascript
// Program JavaScript pertama
console.log("Hello, World!");
// Contoh penggunaan variabel
let nama = "Yoga";
let umur = 25;
console.log(`Nama saya ${nama} dan umur saya ${umur} tahun.`);
// Contoh penggunaan fungsi
function sapa(nama) {
return `Halo, ${nama}!`;
}
console.log(sapa("Yoga"));
```
Study Case JavaScript:
Membuat To-Do List Sederhana di Browser
```html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>To-Do List</title>
</head>
<body>
<h1>To-Do List</h1>
<input type="text" id="todo-input" placeholder="Masukkan tugas baru">
<button onclick="tambahTugas()">Tambah</button>
<ul id="todo-list"></ul>
<script>
function tambahTugas() {
let input = document.getElementById('todo-input');
let tugas = input.value;
if (tugas) {
let li = document.createElement('li');
li.textContent = tugas;
document.getElementById('todo-list').appendChild(li);
input.value = '';
}
}
</script>
</body>
</html>
```
**3. Java**
Java adalah bahasa pemrograman yang kuat dan sering digunakan di perusahaan besar. Cocok buat temen-temen yang pengen serius di dunia enterprise atau bikin aplikasi Android.
Kenapa Java?
- Portable: Program Java bisa jalan di mana aja asal ada JVM (Java Virtual Machine).
- OOP: Bagus buat belajar konsep Object-Oriented Programming (OOP).
- Stabil: Dipake di banyak aplikasi perusahaan besar.
Contoh Praktikum Java:
```java
// Program Java pertama
public class HelloWorld {
public static void main(String[] args) {
System.out.println("Hello, World!");
}
}
// Contoh penggunaan variabel
public class Info {
public static void main(String[] args) {
String nama = "Yoga";
int umur = 30;
System.out.println("Nama saya " + nama + " dan umur saya " + umur + " tahun.");
}
}
// Contoh penggunaan fungsi
public class Sapa {
public static String sapa(String nama) {
return "Halo, " + nama + "!";
}
public static void main(String[] args) {
System.out.println(sapa("Yoga"));
}
}
```
Study Case Java:
Membuat Aplikasi Kalkulator Sederhana
```java
import java.util.Scanner;
public class Kalkulator {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.print("Masukkan angka pertama: ");
double angka1 = scanner.nextDouble();
System.out.print("Masukkan angka kedua: ");
double angka2 = scanner.nextDouble();
System.out.print("Pilih operasi (+, -, *, /): ");
char operasi = scanner.next().charAt(0);
double hasil;
switch (operasi) {
case '+':
hasil = angka1 + angka2;
break;
case '-':
hasil = angka1 - angka2;
break;
case '*':
hasil = angka1 * angka2;
break;
case '/':
if (angka2 != 0) {
hasil = angka1 / angka2;
} else {
System.out.println("Tidak bisa dibagi dengan nol!");
return;
}
break;
default:
System.out.println("Operasi tidak valid!");
return;
}
System.out.println("Hasil: " + hasil);
}
}
```
### Kesimpulan
Belajar pemrograman itu kayak perjalanan panjang yang penuh petualangan. Pilih bahasa yang sesuai dengan minat dan tujuan temen-temen. Python cocok buat yang pengen serba bisa dan mudah, JavaScript keren buat yang pengen fokus di web development, dan Java mantap buat yang serius di aplikasi enterprise dan Android.
Ingat, nggak ada bahasa pemrograman yang sempurna. Semua punya kelebihan dan kekurangan masing-masing. Yang penting, temen-temen harus konsisten belajar dan praktek. Semakin sering praktek, semakin jago temen-temen ngoding. Selamat belajar, bro!
Jangan lupa, ngoding itu diketik jangan dipikir!
| yogameleniawan |
1,876,075 | Cordless Screwdriver Safety Tips Every User Should Know | Keep Their Cordless Screwdriver Safe: Have A Look At Tips which is why The Cordless Screwdriver... | 0 | 2024-06-04T03:22:01 | https://dev.to/brenda_hernandezg_26bd74a/cordless-screwdriver-safety-tips-every-user-should-know-5b50 | screwdriver | Keep Their Cordless Screwdriver Safe: Have A Look At Tips which is why
The Cordless Screwdriver which was cordless a really must-have unit if you're handy plus device. This can be a unit that was versatile can enable you to quickly fix choices plus effortlessly. Having the drill that has been cordless you can drill holes, drive screws, plus perform a genuine quantity of perform. Nonetheless, if you do not managed plus worry, cordless screwdrivers trigger accidents. Check out recommendations to keep your along with your families safer when using the the screwdriver that has been cordless.
Advantages of a Cordless Screwdriver
The drill that was cordless the unit which was versatile may use in lots of various applications. This will be a unit that are must-have lovers being gurus that is DIY. Cordless screwdrivers was lightweight, portable, plus easy to use. They could be used effectively in tight areas the accepted spot in which a screwdriver that are antique be used. Also, cordless screwdrivers allow fast and bit which is straightforward, to assist you get through the drilling to task which was.
Innovation in Cordless Screwdrivers
Cordless screwdrivers or Electric Cordless Drill come with revolutionary characteristics rates that was adjustable, reversible action, plus adjustable clutches. These properties help the buyer control these devices's rate plus torque on the basis of the task at hand. In addition they cause the product best and even more simple to work with. Also, cordless screwdrivers has lithium-ion batteries that offer further power and remain much longer than antique batteries.
Safety Tips in making Use Of This Cordless Screwdriver
The Cordless Screwdriver which was cordless be dangerous and sometimes even used correctly like most power tech. Listed here are the safeguards which are few to check out:
1. constantly look at manufacturer's directions before utilizing the unit.
2. Wear protection goggles and ear protection.
3. Keep the tactile arms not even close to the bit even though unit had been utilized.
3. Usage simply the bit that's true the job.
5. keep the unit not close to offspring even.
6. turn the unit off if it's not used.
7. Stay focused in their task and steer clear of interruptions.
Just how to Create Use Of Cordless Screwdriver
By using a power screwdriver that was cordless effortless. Follow these processes that are simple
1. Charge the battery power before use.
2. Insert the bit into the tense plus chuck up it.
3. placed the unit to the specified price plus torque.
4. Place the bit regarding the screw concerns plus head that are apply moderate.
5. support the unit firmly plus strike the trigger to in exhibit it.
6. Release the trigger following the screw have been in place.
7. change through the device plus eradicate the bit when you are complete deploying it.
Service plus Quality of Cordless Screwdrivers
To be sure their Cordless Screwdriver that was lasts being cordless functionality precisely, you need to uphold it precisely. Take a look at battery pack plus charger pack sometimes plus alter them as long as they become harmed. Keep the unit lubricated plus clean, plus store it into the dry, safer location. Also, put money into the top-quality screwdriver which is matches that are cordless requirements. Decide on a model that has been durable, dependable, plus easy to use.
Applications of a Cordless Screwdriver
The screwdriver that are cordless be used within an selection of applications
1. Assembling furniture
2. pictures racks that are being are hanging
3. Installing door products
4. Restoring equipment which are electronic
5. Creating the treehouse
Cordless screwdrivers can be a versatile plus unit that is DIY which is essential plus specialists. They're easy to use plus have selection of revolutionary properties. Nonetheless, it's important to follow safeguards recommendations in order to avoid accidents. Constantly understand manufacturer's directions, usage safety gear, plus remain based on their task. Correctly maintain their device to considerably longer ensure it persists plus functions properly. With your means, you will keep their screwdriver that are electric screwdriver set safer use it effortlessly for picking a applications.
Source: https://www.kaleipowertools.com/application/power-screwdriver | brenda_hernandezg_26bd74a |
1,876,074 | Quantitative trading programming language evaluation | Summary In Chapters 1 and 2, we learned the basics of quantitative trading and the uses of... | 0 | 2024-06-04T03:21:12 | https://dev.to/fmzquant/quantitative-trading-programming-language-evaluation-5ghe | trading, programming, cryptocurrency, fmzquant | ## Summary
In Chapters 1 and 2, we learned the basics of quantitative trading and the uses of FMZ Quant tools. In this chapter, we will implement the actual trading strategies. If a worker wants to do something good, he must first sharpen his tools. To implement a trading strategy, you must first master a programming language. This section first introduces the mainstream programming languages in quantitative trading, as well as the characteristics of each programming language itself.
## What is a programming language?
Before learning a programming language, you must first understand the concept of "programming language." A programming language is a language that both humans and computers can understand. It is a standardized communication code. The purpose of a programming language is to use a human language to control a computer and tell the computer what we are going to do. The computer can execute instructions according to the programming language, and we can also write code to issue instructions to the computer.
Just as parents taught us to speak and teach us how to understand what other people are saying. After a long period of edification and self-learning, we have learned to speak without knowing it, and can understand the meaning of other children talking. There are many languages, including Chinese, English, French, etc., such as:
- Chinese: Hello world
- English: Hello World
- English: Hello everyone
If you use the programming language to display "Hello World" on your computer screen, this is the case:
- C language: puts ("Hello World");
- Java language: System.out.println("Hello World");
- Python language: print ("Hello World")
You can see that computer languages have their own specific rules, and there are many languages, and these language rules are the classification of programming languages that we need to explain for you today. In each category, we only need to remember the most basic rules. We can use these programming languages to communicate with the computer and let the computer run the corresponding strategy according to our instructions.
## Programming language classification
In order to facilitate reference and comparison, choose the quantitative trading programming language that suits you. We will categorize the six most commonly used programming languages: Python, Matlab/R, C++, Java/C#, EasyLanguage, and Visual programming Language ( As shown below).
We rate them by functional ability, speed, extension and learning difficulty. A score from 1 to 5, for example, a score of 5 on the functional range means powerful, and 1 point means less functionality. (As shown above) Visual programming and EasyLanguage are easy to learn and very new; Python has powerful extension capabilities and is suitable for developing more complex trading strategies; C++ programming is the fastest and more suitable for high-frequency traders.
But for each programming language, the evaluation is mainly for the application in the field of quantitative trading. And with the subjective component of the individual. You are also welcome to explore them yourself, Next, we will start to introduce these programming languages one by one.
## Visual programming
Visual programming has been around for a long time, This kind of "what you see is what you get" programming idea, equipped with a variety of control modules, just by drag and drop, you can build code logic, complete the trading strategy design, the process is like building blocks.
As shown above, the same procedure is only a few lines of code on the FMZ Quant trading platform visual programming. This greatly reduces the programming threshold, especially for traders who don't understand programming at all, which is a great operating experience.
Because the underlying implementation strategy of this visual programming is converted to C++, it has little effect on the running speed of the program. However, the functionality and scalability are weak, and it is impossible to develop a trading strategy that is too complicated and too refined.
## EasyLanguage
The so-called EasyLanguage refers to the programming language unique to some commercialized quantitative trading software. Although these languages also have some object-oriented features, they are mainly scripted in the application. In terms of grammar, it is also very close to our natural language. For beginners of quantitative trading, using EasyLanguage as a starting point is a good choice. For example, the M language on FMZ Quant platform.
This kind of scripting language has no problem in strategy backtesting and real market in its specific software, but in terms of expansion, it is often limited. For example, strategy developers cannot call external APIs. And at the speed of running, this scripting language runs on its own virtual machine, and performance optimization is as good as Java/C#.
## Python
As shown in the figure below, on Stackoverflow, the number of mainstream programming language accesses has not changed much in recent years, and only Python is on a tremendous rise. Python can be used for web development, machine learning, deep learning, data analysis, etc. It has become the most versatile language because of its flexibility and openness. The same is true in the field of quantitative investment. At present, the global quantitative platforms are mostly based on Python.
Python's basic data structure lists and dictionaries are very powerful and can meet almost all needs of data analysis. If you need a faster, more comprehensive data structure, NumPy and SciPy are recommended. These two libraries are basically called the standard library for Python scientific computing.
For financial engineering, the more targeted library is Pandas, with two data structures, Series and DataFrame, which are ideal for processing time series.
In terms of speed, Python is in the middle of the game, slower than C++, and faster than the EasyLanguage, mainly because Python is a dynamic language that runs at the normal speed as a pure Python language. But you can use Cython to statically optimize some functions to get close to the speed of C++.
As a glue language, Python is the number one in terms of scalability. In addition to being able to interface with other languages extensively, the design of the extension API is very easy to use. In terms of learning difficulty, Python has a simple syntax, high code readability, and easy entry.
## Matlab/R
Then there is Matlab and R language. These two languages are mainly oriented to data analysis. Language creator have done a lot of design for scientific operations in grammar, which is characterized by natural support for quantitative trading operations. However, the application range is limited, and it is generally used for data analysis and strategy backtesting. For trading system and strategy algorithm development, its ease of use and stability are less.
In addition, their speed and scalability are relatively poor, because Matlab and R language run on a unique language virtual machine. In terms of performance, their virtual machines are much worse than Java and C#. But because their grammar is closer to the mathematical expression formula, it is relatively easy to learn.
## C++
C++ is a general-purpose programming language that supports multiple programming patterns such as procedural programming, data abstraction, object-oriented programming, generic programming, and design patterns. You can implement all the functions you want to achieve in C++, but the biggest drawback of such a powerful language is that it is very difficult to learn, such as templates, pointers, memory leaks, and so on.
At present, C++ is still the preferred programming language for high-capacity, high-frequency trading. The reason is simple. Because C++ language features are easier to access the underlying layer of the computer, it is the most effective tool for developing high-performance backtesting and execution systems that process large amounts of data.
## Java/C#
Java/C# are static languages that run on virtual machines. Compared with C++, there is no array out of bounds, no coredump, thrown exceptions can accurately locate the error code, bring automatic garbage collection mechanism, no need to worry about memory Leak and so on. So in terms of grammar learning difficulty, they are also easier than C++. In terms of speed, because their virtual machines come with JIT functions compiled at runtime, the speed is just second only to C++.
But in terms of functionality, it is impossible to optimize the underlying trading system like C++. In terms of expansion performance, it is weaker than C++, because their extension needs to pass the C bridge, and the two languages themselves run on the virtual machine, so when expanding the function module, you need to cross one more Layer wall.
## To sum up
However, in the end, the quantitative programming language is not important, the important thing is the idea. The FMZ Quant M language and visual programming language are completely no problem as a stepping stone to the entry of quantitative trading. After the basics, the improvement is to continuously explore different market conditions and try to use more underlying language, such as C++.
“Design your strategy and trade your ideas.” From this perspective, the core of quantitative trading is still trading ideas. As a quantitative trader, you not only need to master the basic grammar and functions of the strategy writing platform, but also need to understand the trading concept in actual combat. Quantitative trading is only a tool and a carrier to embody different trading concepts.
## After-school exercises
1. What are the advantages of the Python language as a quantitative trading tool?
2. Try to write a few commonly used APIs by the M language?
## Next section notice
I believe that with the above introduction to the programming language, you must know how to choose it, then in the next few chapters, we will develop a quantitative trading strategy based on the classification of programming languages.
From: https://blog.mathquant.com/2019/04/18/3-1-quantitative-trading-programming-language-evaluation.html | fmzquant |
1,876,072 | Innovations in Compressed Natural Gas Storage | Innovations in Compressed Natural Gas Storage: A New Way to Power Your Vehicle Perhaps you have... | 0 | 2024-06-04T03:20:57 | https://dev.to/hdweyd_djjehhe_94b0dba4fc/innovations-in-compressed-natural-gas-storage-4i46 |
Innovations in Compressed Natural Gas Storage: A New Way to Power Your Vehicle
Perhaps you have considered travel an automobile fueled by compressed petrol that are Natural Gas Storage you're not alone. Many individuals are taking a look at cars that are Natural Gas Storage-powered about the importance it offers. We will explore the benefits that are huge innovation, security, use, plus application of Natural Gas Storage room.
Top features of CNG Storage
One of the best options that come with Natural Gas Storage space for storing was it is a petrol which are affordable contrast to diesel because petrol. Natural Gas Storage are wide ranging, and it also spending less every gallon of fuel equivalent. It indicates that you can just save money using Natural Gas Storageto power your vehicle as vehicle. In choice, CNG normally the gasoline that was cleaner-burning with their counterparts. It emits less toxins, such as for instance nitrogen oxides plus concern which was particulate which can be harmful to the environmental surroundings plus physical fitness that are specific. Ergo, using Natural Gas Compressor to power your car helps decrease polluting of this environment.
Innovation in Natural Gas Storage
Present innovations in Natural Gas Storage space for storing is rendering it significantly offered to the general public which are basic is fundamental. One of the most innovations that are notable be the petrol which is compressed was normal, which can be employed to keep CNG gasoline. The tanks that are more recent constructed from lighter equipment, such as for example carbon aluminum that is nutritional fibre, that produces them less hefty and even more effective. There clearly was also place ability that is better, to assist you push your car or truck further minus refueling. The Natural Gas Storage that has been storage area which is latest happen tested for security and are also authorized by regulatory agencies.
Security of Natural Gas Storage
Among the many dilemmas that can easily be Natural Gas Storage which was typical room safeguards. However, current advancements in CNG tank technology is creating them much safer than just before. The brand name tanks which can be brand new built to withstand anxiety that are higher offer security services, such as for instance anxiety relief valves plus shutoff valves. There is be tested to generally meet security that has been strict plus requirements. Thus, Natural Gas Storage space for storage happens to be considered the option that are safer vehicle fuel.
Using Natural Gas Storage
Utilizing Natural Gas Storage into area is not hard. You may possibly either make use of Natural Gas Storage tank within the real homes or refill your car's CNG tank during the CNG fueling spot. Home-based CNG strategies desire a compressor to fill the tank, and they also require considerably longer to fill out contrast to refueling at a recognized spot that was outside. Nevertheless, houses refueling is more convenient and that will conserve funds to the run that are very very long. Top section of Natural Gas Storage room are you currently save on fuel costs it was easy to use and may also help.
Quality of Natural Gas Storage
The standard of Natural Gas Storage Valves And Instruments generally a component that is consider which is essential. The brand name tanks which are newer created plus top-quality things as they are additionally built to withstand tough circumstances that are environmental. Consequently, you can sleeping knowing that was effortless their petrol test held precisely plus securely. In preference, Natural Gas Storage space for storing established fact due to its reliability, which really is a component that has been biggest their utilize being fully a vehicle fuel. If you are searching for a trusted plus petrol which was durable, Natural Gas Storage room is a solution which will be great.
Application of Natural Gas Storage
Natural Gas Storage area is an option that will be applications that are great are many of automobile fueling. It is employed to power generators, buses, also some products that are commercial. CNG space for storage can be used for both fixed plus applications being rendering that is mobile the fuel provide that has been versatile. It's also important to discover that CNG is domestically produced, that decrease the reliance on worldwide oils that are natural.
Natural Gas Storage Products is really a solution which are superb people searching for cleaner-burning plus a much more gasoline company that are affordable. Present innovations is CNG that is creating space Natural Gas Storage safer, more efficient, plus simpler to include. The modern tanks are made to withstand concerns which can be higher designed with top-quality elements, and could be properly used for both fixed plus applications which are mobile. Therefore simply why not begin considering CNG space for storing for the car since additional fueling criteria? Maybe it's what you ought to save money that assist the surroundings that are environmental can be ecological. Consequently, why don't we began CNG which are employing room our to time life which are everyday contribute to a greener future day.
Source: https://www.cngongboshi.com/Natural-gas-compressor | hdweyd_djjehhe_94b0dba4fc | |
1,876,071 | Learnings from GenAI on AWS at Deloitte workshop | I attended an in-personal workshop provided by Deloitte and AWS for NZ TechWeek24 on 22nd of May,... | 0 | 2024-06-04T03:18:45 | https://dev.to/notingin4k/learnings-from-genai-on-aws-at-deloitte-workshop-140n | workshop, genai, aws | I attended an in-personal workshop provided by Deloitte and AWS for NZ TechWeek24 on 22nd of May, noted down some key points that I probably can learn further with hands-on projects later.
### Key concepts:
- LLMOps
- Considerations for shortlisting LLMs
- Hallucination & Retrieval-Augmented Generation (RAG) pattern
- Embeddings
- Conversational Buffer Memory
- Prompt Engineering Techniques
- Fine Tuning (just lightly touched)
### Some use cases in Deloitte we went through:
- Customer support GenAI POC - understand customer query, extract relevant parts, draft email/slack responses (100% consistency of response msgs), and then provides links to knowledge base - 25% decreased request handling time
- Knowledge Base Summarisation for Chorus - [more to read](https://www.deloitte.com/nz/en/about/media-room/deloitte-new-zealand-achieves-aws-generative-ai-competency.html)
- Query Structured Data from internal supported vector data store - using the same stack/tools we used in labs below
### The stack and tools we used in the labs:
- Python boto3
- [Amazon Bedrock](https://aws.amazon.com/bedrock/) - fully managed service for using foundation models from Amazon and third parties
- [LangChain](https://python.langchain.com/) - Python and JS libraries, provides convenient functions for interacting with Amazon Bedrock’s models and related services like vector databases
- [Streamlit](https://streamlit.io/) - quickly creates web UI from Python without much frontend skills, great for POCs ([Streamlit API Reference](https://docs.streamlit.io/develop/api-reference))
- [Amazon Titan Embeddings](https://aws.amazon.com/blogs/machine-learning/getting-started-with-amazon-titan-text-embeddings/) - converts natural language text into numerical representations for later use cases such as searching or comparing semantic similarity
If you are interested in GenAI on AWS, there are a few [skill builder free labs for AI Readiness](https://skillbuilder.aws/generative-ai) to explore around.
| notingin4k |
1,876,070 | Keeping an Eye on Your AWS Infrastructure: A Deep Dive into CloudWatch | Keeping an Eye on Your AWS Infrastructure: A Deep Dive into CloudWatch Monitoring is... | 0 | 2024-06-04T03:16:54 | https://dev.to/virajlakshitha/keeping-an-eye-on-your-aws-infrastructure-a-deep-dive-into-cloudwatch-f6 | # Keeping an Eye on Your AWS Infrastructure: A Deep Dive into CloudWatch
Monitoring is crucial for any cloud infrastructure. Without effective monitoring, you could be blindsided by performance issues, security breaches, or unexpected costs. AWS CloudWatch is a powerful, fully managed service that provides comprehensive monitoring for your AWS resources and applications. It offers a wealth of features for collecting, analyzing, and visualizing metrics, logs, and events, enabling you to stay informed about the health and performance of your cloud environment.
This blog post will delve into the world of AWS CloudWatch, exploring its functionalities, use cases, and its place within the larger AWS ecosystem.
### A Comprehensive View of Your AWS Resources
CloudWatch is a central hub for all your monitoring needs. It allows you to:
* **Collect Metrics:** Track key performance indicators (KPIs) for your AWS resources like EC2 instances, databases, Lambda functions, and more. You can monitor metrics like CPU utilization, disk space, network traffic, and application latency.
* **Log Data:** Collect and analyze log data from your applications, services, and infrastructure components. This includes application logs, system logs, and custom logs.
* **Event Monitoring:** Track events occurring within your AWS environment, such as instance launches, security group changes, and API calls. This allows you to get alerts for specific events and understand the context of any issues.
### Five Common Use Cases for CloudWatch
**1. Performance Optimization:**
CloudWatch plays a crucial role in optimizing the performance of your AWS applications. You can use metrics like CPU utilization, memory usage, and network throughput to identify bottlenecks and optimize resource allocation. For example, you can set up alarms that trigger when a specific EC2 instance reaches a high CPU utilization threshold, indicating a need for more resources. This ensures your applications are always performing at their best.
**2. Troubleshooting and Debugging:**
CloudWatch logs are essential for troubleshooting and debugging applications. You can access application logs, system logs, and custom logs, providing valuable insights into the behavior of your applications. This data allows you to identify errors, trace the flow of requests, and debug performance issues. For example, you could use CloudWatch Logs to analyze logs from a Lambda function to identify why it's failing or to debug an unexpected behavior in your application.
**3. Cost Management:**
CloudWatch is a powerful tool for managing your AWS costs. By monitoring resource usage, you can identify areas where you can optimize costs. For example, you can track the running time of your EC2 instances and automatically scale them down or terminate them when they're not actively in use, saving you money.
**4. Security Monitoring:**
CloudWatch helps ensure the security of your AWS infrastructure. You can use event monitoring to track security-related events like access key changes, failed login attempts, and security group modifications. You can also set up alarms to notify you of suspicious activity, allowing you to quickly respond to potential threats.
**5. Application Health Monitoring:**
CloudWatch helps you monitor the overall health of your applications. You can use metrics like response times, error rates, and throughput to assess the health of your application and identify potential issues. You can also use CloudWatch dashboards to visualize key metrics and get a comprehensive view of your application's health.
### Alternatives and Comparison
While CloudWatch is a robust monitoring solution within the AWS ecosystem, other cloud providers also offer similar services.
* **Azure Monitor:** Azure's equivalent to CloudWatch, offering similar capabilities for monitoring Azure resources and applications.
* **Google Cloud Monitoring:** Google Cloud's monitoring solution, focusing on comprehensive observability and alerting.
Each of these services has its strengths and weaknesses. CloudWatch excels in its deep integration with AWS services, providing a unified experience for monitoring your entire AWS infrastructure. It also offers a wide range of features, including custom dashboards, event monitoring, and anomaly detection. However, for those primarily working with resources from another cloud provider, Azure Monitor or Google Cloud Monitoring might be a more seamless choice.
### Architecting Advanced Use Cases with CloudWatch
As a software and AWS solution architect, I can envision even more advanced use cases for CloudWatch, utilizing its features in conjunction with other AWS services.
**Scenario: Real-time application performance monitoring and auto-scaling with CloudWatch, Lambda, and EC2 Auto Scaling:**
Imagine a high-traffic web application running on AWS. To ensure optimal performance and scalability, we can leverage CloudWatch in conjunction with Lambda and EC2 Auto Scaling.
1. **Real-time Monitoring:** CloudWatch collects performance metrics from our EC2 instances, including CPU utilization, memory usage, and network throughput.
2. **Lambda Function for Scaling Decisions:** We can use a Lambda function triggered by CloudWatch alarms to automatically scale our EC2 instances based on pre-defined performance thresholds. For example, when CPU utilization exceeds 80%, the Lambda function can trigger an EC2 Auto Scaling group to add more instances, providing additional capacity.
3. **EC2 Auto Scaling:** The EC2 Auto Scaling group responds to the Lambda function's request by automatically launching new EC2 instances, ensuring our application can handle the increased load.
4. **Dynamic Scaling and Cost Optimization:** CloudWatch's real-time monitoring and the automated scaling mechanism enabled by Lambda and EC2 Auto Scaling ensure our application scales dynamically to meet demand. This helps optimize resource utilization and minimize costs, as we only pay for the resources we need.
This scenario demonstrates the power of CloudWatch when used in combination with other AWS services, enabling sophisticated automation and real-time optimization of our cloud infrastructure.
### Conclusion
AWS CloudWatch is a powerful and versatile service that plays a crucial role in monitoring your AWS resources and applications. By leveraging its capabilities for collecting, analyzing, and visualizing metrics, logs, and events, you can gain valuable insights into your infrastructure's health, performance, and security. CloudWatch enables you to proactively identify and address issues, optimize resource usage, and ensure the reliability of your cloud environment. By combining CloudWatch with other AWS services, you can create sophisticated automation and optimization strategies, taking your cloud infrastructure to the next level.
**References:**
* [AWS CloudWatch Documentation](https://aws.amazon.com/cloudwatch/)
* [AWS CloudWatch: Monitoring Your AWS Resources](https://docs.aws.amazon.com/whitepapers/latest/cloudwatch/cloudwatch.pdf)
* [Building a Scalable and Resilient Application with AWS CloudWatch](https://aws.amazon.com/blogs/devops/building-a-scalable-and-resilient-application-with-aws-cloudwatch/)
* [AWS CloudWatch: Monitoring and Management for Your Cloud Applications](https://aws.amazon.com/blogs/aws/cloudwatch-monitoring-and-management-for-your-cloud-applications/)
* [AWS CloudWatch: A Comprehensive Guide](https://www.guru99.com/aws-cloudwatch.html)
| virajlakshitha | |
1,876,038 | Next.js: Best Way to Organize Your Project Structure | Whenever I start a new Next.js project, I search for the best way to organize my file structure,... | 0 | 2024-06-04T03:16:04 | https://dev.to/jonathan-dev/nextjs-best-way-to-organize-your-project-structure-25o6 | nextjs, react, javascript, webdev | Whenever I start a new Next.js project, I search for the best way to organize my file structure, especially when I moved to App Router from Pages Router. There are [app routing folder and file conventions](https://nextjs.org/docs/getting-started/project-structure#app-routing-conventions) every Next.js project would need to follow, but apart from that, there are several ways to organize your project files.
Before showing how I typically structure my projects, I would like to briefly discuss the features [Next.js provides to help organize your project] (https://nextjs.org/docs/app/building-your-application/routing/colocation) and a few common strategies.
- Safe colocation by default
- Private Folders
- Router Groups
- src Directory
- Module Path Aliases
### Safe colocation by default
In the app directory, [nested folder hierarchy](https://nextjs.org/docs/app/building-your-application/routing#route-segments) defines the route structure. However, a route is not publicly accessible until a `page.js` or `route.js` file is added to a route segment. Even when a route is publicly accessible, the content returned by the `page.js` or `route.js` file is sent to the client. This means your project files can be safely colocated inside route segments in the `app` directory without accidentally being routable.
- `/app/settings/page.tsx` -> Routable
- `/app/settings/nav.tsx` -> Not Routable
- `/app/settings/constants.ts` -> Not Routable
- `/app/api/monkeys/route.ts` -> Routable
- `/app/api/monkeys/db.ts` -> Not Routable
### Private Folders
[Private folders](https://nextjs.org/docs/app/building-your-application/routing/colocation#private-folders) can be created by prefixing the folder name with an underscore: `_folderName`.
This hides the folder and its contents from the routing system.
- `/app/_settings/page.tsx` -> Not Routable
Private folders can be useful for separating UI logic from routing logic and avoiding potential naming conflicts with Next.js file conventions.
### Router Groups
[Route groups](https://nextjs.org/docs/app/building-your-application/routing/colocation#private-folders) can be created by wrapping a folder in parenthesis: `(folderName)`. This indicates the folder is for organizational purposes and should not be included in the route's URL path.
`/app/(admin)/dashboard/page.tsx` routes to `/dashboard`
### src Directory
Next.js allows storing application code in an optional `src` directory. This separates application code from project configuration files as they mostly live at the root of the project.
I used to ignore the `src` directory since it wasn't the default when creating a Next.js project, but I've been using it recently as I like the separation of root configuration files from the application code.
### Module Path Aliases
Next.js makes it easy to read and maintain imports across deeply nested project files with [Module Path Aliases](https://nextjs.org/docs/app/building-your-application/configuring/absolute-imports-and-module-aliases).
```TS
// Before
import { Button } from '../../../../../../components/button'
// After
import { Button } from '@/components/button'
```
## Project Organization Strategies
Next.js is nice enough to provide a few [strategies for organizing your project](https://nextjs.org/docs/app/building-your-application/routing/colocation#project-organization-strategies).
- Store project files outside of the app
- Store project files in top-level folders inside the app
- Split project files by feature or route
### Store project files outside of the app
Store all application code in shared folders at the root of your project and keep the `app` directory purely for routing purposes.
```
my-app/
├─ app/
│ ├─ settings/
│ │ ├─ page.tsx
├─ components/
│ ├─ settings.tsx
├─ utils/
│ ├─ server_actions.ts
├─ package.json
├─ README.md
```
I like this approach as this gives you more flexibility on how you want to structure your application code as well as decoupling Next.js file conventions.
### Store project files in top-level folders inside the app
```
my-app/
├─ app/
│ ├─ components/
│ │ ├─ settings.tsx
│ ├─ utils/
│ │ ├─ server_actions.ts
│ ├─ settings/
│ │ ├─ page.tsx
├─ package.json
├─ README.md
```
You'll need to be careful not to add an accidental `page.tsx` or `route.ts` to these top-level folders if you don't want to expose these routes publicly.
### Split project files by feature or route
Store globally shared application code in the root `app` directory and split more specific application code into the route segments that use them.
```
my-app/
├─ app/
│ ├─ components/
│ ├─ utils/
│ ├─ settings/
| | ├─ components/
│ | ├─ utils/
│ │ ├─ page.tsx
├─ package.json
├─ README.md
```
I've been trying a structure similar to this recently. I find it easy to navigate my code this way. This tightly couples your application code with the routing system. One worry I have is depending on the routing system changes in future updates, there could be potential conflicts when upgrading.
## Conclusion
There is no "right" or "wrong" way when it comes to organizing your files and folders in a Next.js project. As long as the structure is consistent across your project, choose a strategy that works for you and your team.
I'm curious to know how you organize your Next.js projects.
| jonathan-dev |
1,876,069 | Photographie de portrait professionnelle : créer des images intemporelles | Comprendre le sujet Pour capturer l’essence d’une personne, un photographe doit comprendre qui il... | 0 | 2024-06-04T03:13:49 | https://dev.to/gabrielgorgi54/photographie-de-portrait-professionnelle-creer-des-images-intemporelles-b33 | Comprendre le sujet
Pour capturer l’essence d’une personne, un photographe doit comprendre qui il photographie. Cela peut impliquer de rechercher les antécédents du sujet, de discuter de ses préférences et de comprendre le but du portrait. Qu’il s’agisse d’un portrait professionnel, d’un portrait de famille ou d’un projet artistique personnel, il est essentiel d’adapter l’approche aux besoins spécifiques et à la personnalité du sujet.
Le sens des affaires
En plus des compétences artistiques, un photographe portraitiste professionnel doit posséder un sens des affaires. Cela comprend la gestion des réservations, la tarification appropriée des services, la commercialisation de leur travail et le maintien d'une présence professionnelle en ligne. Le réseautage et l'établissement de relations au sein de l'industrie peuvent conduire à davantage d'opportunités et de références de clients.
https://www.gabrielgorgi.com | gabrielgorgi54 | |
1,876,068 | Unveiling the Essentials: A Beginner's Guide to Adobe XD | In the realm of user experience (UX) and user interface (UI) design, Adobe XD stands out as a... | 0 | 2024-06-04T03:13:26 | https://dev.to/epakconsultant/unveiling-the-essentials-a-beginners-guide-to-adobe-xd-394i | uiux | In the realm of user experience (UX) and user interface (UI) design, Adobe XD stands out as a powerful tool. Whether you're a seasoned designer or just starting your journey, understanding the core concepts of Adobe XD is essential. This article equips you with the building blocks to navigate this intuitive design platform.
## Design Nirvana: Artboards and Layers
Imagine a canvas where you can create multiple design layouts. That's the magic of artboards in Adobe XD. Each artboard represents a unique screen or page within your design, allowing you to craft the entire user flow of your application, website, or prototype.
Layers, much like layers in Photoshop, provide a hierarchical structure for your design elements. Text, buttons, images, and shapes – all reside within layers, enabling you to organize your design effectively. You can manage visibility, edit properties, and group elements for cleaner organization.
[How To Create Your First Trading Bot In PineScript TradingView Platform](https://www.amazon.com/dp/B0CHSJF3MP)
## Building Blocks: Essential Design Tools
Adobe XD offers a comprehensive toolbox to bring your design vision to life. Here are some key tools to get you started:
• Pen Tool: Craft precise vector shapes, perfect for creating custom icons, buttons, and UI elements.
• Rectangle Tool: Draw basic rectangles for layouts, buttons, and other building blocks.
• Text Tool: Add text content and customize fonts, styles, and alignment.
• Repeat Grid: Effortlessly replicate design elements like product listings or image galleries, saving you time and ensuring consistency.
These tools, along with others like the Image Tool and Line Tool, provide the foundation for building your user interface.
## The Power of Design Systems: Components and Libraries
Maintaining consistency across your design is crucial. Fortunately, Adobe XD offers features like Components and Libraries to streamline this process.
• Components: Create reusable design elements like buttons, navigation bars, or form fields. Any edits made to a component are automatically reflected wherever it's used, ensuring a consistent look and feel.
• Libraries: Organize design elements like colors, fonts, and character styles into reusable libraries. This allows for quick access and effortless application across your entire project.
Components and Libraries promote design efficiency and consistency, saving you time and effort in the long run.
## Prototyping: Bringing Your Design to Life
A core strength of Adobe XD lies in its robust prototyping capabilities. Transform static mockups into interactive prototypes that simulate user interactions. Link artboards together to create a realistic user flow, allowing stakeholders to experience the design in action.
Here's a glimpse into what you can achieve with prototyping:
• Button Clicks: Simulate button presses and navigate users to corresponding screens.
• Hover Effects: Showcase how elements change appearance on hover, mimicking real-world user interactions.
• Transitions: Add smooth transitions between screens, enhancing the overall user experience.
Prototyping empowers you to gather valuable user feedback early in the design process, leading to a more refined and user-centric final product.
## Collaboration Made Easy: Share and Preview
Adobe XD fosters seamless collaboration. Share your designs with colleagues and clients through generated links or cloud-based workflows. Users can then add comments and feedback directly on the design, facilitating effective communication and iterative improvement.
Additionally, the Preview mode allows stakeholders to experience your prototype on their mobile devices, providing valuable insights into the mobile user experience.
## The Learning Curve: Resources and Getting Started
The beauty of Adobe XD lies in its user-friendly interface and intuitive features. Even beginners can pick up the basics quickly. Here are some resources to get you started:
• Adobe XD Tutorials: Adobe offers a comprehensive library of tutorials covering various aspects of the software (https://helpx.adobe.com/xd/user-guide.html).
• Online Courses: Numerous online platforms offer in-depth courses on Adobe XD, catering to all skill levels.
• Practice Makes Perfect: The best way to learn is by doing! Experiment with the tools, explore different design concepts, and don't be afraid to get creative.
## In Conclusion
By grasping the fundamental concepts of Adobe XD – artboards, layers, design tools, components, libraries, prototyping, and collaboration features – you'll be well on your way to crafting user interfaces that are both beautiful and functional. With its intuitive interface and powerful features, Adobe XD empowers designers of all levels to bring their design visions to life. So, dive in, explore, and unleash your creativity!
| epakconsultant |
1,875,921 | [Game of Purpose] Day 16 | Today I completed watching tutorial about integrating Perforce in Unreal Engine. I learned about... | 27,434 | 2024-06-03T22:57:10 | https://dev.to/humberd/game-of-purpose-day-16-1pm3 | gamedev | Today I completed watching [tutorial](https://www.youtube.com/watch?v=7PRo8gK6SNM) about integrating Perforce in Unreal Engine.
I learned about World Partitioning where by default in a level all the items are stored in 1 file. It means that only 1 person can edit it at once. This makes it counter-productive in bigger levels.
In World Settings you can enable "Use External Actors" to make Unreal store all the instances in a level in separate files
You can see in a file tree that all the objects in a level are stored as separate files in "\_\_ExternalActors\_\_" and "\_\_ExternalObjects\_\_" folders.
In deciding what to use: Git or Perforce I was really hesitating. I knew git and it would have been way faster for me to use. However, I decided to take time making friends with Perforce. I read it's a standard in Gaming Industry the same as Git is in Programming Industry and I wanted to know why. What are its pros and cons.
Overall, I am pretty satisfied I spend a couple of hours learning Perforce. The major difference between Git is that Perforce makes sure only 1 person can edit a file at a time, since there is no way of resolving conflicts. "Depot" is a Git repository. "Stream" is a Git branch. "Submitting a changelist" is pushing a Git commit.
I am convinced I will use Perforce for my projects in Unreal Engine. It's free for up to 5 people, but the server cost is higher than Git ones. I currently use a 16$/month droplet with 1vCPU, 2GB of RAM and 70GB of SSD storage with 2TB free fransfer. The power of this server is not a problem, since I am the only person to use it. It has a CPU bottleneck when I upload heavy files, but I'll probably do it once in a while, so I can live with that. The problem is storage. Additional 100GB cost 10$/month. That'll be 26$/month and I'm not sure if this strategy is sustainable in the long term. Anyway, for now I'll probably leave this setup as it is, because I want to focus on Unreal Engine and not how to store its files.
| humberd |
1,852,294 | Ambassador Challenge: Earn your first C# Foundational Certification | This challenge will give you an introduction to C# language, providing you with the essential... | 0 | 2024-06-04T03:11:30 | https://dev.to/nahyer/ambassador-challenge-earn-your-first-c-foundational-certification-18a1 | csharp, beginners, programming, certification | This challenge will give you an introduction to C# language, providing you with the essential training you need to build robust applications in .NET and take the Foundational C# Certification exam.
Whether new or experienced, gain essential skills like variables, control structures, methods, and classes. Through hands-on exercises, apply these to real-world scenarios. Gain confidence in writing clear, efficient code.
## **What you will learn**
1. Write your first code using C#
2. Create and run simple C# console applications
3. Add logic to C# console applications
4. Work with variable data in C# console applications
5. Create methods in C# console applications
6. Debug C# console applications
## Steps
1. Head over to [Microsoft Learn](https://learn.microsoft.com/en-us/training) and click on Sign in to Create a Microsoft Learn Account. If you haven't already.
2. Complete the [C# Ambassador Challenge Registration Form](https://forms.office.com/r/i8kHgSf8QR) and Submit your Info.
3. Great Lets dive right in, to the [C# challenge](https://learn.microsoft.com/training/challenges?id=b4d528c1-471f-420a-a65c-4bed7ff0e0b4&WT.mc_id=cloudskillschallenge_b4d528c1-471f-420a-a65c-4bed7ff0e0b4&wt.mc_id=studentamb_306958)
4. On the Challenge Page, locate the "Ambassador Challenge: Earn your first C# Foundational Certif" Collection and Start the Challenge.
5. Work through the hands-on exercises and materials offered in the learning paths. Monitor your progress as you travel through the challenge. Take Knowledge Checks, perform activities, and earn badges to indicate your efforts along the way.
7. Upon finishing the C# Challenge, enjoy your victory! You've taken a huge step. Free LinkedIn premium vouchers will be delivered to Lucky Participants via E-mail.
---
## Claim your Certificate
To claim your certificate, you have to take the [Certification exam by freeCodeCamp](https://www.freecodecamp.org/learn/foundational-c-sharp-with-microsoft/foundational-c-sharp-with-microsoft-certification-exam/foundational-c-sharp-with-microsoft-certification-exam).
But before that, you have to Sign in and [link your Microsoft Learn Profile with FreeCodeCamp.](https://www.freecodecamp.org/learn/foundational-c-sharp-with-microsoft/write-your-first-code-using-c-sharp/trophy-write-your-first-code-using-c-sharphttps://www.freecodecamp.org/learn/foundational-c-sharp-with-microsoft/write-your-first-code-using-c-sharp/trophy-write-your-first-code-using-c-sharp)
 You are ready. Don't worry it's not monitored nor timed. Only 80 questions. You need to correctly answer at least 70% of the questions to earn your certification.
_**MAY THE FORCE BE WITH YOU!!**_
| nahyer |
1,875,444 | Generics in Rust: murky waters of implementing foreign traits on foreign types | This post is about what bothered me for a while in generic Rust before I could clarify what's going... | 0 | 2024-06-04T03:11:12 | https://dev.to/iprosk/generics-in-rust-murky-waters-of-implementing-foreign-traits-on-foreign-types-584n | rust, generics, numeric, beginners | This post is about what bothered me for a while in generic Rust before I could clarify what's going on (sort of), namely, implementing _foreign trait on foreign types_, especially, in the context of Rust's way of "operator overloading".
## We can't do it, or can we?
First, there is no mystery, right? [The Rust Book](https://doc.rust-lang.org/book/ch10-02-traits.html) is pretty clear on this matter.
> But we can’t implement external traits on external types. For example, we can’t implement the Display trait on `Vec<T>` within our aggregator crate, because Display and `Vec<T>` are both defined in the standard library and aren’t local to our `aggregator` crate. This restriction is part of a property called coherence, and more specifically the orphan rule, so named because the parent type is not present.
So if we try to write something like this in the Playground:
```
impl From<usize> for f64 {
// -- snippet --
}
```
the compiler immediately reminds us about this _orphan rule_
```
error[E0117]: only traits defined in the current crate can be implemented for primitive types
```
Nice and clear! Now, if we replace these lines with generics, the compiler error is different (and in a "slight" logical contradiction with the first error message), which hint that something is not so simple as advertised
```
impl<T, U> From<T> for U {
// -- snippet --
}
```
```
error[E0210]: type parameter `U` must be used as the type parameter for some local type (e.g., `MyStruct<U>`)
```
When we look into a detailed explanation of `error[E0210]`, we find our intuition was right:
> When implementing a foreign trait for a foreign type, the trait must have one or more type parameters. A type local to your crate must appear before any use of any type parameters.
So we can do it in Rust, can't we? But what about [The Book](https://doc.rust-lang.org/book/ch10-02-traits.html)?
## How can `nalgebra` do it?
Looking into reputable library crates such `nalgebra` also raises questions. Let's try, for example:
```
use nalgebra::Vector3;
fn main() {
let v = Vector3::new(1.0, 2.0, 3.0);
println!("{:?}", v * 3.0);
println!("{:?}", 3.0 * v);
}
```
It compiles and produces what's expected, and everything look alight. But how is that possible?
The first expression is, of course, pretty standard: ` v * 3.0` requires implementing `std::ops::Mul<f64>` trait with `Output = Vector3` on `Vector3`. However, `3.0 * v` requires `std::ops::Mul<Vector3>` on the build-in type `f64`, which is nothing but _implementing a foreign trait on a foreign type_ in direct violation of the [The Book](https://doc.rust-lang.org/book/ch10-02-traits.html).
Looking into the [`nalgebra` source code](https://github.com/dimforge/nalgebra/blob/dev/src/base/ops.rs), we find that the first expression is implemented using generics
```
macro_rules! componentwise_scalarop_impl(
($Trait: ident, $method: ident, $bound: ident;
$TraitAssign: ident, $method_assign: ident) => {
impl<T, R: Dim, C: Dim, S> $Trait<T> for Matrix<T, R, C, S>
where T: Scalar + $bound,
S: Storage<T, R, C>,
DefaultAllocator: Allocator<T, R, C> {
//
// -- snippet --
//
}
}
}
);
```
The macro declaration is not so important in this case. More important is that right-multiplication by a scalar is generic, and all metavariables in the macro pattern simply bind to identifies.
Left multiplication by a scalar is completely different. It is not generic, macro pattern matcher binds to types with repletion patterns
```
macro_rules! left_scalar_mul_impl(
($($T: ty),* $(,)*) => {$(
impl<R: Dim, C: Dim, S: Storage<$T, R, C>> Mul<Matrix<$T, R, C, S>> for $T
// -- snippet --
)*}
);
left_scalar_mul_impl!(u8, u16, u32, u64, usize, i8, i16, i32, i64, isize, f32, f64);
```
The last line explicitly instantiates implementations for built-in types.
So why is it different?
## We can do what we can't
Finally, I found the answer in the [RFC Book](https://rust-lang.github.io/rfcs/) (RFC stands for Request For Comments).
[RFC 2451](https://rust-lang.github.io/rfcs/2451-re-rebalancing-coherence.html) from 2018-05-30 that starts with the following lines:
> For better or worse, we allow implementing foreign traits for foreign types.
That's it! That's the answer.
Then it becomes more interesting:
> This change isn’t something that would end up in a guide, and is mostly communicated through error messages. The most common one seen is E0210. The text of that error will be changed to approximate the following:
Then follows the details of E0210 that I have already mentioned above. Together with [RFC 2451](https://rust-lang.github.io/rfcs/2451-re-rebalancing-coherence.html) it clarifies a little bit when we can implement foreign traits for foreign types and when we cannon. One more details from these documents:
> When implementing a foreign trait for a foreign type, the trait must have one or more type parameters. A type local to your crate must appear before any use of any type parameters. This means that impl<T> ForeignTrait<LocalType<T>, T> for ForeignType is valid, but impl<T> ForeignTrait<T, LocalType<T>> for ForeignType is not.
This works in the following example for left-scalar multiplication from my little library of generic Bezier curves that I used for illustration in [previous posts](https://dev.to/iprosk/generics-in-rust-visualizing-bezier-curves-in-a-jupyter-notebook-part-3-565n)
```
impl<T, const N: usize> Mul<Bernstein<T, f64, {N}>> for f64 where
T: Copy + Mul<f64, Output = T>,
[(); N]:
{
// -- snippet --
}
```
In this example a foreign trait `std::ops::Mul<T>` specialized on a local generic type `Bernstein<T, U, N>` is implemented for a foreign type `f64` similar to example above with `left_scalar_mul_impl` from `nalgebra` crate. Purely generic variant of this implementation
```
impl<T, U, const N: usize> Mul<Bernstein<T, U, {N}>> for U where
T: Copy + Mul<U, Output = T>,
U: Copy,
[(); N]:
{
type Output = Bernstein<T, U, {N}>;
fn mul(self, rhs: Bernstein<T, U, {N}>) -> Self::Output {
// -- snippet --
}
}
```
gives already familiar compiler error [E0210](https://doc.rust-lang.org/error_codes/E0210.html).
## Summary
We can implement foreign traits on foreign types in Rust with caveats. However, this behavior is not in [The Rust Book](https://doc.rust-lang.org/book/ch10-02-traits.html) yet, and is communicated mostly through [E0210](https://doc.rust-lang.org/error_codes/E0210.html) and [RFCs](https://rust-lang.github.io/rfcs/2451-re-rebalancing-coherence.html). Pure generics do not work, which, according to [RFC 2451](https://rust-lang.github.io/rfcs/2451-re-rebalancing-coherence.html), looks like a technical difficulty that may be revised in the future.
| iprosk |
1,876,067 | Shanghai Jinli Special Rope Co., Ltd: Your Off-Road Towing Expert | Innovation Shanghai Jinli Special Rope Co., Ltd strives to boost their products or services. They use... | 0 | 2024-06-04T03:05:41 | https://dev.to/brenda_hernandezg_26bd74a/shanghai-jinli-special-rope-co-ltd-your-off-road-towing-expert-3boe | off, road, rope | Innovation
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Source: https://www.cneema.com/application/recovery-rope | brenda_hernandezg_26bd74a |
1,876,066 | PRAAMS - Your ultimate investment tool | PRAAMS is a web and mobile platform for easy and complete investment analysis of 110,000 stocks and... | 0 | 2024-06-04T03:05:14 | https://dev.to/praams/praams-your-ultimate-investment-tool-505k | finance, software, investment, stocks | PRAAMS is a web and mobile platform for easy and complete investment analysis of 110,000 stocks and bonds, instant idea discovery, and intuitive portfolio construction & management. Created by professionals, for professionals, our comprehensive solution empowers you to analyse, compare, and pick stocks and bonds like an experienced research analyst-risk manager. It only takes seconds to analyse any stock or bond, construct an efficient portfolio, analyse the existing portfolio, and find actionable ideas to optimise it.
[https://praa.ms](https://praa.ms) | praams |
1,876,060 | Pump Up the Volume: Adding an Audio Player to your Flutter App | Incorporating an audio player into your Flutter application unlocks a world of possibilities. Imagine... | 0 | 2024-06-04T02:52:38 | https://dev.to/epakconsultant/pump-up-the-volume-adding-an-audio-player-to-your-flutter-app-4ge0 | flutter | Incorporating an audio player into your Flutter application unlocks a world of possibilities. Imagine an engaging fitness app with motivational tunes, a language learning app with immersive audio lessons, or a meditation app with calming soundscapes. This article will guide you through the process of adding an audio player to your Flutter app, step-by-step.
## Choosing the Right Tool
The first step is selecting a suitable audio player package. Popular options include:
• audioplayers: A well-established package offering playback functionalities for local files, assets, and URLs.
• just_audio: Another popular choice, known for its efficiency and advanced features like speed control and audio mixing.
For this tutorial, we'll be using audioplayers due to its simplicity.
Setting Up the Project
Ensure you have a Flutter project created and ready.
## Installation and Dependencies
Next, add the audioplayers package to your pubspec.yaml file:
YAML
dependencies:
audioplayers: ^0.22.0
Run the following command in your terminal to install the package:
flutter pub get
## Adding Audio Files
There are three ways to include audio files in your Flutter app:
1.Assets: Place your audio files in a folder named assets within your project directory.
2.Local Files: You can access audio files stored on the user's device using additional packages like file_picker.
3.Remote URLs: Play audio files streamed directly from the internet.
## Building the UI
Now comes the fun part - designing the user interface for your audio player. Here are some essential elements to consider:
• Play/Pause Button: A clear button to initiate and stop playback.
• Seek Bar: A slider to allow users to navigate through the audio file.
• Playback Time: Display the current position within the audio file and the total duration.
• Volume Control: A slider to adjust the audio volume.
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Use Flutter's rich set of widgets to create a visually appealing and user-friendly interface for your audio player.
## Implementing Playback Functionality
Let's dive into the code to control the audio playback. Here's a basic example using the audioplayers package:
Dart
```
import 'package:audioplayers/audioplayers.dart';
class MyApp extends StatefulWidget {
@override
_MyAppState createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
AudioPlayer player = AudioPlayer();
bool isPlaying = false;
String url = 'your_audio_file.mp3'; // Replace with your file path or URL
void playAudio() async {
if (isPlaying) {
await player.pause();
} else {
await player.play(url);
}
setState(() {
isPlaying = !isPlaying;
});
}
@override
Widget build(BuildContext context) {
return MaterialApp(
// Your app UI here
floatingActionButton: FloatingActionButton(
onPressed: playAudio,
child: Icon(isPlaying ? Icons.pause : Icons.play_arrow),
),
);
}
}
```
This code creates an AudioPlayer instance, a boolean variable to track the playback state, and a string to store the audio file path or URL. The playAudio function handles play/pause functionality. It checks the current playback state and either pauses or plays the audio based on the isPlaying variable. The UI is updated accordingly using setState.
This is a basic example, and you can expand on it to include features like:
• Seek bar implementation to allow users to jump to specific positions within the audio.
• Updating the current playback time based on the player's position.
• Adding functionalities like stop, volume control, and playlist management.
## Additional Resources
For a deeper dive into audio functionalities in Flutter, explore the documentation of the chosen audio player package and refer to online tutorials for more advanced implementations. With a little effort, you can integrate a powerful and user-friendly audio player into your Flutter app, enriching the user experience.
| epakconsultant |
1,875,771 | How to Find Open Source Projects to Contribute To | If you want to learn how to find open source projects to contribute to, this post offers a list of ways to find the right project to contribute to. | 27,584 | 2024-06-04T03:05:00 | https://opensauced.pizza/docs/community-resources/how-to-find-open-source-projects-to-contribute-to/ | opensource, beginners | ---
title: How to Find Open Source Projects to Contribute To
published: true
description: If you want to learn how to find open source projects to contribute to, this post offers a list of ways to find the right project to contribute to.
tags: opensource, beginners
cover_image: https://dev-to-uploads.s3.amazonaws.com/uploads/articles/064vd0ng9uymh35lcon4.png
# Use a ratio of 100:42 for best results.
published_at: 2024-06-04 03:05 +0000
canonical_url: https://opensauced.pizza/docs/community-resources/how-to-find-open-source-projects-to-contribute-to/
series: Getting Started in Open Source
---
One of the top questions I get is “How do I find an open-source project to contribute to?” It’s a fair question because there’s a lot of encouragement to contribute, but not a clear path to find the right issue for you. The truth is that maybe you shouldn't be looking for a place to contribute at all. Maybe you need to understand what your real goals are and start by building something you need, understanding open source projects and communities, and approaching contributions with a goal to improve the project rather than improving your resume.
## Start by Building Something You Need
When you build something for yourself, you develop a deeper understanding of your own goals, requirements for a project, and how to solve specific problems.
When you're building for yourself, you become more familiar with the complexity of coding, problem-solving, and project management.
Building your own project first also teaches valuable lessons in ownership and responsibility. You learn to see a project through from conception to implementation, and how to approach the challenges that come up along the way. What you learn from this experience will help you approach open source contributions with the right mindset and make informed and thoughtful contributions to projects that benefit their communities.
You'll learn more about how to align your efforts with the needs of the project and its users, which ultimately leads to a more rewarding and effective contribution experience.
### Understand Your Skills and Interests
Working on your open projects can help you better understand your skill-level and what you have the ability to take on. It’s so important to understand, in fact, that I wrote a whole post on it: [How to Assess Your Skill Level Before Contributing to Open Source](https://dev.to/opensauced/how-to-assess-your-skill-level-before-contributing-to-open-source-4pn3).
Once you have a good understanding of your skill level, you can better assess your ability to make meaningful contributions. If you’re a beginner, don’t take on a complicated issue that requires more experience. Likewise, if you are an experienced programmer, don’t take an issue that’s meant for someone in their early career stages.
## Use Open Source Software
Scouring the internet for a project to submit a one-off Pull Request (PR) to decreases your connection to the project and your desire to see it be successful. In [a recent Open Source Friday Stream with @ladykerr and @bdougieyo](https://youtu.be/tCEy-HZJckQ?t=2656), [Jan Ainali](https://app.opensauced.pizza/user/Ainali?range=360) pointed out that it's "much better [is] to contribute to something you use and where you would like to see an improvement."
When you are invested in a project, you’re more likely to navigate challenges, ask meaningful questions, and to grow and progress. *The more you use a product, the better contributor you’ll be, because you have a depth of understanding that helps you identify what’s useful for a project and its community.* Using open source software gives you access to opportunities to create bug reports or ask for new features because you understand the project and the user's expectations for the project. *Giving feedback is a valuable contribution.*
### Find an Open Source Community
When you're part of a community, you get access to insider information about the project. Listening in those communities, allows you to engage with the creators of the open source project. This is your opportunity to learn, understand, and grow. You can hear Kelsey Hightower talk about community [here](https://youtube.com/clip/UgkxFDg6UROC0QWZ0JTiEzgytNSEkVm1pKUW?si=PcCHFjKAgkBE3Wjy). Being involved in the community also gives you the context you need to create meaningful contributions, decreases the barrier to entry, and allows you to understand the type of project and support that you’ll be offered if you contribute to their projects.
When you are involved in a community, you are more likely to be driven by a genuine need to improve the software, which leads to more useful contributions. This mindset shift from self-improvement to community improvement not only benefits the open source project but also helps to create a more collaborative and supportive open source community.
### Talk to Other Open Source Contributors
Connecting with other contributors can be an important step in becoming an informed and effective community member. When you engage with them in their communities, follow them on social media, or interact with their content (reading and commenting on their blog posts, watching or commenting on their videos, listening to their podcasts, etc.), you can gain valuable insights into the open source ecosystem and the specific needs of the project. Understanding the pain points and how contributors discuss and address the issues helps you to avoid adding more work for the maintainers and instead becoming a positive force in the project.
Being well-informed about the community dynamics and project challenges means that your contributions are more likely to be meaningful and well-received. It also means you'll be better equipped to offer solutions that align with the project's goals and the community's expectations.
Additionally, tools like [StarSearch](https://oss.fyi/use-star-search) can help you identify key contributors to projects you're interested in. By finding those with overlapping experience or expertise, you can connect with the right people and build *meaningful* relationships.
### Look for Project Tags and Labels
Once you've created your own projects, used and learned about the project you're interested in contributing to, and joined and participated in the community, you can start looking at the issues to see if they're a good fit for your first contribution. Many open source projects use tags and labels like "good first issue" to indicate tasks that are suitable for beginners. These tags make it easier to find issues that match your skill level and provide a clear entry point for contributing.
### Write Your Own Issue
Remember, [good first issues don’t exist](https://opensauced.pizza/blog/good-first-issues-dont-exist); the best issue for you is probably the one that you write yourself.
## Takeaways
Contributing to open source shouldn't be about checking the box of things to do if you're an early career developer. It should be about making a meaningful contribution to a project that improves the project for all users. This will also go a long way towards making valuable and recognized contributions.
| bekahhw |
1,876,064 | Real-time Magic: Unveiling WebSockets and Firebase | The web has evolved from static pages to dynamic experiences. A key element in achieving this... | 0 | 2024-06-04T03:04:40 | https://dev.to/epakconsultant/real-time-magic-unveiling-websockets-and-firebase-2ni2 | websockets, firebase | The web has evolved from static pages to dynamic experiences. A key element in achieving this dynamism is real-time communication, where data updates are reflected instantly across connected devices.
## WebSockets: A Persistent Two-Way Street
Imagine a live chat application where messages appear instantly as they are typed. This is the power of WebSockets. It's a communication protocol that establishes a persistent, two-way connection between a web client (browser) and a web server. Unlike traditional HTTP requests, which are one-off exchanges, WebSockets allow for continuous back-and-forth communication.
Here's a simplified breakdown of how WebSockets work:
1.Handshake: The client initiates a connection by sending an HTTP request to the server, indicating its desire to upgrade to a WebSocket connection.
2.Upgrade: If the server supports WebSockets, it responds with an upgrade confirmation, establishing the persistent connection.
3.Data Exchange: Both the client and server can now send and receive data messages over the open connection.
This persistent connection enables real-time features like:
• Live Chat Applications: Messages are delivered instantly to all connected users.
• Collaborative Editing: Multiple users can edit a document simultaneously, seeing changes reflected in real-time.
• Real-time Dashboards: Stock prices, sensor data, or other frequently updated information can be displayed without constant page refreshes.
However, implementing WebSockets directly can be complex, requiring developers to handle the low-level details of the protocol. This is where Firebase comes in.
[What is web development, how to learn web development: How to Learn Web Development](https://www.amazon.com/dp/B0CHPNWN2J)
## Firebase: A Platform for Real-time Magic
Firebase, developed by Google, is a mobile and web application development platform that offers a suite of services, including a robust real-time database. While Firebase utilizes WebSockets under the hood for real-time communication, it abstracts away the complexities, providing a simpler and more manageable solution for developers.
## Here's what Firebase offers:
• Real-time Database: Store and synchronize data across devices in real-time.
• Cloud Firestore: A flexible NoSQL database with real-time capabilities.
• Authentication: User authentication and authorization features.
• Cloud Functions: Serverless functions triggered by database events or HTTP requests.
Firebase simplifies real-time development by:
• Pre-built Libraries: Firebase provides client-side libraries (JavaScript, Java, etc.) that handle the underlying WebSocket communication. Developers can focus on their application logic.
• Event-driven Model: Developers define functions to be triggered when data changes in the database. This eliminates the need for manual polling for updates.
• Scalability: Firebase manages the infrastructure, ensuring scalability as your application grows.
## Choosing the Right Tool
The choice between WebSockets and Firebase depends on your project requirements:
• Fine-grained Control: If you need complete control over the WebSocket connection and data format, implementing WebSockets directly might be preferable.
• Rapid Development: For faster development and a managed solution, Firebase is an excellent choice. Its built-in features and event-driven model streamline real-time functionality.
Conclusion
WebSockets provide the foundation for real-time communication, while Firebase offers a higher-level abstraction with additional features. Understanding both these concepts empowers you to choose the right tool for your project and build dynamic and engaging web applications.
Further Exploration:
For a deeper understanding of WebSockets, refer to https://developer.mozilla.org/en-US/docs/Web/API/WebSocket. Explore the Firebase documentation (https://firebase.google.com/) to delve into its real-time capabilities and other services.
| epakconsultant |
1,876,063 | Create Test REST APIs in Seconds! 🚀 | If you're a frontend developer looking to create test REST APIs quickly and easily, look no further!... | 0 | 2024-06-04T02:59:49 | https://dev.to/miguelrodriguezp99/create-test-rest-apis-in-seconds-cag | frontend, api, javascript, backend | If you're a frontend developer looking to create test REST APIs quickly and easily, look no further! This free tool is a game-changer, allowing you to set up APIs in seconds without any deployments. Here’s what it offers:
- GET, POST, PUT, and DELETE Methods: Support for all standard HTTP methods ensures you can create comprehensive API functionalities for your applications.
- Random Data for Responses: Generate random data for your API responses, making it perfect for testing various scenarios and edge cases.
- HTTPS and CORS Support: Enjoy seamless integration with your projects, thanks to built-in HTTPS and CORS support.
- No Deployments Needed: Skip the hassle of deploying servers; this tool works right out of the box.
This resource is an essential addition to any developer's toolkit, simplifying the process of API development and testing. Try it out and experience the ease of creating test REST APIs in seconds!
Here's the link: https://retool.com/api-generator | miguelrodriguezp99 |
1,876,062 | Understanding the Fundamentals: A Guide to CodeIgniter's Core Concepts | CodeIgniter is a free and open-source PHP framework that streamlines the web development process. By... | 0 | 2024-06-04T02:58:31 | https://dev.to/epakconsultant/understanding-the-fundamentals-a-guide-to-codeigniters-core-concepts-e7n | php | CodeIgniter is a free and open-source PHP framework that streamlines the web development process. By following a Model-View-Controller (MVC) architecture, it promotes code organization, maintainability, and scalability. This article unveils the fundamental concepts of CodeIgniter, equipping you to build robust web applications.
## The Power of MVC
MVC is a foundational principle in CodeIgniter. It separates an application's logic into three distinct layers:
1.Model: This layer interacts with the database, handles data retrieval, manipulation, and business logic. It acts as the data access layer, shielding the controller and view from the complexities of database interaction.
2.Controller: The controller acts as the brain of the application. It receives user requests (through URLs), interacts with the model to fetch or process data, and determines which view to display. The controller plays a crucial role in directing the flow of the application.
3.View: The view layer focuses on presentation. It uses HTML, CSS, and potentially PHP to display data received from the controller. This separation ensures clean and maintainable code, as the view solely focuses on presentation logic.
By utilizing MVC, CodeIgniter promotes well-structured and organized code. Developers can work on each layer independently, leading to faster development, easier maintenance, and improved code reusability.
## Delving into CodeIgniter's Architecture
CodeIgniter offers a pre-defined directory structure that promotes organization and simplifies project management. Here's a breakdown of some key directories:
• application: This directory houses the core components of your application, including models, controllers, views, and configurations.
• system: This directory contains core CodeIgniter libraries and helper functions. Modifying files here is generally not recommended as it can lead to conflicts during upgrades.
Understanding this structure is vital for navigating and organizing your CodeIgniter project effectively.
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## Built-in Libraries and Helpers
CodeIgniter provides a rich set of built-in libraries and helpers that simplify common development tasks. These include:
• Database libraries: Interact with various databases like MySQL, PostgreSQL, and more.
• Form validation library: Ensures user-submitted data adheres to defined rules.
• Session management library: Manage user sessions and store user data.
• Security helpers: Enhance application security by providing functions for encryption, input validation, and more.
Leveraging these libraries saves developers time and effort, allowing them to focus on core application logic.
## Routing: Mapping URLs to Controllers
CodeIgniter uses a routing system to map incoming URLs to specific controllers and functions within those controllers. This allows you to define clean and user-friendly URLs for your application. For instance, a URL like /products/view/123 could be mapped to the view function within the products controller, passing the product ID (123) as an argument.
Putting it all Together: Building a Simple CodeIgniter Application
Imagine a basic application displaying a list of products. Here's a simplified breakdown of how CodeIgniter would handle it:
1.The user visits the URL /products.
2.CodeIgniter's routing system identifies the products controller and its default function (often index).
3.The products controller interacts with the model to retrieve a list of products from the database.
4.The retrieved data is passed to the products view.
5.The products view iterates through the data and displays the list of products using HTML and potentially PHP for formatting.
This is a simplified example, but it demonstrates how CodeIgniter's MVC architecture facilitates the flow of data from user interaction to data retrieval and presentation.
## Benefits of using CodeIgniter
By embracing CodeIgniter, you gain several advantages:
• Rapid Development: The pre-defined structure and built-in libraries accelerate development.
• Improved Code Organization: MVC promotes clean and maintainable code.
• Security Features: Built-in security features help protect your application from vulnerabilities.
• Active Community: A large and active community provides support and resources.
While CodeIgniter might not be the trendiest framework today, its focus on simplicity and ease of use makes it a valuable tool for developers, especially those new to web development with PHP.
| epakconsultant |
1,876,061 | Day 3 | Today should be the 4th day but yesterday I was off so I didn't continue, but today I punished myself... | 0 | 2024-06-04T02:54:04 | https://dev.to/han_han/day-3-155 | webdev, html, css, 100daysofcode | Today should be the 4th day but yesterday I was off so I didn't continue, but today I punished myself for being careless yesterday, for today I learned quite a lot like colors in CSS, there are `rgb(red,green,blue)` and `rgba(red,green,blue,alpha)` and I learned about hex colors which consist of (0,1,2,3,4,5,6,7,8,9, A,,B,C,D,E,F) and `hsl(hue,saturation,light)` and for other things I also learned about `linear-gradient()` to adjust the combination of a color then learned about box-shadow and Alhamdulillah understood it | han_han |
1,876,059 | Ace Your Odoo Certification with Our Top-Rated Udemy Course! | 🔥 Exciting news! 🔥 Our Udemy course for Odoo 17 Functional Certification prep is a massive hit,... | 0 | 2024-06-04T02:50:16 | https://dev.to/odooexpert/ace-your-odoo-certification-with-our-top-rated-udemy-course-4no7 | 🔥 **Exciting news!** 🔥 Our Udemy course for Odoo 17 Functional Certification prep is a massive hit, boasting a stellar rating from our amazing students! 🚀 If you're gearing up for the Odoo certification, this is the ultimate resource to help you succeed.
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#### Share the Knowledge
Know someone who would love to ace their Odoo certification? Share this post with your friends and colleagues. Your support and glowing reviews mean the world to us. Let's crush this certification together!
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Cheers to your success!
---
Get ready to take your Odoo skills to the next level and achieve certification success with our top-rated Udemy course. Enroll now and start your journey towards becoming an Odoo expert! | odooexpert | |
1,876,058 | The influence of lamp beads on the performance of LED display screens | As an important part of modern display technology, LED display screens are widely used in... | 0 | 2024-06-04T02:47:00 | https://dev.to/sostrondylan/the-influence-of-lamp-beads-on-the-performance-of-led-display-screens-2g9l | led, display, lamp | As an important part of modern display technology, [LED display screens](https://www.sostron.com/product?category=2) are widely used in advertising, information release, traffic signs and other fields. As the core component of LED display screens, lamp beads have a decisive influence on their performance. This article will explore the influence of lamp beads on the performance of LED display screens from eight key aspects.
1. Viewing angle
The viewing angle of LED display screens is determined by the viewing angle of lamp beads. Outdoor display screens usually use elliptical LEDs with a horizontal viewing angle of 100° and a vertical viewing angle of 50°, while indoor display screens tend to choose SMD LEDs with a horizontal and vertical viewing angle of 120°. Special uses, such as highway display screens, may only require a 30° circular LED. There is a trade-off between viewing angle and brightness. A larger viewing angle may reduce brightness, so it needs to be selected according to the specific application scenario. [Provide you with 7 differences between SMD LEDs and DIP LEDs. ](https://www.sostron.com/service/faq/7834)
2. Brightness
LED brightness is a key factor in determining the brightness of the display screen. High-brightness LEDs help save energy and maintain stability. With the chip brightness fixed, a smaller angle value will make a single LED brighter, but will reduce the viewing angle of the display. Generally, 100° LEDs are ideal for ensuring sufficient viewing angles. [Here is some knowledge about nit brightness. ](https://www.sostron.com/service/faq/4780)
3. Failure rate
A full-color display is composed of tens of thousands of red, green, and blue LEDs, and the failure of any color will affect the overall visual effect. Industry experience shows that the failure rate of LEDs should not be higher than 3/10,000 from assembly to aging before shipment for 72 hours.
4. Antistatic ability
As a semiconductor device, LED is very sensitive to static electricity, so antistatic ability is crucial to the life of the display. The failure voltage of the human body static mode test of LED should not usually be less than 2000V.
5. Lifespan
In theory, the lifespan of LED devices can reach 100,000 hours, far exceeding the working life of other components of the display. As long as the quality of LED devices is guaranteed, the working current is appropriate, and the PCB heat dissipation design is reasonable, LED devices will be one of the most durable components in the display.
6. Attenuation characteristics
After working for a long time, LED display screens may experience brightness decline and color inconsistency, which is mainly caused by the brightness attenuation of LED devices. High-quality LED devices can well control the brightness attenuation amplitude to extend the service life of the display screen.
7. Size
The size of LED devices affects the pixel distance and resolution of the display screen. Different LED sizes are suitable for display screens with different dot pitches and viewing distances. Increasing the size of LEDs can increase the display area and reduce the graininess, but may reduce the contrast; conversely, reducing the size of LEDs will increase the contrast but increase the graininess. [Provide you with a guide to LED commercial poster screen sizes and prices. ](https://www.sostron.com/service/faq/8095)
8. Consistency
The brightness, white balance, and color consistency of full-color display screens depend on the consistency of red, green, and blue LEDs. Display manufacturers usually require device suppliers to provide LEDs within a wavelength range of 5nm and a brightness range of 1:1.3. In addition, the angle consistency of LEDs is crucial to the consistency of white balance at different angles, affecting the fidelity of the video color of the display screen.
Conclusion
The quality of LED lamp beads directly affects the performance and life of LED display screens. Selecting the right lamp beads to ensure that they are optimized in terms of viewing angle, brightness, failure rate, antistatic ability, life, attenuation characteristics, size and consistency is the key to manufacturing high-quality LED displays. With the continuous advancement of technology, we expect LED displays to achieve higher performance and longer service life in the future.
Thank you for watching. I hope we can solve your problems. Sostron is a professional [LED display manufacture](https://sostron.com/about)r. We provide all kinds of displays, display leasing and display solutions around the world. If you want to know: [Comparison of synchronous and asynchronous control of LED display screens.](https://dev.to/sostrondylan/comparison-of-synchronous-and-asynchronous-control-of-led-display-screens-3opo) Please click read.
Follow me! Take you to know more about led display knowledge.
Contact us on WhatsApp：https://api.whatsapp.com/send/?phone=8613570218702&text&type=phone_number&app_absent=0 | sostrondylan |
1,876,057 | GSAP (GreenSock Animation Platform): Revolutionizing Web Animations | What is GSAP? GSAP is a JavaScript library developed by GreenSock that simplifies the creation of... | 0 | 2024-06-04T02:46:18 | https://dev.to/italohgs/gsap-greensock-animation-platform-revolutionizing-web-animations-14ga | What is GSAP?
GSAP is a JavaScript library developed by GreenSock that simplifies the creation of high-performance animations. It is widely used by developers and designers to create smooth and complex animations on websites and applications. GSAP offers a robust and flexible API, allowing precise and controlled animations on various elements of a page.
Key Features
Precise Tweening: GSAP enables tweening, which is the smooth transition between two states. With GSAP, you can animate virtually any CSS property, SVG attributes, JavaScript object properties, and more.
Timeline Control: One of GSAP's most powerful features is the ability to create timelines. Timelines allow chaining multiple animations, controlling the timing and sequence of each, which is essential for creating complex animations.
Plugins and Extensions: GSAP offers a variety of plugins that extend its functionality, such as ScrollTrigger for scroll-based animations, Draggable for creating draggable elements, and more.
Compatibility and Performance: GSAP is compatible with all major browsers and optimized for high performance, ensuring smooth animations even on older devices.
Advantages of Using GSAP
Ease of Use: GSAP's API is intuitive and well-documented, making the learning curve easy for new users.
Flexibility: GSAP allows animating anything that can be changed with JavaScript, from CSS properties to object data.
Active Community: The community around GSAP is active and supportive, with numerous tutorials, forums, and examples available.
Total Control: With GSAP, developers have complete control over the timing, sequence, and interaction of animations, allowing for the creation of personalized and unique experiences.
Practical Example
Let's create a simple example to demonstrate how to use GSAP to animate an HTML element.
```
html
Copy code
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>GSAP Example</title>
<style>
#box {
width: 100px;
height: 100px;
background-color: blue;
position: absolute;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
}
</style>
</head>
<body>
<div id="box"></div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/gsap/3.10.4/gsap.min.js"></script>
<script>
gsap.to("#box", {duration: 2, x: 300, rotation: 360, backgroundColor: "red"});
</script>
</body>
</html>
```
In this example, we have a div with the id box. Using GSAP, we animate the box by moving it 300 pixels to the right, rotating it 360 degrees, and changing its background color to red over 2 seconds.
Conclusion
GSAP is an indispensable tool for developers and designers who want to create sophisticated and high-performance animations on the web. Its combination of ease of use, flexibility, and total control makes it the ideal choice for any project involving animations. If you haven't tried GSAP yet, now is the perfect time to explore its possibilities and take your animation skills to the next level. | italohgs | |
387,649 | Entendendo e Utilizando Tipos Condicionais (TypeScript) | Introdução Dentre as diversas ferramentas de tipagem avançada que o TypeScript provê,... | 0 | 2024-06-04T02:42:03 | https://dev.to/iagobelo/entendendo-e-utilizando-tipos-condicionais-typescript-40ib | typescript, beginners, programming | ## Introdução
Dentre as diversas ferramentas de tipagem avançada que o TypeScript provê, **tipos condicionais** são uma das mais importantes, pois nos dá habilidade de criar **tipos não uniformes**, ou seja, que podem variar conforme a entrada.
Sua sintaxe é análoga a do operador ternário do TypeScript, sendo que, a condição deve expressar um teste de relação entre os tipos.
Exemplo lado a lado:
```tsx
/*
* A condição pode ser qualquer tipo de operação que
* resulte em um boleano.
*/
const ternary = condition ? expr1 : expr2;
/*
* A condição deve ser criada testando a relação entre
* os dois tipos, sempre utilizando o operador `extends`.
*/
type Conditional<T, U> = T extends U ? string : number;
```
## Condições simples
```tsx
type IsString<T> = T extends string ? true : false;
type R1 = IsString<'Hello'>;
// => true
type R2 = IsString<2>;
// => false
```
No exemplo acima, criamos o tipo `IsString` que verifica se `T` é atribuível a `string`, retornando `true` caso verdadeiro, ou `false` caso contrário.
Agora, observe atentamente o exemplo abaixo:
```tsx
type Is2020<T> = T extends true ? 'yes' : 'no';
const year = new Date().getFullYear() === 2020;
type R = Is2020<typeof year>;
// => 'yes' | 'no'
```
Indo direto para a última linha do exemplo, note que `Is2020<typeof year>` está retornando como resultado uma união entre os dois tipos possíveis especificados na sua assinatura, mas por quê? Para responder essa pergunta, temos que ter em mente que o TypeScript roda em tempo de desenvolvimento e não consegue inferir tipos de runtime, que no nosso caso, é o trecho `new Date().getFullYear() === 2020`. Como inferir não foi possível, recebemos como resultado uma **união** com todas as possibilidades.
## Condições encadeadas
Assim como um ternário comum, podemos encadear tipos condicionais e criar tipagens mais robustas baseadas em múltiplas regras.
```tsx
type IsFrontEndFramework<T> = T extends string
? T extends 'Angular'
? true
: T extends 'Vue'
? true
: T extends 'React'
? true
: 'Insert a valid framework.'
: never;
type R1 = IsFrontEndFramework<'React'>;
// => true
type R2 = IsFrontEndFramework<'Hello'>;
// => 'Insert a valid framework.'
type R3 = IsFrontEndFramework<920>;
// => never
```
## `Infer`indo Tipos
Até agora vimos que é possível encadear e criar condições variadas que cobrem uma infinidade de cenários, porém, em certos casos, ainda é muito trabalhoso ou praticamente impossível criar a *constraint* correta apenas utilizando condições simples. Para esses cenários mais complexos, temos a *keyword* `infer`, que auxilia na inferência de tipos dinâmicos dentro das nossas condições. A única **limitação** aqui é: você só poderá utilizar `infer` numa condição `extends`.
### Array
Vamos observar o exemplo a seguir, onde utilizamos `infer` para inferir o tipo de um array:
```typescript
type InferArrayType<A> = A extends Array<infer U> ? U : never;
type R1 = InferArrayType<Array<string>>;
// => string
type R2 = InferArrayType<Array<number>>;
// => number
type R3 = InferArrayType<Array<Array<string>>>;
// => string[]
```
Atenção no `InferArrayType`, um tipo que recebe um genérico `A`, valida se este tipo é um array e, caso seja, retorna o tipo do elemento do array. Note que o tipo `U` é inferido dinamicamente utilizando a *keyword* `infer`.
Esse é um exemplo simples, mas que demonstra a potência do `infer` em situações mais complexas.
Agora, vamos ver um exemplo mais complexo, onde utilizamos `infer` para converter um objeto de duas propriedades em uma tupla:
```typescript
type ObjectToTuple<T> = T extends { a: infer A; b: infer B } ? [A, B] : never;
type Result = ObjectToTuple<{a: string; b: number}>;
// => [string, number]
```
No exemplo acima, `ObjectToTuple` é um tipo que recebe um genérico `T`, valida se `T` é um objeto com as propriedades `a` e `b`, e retorna um array com os tipos das propriedades `a` e `b`. Note que `A` e `B` são inferidos dinamicamente utilizando a *keyword* `infer`.
### Inferindo parâmetros ou retorno de funções
A versatilidade do `infer` vai além da inferência de tipos simples, também sendo possível inferir tipos de funções. No exemplo abaixo, iremos inferir o tipo do parâmetro de uma função de aridade 1 e o tipo de retorno da função.
```typescript
type FunctionArg<F> = F extends (p: infer P) => unknown ? P : never;
type R1 = FunctionArg<(x: number) => boolean>;
// => number
type R2 = FunctionArg<(x: number, y: number) => boolean>;
// => never
```
Neste exemplo, a função `FunctionArg` recebe um tipo genérico `F` e verifica se `F` é uma função de aridade 1. Caso seja, o tipo do parâmetro é inferido e retornado. Caso a aridade seja maior que 1, o tipo `never` é retornado.
Mas e se quisermos inferir os tipos de uma função com aridade maior que 1? Podemos fazer isso com a seguinte implementação:
```typescript
type FunctionArg<F> = F extends (...args: infer P) => unknown ? P : never;
type R1 = FunctionArg<(x: number) => boolean>;
// => [number]
type R2 = FunctionArg<(x: number, y: number) => boolean>;
// => [number, number]
```
Neste caso, a função `FunctionArg` recebe um tipo genérico `F` e verifica se `F` é uma função de aridade `n`. Caso seja, o tipo dos parâmetros é inferido e retornado em um array.
Para inferir o tipo de retorno de uma função, podemos fazer o seguinte:
```typescript
type FunctionReturn<F> = F extends (...args: any[]) => infer R ? R : never;
type R1 = FunctionReturn<(x: number) => boolean>;
// => boolean
type R2 = FunctionReturn<(x: number, y: number) => boolean>;
// => boolean
```
Neste caso, a função `FunctionReturn` recebe um tipo genérico `F` e verifica se `F` é uma função de aridade `n`. Caso seja, o tipo de retorno é inferido e retornado.
## Importante
- Apesar de ser uma ferramenta poderosa, tipos condicionais podem ser complexos e difíceis de entender, especialmente quando combinados com `infer`.
- É de extrema importância avaliar as necessidades de cada caso para decidir se é ou não necessário.
- Tipos condicionais mal escritos podem piorar a experiência de desenvolvimento e tornar o código mais difícil de entender. Use com moderação e sempre busque a simplicidade.
## Conclusão
Tipos condicionais são uma ferramenta poderosa para criar tipos não uniformes e mais robustos. A *keyword* `infer` é uma ferramenta essencial para inferir tipos dinâmicos dentro de condições. Combinando essas duas ferramentas, podemos criar tipos complexos e expressivos que cobrem uma grande variedade de cenários e que aumentam a segurança e a robustez do nosso código. | iagobelo |
1,876,056 | Cent's Two Cents - Reading | Hi everyone, Cent here with my second day of updates! Continuing with the Odin Project, today was... | 27,574 | 2024-06-04T02:39:28 | https://dev.to/centanomics/cents-two-cents-reading-4o43 | Hi everyone,
Cent here with my second day of updates!
Continuing with the Odin Project, today was mostly about setting up and a few basics about the internet that I realized I never actually learned in school. Basically just how the internet works. I knew a lot of the terms but just never how they interacted with each other specifically.
In any case, I have everything setup and ready to start learning. While I do know a lot of this stuff already , I want to go over the material again to strengthen my knowledge.
This post is relatively short as I just did a lot of reading today, tomorrow maybe I'll share a code snippet or two as I actually get into the exercises.
Until tomorrow! | centanomics | |
1,876,055 | Implement React v18 from Scratch Using WASM and Rust - [15] Implement useEffect | Based on big-react，I am going to implement React v18 core features from scratch using WASM and... | 27,011 | 2024-06-04T02:38:26 | https://dev.to/paradeto/implement-react-v18-from-scratch-using-wasm-and-rust-15-implement-useeffect-5gb4 | react, webassembly, rust |
> Based on [big-react](https://github.com/BetaSu/big-react)，I am going to implement React v18 core features from scratch using WASM and Rust.
>
> Code Repository：https://github.com/ParadeTo/big-react-wasm
>
> The tag related to this article：[v15](https://github.com/ParadeTo/big-react-wasm/tree/v15)
The details of this update can be seen [here](https://github.com/ParadeTo/big-react-wasm/pull/14/files). Let's go through the entire process below.
Like `useState`, we first need to export this method from the `react` package. It takes two parameters:
```rust
#[wasm_bindgen(js_name = useEffect)]
pub unsafe fn use_effect(create: &JsValue, deps: &JsValue) {
let use_effect = &CURRENT_DISPATCHER.current.as_ref().unwrap().use_effect;
use_effect.call2(&JsValue::null(), create, deps);
}
```
Next, we need to implement `mount_effect` and `update_effect` for the initial render and updates, respectively. `mount_effect` adds a new `Hook` node to the linked list of Hooks on the `FiberNode`, with its `memoized_state` property pointing to an `Effect` object. This object is also added to the `update_queue` on the `FiberNode`, which is a circular queue. Additionally, the `FiberNode` is marked with `PassiveEffect`:
The work of `update_effect` is similar to `mount_effect`, updating the `Effect` node, but it performs a shallow comparison of the incoming `deps` with the previous `prev_deps`. If they are all the same, it will not mark the `FiberNode` with `PassiveEffect`.
The properties included in `Effect` are as follows:
```rust
pub struct Effect {
pub tag: Flags,
pub create: Function,
pub destroy: JsValue,
pub deps: JsValue,
pub next: Option<Rc<RefCell<Effect>>>,
}
```
During the Render phase, no changes are needed. In the Commit phase, we need to add logic to handle `useEffect` before `commit_mutation_effects`:
```rust
// useEffect
let root_cloned = root.clone();
let passive_mask = get_passive_mask();
if flags.clone() & passive_mask.clone() != Flags::NoFlags
|| subtree_flags.clone() & passive_mask != Flags::NoFlags
{
if unsafe { !ROOT_DOES_HAVE_PASSIVE_EFFECTS } {
unsafe { ROOT_DOES_HAVE_PASSIVE_EFFECTS = true }
let closure = Closure::wrap(Box::new(move || {
flush_passive_effects(root_cloned.borrow().pending_passive_effects.clone());
}) as Box<dyn Fn()>);
let function = closure.as_ref().unchecked_ref::<Function>().clone();
closure.forget();
unstable_schedule_callback_no_delay(Priority::NormalPriority, function);
}
}
```
Here, we use the `scheduler` implemented in the previous article to schedule a task to execute the `flush_passive_effects` method:
```rust
fn flush_passive_effects(pending_passive_effects: Rc<RefCell<PendingPassiveEffects>>) {
unsafe {
if EXECUTION_CONTEXT
.contains(ExecutionContext::RenderContext | ExecutionContext::CommitContext)
{
log!("Cannot execute useEffect callback in React work loop")
}
for effect in &pending_passive_effects.borrow().unmount {
CommitWork::commit_hook_effect_list_destroy(Flags::Passive, effect.clone());
}
pending_passive_effects.borrow_mut().unmount = vec![];
for effect in &pending_passive_effects.borrow().update {
CommitWork::commit_hook_effect_list_unmount(
Flags::Passive | Flags::HookHasEffect,
effect.clone(),
);
}
for effect in &pending_passive_effects.borrow().update {
CommitWork::commit_hook_effect_list_mount(
Flags::Passive | Flags::HookHasEffect,
effect.clone(),
);
}
pending_passive_effects.borrow_mut().update = vec![];
}
}
```
The `pending_passive_effects` here is a property on the `FiberRootNode`, used to store the `Effect` that needs to be executed this time:
```rust
pub struct PendingPassiveEffects {
pub unmount: Vec<Rc<RefCell<Effect>>>,
pub update: Vec<Rc<RefCell<Effect>>>,
}
```
Among them, the `Effect` that needs to be handled due to component unmounting is saved in `unmount`, and the `Effect` that needs to be handled due to updates is saved in `update`. From the code, we can see that the `Effect` due to component unmounting is handled first, even if the component is later in the sequence, like in this example:
```js
function App() {
const [num, updateNum] = useState(0)
return (
<ul
onClick={(e) => {
updateNum((num: number) => num + 1)
}}>
<Child1 num={num} />
{num === 1 ? null : <Child2 num={num} />}
</ul>
)
}
function Child1({num}: {num: number}) {
useEffect(() => {
console.log('child1 create')
return () => {
console.log('child1 destroy')
}
}, [num])
return <div>child1 {num}</div>
}
function Child2({num}: {num: number}) {
useEffect(() => {
console.log('child2 create')
return () => {
console.log('child2 destroy')
}
}, [num])
return <div>child2 {num}</div>
}
```
After clicking, the `destroy` of `Child2`'s `useEffect` will be executed first, printing `child2 destroy`. But if it's changed to this:
```js
function App() {
const [num, updateNum] = useState(0)
return (
<ul
onClick={(e) => {
updateNum((num: number) => num + 1)
}}>
<Child1 num={num} />
<Child2 num={num} />
</ul>
)
}
```
After clicking, the `destroy` of `Child1`'s `useEffect` will be executed first, printing `child1 destroy`.
So when are the `Effect` in `pending_passive_effects` added? The answer is in `commit_mutation_effects`, there are two situations:
1. If the `FiberNode` node is marked for deletion and is of the `FunctionComponent` type, then the `Effect` in the `update_queue` needs to be added to the `unmount` list in `pending_passive_effects`.
```rust
fn commit_deletion(
&self,
child_to_delete: Rc<RefCell<FiberNode>>,
root: Rc<RefCell<FiberRootNode>>,
) {
let first_host_fiber: Rc<RefCell<Option<Rc<RefCell<FiberNode>>>>> =
Rc::new(RefCell::new(None));
self.commit_nested_unmounts(child_to_delete.clone(), |unmount_fiber| {
let cloned = first_host_fiber.clone();
match unmount_fiber.borrow().tag {
WorkTag::FunctionComponent => {
CommitWork::commit_passive_effect(
unmount_fiber.clone(),
root.clone(),
"unmount",
);
}
...
}
}
}
```
2. If the `FiberNode` node is marked with `PassiveEffect`, then the `Effect` in the `update_queue` needs to be added to the `update` list in `pending_passive_effects`.
```rust
if flags & Flags::PassiveEffect != Flags::NoFlags {
CommitWork::commit_passive_effect(finished_work.clone(), root, "update");
finished_work.borrow_mut().flags -= Flags::PassiveEffect;
}
```
The general process is now complete, for more details please refer to [here](https://github.com/ParadeTo/big-react-wasm/pull/14/files).
| paradeto |
1,876,054 | SQL Databases for free on Cloud | There are many database providers out there but not all of them have free tier and even if they do... | 0 | 2024-06-04T02:36:20 | https://dev.to/kaushal01/free-database-hosting-providers-3lpo | webdev, javascript, programming, database | There are many database providers out there but not all of them have free tier and even if they do sometimes its nothing useful. So less talking here is 5 free database hosting provider. I will just give the links here you can explore them on your own time to save u time reading this post
- [Render](https://render.com/pricing)
- [TiDB or (PingCap)](https://www.pingcap.com/pricing/)
- [Turso](https://turso.tech/pricing)
- [Xata](https://xata.io/pricing)
- [Cockroach Labs](https://www.cockroachlabs.com/pricing/)
Thank you all and please share if you know any providers that are not very known or new
| kaushal01 |
1,872,712 | Sink - A short link system based on Cloudflare with visit statistics | I previously shared some websites on Twitter using short links to make it easier to see if people are... | 0 | 2024-07-06T11:58:21 | https://chi.miantiao.me/posts/sink/ | cloudflare, worker, opensource | ---
title: Sink - A short link system based on Cloudflare with visit statistics
published: true
date: 2024-06-04 02:33:44 UTC
tags: cloudflare, worker, opensource
canonical_url: https://chi.miantiao.me/posts/sink/
---
I previously shared some websites on [Twitter](https://x.com/xkaibi) using short links to make it easier to see if people are interested. Among these link shortening systems, Dub provides the best user experience, but it has a fatal flaw: once the monthly clicks exceed 1000, you can no longer view the statistics.
While surfing the internet at home during the Qingming Festival, I discovered that [Cloudflare Workers Analytics Engine](https://developers.cloudflare.com/analytics/analytics-engine/) supports data writing and API data querying. So, I created an MVP version myself, capable of handling statistics for up to 3,000,000 visits per month. Cloudflare's backend likely uses Clickhouse, so performance shouldn't be a significant issue.
During the Labor Day holiday, I improved the frontend UI at home and used it for about half a month, finding it satisfactory. I have open-sourced it for everyone to use.
## Features
- Link shortening
- Visit statistics
- Serverless deployment
- Custom Slug
- 🪄 AI-generated Slug
- Link expiration
## Demo
[Sink.Cool](https://sink.cool/dashboard)
Site Token: `SinkCool`
### Site-wide Analysis
<details>
<summary><b>Link Management</b></summary>
<img alt="Link Management" src="https://static.miantiao.me/share/uQVX7Q/sink.cool_dashboard_links.png"/>
</details>
<details>
<summary><b>Individual Link Analysis</b></summary>
<img alt="Individual Link Analysis" src="https://static.miantiao.me/share/WfyCXT/sink.cool_dashboard_link_slug=0.png"/>
</details>
## Open Source
[](https://github.com/ccbikai/sink)
## Roadmap (WIP)
- Browser extension
- Raycast extension
- Apple Shortcuts
- Enhanced link management (based on Cloudflare D1)
- Enhanced analysis (support filtering)
- Panel performance optimization (support infinite loading)
- Support for other platforms (maybe)
---
Finally, feel free to follow me on [Twitter](https://x.com/xkaibi) for updates on development progress and to share some web development news. | ccbikai |
1,876,052 | Social engineering | Social engineering is the art of manipulating people so they give up confidential information. Every... | 0 | 2024-06-04T02:33:35 | https://blog.logto.io/social-engineering/ | webdev, security, cybersecurity, opensource | Social engineering is the art of manipulating people so they give up confidential information. Every cyber crime starts with a social engineering attack. Let's have a look at how it works and how to protect yourself from it.
---
# Introduction
When it come to cyber security, most people think of technical attacks such as SQL injection, cross-site scripting, man-in-the-middle attacks, or malware. However, the most common and effective attacks are often not technical at all. Social engineering is the art of manipulating people so they give up confidential information. Every cyber crime starts with a social engineering attack.
Here is the definition from [Wikipedia](https://en.wikipedia.org/wiki/Social_engineering_(security)):
> In the context of information security, social engineering is the psychological manipulation of people into performing actions or divulging confidential information. A type of confidence trick for the purpose of information gathering, fraud, or system access, it differs from a traditional "con" in that it is often one of many steps in a more complex fraud scheme.[1] It has also been defined as "any act that influences a person to take an action that may or may not be in their best interests."
The types of information these criminals are seeking may vary, but when individuals are targeted, the criminals are usually trying to trick you into giving them your passwords, personal information, or access your computer to secretly install malicious software–that will give them access to your passwords and bank information as well as giving them control over your computer.
# How does social engineering work?
Social engineering attacks happen in one or more steps. Most social engineering attacks rely on actual communication between attackers and victims. It is often the case that victims are targeted by multiple attackers over an extended period of time, and attacks are carefully crafted to avoid detection. A successful attack involves the following steps:
1. **Research**: The attacker gathers information about the target, such as potential points of entry and weak security protocols, needed to carry out the attack. In todays world, it is very easy to find information about a person online. For example, you can find a person's email address, phone number, and even their home address on their social media profile. You can also find out where they work, what they do, and who they work with. This information can be used to craft a very convincing phishing email or phone call on the next step.
2. **Hook**: The attacker uses that information to create a believable scenario to lure the victim into doing what the attacker wants. For example, the attacker may call the victim and pose as a customer service agent from their bank, asking them to verify their account information. Or, they might call an employee at a company and pose as an IT support person, asking them to reset their password.
3. **Play on emotions**: The attacker plays on emotions to get the victim to act immediately, without thinking. For example, the attacker might threaten the victim with fines, penalties, or prosecution if they don't comply with the request right away. Or, they might appeal to the victim's greed, promising them a large sum of money or reward in exchange for their help.
4. **Execute**: The attacker executes the attack, which can take any number of forms. For example, they might:
- Trick the victim into installing malware on their computer.
- Trick the victim into revealing sensitive information in an email or over the phone.
- Trick the victim into sending money to the attacker.
- Trick the victim into clicking on a malicious link in an email or text message.
This above steps may happen in a very short period of time, or they may happen over the course of weeks or months. The attacker may target one person, or they may target a group of people. The connection may be established through a phone call, email, text message, or social media chats. But it ultimately concludes with an action you take, like sharing your information or exposing yourself to malware.
# Types of social engineering attacks
There are many types of social engineering attacks, and each has its own purpose and goal. Here are some of the most common types of social engineering attacks:
## Spam Phishing
Spam phishing is the most common type of social engineering attack. It is a type of phishing attack where the attacker sends out millions of emails to random people, hoping that some of them will fall for the scam. The emails are usually sent from a fake email address, and they often contain a link to a malicious website or a malicious attachment. The goal of the attack is to trick the victim into clicking on the link or opening the attachment, which will install malware on their computer.
### Example
Imagine you receive an unsolicited email in your inbox with an enticing subject line that claims you've won a substantial cash prize. The email's title states that you've won $1,000,000 and need to claim your prize immediately.
Upon opening the email, you find a message congratulating you on your supposed lottery win. It may include extravagant promises, such as a life-changing amount of money. The email typically contains a link or contact information for you to claim your winnings.
This email exhibits classic signs of a spam phishing attack:
1. **Unsolicited**: You never participated in any lottery or contest, so you shouldn't have won any prize.
2. **Too Good to Be True**: The promise of a large sum of money for no apparent reason is a common tactic used to lure victims.
3. **Urgent Action**: The email may claim that you must act quickly to claim your prize, creating a sense of urgency.
4. **Requests for Personal Information or Money**: To "claim" your prize, you may be asked to provide personal information, pay fees, or transfer money to cover alleged processing costs.
## Spear Phishing
Spear phishing is a type of phishing attack where the attacker targets a specific person or group of people. The attacker will do research on the target, and then send them a personalized email that looks like it came from a trusted source. The email will usually contain a link to a malicious website or a malicious attachment. The goal of the attack is to trick the victim into clicking on the link or opening the attachment, which will install malware on their computer. Unlike spam phishing, spear phishing attacks are highly targeted and personalized, and they are much more likely to succeed.
### Example
In this spear phishing scenario, you receive an email that appears to be from a colleague or someone you know. The email contains a subject line that suggests it's an important security notice. What makes spear phishing different from regular phishing is that the attacker targets a specific individual and often possesses some knowledge about the target.
Upon opening the email, you find a message that claims to be from your IT advisor, Charles. It addresses you by your full name and mentions an alleged security breach on your work account. The email requests that you click on a link or download an attachment to secure your account. You click on the link, and it takes you to a website that looks exactly like your company's login page. You enter your username and password, and the attacker now has access to your account.
This email exhibits classic signs of a spear phishing attack:
1. **Personalization**: The email addresses you by your full name, giving it an appearance of legitimacy.
2. **Urgency**: The message conveys a sense of urgency, implying that you need to take immediate action to address a security issue.
3. **Requests for Action**: The email asks you to click on a link or download an attachment. These links or attachments often contain malware or phishing sites.
## Baiting
Baiting is a type of social engineering attack where the attacker offers something enticing to the victim in exchange for their personal information. For example, the attacker might offer a free gift card or a free movie download in exchange for the victim's email address. The goal of the attack is to trick the victim into giving up their personal information, which the attacker can then use to steal their identity or commit fraud. It takes advantage of the curiosity or greed of the victim.
### Example
In this baiting scenario, the attackers leave a USB drive in a public place, such as a coffee shop or a parking lot. The USB drive is labeled "Confidential" or "Private", and it contains a malicious program that will install malware on the victim's computer when they plug it in. The goal of the attack is to trick the victim into plugging the USB drive into their computer, which will install malware on their computer.
You plug the USB drive into your computer, hoping to find valuable information. It appears to contain a file named "Confidential_Project_Data.csv." As you try to open the file, it triggers a hidden script that infects your computer with malware.
In this baiting attack:
1. The **bait** is the USB drive, which is labeled "Confidential" or "Private" making it enticing for anyone who comes across it, especially in a professional or workplace setting.
2. **Curiosity Factor**: Human curiosity is leveraged as a vulnerability, prompting individuals to take actions they might otherwise avoid.
## Water holing
Water holing is a type of social engineering attack where the attacker targets a specific group of people by infecting a website that they are likely to visit. For example, the attacker might infect a popular news website or a popular social media site. The goal of the attack is to trick the victim into visiting the infected website, which will install malware on their computer.
### Example
A group of attackers aims to compromise the security of a specific industry association that represents a community of cybersecurity professionals. The attackers intend to steal sensitive data and infiltrate the systems of cybersecurity experts.
The attackers identify a well-known and respected website used by this community. In this case, they choose the official website of the cybersecurity industry association.The attackers identify and exploit a vulnerability on the industry association's website. They may use tech methods like SQL injection or cross-site scripting (XSS) to gain unauthorized access to the site's content management system. Once they gain access to the website, the attackers inject malicious code into the site's pages. This code is designed to deliver malware to visitors of the compromised pages.
Then the attackers wait for cybersecurity professionals to visit the website. They know that many cybersecurity experts regularly check the site for updates, news, and resources.
As cybersecurity professionals visit the industry association's website to read articles, attend webinars, or download resources, they unknowingly expose their devices to the injected malware. The malware may steal sensitive information, such as login credentials or personal data. It can also provide the attackers with a foothold to launch further attacks, including spear phishing or exploiting known vulnerabilities on the victims' systems.
In this water holing attack:
1. The **watering hole** is the industry association's website, which is a popular destination for cybersecurity professionals.
2. **Targeted Audience**: The attackers target a specific group of people, in this case, cybersecurity professionals.
3. **Exploiting Trust**: The attackers exploit the trust that cybersecurity professionals have in the industry association's website.
4. **Exploiting Vulnerabilities**: The attackers exploit vulnerabilities in the website's content management system to inject malicious code into the site's pages.
# How to protect yourself from social engineering attacks
Protecting yourself from social engineering attacks requires a combination of awareness, skepticism, and best practices. Here are some essential steps to safeguard yourself against social engineering attacks:
1. Educate Yourself: Learn about common social engineering tactics, including phishing, pretexting, baiting, and tailgating. Stay informed about the latest social engineering techniques and trends.
2. Verify the Identity: Always verify the identity of individuals or organizations that request your personal or sensitive information. Don't rely solely on phone numbers, emails, or websites provided by the person contacting you. Use official contact information obtained independently from reliable sources.
3. Question Requests: Be skeptical of unsolicited requests for personal, financial, or confidential information. Legitimate organizations typically don't request such information via email or phone. If someone asks for sensitive information, ask why it's needed and how it will be used.
4. Beware of Urgency and Pressure: Social engineers often create a sense of urgency to rush you into making decisions without thinking. Take your time to consider requests or offers. Verify the legitimacy of the situation.
5. Secure Physical Access: Protect your physical workspace from unauthorized access. Lock your computer and devices when not in use. Be cautious when allowing unfamiliar individuals into secure areas.
6. Employee Training: If you're part of an organization, provide social engineering awareness training for employees. Teach employees to recognize and report suspicious activities.
7. Use Reliable Sources: Get information from trustworthy and verified sources. Avoid relying on unofficial websites or unverified news.
8. Data Encryption: Encrypt sensitive data, both at rest and during transmission, to protect it from unauthorized access.
## Practice Secure Online Behavior
For developers and business owners. If you are developing a web application, you should follow the best practices to protect your users from social engineering attacks. There are may ways to enable extra security for your application:
1. **Use strong passwords.** Most people use weak passwords that are easy to guess based on their personal information.To implement a secure and trustworthy user identity management system, you should enable strong password policies. This will prevent users from using their weak passwords without proper security measures in place.
2. **Enable multi-factor authentication.** Multi-factor authentication (MFA) adds an extra layer of security to users' account by requiring them to enter a code from their phone or another device in addition to the passwords. This makes it much harder for attackers to gain access to your clients' account. Even if your clients' passwords are compromised, the attackers won't be able to access their accounts without the second factor.
3. **Encrypt users data.** Encrypting users' data is a good way to protect it from unauthorized access. If an attacker gains access to your database, they won't be able to read the data without the encryption key. This will prevent them from stealing your clients' personal information.
4. **Frequently rotate the access keys.** Access keys are used to access your application's resources. If an attacker gains access to your access keys, they will be able to access your application's resources without your permission. To prevent this, you should frequently rotate the access keys.
5. **Use modern authentication systems.** Modern authentication protocols like OAuth 2.0 and OpenID Connect are much more secure than older protocols like SAML and WS-Federation. They use modern cryptographic algorithms and are much harder to attack.
6. **Pre-register the sign-in redirect urls and devices.** If you are using OAuth 2.0 or OpenID Connect for authentication, you should pre-register the sign-in redirect urls and devices. This will prevent attackers from using your clients' accounts to sign in to your application from their own devices.
{% cta https://logto.io/?ref=dev %} Try Logto Cloud for free {% endcta %} | palomino |
1,876,051 | ab | b_c_ | 0 | 2024-06-04T02:32:51 | https://dev.to/longdt22/a-4eoe | b_c_ | longdt22 | |
1,876,049 | How to write a trading strategy on FMZ Quant platform | Summary After studying the previous sections, we finally ready to write a quantitative... | 0 | 2024-06-04T02:25:19 | https://dev.to/fmzquant/how-to-write-a-trading-strategy-on-fmz-quant-platform-31im | trading, strategy, fmzquant, cryptocurrency | ## Summary
After studying the previous sections, we finally ready to write a quantitative trading strategy. This will be the most important step in your entry into the quantitative trading from manual trading. In fact, it is not so mysterious. Writing a strategy is nothing more than realizing your ideas with code. This section will implement a quantitative trading strategy from scratch, after the study, everyone will familiar with how to write strategies on the FMZ Quant system.
## Ready
First, open the official website of the FMZ Quant, log in your account. click on "Dashboard--strategy--Add Strategy". please note that before starting to write the code, you need to select the types of programming language. in this section we will use JavaScript. select it from the drop-down menu. in addition, FMZ Quant platform also Support for Python, C++, and visual programming.
## Strategy idea
In the previous chapter, I introduced a moving average strategy. That is: if the price is higher than the average price of the last 10 days, open long position. if the price is lower than the average price of the last 10 days, short it. However, although the price can directly reflect the market status, there still will be many false breakthrough signals; therefore, we must upgrade and improve this strategy.
First, choose a larger period moving average to judge the trend direction. At least half of the false breakthrough signals have been filtered. The large cycle moving average is slow, but it will be more stable. Then, in order to increase the success rate of the opening position, we add another condition. This large cycle moving average is at least upward; finally, the relative positional relationship between price, short-term moving average and long-term moving average is used to form a complete trading strategy.
## Strategy Logic
With the above strategy ideas, we can try to build this strategy logic. The logic here is not to let you calculate the law of celestial movement, it is not that complicated. It is nothing more than expressing the previous strategy ideas in words.
- Open long position: If there is currently no position, and the closing price is greater than the short-term moving average, and the closing price is greater than the long-term moving average, and the short-term moving average is greater than the long-term moving average, and the long-term moving average is rising.
- Open short position: If there is currently no position, and the closing price is less than the short-term moving average, and the closing price is less than the long-term moving average, and the short-term moving average is less than the long-term moving average, and the long-term moving average is falling.
- Close Long position: If currently hold long position, and the closing price is less than the long-term moving average, or the short-term moving average is less than the long-term moving average, or the long-term moving average is falling.
- Close Short position: If current hold short position, and the closing price is greater than the long-term moving average, or the short-term moving average is greater than the long-term moving average, or the long-term moving average is rising.
The above is the logic of the entire strategy, if we convert the text version of this strategy into code, it will include: the acquisition of the market quote, the calculation of indicators, placing order to open and close position, these three steps.
## MyLanguage Strategy
The first thing is to get the market quote. In this strategy, we only need to get the closing price. In the M language, the API to get the closing price is: CLOSE, which means you only need to write CLOSE in the coding area to obtain the latest K line closing price.
Next thing is to calculate indicator. In this strategy, we will use two indicators, namely: short-term moving average and long-term moving average. We assume that the short-term moving average is the 10-period moving average and the long-term moving average is the 50-period moving average. How to use code to represent these two? Please see below:
```
MA10:=MA(CLOSE,10); // Get the 10-cycle moving average of the latest K-line and save the result in variable MA10
MA50:=MA(CLOSE,50); // Get the 50-cycle moving average of the latest K-line and save the result in variable MA50
```
In manual trading, we can see at a glance whether the 50-period moving average is rising or falling, but how do we express it in code? Think carefully, judging whether the moving average is rising or not, is the current moving average of the K-line is larger than the moving average of the previous K-line? or is it hight than two previous K-line? If the answer is yes, then we can say that the moving average is rasing. We also can judge the falling by the same method.
```
MA10:=MA(CLOSE,10); //Get the 10-cycle moving average of the latest K line and save the result to variable MA10
MA50:=MA(CLOSE,50); //Get the 50-cycle moving average of the latest K line and save the result to variable MA10
MA10_1:=REF(MA10,1); //Get the 10-cycle moving average of the pervious K line and save the result to variable MA10_1
MA50_1:=REF(MA50,1); //Get the 50-cycle moving average of the pervious K line and save the result to variable MA50_1
MA10_2:=REF(MA10,2); //Get the 10-cycle moving average of the latest K line and save the result to variable MA10_2
MA50_2:=REF(MA50,2); //Get the 50-cycle moving average of the latest K line and save the result to variable MA50_2
MA50_ISUP:=MA50>MA50_1 AND MA50_1>MA50_2; //Determine whether the current 50-line moving average of the K line is rising
MA50_ISDOWN:=MA50<MA50_1 AND MA50_1<MA50_2; //Determine whether the current 50-line moving average of the K line is falling
```
Note that on lines 8 and 9 of the above code, the word "AND", is a Logical Operators. which means when the both side of "and" condition are true, the whole sentence is true, otherwise it is false.(if only one side of condition is true, as a whole, it is still false). Translate it in to English: If the 50-period moving average of the current K-line is greater than the 50-period moving average of the previous K-line, and the 50-period moving average of the pervious K-line is greater than the K line before it 50-period moving average K-line, then Calculate the value as "yes"; otherwise, calculate the value as "no" and assign the result to "MA50_ISUP".
The final step is to place orders, you only need to call the FMZ Quant's order API to execute the buy and sell operation after the logic code. Please see below:
```
MA10:=MA(CLOSE,10); //Get the 10-cycle moving average of the latest K line and save the result to variable MA10
MA50:=MA(CLOSE,50); //Get the 50-cycle moving average of the latest K line and save the result to variable MA10
MA10_1:=REF(MA10,1); //Get the 10-cycle moving average of the pervious K line and save the result to variable MA10_1
MA50_1:=REF(MA50,1); //Get the 50-cycle moving average of the pervious K line and save the result to variable MA50_1
MA10_2:=REF(MA10,2); //Get the 10-cycle moving average of the latest K line and save the result to variable MA10_2
MA50_2:=REF(MA50,2); //Get the 50-cycle moving average of the latest K line and save the result to variable MA50_2
MA50_ISUP:=MA50>MA50_1 AND MA50_1>MA50_2; //Determine whether the current 50-line moving average of the K line is rising
MA50_ISDOWN:=MA50<MA50_1 AND MA50_1<MA50_2; //Determine whether the current 50-line moving average of the K line is falling
CLOSE>MA10 AND CLOSE>MA50 AND MA10>MA50 AND MA50_ISUP,BK; //open long position
CLOSE<MA10 AND CLOSE<MA50 AND MA10<MA50 AND MA50_ISUP,SK; //open short position
CLOSE<MA50 OR MA10<MA50,SP;//close long position
CLOSE>MA50 OR MA10>MA50,BP;//close short position
```
Note that line 13 and 14 of the above, the word "OR", which is another logical operator, in the M language means "or", translate it into English : if the current K line's closing price is less than the current K line's 50-period moving average, or the current K-line 10-period moving average is less than the current K-line 50-period moving average, the value is calculated as "Yes". And place the order immediately; otherwise the calculation is "no" and do nothing.
Please note that "AND" and "OR" are all logical operators in the M language:
- "AND" is when all conditions are "yes", and the final condition is "yes";
- "OR" is when as long as any one of the conditions is "yes", the final condition is "yes".
## To sum up
The above is the entire process of writing a trading strategy on the FMZ Quant platform by using M programming language. There are three steps in total: from having a strategy idea, to strategy thinking and using text to describe the logic, and finally implementing a complete trading strategy with code. Although this is a simple strategy, the specific implementation process is similar to the complex strategy, except that the strategy and data structure of the strategy are different. Therefore, as long as you understand the quantitative strategy process in this section, you can conduct quantitative strategy research and practice on the FMZ Quant platform.
## After-school exercises
1. Try to implement the strategies in this section on your own.
2. On the basis of the strategy of this section, add the stop-loss and take-profit function.
## Next section notice
In the development of quantitative trading strategies, programming languages are like weapons, a good programming language can help you get twice the result with half the effort. For example , there are more than a dozen of the most commonly used Python, C++, Java, C#, EasyLanguage, and M language in the quantitative trading world . Which weapon should you choose to battle on the battlefield? In the next section we will introduce these common programming languages, as well as the characteristics of each programming language itself.
From: https://blog.mathquant.com/2019/04/17/2-4-how-to-write-a-trading-strategy-on-fmz-quant-platform.html | fmzquant |
1,876,048 | Creating a Linux Virtual Machine with Ubuntu Server using Password Authentication. | In the portal, search for Virtual Machine Select Create Select Azure Virtual machine Select... | 0 | 2024-06-04T02:23:31 | https://dev.to/opsyog/creating-a-linux-virtual-machine-with-ubuntu-server-using-password-authentication-2nec | linux, azure, vm | In the portal, search for Virtual Machine
Select Create
Select Azure Virtual machine
Select Resource Group
Enter Virtual machine name
Select image as Ubuntu Server
Select Adminstration Type to be Password
Enter Username and password
Select Allow selected ports for Public inbound ports
Select inbound ports
Go to Monitoring Tab
Disable Diagnostics
Go to Tag tab and add a name and value
Select Review + Create, confirm validation and select create
Go to Resource and select IP address
Increase the timeout to your preferred time and save your changes
Open PowerShell on your local computer
Enter "ssh, your username and your VM IP address" and click Enter
It will ask if you want to continue, type "yes"
Type your password - Note, Linux will not display your password as you type it.
Then you will get connected to your Virtual machine.
| opsyog |
1,876,047 | What's New in ADC 0.8 & 0.9 & 0.10? | Introduction ADC (APISIX Declarative CLI) is a declarative configuration tool introduced... | 0 | 2024-06-04T02:23:02 | https://api7.ai/blog/adc-0.8-0.9-0.10 | ## Introduction
[ADC (APISIX Declarative CLI)](https://github.com/api7/adc) is a declarative configuration tool introduced by [API7.ai](https://api7.ai/), providing a convenient toolset for users to implement GitOps. Users can easily integrate it into their CI/CD pipelines to manage the full API lifecycle, completing API upgrades and releases. After the release of [0.7 version, ADC released three new versions: 0.8, 0.9, and 0.10, with optimizations and updates in terms of functionality, performance, and user experience.
## New Features of ADC
### Improvements to Resource Change Detector: Differ
> These modifications were introduced in versions 0.8 and 0.9.
We have introduced a new version of the resource change detector Differ, v3, which has significant improvements in functionality and code quality.
1. The new Differ introduces a default value merging mechanism for local resources, ensuring that the default values of the server side do not interfere with ADC's resource change checks.
When the client sends a request to create a resource on the API7 or APISIX Admin API, the server performs Schema validation on the submitted request. During this process, some fields that have default values marked in the Schema but are not sent by the client will be automatically added to the submitted resource. As a result, when we read the resource from the API again, it will be different from the initial submission.
Previous ADC versions would list these resources as "modified" and send update API requests to the Admin API. This behavior introduced some uncertainty for ADC, and this problem has been resolved through Differ.
2. The default value merging mechanism has been implemented in the API7 backend, ensuring that resource differences are only considered as modifications when the user has changed the local YAML configuration.
2. Refined Differ detection granularity: ADC currently performs resource change checks separately at the resource body and plugin dimensions, helping to reduce anomalies in the check.
3. Optimized code quality, simplified redundant code to improve readability, and fixed some bugs.
### Resource Filters
We have added two resource filtering mechanisms based on resource labels and resource types. They can be used to exclude unnecessary resources during the fetch, difference check, and synchronization operations.
#### Resource Label Filter
> The feature was introduced in version 0.8.
This filter performs filtering based on the labels field of the resources. Users can enable the filter by using the `--label-selector key=value` parameter on the command line. It supports configuring multiple filter conditions, and only remote resources that simultaneously meet these rules will be considered as existing, while local resources will be automatically added with these labels.
This ensures that we perform resource checks and synchronization within a small scope, helping to split the tasks executed in the CI/CD pipeline and prevent accidental synchronization from damaging resources that do not need to be modified.
#### Resource Type Filter
> The feature was introduced in version 0.9.
We added two new command-line parameters: `--include-resource-type <type>` and `--exclude-resource-type <type>`, which can be configured multiple times, but the include and exclude parameters are mutually exclusive.
With these two parameters, we can filter out specific resource types from the current operation. For example, using `include-resource-type` can be used to set a whitelist and select the resource types to be included in the operation; while `exclude-resource-type` will determine the resource types to be excluded from the operation.
This helps us better handle resources that do not need to be frequently changed, such as plugin metadata and global rules of plugins.
### Command Line Improvements
> These improvements were introduced in version 0.9.
#### TLS Certificate Configuration
We have added a series of TLS-related parameters to the command line, such as:
- `--ca-cert-file` to specify the server's CA certificate file
- `--tls-skip-verify` to disable TLS server certificate verification
- `--tls-client-cert-file` and `--tls-client-key-file` to specify the mTLS client certificate files
These parameters help ADC establish a secure encrypted connection and prevent man-in-the-middle attacks.
#### Timeout Control
We have added the `--timeout <duration>` parameter to control the timeout duration of API calls, supporting syntax like `1m30s`. When an Admin API call takes too long or gets stuck, the timeout mechanism will take effect to prevent it from waiting indefinitely.
### Debug Mode
> This feature was introduced in version 0.9.
When ADC performs resource operations internally, it needs to call a large number of APIs. Sometimes we may need to check these API calls to analyze whether they are being sent correctly or to verify that the server's responses meet expectations. While packet capture can be used to achieve this, the operation is not convenient, and there are significant difficulties when TLS is enabled.
Therefore, we have added a built-in debug mode to ADC, which can be enabled using the `--verbose <integer>` parameter. When this parameter is set to 2, ADC will print the request and response parts of each internal API call to help with debugging.
This parameter can also be used to hide logs. When this parameter is set to 0, ADC will hide all general logs except for errors.
### Strengthening Remote Resource Processing
> This feature was introduced in version 0.9.
Since ADC is not the only way to configure services, routes, etc., users can also use the API7 Enterprise dashboard to achieve this through simple operations. This has led to a problem: the operations on the dashboard will use randomly generated resource IDs, while ADC uses the resource name in the YAML configuration to generate a fixed resource ID for precise resource location.
This means that if the user creates a resource on the dashboard, ADC will not be able to locate it by the resource ID. ADC cannot modify or delete the resources created on the dashboard, but these resources will still appear in the change detection, but cannot be operated on correctly.
Therefore, we have optimized the relevant logic of the API7 backend ADC. If the remote and local both contain resources with the same name, but the IDs cannot be matched, ADC can correctly delete the remote resource and create a new one based on the local configuration, in which case the ID will be generated by ADC based on the resource name and can be used for subsequent resource lookup. API7 dashboard users will not be affected, and resources created by ADC can still be viewed on the dashboard.
### Supporting ADC Extension Fields in OpenAPI Converter
> This feature was introduced in version 0.10.
To build a coherent pipeline from OpenAPI to ADC to API7, the OpenAPI converter needs to inject the required fields into the ADC YAML configuration file based on our needs.
For example, to modify the `pass_host` field in the service's upstream, previously we could only manually use the converter to convert the OpenAPI to the ADC configuration file, manually modify the `pass_host` field, and then submit the modified file to the Git repository for the CI/CD pipeline to execute the ADC sync. This process is not coherent and requires a lot of manual intervention.
Now, through the introduced `x-adc` series of extensions, users only need to write the extension fields at specific locations in the OpenAPI document, and ADC will correctly write these fields in the generated configuration file. With these extensions, users can directly modify any content in the ADC configuration on the OpenAPI, such as adding labels, adding plugins, and overriding the default configuration of services/upstreams/routes.
As a result, by maintaining only one OpenAPI file, the OpenAPI-ADC-API7 pipeline can be implemented in a one-stop manner, greatly simplifying the GitOps workflow for API gateway configuration.
## Conclusion
The declarative configuration tool [ADC](https://github.com/api7/adc) launched by API7.ai can help enterprises realize GitOps management of API gateways. In the new versions 0.8, 0.9, and 0.10, the tool has been functionally optimized and upgraded, adding features such as resource change monitoring and filtering. These new features inject new momentum into the full API lifecycle management.
These new capabilities allow ADC to better meet enterprises' needs for API gateway GitOps management, improving the efficiency and flexibility of API management. | yilialinn | |
1,876,046 | Tab Style Help | Goodnight. trying to change the color of my TAB label. I'm trying to follow the tutorials I see on... | 0 | 2024-06-04T02:23:02 | https://dev.to/natanael_junior_5ce3e158a/tab-style-help-p99 | scss, angular, tab, material | Goodnight. trying to change the color of my TAB label. I'm trying to follow the tutorials I see on the internet, but without success. They all look like the code below (my scss file):
In reality I want to modify the entire style of all tabs, but all attempts have failed so far. In the tutorials it is successful but in my code I am not successful. Where am I going wrong? (Below the component that is "mat-tab-group")
 | natanael_junior_5ce3e158a |
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