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 |
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1,889,221 | Array high order methods | High-order array methods in JavaScript are methods that operate on arrays and typically take other... | 0 | 2024-06-15T04:38:37 | https://dev.to/__khojiakbar__/array-high-order-methods-l5f | array, methods, javascript | >High-order array methods in JavaScript are methods that operate on arrays and typically take other functions as arguments. These methods allow for powerful and concise ways to manipulate and analyze data within arrays. Here’s a broad explanation of some of the most commonly used high-order array methods:
#**1. map()**
**Purpose:** Creates a new array populated with the results of calling a provided function on every element in the calling array.
- **return** does not work.
- Can work like forEach().
- Conditionals does not work.
**Usage:** Transforming data by applying a function to each element.
```
const numbers = [1, 2, 3, 4];
const doubled = numbers.map(num => num * 2); // doubled is [2, 4, 6, 8]
```
#**2. filter()**
**Purpose:** Creates a new array with all elements that pass the test implemented by the provided function.
- **forEach and map integration**
- no modification
**Usage:** Filtering out elements based on a condition.
```
const numbers = [1, 2, 3, 4];
const evens = numbers.filter(num => num % 2 === 0); // evens is [2, 4]
```
#**3. reduce()**
**Purpose:** Executes a reducer function (that you provide) on each element of the array, resulting in a single output value.
**Usage:** Summing up values, calculating averages, or accumulating a value based on array elements.
**Structure** let nArr = array.reduce(()=>{}, 0)
```
const numbers = [1, 2, 3, 4];
const sum = numbers.reduce((accumulator, currentValue) => accumulator + currentValue, 0); // sum is 10
```
#**4. forEach()**
**Purpose:** Executes a provided function once for each array element.
**Usage:** Performing an action on each element, often used instead of a for loop for iteration.
**return** x
> ! **return** does not work
```
const numbers = [1, 2, 3, 4];
numbers.forEach(num => console.log(num)); // Logs 1, 2, 3, 4 to the console
```
#**5. find()**
**Purpose:** Returns the value of the first element in the array that satisfies the provided testing function.
**Usage:** Finding a single element that matches a condition.
- Looks like filter()
- Conditionals does not work.
```
const numbers = [1, 2, 3, 4];
const found = numbers.find(num => num > 2); // found is 3
```
#**6. findIndex()**
**Purpose:** Returns the index of the first element in the array that satisfies the provided testing function.
**Usage:** Finding the index of a single element that matches a condition.
```
const numbers = [1, 2, 3, 4];
const index = numbers.findIndex(num => num > 2); // index is 2
```
#**7. some()**
**Purpose:** Tests whether at least one element in the array passes the test implemented by the provided function.
**Usage:** Checking if any elements meet a condition.
```
const numbers = [1, 2, 3, 4];
const hasEven = numbers.some(num => num % 2 === 0); // hasEven is true
```
#**8. every()**
**Purpose:** Tests whether all elements in the array pass the test implemented by the provided function.
**Usage:** Checking if all elements meet a condition.
```
const numbers = [1, 2, 3, 4];
const allEven = numbers.every(num => num % 2 === 0); // allEven is false
```
#**9. sort()**
**Purpose:** Sorts the elements of an array in place and returns the sorted array.
**Usage:** Sorting elements based on specified criteria.
```
const numbers = [4, 2, 3, 1];
numbers.sort(); // numbers is now [1, 2, 3, 4]
const words = ['apple', 'banana', 'cherry'];
words.sort((a, b) => a.localeCompare(b)); // words is now ['apple', 'banana', 'cherry']
words.sort()
```
| __khojiakbar__ |
1,889,279 | Solidity, Smart Contract | Blockchain and smart contracts revolutionize digital interactions, ensuring security, transparency,... | 0 | 2024-06-15T06:00:21 | https://dev.to/bartraders89/solidity-smart-contract-oog | development, blockchain, smartcontract, cryptocurrency | Blockchain and smart contracts revolutionize digital interactions, ensuring security, transparency, and efficiency. These technologies empower innovation in finance, healthcare, and beyond. Developers can explore tutorials and resources on blockchain integration to harness its potential. Enhance your projects with smart contract capabilities today and stay ahead in a decentralized future.
| bartraders89 |
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| michellejordan02 | |
1,889,276 | Top 10 Free AI Tools to Boost Your Daily Life Productivity | In today’s fast-paced world, maximizing productivity is essential. AI tools have become increasingly... | 0 | 2024-06-15T05:55:17 | https://dev.to/futuristicgeeks/top-10-free-ai-tools-to-boost-your-daily-life-productivity-4g93 | ai, webdev, aitools, beginners | In today’s fast-paced world, maximizing productivity is essential. AI tools have become increasingly popular for helping individuals manage their time, streamline tasks, and improve efficiency. Here are the top 10 free AI tools that can significantly enhance your daily life productivity.
1. ChatGPT by OpenAI
2. Notion
3. Todoist
4. Grammarly
5. Otter.ai
6. Microsoft To Do
7. Trello
8. Calendly
9. Canva
10. RescueTime
Check out our latest article for a detailed report on Free AI Tools to Boost Your Daily Life Productivity:
https://futuristicgeeks.com/top-10-free-ai-tools-to-boost-your-daily-life-productivity/
Stay ahead with the latest tech insights by following us and visiting our website for more in-depth articles: [FuturisticGeeks](https://futuristicgeeks.com). Don't miss out on staying updated with the top AI tools and trends!
| futuristicgeeks |
1,889,275 | How you Can Make Money Online 💻💸 | Making money online is an exciting and accessible opportunity for anyone with an internet connection.... | 0 | 2024-06-15T05:52:49 | https://dev.to/anis12345/how-you-can-make-money-online-39gn | makemoneyonline, workfromhome | Making money online is an exciting and accessible opportunity for anyone with an internet connection. Here are some popular ways you can start earning:
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| anis12345 |
1,889,274 | JavaScript: CallBack Hell | function getArticlesData(id, callback) { // Simulate async operation setTimeout(() => { ... | 0 | 2024-06-15T05:49:04 | https://dev.to/alamfatima1999/javascript-callback-hell-1a1f | ```JS
function getArticlesData(id, callback) {
// Simulate async operation
setTimeout(() => {
callback([{ username: 'user1' }, { username: 'user2' }]); // Dummy data
}, 1000);
}
function getUserData(username, callback) {
// Simulate async operation
setTimeout(() => {
callback(username + '_name'); // Dummy transformation
}, 1000);
}
function getAddress(name, callback) {
// Simulate async operation
setTimeout(() => {
callback(name + '_address'); // Dummy transformation
}, 1000);
}
// Calling the functions in a callback hell manner
getArticlesData(20, (articles) => {
console.log("article lists", articles);
// Assuming you want to process the first article in the list
getUserData(articles[0].username, (name) => {
console.log(name);
getAddress(name, (item) => {
console.log(item);
// This goes on and on...
});
});
});
```
| alamfatima1999 | |
1,889,273 | How to Handle Errors in an Industry-Grade Node.js Application | This is the thirteenth blog of my series where I am writing how to write code for an industry-grade... | 0 | 2024-06-15T05:48:11 | https://dev.to/md_enayeturrahman_2560e3/how-to-handle-errors-in-an-industry-grade-nodejs-application-217b | errors, express, node, javascript |
This is the thirteenth blog of my series where I am writing how to write code for an industry-grade project so that you can manage and scale the project.
The first twelve blogs of the series were about "How to set up eslint and prettier in an express and typescript project", "Folder structure in an industry-standard project", "How to create API in an industry-standard app", "Setting up global error handler using next function provided by express", "How to handle not found route in express app", "Creating a Custom Send Response Utility Function in Express", "How to Set Up Routes in an Express App: A Step-by-Step Guide", "Simplifying Error Handling in Express Controllers: Introducing catchAsync Utility Function", "Understanding Populating Referencing Fields in Mongoose", "Creating a Custom Error Class in an express app", "Understanding Transactions and Rollbacks in MongoDB" and "Updating Non-Primitive Data Dynamically in Mongoose". You can check them in the following link.
https://dev.to/md_enayeturrahman_2560e3/how-to-set-up-eslint-and-prettier-1nk6
https://dev.to/md_enayeturrahman_2560e3/folder-structure-in-an-industry-standard-project-271b
https://dev.to/md_enayeturrahman_2560e3/how-to-create-api-in-an-industry-standard-app-44ck
https://dev.to/md_enayeturrahman_2560e3/setting-up-global-error-handler-using-next-function-provided-by-express-96c
https://dev.to/md_enayeturrahman_2560e3/how-to-handle-not-found-route-in-express-app-1d26
https://dev.to/md_enayeturrahman_2560e3/creating-a-custom-send-response-utility-function-in-express-2fg9
https://dev.to/md_enayeturrahman_2560e3/how-to-set-up-routes-in-an-express-app-a-step-by-step-guide-177j
https://dev.to/md_enayeturrahman_2560e3/simplifying-error-handling-in-express-controllers-introducing-catchasync-utility-function-2f3l
https://dev.to/md_enayeturrahman_2560e3/understanding-populating-referencing-fields-in-mongoose-jhg
https://dev.to/md_enayeturrahman_2560e3/creating-a-custom-error-class-in-an-express-app-515a
https://dev.to/md_enayeturrahman_2560e3/understanding-transactions-and-rollbacks-in-mongodb-2on6
https://dev.to/md_enayeturrahman_2560e3/updating-non-primitive-data-dynamically-in-mongoose-17h2
Proper error handling is crucial for developing a robust, industry-grade application. In order to handle errors effectively, we first need to understand the different types of errors that can occur. Errors can be categorized as follows:
**Operational Errors:** These are errors that can be anticipated during normal operations:
- Invalid user inputs.
- Failed server startup.
- Failed database connection.
- Invalid authentication token.
**Programmatical Errors:** These are errors introduced by developers during development:
- Using undefined variables.
- Accessing non-existent properties.
- Passing incorrect types to functions.
- Using req.params instead of req.query.
**Unhandled Rejections:** These occur when promises are rejected and not handled.
**Uncaught Exceptions:** These occur when errors in synchronous code are not caught.
Operational and programmatical errors can be managed within an Express app using a global error handler, throwing new errors, or using the next function. However, unhandled rejections and uncaught exceptions can occur inside or outside of an Express application, requiring proper handling.
Errors in an application are not file-specific. They can originate from routes, controllers, services, validations, utilities, or other files.
Each type of error follows a unique pattern. For example, Zod provides error details in an object with an issues array, while Mongoose provides error details in an errors object. Additionally, Mongoose cast errors and duplicate errors have distinct patterns.
Sending raw errors directly to the frontend makes it difficult to handle them uniformly. Therefore, we need to format all possible errors at the backend and send a common pattern to the frontend. This involves sending all errors to a global error handler, creating specific handlers for each type of error, converting them to a common pattern, and then sending a response to the user. The frontend will receive a consistent error structure: success, message, errorSources, and stack. The stack field, which pinpoints the error, will only be sent in the development environment to avoid increasing the application's vulnerability in production.
### Creating a Global Error Handler
First, we will create a globalErrorHandler.ts file:
```javascript
/* eslint-disable @typescript-eslint/no-unused-vars */
/* eslint-disable no-unused-vars */
import { ErrorRequestHandler } from 'express';
import { ZodError } from 'zod';
import config from '../config';
import AppError from '../errors/AppError';
import handleCastError from '../errors/handleCastError';
import handleDuplicateError from '../errors/handleDuplicateError';
import handleValidationError from '../errors/handleValidationError';
import handleZodError from '../errors/handleZodError';
import { TErrorSources } from '../interface/error';
const globalErrorHandler: ErrorRequestHandler = (err, req, res, next) => {
// Setting default values
let statusCode = 500; // Default status code if none is received
let message = 'Something went wrong!'; // Default message if none is received
let errorSources: TErrorSources = [
{
path: '',
message: 'Something went wrong',
},
]; // Default error sources if none is received
if (err instanceof ZodError) { // Check if error is an instance of ZodError
const simplifiedError = handleZodError(err); // Format error using handleZodError
statusCode = simplifiedError?.statusCode; // Set status code from formatted error
message = simplifiedError?.message; // Set message from formatted error
errorSources = simplifiedError?.errorSources; // Set error sources from formatted error
} else if (err?.name === 'ValidationError') { // Check if error is a Mongoose validation error
const simplifiedError = handleValidationError(err); // Format error using handleValidationError
statusCode = simplifiedError?.statusCode; // Set status code from formatted error
message = simplifiedError?.message; // Set message from formatted error
errorSources = simplifiedError?.errorSources; // Set error sources from formatted error
} else if (err?.name === 'CastError') { // Check if error is a Mongoose cast error
const simplifiedError = handleCastError(err); // Format error using handleCastError
statusCode = simplifiedError?.statusCode; // Set status code from formatted error
message = simplifiedError?.message; // Set message from formatted error
errorSources = simplifiedError?.errorSources; // Set error sources from formatted error
} else if (err?.code === 11000) { // Check if error is a Mongoose duplicate key error
const simplifiedError = handleDuplicateError(err); // Format error using handleDuplicateError
statusCode = simplifiedError?.statusCode; // Set status code from formatted error
message = simplifiedError?.message; // Set message from formatted error
errorSources = simplifiedError?.errorSources; // Set error sources from formatted error
} else if (err instanceof AppError) { // Check if error is an instance of AppError
statusCode = err?.statusCode; // Set status code from error
message = err.message; // Set message from error
errorSources = [
{
path: '',
message: err?.message,
},
];
} else if (err instanceof Error) { // Check if error is a generic error
message = err.message; // Set message from error
errorSources = [
{
path: '',
message: err?.message,
},
];
}
// Return response
return res.status(statusCode).json({
success: false,
message,
errorSources,
err,
stack: config.NODE_ENV === 'development' ? err?.stack : null,
});
};
export default globalErrorHandler;
```
### Handling Zod Errors
```javascript
// globalErrorhandler.ts file
import { ZodError } from 'zod'; // Importing ZodError from zod.
import handleZodError from '../errors/handleZodError'; // Importing handleZodError file
if (err instanceof ZodError) { // Check if error is an instance of ZodError
const simplifiedError = handleZodError(err); // Format error using handleZodError
statusCode = simplifiedError?.statusCode; // Set status code from formatted error
message = simplifiedError?.message; // Set message from formatted error
errorSources = simplifiedError?.errorSources; // Set error sources from formatted error
}
// handleZodError.ts file
import { ZodError, ZodIssue } from 'zod'; // Importing ZodError and ZodIssue type from zod. ZodIssue is the type for each item inside the issues array given by zod error.
import { TErrorSources, TGenericErrorResponse } from '../interface/error'; // Importing type declared for error sources and generic error response.
const handleZodError = (err: ZodError): TGenericErrorResponse => {
const errorSources: TErrorSources = err.issues.map((issue: ZodIssue) => { // Loop through issues array provided by Zod
return {
path: issue?.path[issue.path.length - 1], // Zod provides the path at the last index of path array. Retrieve it.
message: issue.message, // Retrieve message from issue.
};
});
const statusCode = 400; // Set the status code
return { // Return status code, fixed message, and errorSources
statusCode,
message: 'Validation Error',
errorSources,
};
};
export default handleZodError;
```
### Handling Mongoose Validation Errors
```javascript
// globalErrorhandler.ts file
else if (err?.name === 'ValidationError') { // Check if error is a Mongoose validation error
const simplifiedError = handleValidationError(err); // Format error using handleValidationError
statusCode = simplifiedError?.statusCode; // Set status code from formatted error
message = simplifiedError?.message; // Set message from formatted error
errorSources = simplifiedError?.errorSources; // Set error sources from formatted error
}
// handleValidationError.ts file
import mongoose from 'mongoose';
import { TErrorSources, TGenericErrorResponse } from '../interface/error';
const handleValidationError = (
err: mongoose.Error.ValidationError, // Importing type from Error property within mongoose
): TGenericErrorResponse => { // TGenericErrorResponse is a type for the return so that same style is followed by the different error handler and maintain consistency.
const errorSources: TErrorSources = Object.values(err.errors).map( // Inside the err object there is a property named errors and its value is an array i mapped its value here
(val: mongoose.Error.ValidatorError | mongoose.Error.CastError) => {
return {
path: val?.path, // Extract path from the val object
message: val?.message, // Extract message from the val object
};
},
);
const statusCode = 400; // Set the status code
return { // Return status code, fixed message, and errorSources
statusCode,
message: 'Validation Error',
errorSources,
};
};
export default handleValidationError;
```
### Handling Mongoose Cast Errors
```javascript
// globalErrorhandler.ts file
else if (err?.name === 'CastError') { // Check if error is a Mongoose cast error
const simplifiedError = handleCastError(err); // Format error using handleCastError
statusCode = simplifiedError?.statusCode; // Set status code from formatted error
message = simplifiedError?.message; // Set message from formatted error
errorSources = simplifiedError?.errorSources; // Set error sources from formatted error
}
// handleCastError.ts file
import mongoose from 'mongoose';
import { TErrorSources, TGenericErrorResponse } from '../interface/error';
const handleCastError = (
err: mongoose.Error.CastError, // Importing type from Error property within mongoose
): TGenericErrorResponse => {
const errorSources: TErrorSources = [
{
path: err.path, // Extract path from the err object
message: err.message, // Extract message from the err object
},
];
const statusCode = 400; // Set the status code
return { // Return status code, fixed message, and errorSources
statusCode,
message: 'Invalid ID',
errorSources,
};
};
export default handleCastError;
```
### Handling Mongoose Duplicate Key Errors
```javascript
// globalErrorhandler.ts file
else if (err?.code === 11000) { // Check if error is a Mongoose duplicate key error
const simplifiedError = handleDuplicateError(err); // Format error using handleDuplicateError
statusCode = simplifiedError?.statusCode; // Set status code from formatted error
message = simplifiedError?.message; // Set message from formatted error
errorSources = simplifiedError?.errorSources; // Set error sources from formatted error
}
// handleDuplicateError.ts file
import { TErrorSources, TGenericErrorResponse } from '../interface/error';
const handleDuplicateError = (err: any): TGenericErrorResponse => {
// Extract the duplicated field name from the error message
const match = err.message.match(/"([^"]*)"/); // Use regex to extract field name within quotes
const extractedMessage = match && match[1]; // Extract the first matched group from the regex match
const errorSources: TErrorSources = [
{
path: '', // No specific path for duplicate error
message: `${extractedMessage} already exists`, // Customize the error message
},
];
const statusCode = 400; // Set the status code
return { // Return status code, fixed message, and errorSources
statusCode,
message: 'Duplicate Key Error',
errorSources,
};
};
export default handleDuplicateError;
```
### Handling Unhandled Rejections and Uncaught Exceptions
Unhandled rejections and uncaught exceptions can cause your application to crash if not properly handled. Here's how to handle them:
```javascript
import { Server } from 'http';
import mongoose from 'mongoose';
import app from './app';
import config from './config';
let server: Server;
async function main() {
try {
await mongoose.connect(config.database_url as string); // Connect to the database
server = app.listen(config.port, () => { // Start the server
console.log(`App is listening on port ${config.port}`);
});
} catch (err) {
console.log(err); // Log the error if database connection fails
}
}
main();
// Handle unhandled promise rejections
process.on('unhandledRejection', (reason, promise) => {
console.log('Unhandled Rejection at:', promise, 'reason:', reason);
if (server) {
server.close(() => {
process.exit(1); // Exit the process after server closes
});
} else {
process.exit(1); // Exit the process immediately if server is not running
}
});
// Handle uncaught exceptions
process.on('uncaughtException', (err) => {
console.log('Uncaught Exception thrown:', err);
process.exit(1); // Exit the process immediately
});
```
### Conclusion
By understanding and properly handling different types of errors, we can create a more robust and maintainable Node.js application. Each type of error, whether from Zod, Mongoose, or other sources, requires a specific handling strategy to ensure consistency and clarity in error responses. By implementing a global error handler and individual error handlers, we can ensure that our application provides informative and consistent error messages to the frontend, improving both user experience and developer productivity.
| md_enayeturrahman_2560e3 |
1,889,272 | Made a simple Tic-Tac-Toe game | This was one of my academy's projects. It was to pick a topic out of a list and I picked TTT. I got a... | 0 | 2024-06-15T05:47:47 | https://dev.to/zoobob5/made-a-simple-tic-tac-toe-game-4of0 | python, vscode, github | This was one of my academy's projects. It was to pick a topic out of a list and I picked TTT. I got a little side tracked in making is so it took me a little bit longer to make it but if i stayed on track it could've taken me a day. I just did a simple grid layout using tk and took user inputs to assign a simple player one and player two interaction. it is a 3 x 3 clickable grid. In short, this project showed me a nice proper semi productive way to use all of the things i learn into one game.
Here is the link to the game:
https://github.com/Zoobob5/Tic-Tac/tree/2c39a402717881d8b41ef096db3113c4c3814cb5
| zoobob5 |
1,889,271 | Holistic Healing: Nurturing Wellness from Within | In the realm of health and wellness, holistic healing emerges as a comprehensive approach that... | 0 | 2024-06-15T05:40:47 | https://dev.to/rooseveltrose/holistic-healing-nurturing-wellness-from-within-il8 | holistichealing | In the realm of health and wellness, **[holistic healing](https://iah.fit/)** emerges as a comprehensive approach that addresses the interconnectedness of mind, body, and spirit. This integrative method emphasizes treating the whole person rather than focusing solely on symptoms, aiming to restore balance and promote overall well-being. By combining various natural therapies and lifestyle adjustments, holistic healing offers individuals a pathway to optimal health and vitality.
**The Essence of Holistic Healing**
Holistic healing is grounded in the belief that each individual is a complex system influenced by physical, emotional, mental, and spiritual factors. This approach recognizes that imbalances in any of these areas can impact overall health. Unlike conventional medicine, which tends to treat specific ailments in isolation, holistic healing takes a broader view, seeking to uncover and address the root causes of health issues.
**Fundamental Principles of Holistic Healing**
Whole-Person Care: Holistic healing considers the interconnectedness of all aspects of an individual’s life, aiming to achieve balance and harmony.
Natural Remedies: Emphasizes the use of natural therapies, dietary adjustments, and lifestyle changes to support the body’s innate healing abilities.
Preventative Approach: Focuses on proactive measures to prevent illness and promote long-term health through healthy habits and mindful living.
Empowerment: Encourages individuals to actively participate in their health journey, making informed decisions and taking responsibility for their well-being.
**Practices in Holistic Healing**
Holistic healing integrates a variety of practices and therapies designed to support overall health and wellness.
**Nutrition and Dietary Guidance**
Nutrition plays a crucial role in holistic healing by providing essential nutrients that support bodily functions and promote health. Whole foods, rich in vitamins, minerals, and antioxidants, are emphasized to nourish the body and support its natural healing processes.
**Physical Activity and Exercise**
Regular exercise is essential for maintaining **[wellness](https://iah.fit/)**. Holistic approaches advocate for activities that not only enhance physical fitness but also contribute to mental clarity and emotional balance. Yoga, qigong, and other mindful movement practices are often recommended for their holistic benefits.
**Mind-Body Techniques**
Mind-body techniques such as meditation, mindfulness, and breathwork are integral to holistic healing. These practices help reduce stress, improve relaxation, and enhance overall mental and emotional well-being. By fostering a deeper connection between mind and body, individuals can cultivate resilience and inner peace.
**Complementary Therapies**
Holistic healing incorporates various complementary therapies, including acupuncture, massage therapy, chiropractic care, and herbal medicine. These therapies aim to restore balance, alleviate discomfort, and support the body’s natural healing mechanisms.
**Benefits of Holistic Healing**
The holistic approach to health offers numerous benefits that contribute to a balanced and fulfilling life:.
Enhanced Physical Well-Being: Supports overall health through natural remedies and lifestyle adjustments.
Improved Mental Clarity: Mind-body practices enhance focus, concentration, and cognitive function.
Emotional Balance: Reduces stress, anxiety, and promotes emotional resilience.
Spiritual Connection: Cultivates a deeper sense of purpose and spiritual well-being.
**Conclusion**
Holistic healing represents a transformative approach to health and wellness, emphasizing the importance of integrating mind, body, and spirit. By embracing this holistic philosophy, individuals can nurture their health from within, achieving a state of balance and vitality. As awareness grows about the benefits of holistic healing, more people are incorporating these practices into their lives to support their journey toward optimal health and well-being. Ultimately, holistic healing empowers individuals to take proactive steps toward a healthier lifestyle, fostering a profound sense of well-being that encompasses physical vitality, mental clarity, emotional resilience, and spiritual connection.
| rooseveltrose |
1,889,270 | AI-Powered Landing Pages: The Future of SaaS Marketing | In the ever-competitive world of SaaS marketing, crafting a captivating and high-converting landing... | 0 | 2024-06-15T05:38:48 | https://dev.to/gptconsole/ai-powered-landing-pages-the-future-of-saas-marketing-46h |
In the ever-competitive world of SaaS marketing, crafting a captivating and high-converting landing page is crucial for attracting new customers and driving subscriptions. Traditionally, this process involved significant time, resources, and potentially hiring web developers or designers. However, the landscape is shifting dramatically with the introduction of AI-powered tools like Pixie, your AI agent from GPTConsole.
Pixie offers a revolutionary solution: the **Free Landing Page** Generator. This powerful tool leverages the power of AI to generate professional-looking landing pages within minutes, without any coding knowledge required.
**Pixie: A Glimpse into the Future of Landing Page Creation**
Pixie goes beyond a simple landing page builder. It utilizes cutting-edge AI technology to generate customizable landing pages based on your textual descriptions. This means you can describe your ideal landing page layout, content, and visual elements, and Pixie takes care of the rest.
**The Free Landing Page Generator: A Powerful Preview of Pixie's Capabilities**
The Free Landing Page Generator serves as a fantastic introduction to Pixie's full potential. While it focuses on landing pages, it's just a glimpse into the diverse range of web applications Pixie can create with simple text prompts.
**Simple Yet Effective Customization:**
The Free Landing Page Generator offers a user-friendly interface that empowers you to customize your landing page with ease. Here's what you can do:
- **Edit Text:** Pixie generates placeholder content for various sections like headlines, descriptions, and calls to action (CTAs). You can easily replace this text with your own messaging, tailoring it to your specific brand and target audience.
- **Change Images:** The Free Landing Page Generator provides a selection of stock images. However, you can swap them out with your own unique visuals, further strengthening your brand identity and visual appeal.
- **Remove Sections:** Pixie's landing page template includes eleven sections, such as header, features, applications, stats, teams, testimonials, pricing, FAQ, blogs, and footer.
You can easily remove sections that don't align with your specific needs, ensuring your landing page is concise and focused.
**Building Your Landing Page with Pixie: A Step-by-Step Guide**
Here's a quick guide to getting started with Pixie's Free Landing Page Generator:
1. **Visit the Free Landing Page Generator:** Head over to [Landing Pages](https://landingpages.gptconsole.ai/) to access the generator.
2. **Describe Your Vision:** In the user-friendly interface, provide a brief description of your SaaS offering and the key message you want to convey on your landing page.
3. **Customize the Template:** Pixie generates a landing page based on your descriptions. You can then customize the text, visuals, and sections to create a page that perfectly reflects your brand and offering.
4. **Preview and Download:** Once satisfied with your creation, preview it to ensure everything looks as intended. You can then download the landing page code for integration with your website.
**Result:**[Link](https://pixie.gptconsole.ai/fd25ba9a-9bb9-44f5-b77d-95950c23e28e)
**Pixie's Free Landing Page Generator: A Well-Rounded Template for Success**
The Free Landing Page Generator provides a well-rounded template with eleven sections, allowing you to craft a comprehensive and informative landing page:
- **Header:** Make a strong first impression with a captivating headline, logo, and clear value proposition.
- **Features:** Highlight the key features and benefits of your SaaS product or service
| vincivinni | |
1,889,268 | Top 5 Applications of Die Sinking Machines | screenshot-1708712138756.png Top 5 How Exactly To Make Usage Of Die Sinking Machines You might must... | 0 | 2024-06-15T05:32:18 | https://dev.to/mithokha_saderha_c6bb89ea/top-5-applications-of-die-sinking-machines-3fg1 | screenshot-1708712138756.png
Top 5 How Exactly To Make Usage Of Die Sinking Machines
You might must know more about die sinking devices if you have ever wondered exactly how components that are metal made. These devices have actually a lot of advantages, including safety features and revolutionary technology allowing for precise and manufacturing which is efficient.
1. Manufacturing Metal Parts
The very first and a good amount of apparent application of die devices which are sinking within manufacturing steel parts. Die sinking are acclimatized to create steel pieces that have a shape which is specific design. These devices make use of a charged energy discharge option to erode the steel and produce the form which is specified. This course of action is extremely accurate and will be employed to produce a selection of metal parts, from small bolts to gears being big every thing in the center.
2. Making Molds
Another application of die devices which may be sinking to make molds. Molds are employed in manufacturing to produce duplicate parts or pieces. Die Sinking Machines are used to create the mildew itself, that will be utilized to produce the item which is last. This technique is extremely efficient and accurate, enabling the creation of complex molds and components with simplicity.
3. Jewelry Making
Die sinking devices could be present in additionally precious jewelry creating. These devices take advantage of a procedure which is identical manufacturing metal parts and which you can use to create intricate precious jewelry designs. Jewelers might use these machines to create unique, customized pieces with regards to their customers, or to mass-produce designs which are specific their collections.
4. Creative Applications
Die sinking products could be found in additionally applications that are creative. Artists might use these devices to generate steel which is intricate or to add unique details making use of their work. Utilizing the precision and accuracy of die machines which are sinking artists could make pieces which are both breathtaking and practical.
5. DIY Projects
Finally, die sinking products works extremely well in DIY projects. The unit are usually utilized by hobbyists who wants to produce steel which is exclusive for his or her domiciles or collections that are personal. Using the unit which is correct some knowledge which is basic you can now use to produce their own customized steel pieces.
How to start using a Die Sinking device
Employing a die device which is die sinking edm seem daunting, but it is really fairly simple. The action which is initial constantly to choose the machine which is proper your needs. It is additionally vital to glance at the proportions connected with device, the kind of metal you will be coping with, plus the standard of precision you'll need. After you have opted for your device, it's the time which is right arrange it.
The setup process will change on the basis of the device you're making usage of, as a whole, you shall want to link the apparatus to a supply which is electric prepare the metal you will end up using. You will also have to find the electrode which is right your device, since this will determine the size and shape associated with the steel pieces you're going to be creating.
The moment your device is established, you can begin working. Simply place the metal within the unit and use the settings to guide the electrode inside the steel. The unit utilizes discharges which can be electric erode the metal and create the necessary form.
Provider and Quality
When selecting a die machine which is sinking you'll want to give consideration to service and quality. You will need to buy device from the maker which is reputable provides customer support which is very good. Because of this, in case you shall have the help you will require which you need help along with your machine or have any problems.
You may also desire to determine a tool this will be actually made from top-notch materials and features technology which is revolutionary. This could make fully sure your device is in fact durable and efficient, allowing you to produce steel components with simplicity.
Security Features
Finally, it is important to start contemplating safety features whenever using a die device which is sinking. These devices might even be dangerous and used correctly, so it will be vital to consider security protocols making use associated with the device in a fashion which is safe. Look for products that function safety features such as for instance automated shut-off or guards all over electrodes.
In conclusion, die sink edm machine have a lot of useful applications, from manufacturing metal parts to creating custom jewelry and artwork. By choosing a machine with the right features and following proper safety protocols, anyone can use a die sinking machine to create precise and accurate metal pieces.
Source: https://www.teruimachines.com/product-znc350-hot-sale-cnc-working-fluid-capacity-280l-znc-die-sinking-machine-edm | mithokha_saderha_c6bb89ea | |
1,889,265 | How to Maintain High-Quality Standards with Your Die Sinking Machine | screenshot-1708712138756.png Die sinking machines are a valuable tool for creating high-quality metal... | 0 | 2024-06-15T05:24:57 | https://dev.to/mithokha_saderha_c6bb89ea/how-to-maintain-high-quality-standards-with-your-die-sinking-machine-373n | screenshot-1708712138756.png
Die sinking machines are a valuable tool for creating high-quality metal components quickly and accurately. To ensure that your machine performs at its best, it is essential to maintain its high-quality standards. Here are some tips on how to keep your die sinking machine in top condition.
Advantages of Die Sinking Machine
Die sinking offer several benefits, including accuracy, rate, and effectiveness. These products trigger steel which is complex with tight tolerances and designs that are intricate. They could additionally produce large degrees of components quickly and consistently, making them well suited for mass production. With all the current maintenance which is right die sinking machines provides benefit which is quality, spending less and period of time in the end.
Innovation and protection
In the long run, Die Sinking Machines have actually encountered innovations which are numerous improve their gratification and safety. Modern products have different safety features, such as for example emergency stops, safety guards, and interlocks, to avoid accidents and protect users from damage. Some devices likewise have automatic unit changers and programmable controls that help more accurate and machining which is efficient.
Simple suggestions to Use Die Sinking Machine
Before using a die device which is sinking it is crucial to master via an manual which is individual to comprehend how it works and its safety features. Constantly wear appropriate individual equipment which is protective such as safety eyeglasses and ear protection, and make certain that the workpiece is guaranteed properly.
The period which is close to program the product, either manually or through computer-aided design (CAD) computer programs. Don't forget to enter the dimensions which are perfect machining parameters doing the duty. Following the program is put, the product starts the machining procedure, which can simply take hours being several. Constantly monitor the equipment to see problems such as for example device workpiece or wear drift.
Provider and fix
Regular maintenance is crucial for keeping constantly your die sinking edm device working at its most readily useful. This includes cleansing and lubrication of moving components, checking the accuracy regarding the workpiece, and changing components that are worn-out. It really is highly suggested to schedule upkeep visits every couple of weeks to handle any problems that are potential they result significant downtime and repairs that can easily be high priced.
Quality Control for Die Sinking Unit
To steadfastly keep up top-quality requirements, it is crucial to ascertain an control which is great for your die sinking unit. This technique will include regular inspections regarding the workpiece to ensure that the requirements are met by it that are required. Its additionally wise to monitor the performance associated with the machine after a few years and analyze any discrepancies that take place. Also, make sure to maintain accurate papers regarding the machining parameters utilized for each and every working task, as this info will help figure out areas for enhancement and troubleshoot problems better.
Applications of Die Sinking Device
Die sinking products can be utilized in a true wide range of industries, including automotive, aerospace, and medical. They have been ideal for making elements such as for example gears, valves, and molds. The unit could work with various materials, including steel which is stainless aluminum, and copper. The applications of die sinking devices are diverse, making them an addition which is indispensable any production environment.
In conclusion, die sinking machines can provide significant benefits to your production process, such as accuracy, speed, and efficiency. To witness these benefits, it is crucial to keep the machine working at its best by following proper use, maintenance, and quality control procedures. Always prioritize safety when working with any machinery, and seek professional assistance for maintenance and repairs if necessary. With these guidelines in mind, you can maximize the potential of your cnc edm die sinking and produce high-quality metal components for your industry.
Source: https://www.teruimachines.com/product-znc350-hot-sale-cnc-working-fluid-capacity-280l-znc-die-sinking-machine-edm | mithokha_saderha_c6bb89ea | |
1,889,253 | Buy GitHub Accounts | https://dmhelpshop.com/product/buy-github-accounts/ Buy GitHub Accounts GitHub holds a crucial... | 0 | 2024-06-15T05:20:11 | https://dev.to/wocak78159/buy-github-accounts-3054 | machinelearning, datascience, database, html | https://dmhelpshop.com/product/buy-github-accounts/
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Email:dmhelpshop@gmail.com | wocak78159 |
1,889,252 | Optimizing Cloud Performance: Monitoring and Observability in the AWS Cloud | Read the unabridged version of this post on my blog: Practical Cloud Introduction In the... | 0 | 2024-06-15T05:17:12 | https://practicalcloud.net/optimizing-cloud-performance-monitoring-and-observability-in-the-aws-cloud/ | aws, monitoring, cloud, cloudcomputing | Read the unabridged version of this post on my blog: [Practical Cloud](https://practicalclod.net)
## Introduction
In the dynamic world of cloud computing, optimizing performance is crucial to ensuring that applications run smoothly and efficiently. Amazon Web Services (AWS) offers a robust suite of tools and services for monitoring and observability, which are essential for maintaining and enhancing the performance of cloud environments. This article delves into the best practices, tools, and strategies for optimizing cloud performance through monitoring and observability in AWS, while aligning with the AWS Well-Architected Framework.
## Understanding Monitoring and Observability
**Monitoring**
Monitoring refers to the process of collecting, analyzing, and using information to track the performance and health of cloud resources and applications. It involves:
**Metrics Collection:** Gathering data points about the performance of resources (CPU utilization, memory usage, disk I/O, etc.).
Logging: Recording events and transactions that occur within your cloud environment.
Alerting: Setting up notifications for specific conditions or thresholds.
**Observability**
Observability extends beyond traditional monitoring by providing insights into the internal states of systems through:
Traces: Detailed records of the flow of requests through systems.
Logs: Comprehensive and structured data about events.
Metrics: Quantitative data that provides a high-level overview of system performance.
## AWS Well-Architected Framework Overview
The AWS Well-Architected Framework helps cloud architects build secure, high-performing, resilient, and efficient infrastructure for their applications. It is based on five pillars:
Operational Excellence: Focuses on operations in the cloud, including monitoring and automation.
Security: Ensures that data and systems are protected.
Reliability: Ensures workloads perform intended functions correctly and consistently.
Performance Efficiency: Efficiently using computing resources to meet requirements.
Cost Optimization: Managing costs to maximize the value delivered.
AWS Monitoring and Observability Tools
AWS offers a comprehensive suite of tools to support monitoring and observability, which align with the Well-Architected Framework pillars:
## Amazon CloudWatch
Metrics and Alarms: Collect and track metrics, set alarms, and automatically respond to changes in your AWS resources.
Logs: Aggregate, monitor, and analyze log files.
Dashboards: Visualize your metrics and logs with customizable dashboards.
AWS X-Ray
Distributed Tracing: Trace requests as they travel through your entire application.
Service Map: Visualize relationships between components and identify performance bottlenecks.
Trace Analysis: Gain detailed insights into individual traces for debugging and optimization.
## AWS CloudTrail
Event Logging: Track user activity and API usage across your AWS infrastructure.
Security and Compliance: Ensure compliance by auditing and logging all access to your AWS services.
AWS Config
Resource Inventory: Track the configuration of AWS resources.
Change Management: Monitor and audit changes to resource configurations.
Compliance: Ensure compliance with internal policies and external regulations.
| kelvinskell |
1,889,251 | Safety Considerations When Operating a Die Sinking Machine | screenshot-1708712138756.png Exactly what is a Die Sinking Machine along with its benefits? A die... | 0 | 2024-06-15T05:17:08 | https://dev.to/mithokha_saderha_c6bb89ea/safety-considerations-when-operating-a-die-sinking-machine-5fd0 | screenshot-1708712138756.png
Exactly what is a Die Sinking Machine along with its benefits?
A die sinking is a manufacturing device employed for creating parts or molds produced from metal. It really is capable of creating complicated forms or geometries that would be hard to create using machining which is old-fashioned. Some of the top options that come with employing a die unit which is sinking it is more accurate, efficient, and will be offering a number which is top of. By having a die unit which is sinking molds and parts could be produced at a quicker speed minus the mistake.
Innovation in Die Sinking Machines - Ensuring Safety
Innovation is definitely an facet which is important of sinking devices. Manufacturers are constantly improving the safety popular top features of the equipment to ensure it is essentially effortless and safe to do business with. There are numerous security which is built-in which are implemented in die sinking machines to stop accidents. For instance, the device instantly shuts down in the event of overload, overheat, or breakdown. Furthermore, there exists a dependence on appropriate knowledge and training to use a die sinking machine properly and effortlessly.
Protection is Key -How to Use a Die Sinking device Safely
Security is called probably the most facet which is crucial of manufacturing unit, and Die Sinking Machines aren't any exclusion. Check out tips that are essential make certain you are utilizing your die sinking devices properly:
1. constantly wear protective equipment such as for example safety goggles, earplugs, gloves, and clothing which is protective.
2. Ensure that these products is precisely grounded and there are no actual leaks inside the cables.
3. constantly read the work which is running manual out certain you adhere to the guidelines very carefully.
4. Never make an effort to expel a mold or workpiece through the die device which is sinking though it is still running.
5. Ensure that the gear is switched off before trying to alter some of the settings.
Simple suggestions to Service a Die Sinking unit for enhanced Quality
A device which is well-maintained vital for attaining results that are high-quality. Regular upkeep and servicing linked to unit will boost the durability concerning the cnc edm die sinking making certain it works at its maximum effectiveness. Servicing includes steps such as for instance checking the wiring, inspecting the lubrication system, and making sure the protection features are operating exactly.
Applications of Die Sinking Machines
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Source: https://www.teruimachines.com/application/die-sinking-machine | mithokha_saderha_c6bb89ea | |
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1,889,249 | etcsh: an enhanced version of the original tcsh | etcsh is an enhanced version of the original tcsh, which is a version of the original Berkeley C... | 0 | 2024-06-15T05:15:12 | https://dev.to/mprog10/etcsh-an-enhanced-version-of-the-original-tcsh-415j | c, shell | [etcsh](https://github.com/Krush206/etcsh) is an enhanced version of the original tcsh, which is a version of the original Berkeley C shell implementing file name completion and command line editing.
etcsh features the following enhancements and fixes over the original tcsh.
• Function declarations;
• variable assignment from pipes and redirections;
• comments on interactive sessions;
• tell whether `stdin` is empty or not;
• variable expansion on expressions corrected;
• piped built-ins are forked;
• missing `test` built-in implemented;
• read-write variable flag;
• `exit` shall cancel lists.
More is to come. Feedbacks and contributions are much appreciated. | mprog10 |
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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. 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1,889,245 | Understanding Algorithms: The Building Blocks of Problem Solving | An algorithm is a step-by-step procedure for solving a problem or performing a task. It takes an... | 0 | 2024-06-15T05:03:29 | https://dev.to/arun_thakur_8894/understanding-algorithms-the-building-blocks-of-problem-solving-41ln | devchallenge, cschallenge, computerscience, beginners |
An algorithm is a step-by-step procedure for solving a problem or performing a task. It takes an input, processes it through a series of defined steps, and produces an output. Algorithms are fundamental to computer science, enabling efficient problem-solving and automation.
_Algorithms are fundamental to computer science because they provide clear instructions for tasks, making programs efficient and reliable. Understanding algorithms helps in problem-solving and optimizing performance, which are key skills in technology and everyday applications._ | arun_thakur_8894 |
1,889,244 | VL88 | VL88 xứng danh là nhà cái cá cược hàng đầu về sân chơi cung cấp sảnh cược trực tuyến hiện nay. Với... | 0 | 2024-06-15T05:02:43 | https://dev.to/vl88vlcom/vl88-3ka7 | VL88 xứng danh là nhà cái cá cược hàng đầu về sân chơi cung cấp sảnh cược trực tuyến hiện nay. Với kho trò chơi tại VL88 rất đa dạng tỷ lệ cược, mức thưởng cao, đặc biệt là các trò chơi rất ăn khách được kể đến như: Tài Xỉu, Baccarat, Xóc Đĩa, Roulette,..
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1,894,056 | Building a Robust Web Server in Go: A Step-by-Step Guide | We continue our journey implementing a real world web application in Golang in this blog post. In the... | 0 | 2024-06-19T20:29:40 | https://blog.gkomninos.com/building-a-robust-web-server-in-go-a-step-by-step-guide | coding, go, webdev, tutorial | ---
title: Building a Robust Web Server in Go: A Step-by-Step Guide
published: true
date: 2024-06-15 05:00:44 UTC
tags: coding,golang,webdev,Tutorial
canonical_url: https://blog.gkomninos.com/building-a-robust-web-server-in-go-a-step-by-step-guide
---
We continue our journey implementing a real world web application in Golang in this blog post. In the previous post we setup our docker development environment that just prints hello world. In this post we are going to setup a real webserver that it'... | gosom |
1,889,242 | "this" Keyword in OOP | This is a submission for DEV Computer Science Challenge v24.06.12: One Byte Explainer. ... | 0 | 2024-06-15T04:58:44 | https://dev.to/dexter766/this-keyword-in-oop-4f2g | devchallenge, cschallenge, computerscience, beginners | _This is a submission for [DEV Computer Science Challenge v24.06.12: One Byte Explainer](https://dev.to/challenges/cs)._
## Explainer
<!-- Explain a computer science concept in 256 characters or less. -->
In a bakery, each baker has their own recipe book. When a baker says "this recipe," they mean a recipe from their own book. Similarly, in programming, `this` refers to the current object's properties and methods, like a baker's personal recipes.
## Additional Context
<!-- Please share any additional context you think the judges should take into consideration as it relates to your One Byte Explainer. -->
In simple terms, think of `this` as a way for an object to say "me" or "myself" to refer to its own data and functions.
* The `this` keyword in object-oriented programming refers to current instance of class.
* In a method, using `this` can help distinguish between class attributes and parameters with the same name.
* It can also be used to pass the current object as a parameter to other methods or constructors.
<!-- Team Submissions: Please pick one member to publish the submission and credit teammates by listing their DEV usernames directly in the body of the post. -->
<!-- Don't forget to add a cover image to your post (if you want). -->
<!-- Thanks for participating! --> | dexter766 |
1,889,241 | OTT App Development Company | Techno Derivation: Pioneering OTT App Development Company In the rapidly evolving digital landscape,... | 0 | 2024-06-15T04:56:32 | https://dev.to/mohit_gupta_e5b0c76bb7ac9/ott-app-development-company-3c0h | Techno Derivation: **[Pioneering OTT App Development](https://technoderivation.com/ott-app-development)** Company
In the rapidly evolving digital landscape, over-the-top (OTT) content has revolutionized how audiences consume media. As a leading OTT app development company, Techno Derivation stands at the forefront of this transformation, offering innovative solutions that cater to the diverse needs of modern entertainment seekers. Our expertise in OTT app development and OTT software development ensures that we deliver top-tier, scalable, and secure applications that enhance user engagement and drive business growth.
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1,872,195 | Boas práticas que fazem a diferença #2 📝 | Esse é o segundo post de uma série sobre boas práticas que eu aprendi durante a minha jornada, tanto... | 27,461 | 2024-06-15T04:55:19 | https://dev.to/superp0sit1on/boas-praticas-que-fazem-a-diferenca-2-gmo | braziliandevs, beginners, programming, productivity | Esse é o segundo post de uma série sobre boas práticas que eu aprendi durante a minha jornada, tanto no trabalho e processos seletivos, quanto na faculdade e projetos pessoais ou de comunidades.
Confira o primeiro post [clicando aqui](https://dev.to/superp0sit1on/pequenas-boas-praticas-que-fazem-a-diferenca-parte-1-24ka).
## Sumário
- [1. Git Flow](#1-git-flow)
- [2. Segredos](#2-segredos)
- [3. Organização de um projeto](#3-organização-de-um-projeto)
## 1. Git Flow
Esse é um assunto um tanto extenso, portanto, vamos tentar resumir os seus principais pontos, mas recomendo fortemente buscar se aprofundar neste tópico posteriormente, assim como todos os outros tópicos dos quais eu lhes apresentei.
**Git Flow** é um modelo de fluxo de trabalho para repositórios **Git**[^1], sendo um grande aliado em projetos de médio ou grande porte, ou mesmo em projetos menores com mais de uma pessoa trabalhando, pois nos ajuda a organizar e padronizar a estrutura do nosso repositório/projeto Git.
Para se adotar o Git Flow, você deve possuir ao menos duas das primeiras branches principais abaixo:
- **`main`**[^2]: branch principal contendo todas as alterações estáveis e previamente aprovadas em outras branches.
- **`develop`**[^2]: branch intermediária onde as alterações são realizadas (normalmente apenas em projetos de pequeno porte) ou mescladas (merge) de outras branches temporárias;
- **`hom`**: branch intermediária com fins de homologação das alterações, antes de enviá-las para a `main`;
- **`stage`**: branch intermediária menos comum, também com fins de homologação, porém, conectada a algum ambiente com configurações similares as do ambiente de produção, por exemplo, em casos de grandes aplicações webs comerciais.
E por fim, as branches temporárias, onde as alterações são normalmente desenvolvidas:
- **`feature/nome-da-feature`**: branches onde são desenvolvidas determinadas features para então serem mescladas a branch `develop`.
- **`fix/nome-da-correção`**: branches onde são desenvolvidas correções para bugs encontrados ou reportados pelas pessoas usuárias.
- **`hotfix/nome-da-correção`**: branches onde são desenvolvidas correções urgentes, das quais normalmente não é possível aguardar todo o fluxo de entrega de uma nova versão.
- **`release/nome-ou-versão-da-release`**: branches onde mesclamos todas as alterações planejadas para uma determinada versão do projeto, normalmente utilizada em conjunto com alguma automação de integração contínua.
Para concluir, no Git Flow nós realizamos os trabalhos nas branches temporárias e depois mesclamos tudo na branch `develop`, opcionalmente mesclando para fins de testes e aprovações nas branches `stage`, `hom`, ou mesmo na própria branch `develop`, e por fim, mesclando na branch `main`, disponibilizando as alterações em produção.
Outro ponto interessante do Git Flow, é que ele nos ajuda a melhor estruturar também nossas ferramentas de **integração contínua (CI)**, porém, não é recomendado para casos de **entrega contínua (CD)**, pois iria gerar a necessidade de branches de longa duração ou mesmo permanente (além das 2 ou 3 principais).
[^1]: É muito comum vermos uma confusão com relação ao Git, GitHub, GitLab, etc. Mas é importante lembrar, que o Git é a ferramenta de versionamento, enquanto o GitHub e afins, são plataformas de hospedagem e gerenciamento seguro em nuvem desses repositórios/projetos Git.
[^2]: Hoje em dia não se utiliza mais do padrão de nomenclaturas `master`, `slave`, entre outras, por conta da sua conotação racista e em apoio ao movimento "Black Lives Matter", começando com o GitHub, e por fim outras empresas adotando o novo padrão pelos mesmos motivos.
## 2. Segredos
_Secrets_ em inglês, são todos os dados sigilosos utilizados nas aplicações que não devem ser publicamente acessíveis, como por exemplo, senhas, chaves de APIs, tokens, etc.
Mas como escondê-los em nossos projetos? Normalmente fazemos uso de variáveis de ambiente (_environment variables_, ou apenas _env vars_) e ferramentas especializadas em gestão e hospedagem segura de segredos como a [AWS Secrets Manager](https://aws.amazon.com/pt/secrets-manager).
Os próprios sistemas operacionais possuem gerenciadores de variáveis de ambiente, mas é comum vermos também a utilização de arquivos como o `.env`[^3] para facilitar a utilização de segredos específicos de projetos:
```env
DB_HOST=172.0.0.1
DB_PORT=5432
DB_USER=admin
DB_PASSWORD=123
```
Muitas tecnologias possuem nativamente funções ou métodos para a leitura e manipulação de variáveis de ambiente, porém, em alguns casos é necessário o uso bibliotecas de terceiros, como era o caso do Node.js, mas hoje a partir da versão 20.6.0, tendo suporte nativo à leitura de arquivos `.env`. Por exemplo, dados o arquivo `.env` acima e o código abaixo:
```javascript
const DB_HOST = process.env.DB_HOST,
DB_PORT = process.env.DB_PORT,
DB_USER = process.env.DB_USER,
DB_PASSWORD = process.env.DB_PASSWORD;
...
```
Bastaria iniciar o nosso projeto com os seguintes argumentos no terminal, para que a aplicação Node.js, executasse carregando os segredos contidos no arquivo `.env`:
```shell
node --env-file=.env nome_do_arquivo.js
```
[^3]: Arquivos que contenham segredos como o `.env`, por sua natureza devem ser incluídos no arquivo `.gitignore` em caso de envio para repositórios remotos, do contrário qualquer pessoa com acesso a esses repositórios teriam acesso a eles, mesmo casos elas não possuíssem autorização para os utilizá-los.
## 3. Organização de um projeto
Como já vimos no [primeiro post](https://dev.to/superp0sit1on/pequenas-boas-praticas-que-fazem-a-diferenca-parte-1-24ka), cada pessoa, tecnologia, time, ou empresa podem possuir padrões/convenções de organização de projetos, pastas, arquivos, etc.
É importante conhecer bem os padrões mais utilizadas na área ou da tecnologia da qual você utiliza, sendo eles normalmente descritos em artigos ou mesmo nas próprias documentações, como por exemplo nas seguintes documentações para projetos [Next.js](https://nextjs.org/docs/getting-started/project-structure) ou [FastAPI](https://fastapi.tiangolo.com/tutorial/bigger-applications).
---
Por hoje é isso, espero que gostem e para qualquer feedback ou discussão construtiva, nos vemos nas redes sociais e aqui nos comentários! 🎉 | superp0sit1on |
1,889,240 | Test title | Test description | 0 | 2024-06-15T04:54:29 | https://dev.to/mesajil/test-title-4h2d | node | Test description | mesajil |
1,409,901 | Micro FrontEnd | O termo Micro Frontend se refere a uma abordagem de desenvolvimento de software que visa quebrar... | 0 | 2023-03-22T02:35:53 | https://dev.to/raynneandrade/micro-frontend-2pd2 | frontend, webdev, devlive, programming | 
O termo Micro Frontend se refere a uma abordagem de desenvolvimento de software que visa quebrar uma aplicação web monolítica em componentes menores e independentes, cada um dos quais é desenvolvido, testado e implantado separadamente. Essa abordagem é semelhante à arquitetura de microserviços no backend, mas se concentra na camada de interface do usuário.
## Para que serve o micro frontend?
A ideia por trás dos Micro Frontends é permitir que equipes de desenvolvimento trabalhem em paralelo em diferentes partes da interface do usuário, sem interferir no trabalho umas das outras. Isso ajuda a melhorar a escalabilidade, a flexibilidade e a eficiência do desenvolvimento.
Para implementar Micro Frontends, é necessário usar uma abordagem de desenvolvimento baseada em componentes. Cada Micro Frontend é um componente independente, que pode ser desenvolvido em uma linguagem diferente ou usando diferentes tecnologias. Esses componentes podem ser implantados em diferentes servidores, executados em diferentes domínios ou até mesmo hospedados em diferentes aplicativos.
Existem várias abordagens para implementar Micro Frontends. Uma abordagem comum é usar uma estrutura de shell, que é um componente que contém a barra de navegação, o cabeçalho, o rodapé e outros elementos comuns da interface do usuário. Os Micro Frontends são então integrados no shell e se comunicam com ele usando uma API. Isso permite que diferentes equipes trabalhem em diferentes partes da interface do usuário e implantem seus componentes de forma independente.
Outra abordagem comum é usar uma abordagem baseada em eventos. Cada Micro Frontend é desenvolvido como um componente independente que pode enviar e receber eventos. Os eventos são usados para comunicar alterações na interface do usuário ou em outras partes do sistema. Isso permite que diferentes equipes trabalhem em diferentes partes da interface do usuário sem precisar se preocupar com a integração com outros componentes.
Os Micro Frontends podem trazer vários benefícios para a arquitetura da aplicação. Eles permitem que as equipes de desenvolvimento trabalhem de forma mais independente e possam iterar com mais rapidez. Eles também permitem que diferentes partes da interface do usuário sejam desenvolvidas com tecnologias diferentes, o que pode ser útil para equipes com diferentes especializações ou habilidades.
No entanto, existem alguns desafios associados ao uso de Micro Frontends. Uma preocupação comum é a complexidade da arquitetura, que pode se tornar difícil de gerenciar à medida que mais e mais componentes são adicionados à aplicação. Também pode ser desafiador manter uma experiência do usuário consistente em toda a aplicação, especialmente se diferentes equipes estão trabalhando em diferentes partes da interface do usuário.
Em resumo, os Micro Frontends são uma abordagem de desenvolvimento de software que permite que diferentes partes da interface do usuário sejam desenvolvidas e implantadas de forma independente. Embora existam desafios associados ao uso de Micro Frontends, eles podem trazer vários benefícios para a arquitetura da aplicação e para o processo de desenvolvimento de software em geral. | raynneandrade |
1,889,235 | The Power of Embeddings in AI | Introduction Embeddings have become a cornerstone in natural language processing (NLP)... | 27,673 | 2024-06-15T04:45:07 | https://dev.to/rapidinnovation/the-power-of-embeddings-in-ai-3f9h | ## Introduction
Embeddings have become a cornerstone in natural language processing (NLP) and
machine learning. They transform words, phrases, or documents into vectors of
real numbers, allowing algorithms to effectively interpret and process natural
language data.
## What are Embeddings?
Embeddings are data representations that highlight relationships and
similarities between data points. They are low-dimensional, continuous vector
spaces where similar data points are mapped close to each other, making them
useful in NLP and computer vision.
## Types of Embeddings
There are several types of embeddings, each designed for specific
applications:
## Storage of Embeddings
Efficient storage of embeddings is crucial for performance and scalability.
Options include on-disk storage, in-memory storage, and cloud storage
solutions, each with its own advantages and trade-offs.
## Applications of Embeddings
Embeddings are widely used in various applications:
## Embeddings in Large Language Models (LLMs)
In LLMs like GPT-3 and BERT, embeddings play a crucial role in understanding
and generating human-like text. They reduce the complexity of language data,
enabling models to process large volumes of text efficiently.
## Benefits of Using Embeddings
Embeddings offer numerous benefits, including improved model performance,
efficiency in handling large datasets, and versatility across different
applications.
## Challenges with Embeddings
Despite their advantages, embeddings come with challenges such as
dimensionality issues, storage and computational costs, and bias and fairness
concerns.
## Future of Embeddings
The future of embeddings looks promising with advancements in embedding
technologies and their integration with emerging AI technologies, leading to
more dynamic and context-aware systems.
## Real-World Examples
Examples of embeddings in action include the use of Word2Vec in e-commerce for
personalized recommendations and graph embeddings in social network analysis
for tasks like node classification and link prediction.
## Conclusion
Embeddings are a pivotal component in modern AI applications, bridging the gap
between human-like understanding and machine processing capabilities. Their
strategic importance lies in enhancing the intelligence and applicability of
AI systems across various sectors.
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1,889,233 | Day 1 Coding Challenge: Mastering String Reversal in JavaScript and Python | Welcome to Day 1 of our daily coding challenge series! Today, we'll tackle an essential programming... | 0 | 2024-06-15T04:42:27 | https://dev.to/dipakahirav/day-1-coding-challenge-mastering-string-reversal-in-javascript-and-python-1m0g | javascript, python, coding, challenge | Welcome to Day 1 of our daily coding challenge series! Today, we'll tackle an essential programming task: reversing a string. Whether you're coding in JavaScript or Python, this challenge will help you sharpen your skills and enhance your understanding of string manipulation. Let's dive in and solve this problem together!
please subscribe to my [YouTube channel](https://www.youtube.com/@DevDivewithDipak?sub_confirmation=1
) to support my channel and get more web development tutorials.
#### Introduction:
Welcome to our daily coding challenge series! Today marks the beginning of an exciting journey where we'll solve various programming problems to improve our coding skills. Each day, we'll present a new challenge and provide efficient solutions in both JavaScript and Python. Let's get started with Day 1!
#### Problem:
**Title:** Reverse a String
**Description:**
Write a function that takes a string as input and returns the string reversed. This problem is fundamental in understanding string manipulation and will help build a solid foundation for more complex tasks.
**Example:**
```
Input: "hello"
Output: "olleh"
```
**Constraints:**
- The input string will consist of printable ASCII characters.
- Do not use the built-in `reverse()` method.
#### Solution in Python:
Here’s an efficient way to reverse a string using slicing in Python:
```python
def reverse_string(s: str) -> str:
return s[::-1]
# Test the function
input_str = "hello"
print(reverse_string(input_str)) # Output: "olleh"
```
**Explanation:**
1. The function `reverse_string` takes a string `s` as input.
2. The slicing notation `s[::-1]` is used to reverse the string. It means "start at the end of the string and end at position 0, move with the step -1" which effectively reverses the string.
3. The reversed string is returned.
#### Solution in JavaScript:
For JavaScript, we can reverse a string by converting it to an array, using the `reverse()` method, and then converting it back to a string:
```javascript
function reverseString(str) {
return str.split('').reverse().join('');
}
// Test the function
let inputStr = "hello";
console.log(reverseString(inputStr)); // Output: "olleh"
```
**Explanation:**
1. The function `reverseString` takes a string `str` as input.
2. The `split('')` method converts the string into an array of characters.
3. The `reverse()` method reverses the order of elements in the array.
4. The `join('')` method joins the elements of the array back into a single string.
5. The reversed string is returned.
#### Your Task:
Try solving this problem on your own. Once you have a solution, share it in the comments below or tag me in your post with #CodingChallengeDay1. Feel free to discuss different approaches and optimizations!
#### Conclusion:
Stay tuned for tomorrow's challenge as we continue to build our problem-solving skills. Happy coding!
---
By participating in these challenges, you'll not only improve your coding abilities but also prepare yourself for coding interviews and real-world problem-solving. Let's learn and grow together!
Feel free to leave your comments or questions below. If you found this guide helpful, please share it with your peers and follow me for more web development tutorials. Happy coding!
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1,889,220 | emacs org感觉挺好的 | 我看网上别人一直喜欢吹emacs的org文档编辑，我原以为就是和markdown一样的东西，本来就会。 最近不再使用jetbrains系列的软件，感觉就jupyter的插件比较好用，现在用vscode的... | 0 | 2024-06-15T04:37:41 | https://dev.to/xiaodao/emacs-orggan-jue-ting-hao-de-5f50 | 我看网上别人一直喜欢吹emacs的org文档编辑，我原以为就是和markdown一样的东西，本来就会。
最近不再使用jetbrains系列的软件，感觉就jupyter的插件比较好用，现在用vscode的替代，一直尝试用用emacs里面的ein插件，发现这个有bug，已经好久不修复了。
vscode的jupyter的可能是插件安装太多了，有时候死机，只有强制退出才能搞其他的。
我平时写代码主要还是emacs，这个代码搜索，编辑还是emacs最强。
折腾emacs感觉永远都有学习的，所以我又没事学了下org，才发现org其实可以实现jupyter差不多的功能，其实我对jupyter的使用要求不高，就是有时候执行命令，然后把结果记录下来。
看来vscode的ipynb可以不用了，emacs可以跑全套了。 | xiaodao | |
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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" | xivok85011 |
1,889,218 | How to Deploy Your Backend on Vercel Using `vercel.json`: A Step-by-Step Guide | Deploying a backend server can often be a complex process, but with Vercel, it becomes... | 0 | 2024-06-15T04:32:04 | https://dev.to/vyan/how-to-deploy-your-backend-on-vercel-using-verceljson-a-step-by-step-guide-5a78 | webdev, node, vercel, beginners | Deploying a backend server can often be a complex process, but with Vercel, it becomes straightforward and efficient. Vercel, a popular platform for frontend and backend deployment, allows developers to easily deploy their applications with minimal configuration. In this blog, we will walk you through the steps to deploy a backend server on Vercel using the `vercel.json` configuration file, ensuring your application is live and accessible in no time.
## Introduction to Vercel
Vercel is a cloud platform designed to host static sites, serverless functions, and full-stack applications. It offers seamless integration with GitHub, GitLab, and Bitbucket, allowing you to deploy your projects directly from your repository. With Vercel, you can benefit from automatic scaling, fast global CDN, and zero configuration deployments, making it an ideal choice for modern web applications.
## Prerequisites
Before we start, ensure you have the following:
1. A Vercel account. You can sign up at [Vercel](https://vercel.com/signup).
2. A GitHub, GitLab, or Bitbucket account with a repository containing your backend code.
3. Node.js installed on your local machine.
## Step-by-Step Guide to Deploying Your Backend on Vercel
### Step 1: Prepare Your Backend
Ensure your backend is ready for deployment. If you're using Node.js, your project should have a `package.json` file with the necessary dependencies and scripts.
Example `package.json`:
```json
{
"name": "my-backend",
"version": "1.0.0",
"main": "index.js",
"scripts": {
"start": "node index.js"
},
"dependencies": {
"express": "^4.17.1"
}
}
```
### Step 2: Create `vercel.json` Configuration File
The `vercel.json` file allows you to specify configuration for your deployment. Create a `vercel.json` file in the root directory of your project with the following content:
```json
{
"version": 2,
"builds": [
{
"src": "index.js",
"use": "@vercel/node"
}
],
"routes": [
{
"src": "/(.*)",
"dest": "index.js"
}
]
}
```
### Step 3: Organize Your Backend Code
Ensure your backend code is properly structured. For this example, we'll place serverless functions in the `api` directory.
```
my-backend/
├── api/
│ └── hello.js
├── index.js
├── package.json
└── vercel.json
```
Example `api/hello.js`:
```javascript
module.exports = (req, res) => {
res.status(200).json({ message: "Hello from the backend!" });
};
```
### Step 4: Push Code to GitHub
Commit your code to a GitHub repository. You can do this by initializing a git repository in your project folder, adding your files, and pushing them to GitHub.
```bash
git init
git add .
git commit -m "Initial commit"
git branch -M main
git remote add origin <your-repo-url>
git push -u origin main
```
### Step 5: Go to Vercel Dashboard
Navigate to the [Vercel Dashboard](https://vercel.com/dashboard) and log in with your account.
### Step 6: Add New Project and Import Repository
In the Vercel dashboard, click on "New Project" and select the option to import a project from your Git repository (GitHub, GitLab, or Bitbucket).
### Step 7: Select the Backend Directory
During the setup process, ensure you select the root directory of your backend project (where your `vercel.json` file is located).
### Step 8: Deploy the Project
Click "Deploy" to start the deployment process. Vercel will build and deploy your project based on the configuration specified in your `vercel.json` file.
### Step 9: Access Your Deployed Backend
After deployment, Vercel will provide you with a URL where your backend is hosted. You can access your API endpoints by appending the API path to this URL.
For example, if your project URL is `https://my-backend.vercel.app`, you can access the `hello` endpoint at `https://my-backend.vercel.app/api/hello`.
## Conclusion
Deploying a backend on Vercel using the `vercel.json` configuration file is a streamlined process that allows developers to focus on writing code rather than managing infrastructure. With Vercel’s powerful features, you can deploy and scale your backend effortlessly. Whether you’re working on a small project or a large-scale application, Vercel provides the tools and services to ensure your backend is robust and responsive.
Start deploying your backend on Vercel today and experience the benefits of modern deployment practices! | vyan |
1,889,213 | 🧙♂️ 10 Magical Tips Every Programmer Should Know from "97 Things Every Programmer Should Know" 🧙♀️ | Hey there, code wizards and tech sorcerers! 🧑💻 Ready to level up your programming game? We’ve... | 0 | 2024-06-15T04:22:57 | https://dev.to/kalyani_borkar_87ce4bb608/10-magical-tips-every-programmer-should-know-from-97-things-every-programmer-should-know-5786 | ****
Hey there, code wizards and tech sorcerers! 🧑💻 Ready to level up your programming game? We’ve cracked open the treasure chest that is "97 Things Every Programmer Should Know" by Kevlin Henney and pulled out ten sparkling gems of wisdom just for you. Get ready to sprinkle some magic dust on your code with these enchanting tips! ✨
**1. 🧹 The Boy Scout Rule** : "Leave No Mess Behind"
Uncle Bob (aka Robert C. Martin) has a rule as simple as tying your shoelaces: always leave the code cleaner than you found it. Think of it as tidying your room—except it's your codebase! 👌
**2. 💖 Care About Your Craft :** "Code Like an Artist"
Michael Feathers wants you to be a code artist. 🎨 It's not just about getting the job done; it's about writing code so beautiful, you'd want to frame it and hang it on your wall.
**3. 🔄 Design Is a Process, Not a Document** : "Evolve Your Code, Evolve Your Design"
David Heinemeier Hansson (the guy who made Ruby on Rails) drops this bombshell: design should evolve with your code. It's like a Pokémon—it grows, it adapts, and sometimes it even evolves into something awesome! 🦄
**4. 🔌 Decoupling Patterns** : "Keep Your Code Cats Independent"
Ralf Westphal's advice is to keep your code modules as independent as cats in a neighborhood. 🐈 They should do their own thing without bothering each other, making your life as a coder much easier.
**5. 🕵️♂️ Test Early, Test Often, Test Automatically** : "Be a Bug Detective"
Gerard Meszaros is like your coding detective. 🕵️♂️ Test your code early, test it often, and automate those tests so you can catch bugs before they become code criminals.
**6. 🤖 Automate Your Coding Standard** : "Let Robots Handle the Boring Stuff"
Filip van Laenen wants you to use robots (okay, automated tools) to enforce your coding standards. 🤖 Consistency is key, and these tools are your trusty sidekicks!
**7. 👯 Pair Programming** : "Two Heads, One Keyboard"
Dave Thomas, co-author of "The Pragmatic Programmer," says two heads are better than one. Pair programming is like a buddy cop movie where you and your partner write kickass code together. 🎬👯♂️
**8. 📝 Treat English as a First-Class Language** : "Talk to Your Code"
Damian Conway wants your code to communicate as clearly as a friendly neighbor. 🗣️ Good comments and documentation are like good manners—they make everyone’s life easier.
**9. 📚 Read the Humanities** : "Expand Your Mind, Expand Your Code"
Diomidis Spinellis suggests taking a break from coding to read some philosophy, history, or even a novel. 📖 It makes you a better thinker and, believe it or not, a better coder. Plus, you can drop fancy quotes in meetings.
**10. 🌍 Learn to Say 'Hello, World!'** : "Keep Learning, Keep Growing"
Dave Thomas encourages you to keep learning new programming languages and paradigms. 🌍 It’s like traveling the world from your keyboard—new experiences, new perspectives, and maybe even a new favorite syntax!
🧐 Questions, Comments, Magical Spells?
Got your own spellbook of coding tips? Or questions about these? Drop a comment below! Let's brew up some knowledge together! 🧙♂️🧙♀️
Ready to add some magic to your coding? Share these tips with your fellow wizards and let the enchantment begin! ✨🔮
#cleancode #softwareEngineering | kalyani_borkar_87ce4bb608 | |
1,889,232 | Create a Fast Node.js Serverless Backend Using AWS Lambda and DynamoDB | Build a fast Node.js serverless backend with AWS Lambda and DynamoDB. Learn to set up, secure, and... | 0 | 2024-06-15T04:44:33 | https://blog.wilsonkomlan.com/create-a-fast-nodejs-serverless-backend-using-aws-lambda-and-dynamodb | lambda, aws, awslambda, dynamodb | ---
title: Create a Fast Node.js Serverless Backend Using AWS Lambda and DynamoDB
published: true
date: 2024-06-15 04:22:07 UTC
tags: lambda,AWS,awslambda,DynamoDB
canonical_url: https://blog.wilsonkomlan.com/create-a-fast-nodejs-serverless-backend-using-aws-lambda-and-dynamodb
---
Build a fast Node.js serverless backend with AWS Lambda and DynamoDB. Learn to set up, secure, and perform CRUD operations efficiently | komlanwilson |
1,889,215 | HOME PODIUM | Home Podium is a comprehensive platform designed to revolutionize property management for landlords,... | 0 | 2024-06-15T04:21:27 | https://dev.to/homepodium/home-podium-3hdi | Home Podium is a comprehensive platform designed to revolutionize property management for landlords, property management companies, and tenants alike.
[https://homepodium.com/](https://homepodium.com/) | homepodium | |
1,889,204 | Creating a Character Device Driver for Raspberry Pi Using Buildroot | Introduction Welcome to those who have read my previous posts, and a warm welcome to all... | 0 | 2024-06-15T04:16:15 | https://dev.to/devdoesit17/creating-a-character-device-driver-for-raspberry-pi-using-buildroot-2i9a | embedded, linux, cpp | #### Introduction
Welcome to those who have read my previous posts, and a warm welcome to all who are new to my blog. As an embedded developer, I continue to navigate the complexities of learning embedded engineering. Imposter syndrome often makes me wonder if I truly grasp the concepts as well as my peers. I am committed to gaining more knowledge in order to overcome numerous challenges that may arise in the embedded world. In this article, I will introduce you to the world of character device drivers, understand their core concepts, and walk you through the steps of creating and building one for a Raspberry Pi using Buildroot.
## Understanding Character Device Drivers
### What is a Character Device Driver?
Character device drivers are a type of device driver that manage devices performing I/O operations sequentially. Character devices, on the other hand, deal with data streams, making them compatible with a variety of peripherals, like serial ports, keyboards, and custom hardware.
### Key Concepts
1. **Device Files**: In Linux, character devices are represented by device files located in the `/dev` directory. These files provide an interface for user-space applications to interact with the hardware.
2. **Major and Minor Numbers**: Each device file contains both a [Major and Minor Number](https://www.oreilly.com/library/view/linux-device-drivers/0596000081/ch03s02.html). The major number identifies the driver associated with the device, while the minor number identifies the specific device handled by the driver.
3. **File Operations**: Character device drivers define a set of file operations, such as `open`, `close`, `read`, `write`, and `ioctl`, to handle interactions between the user-space and the hardware.
## Creating a Character Device Driver
### Prerequisites
Before you embark on your development adventure, make sure you have the basic setup below:
- A Linux development environment (preferably Ubuntu or similar).
- Basic knowledge of C programming and Linux kernel modules.
- Root access to the system for module loading and device file creation.
- A Raspberry Pi board.
- Buildroot configured for the Raspberry Pi.
### Step 1: Setting Up Buildroot for Raspberry Pi
First, download and configure Buildroot for your Raspberry Pi as described in the [previous article](https://dev.to/devdoesit17/build-a-simple-linux-kernel-using-buildroot-4d29) excluding the building step for the moment.
### Step 2: Writing the Driver Code
Create a directory within your Buildroot package directory for your driver code:
```sh
mkdir -p buildroot/package/simple_char_driver
cd buildroot/package/simple_char_driver
touch char_driver.c
```
Open `char_driver.c` in your preferred text editor:
```c
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/uaccess.h>
#define DEVICE_NAME "char_device"
#define BUFFER_SIZE 1024
#define CHAR_DEBUG_PRINT(fmt, ...) printk(KERN_INFO "CHAR_DRIVER_INFO: " fmt, ##__VA_ARGS__)
static int major_number;
static char device_buffer[BUFFER_SIZE];
static int open_count = 0;
static int device_open(struct inode *inode, struct file *file) {
open_count++;
CHAR_DEBUG_PRINT("Device opened %d times\n", open_count);
return 0;
}
static int device_release(struct inode *inode, struct file *file) {
CHAR_DEBUG_PRINT("Device closed\n");
return 0;
}
static ssize_t device_read(struct file *file, char __user *user_buffer, size_t size, loff_t *offset) {
int bytes_read = size < BUFFER_SIZE ? size : BUFFER_SIZE;
if (copy_to_user(user_buffer, device_buffer, bytes_read)) {
return -EFAULT;
}
return bytes_read;
}
static ssize_t device_write(struct file *file, const char __user *user_buffer, size_t size, loff_t *offset) {
int bytes_to_write = size < BUFFER_SIZE ? size : BUFFER_SIZE;
if (copy_from_user(device_buffer, user_buffer, bytes_to_write)) {
return -EFAULT;
}
return bytes_to_write;
}
static struct file_operations fops = {
.open = device_open,
.release = device_release,
.read = device_read,
.write = device_write,
};
static int __init char_device_init(void) {
major_number = register_chrdev(0, DEVICE_NAME, &fops);
if (major_number < 0) {
CHAR_DEBUG_PRINT("Failed to register a major number\n");
return major_number;
}
CHAR_DEBUG_PRINT("Registered with major number %d\n", major_number);
return 0;
}
static void __exit char_device_exit(void) {
unregister_chrdev(major_number, DEVICE_NAME);
CHAR_DEBUG_PRINT("Unregistered device\n");
}
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Dev Reid");
MODULE_DESCRIPTION("A simple character device driver");
MODULE_VERSION("0.1");
module_init(char_device_init);
module_exit(char_device_exit);
```
### Step 3: Integrating the Driver with Buildroot
Create a `Config.in` file in the `simple_char_driver` directory:
```sh
touch Config.in
```
Edit `Config.in`:
```sh
config BR2_PACKAGE_SIMPLE_CHAR_DRIVER
bool "Simple Character Device Driver"
help
This is a simple character device driver example for my raspberry pi 4.
```
Create a `simple_char_driver.mk` file in the same directory:
```sh
touch simple_char_driver.mk
```
Edit `simple_char_driver.mk`:
```makefile
################################################################################
# Simple Character Device Driver Buildroot Package Makefile
################################################################################
# Define package variables
SIMPLE_CHAR_DRIVER_VERSION = 0.1
SIMPLE_CHAR_DRIVER_SITE = $(TOPDIR)/package/simple_char_driver
SIMPLE_CHAR_DRIVER_SITE_METHOD = local
SIMPLE_CHAR_DRIVER_LICENSE = GPL-2.0+
SIMPLE_CHAR_DRIVER_LICENSE_FILES = char_driver.c
# Path to the Buildroot cross-compiler
CROSS_COMPILE := $(TOPDIR)/output/host/usr/bin/arm-buildroot-linux-gnueabihf-
# Define build commands
define SIMPLE_CHAR_DRIVER_BUILD_CMDS
$(MAKE) -C $(LINUX_DIR) M=$(SIMPLE_CHAR_DRIVER_BUILD_DIR) ARCH=arm CROSS_COMPILE=$(CROSS_COMPILE)
endef
# Define install commands
define SIMPLE_CHAR_DRIVER_INSTALL_TARGET_CMDS
$(INSTALL) -D -m 0755 $(SIMPLE_CHAR_DRIVER_BUILD_DIR)/char_driver.ko $(TARGET_DIR)/lib/modules/char_driver.ko
endef
# Define clean commands
define SIMPLE_CHAR_DRIVER_CLEAN_CMDS
$(MAKE) -C $(LINUX_DIR) M=$(SIMPLE_CHAR_DRIVER_BUILD_DIR) ARCH=arm CROSS_COMPILE=$(CROSS_COMPILE) clean
endef
# Set directory variables
SIMPLE_CHAR_DRIVER_BUILD_DIR := $(BUILD_DIR)/simple_char_driver-$(SIMPLE_CHAR_DRIVER_VERSION)
# Evaluate kernel module and generic package rules
$(eval $(kernel-module))
$(eval $(generic-package))
```
Create a `Makefile` file in the same directory:
```sh
touch Makefile
```
Edit `Makefile`:
```makefile
obj-m += char_driver.o
# Path to the kernel source
KERNELDIR := $(SIMPLE_CHAR_DRIVER_SITE)
# Compilation flags
ccflags-y := -DDEBUG -g -std=gnu99 -Wno-declaration-after-statement
.PHONY: all clean
all:
$(MAKE) -C $(SIMPLE_CHAR_DRIVER_SITE) M=$(PWD) modules
clean:
$(MAKE) -C $(SIMPLE_CHAR_DRIVER_SITE) M=$(PWD) clean
```
Add the package to Buildroot's `package/Config.in`:
```sh
cd ..
echo "source \"package/char_device_driver/Config.in\"" >> Config.in
```
### Step 4: Building the Driver with Buildroot
Reconfigure Buildroot to include your driver:
```sh
cd ..
make menuconfig
```
Navigate to:
- `Simple Device Driver` and enable it.
Build the Buildroot system:
```sh
make
```
After two hours later...
Verify that the kernel module file (`char_driver.ko`) was added to the rootfs. There are two methods to verify this, and they should have the same output:
1. This can be done by check the current folder `output/target/lib/modules`.
2. Or you can mount the `rootfs.ext4`:
```sh
sudo mount -o loop output/images/rootfs.ext4 /mnt
```
Check the `lib/modules` folder
### Step 5: Running the Driver on Raspberry Pi
1. **Flash the Buildroot image** to your SD card and boot your Raspberry Pi with it.
2. **Load the driver module**:
```sh
insmod /lib/modules/$(uname -r)/char_driver.ko
```
3. **Create the device file**:
```sh
mknod /dev/char_device c <major_number> 0
chmod 666 /dev/char_device
```
Replace `<major_number>` with the major number from the kernel log. To read the logs from the module, use the following command:
```sh
dmesg | grep char_device
```
4. **Test the driver**:
```sh
echo "Hello, Device!" > /dev/char_device
cat /dev/char_device
```
### Step 6: Unloading the Driver
When you're done, unload the driver:
```sh
rmmod char_driver
```
Remove the device file:
```sh
rm /dev/char_device
```
## Conclusion
Understanding the core concepts of device files, major and minor numbers, and file operations is important for creating a character device driver for Raspberry Pi using Buildroot. You can build and test a character device driver on your Raspberry Pi by following the instructions in this article. This fundamental understanding paves the way for more intricate driver development and deeper interactions with hardware components in embedded systems.
### SOLI DEO GLORIA
Helpful Articles:
[Writing and Inserting a 'Hello World' Kernel Module for the Beaglebone Black (Buildroot)](https://blog.billvanleeuwen.ca/writing-and-inserting-a-hello-world-kernel-module-for-the-beaglebone-black-buildroot) | devdoesit17 |
1,889,203 | Mastering Form Handling with Custom Hooks in React | Handling forms in React can be challenging, especially as forms grow in complexity. Custom hooks... | 0 | 2024-06-15T04:12:36 | https://dev.to/hasancse/mastering-form-handling-with-custom-hooks-in-react-h02 | webdev, typescript, programming, react | Handling forms in React can be challenging, especially as forms grow in complexity. Custom hooks provide an elegant solution to manage form state, validation, and submission logic, making your code cleaner and more maintainable. In this blog post, we'll explore how to create custom hooks for form handling in React using TypeScript.
**Table of Contents**
1. Introduction to Form Handling in React
2. Creating a Basic useForm Hook with TypeScript
3. Adding Validation Logic
4. Managing Form Submission
5. Handling Form Reset
6. Integrating with External Libraries
7. Advanced Form Handling Techniques
8. Best Practices for Form Handling Hooks
9. Example: Building a Complete Form
10. Conclusion
## 1. Introduction to Form Handling in React
Forms are essential in web applications for user interaction, but managing form state and validation can quickly become cumbersome. React's controlled components approach, where form elements derive their values from state, helps keep form state predictable. Custom hooks allow us to abstract and reuse form logic efficiently.
## 2. Creating a Basic useForm Hook
Let's start by creating a simple useForm hook to manage form state.
```
import { useState } from 'react';
type FormValues = {
[key: string]: any;
};
function useForm<T extends FormValues>(initialValues: T) {
const [values, setValues] = useState<T>(initialValues);
const handleChange = (event: React.ChangeEvent<HTMLInputElement>) => {
const { name, value } = event.target;
setValues({
...values,
[name]: value,
});
};
return {
values,
handleChange,
};
}
export default useForm;
```
This hook initializes form values and provides a handleChange function to update the state.
## 3. Adding Validation Logic
Next, let's add validation logic to our useForm hook. We'll accept a validate function as a parameter and manage validation errors.
```
import { useState } from 'react';
type FormValues = {
[key: string]: any;
};
type Errors<T> = {
[K in keyof T]?: string;
};
function useForm<T extends FormValues>(
initialValues: T,
validate: (name: keyof T, value: T[keyof T]) => string | undefined
) {
const [values, setValues] = useState<T>(initialValues);
const [errors, setErrors] = useState<Errors<T>>({});
const handleChange = (event: React.ChangeEvent<HTMLInputElement>) => {
const { name, value } = event.target;
setValues({
...values,
[name]: value,
});
if (validate) {
setErrors({
...errors,
[name]: validate(name as keyof T, value),
});
}
};
return {
values,
errors,
handleChange,
};
}
export default useForm;
```
This hook now tracks errors and updates them based on the validation logic provided.
## 4. Managing Form Submission
Now, we'll add a handleSubmit function to handle form submission.
```
import { useState } from 'react';
type FormValues = {
[key: string]: any;
};
type Errors<T> = {
[K in keyof T]?: string;
};
function useForm<T extends FormValues>(
initialValues: T,
validate: (name: keyof T, value: T[keyof T]) => string | undefined,
onSubmit: (values: T) => void
) {
const [values, setValues] = useState<T>(initialValues);
const [errors, setErrors] = useState<Errors<T>>({});
const handleChange = (event: React.ChangeEvent<HTMLInputElement>) => {
const { name, value } = event.target;
setValues({
...values,
[name]: value,
});
if (validate) {
setErrors({
...errors,
[name]: validate(name as keyof T, value),
});
}
};
const handleSubmit = (event: React.FormEvent<HTMLFormElement>) => {
event.preventDefault();
const validationErrors: Errors<T> = {};
for (const key in values) {
const error = validate(key as keyof T, values[key]);
if (error) {
validationErrors[key as keyof T] = error;
}
}
setErrors(validationErrors);
if (Object.keys(validationErrors).length === 0) {
onSubmit(values);
}
};
return {
values,
errors,
handleChange,
handleSubmit,
};
}
export default useForm;
```
The handleSubmit function prevents the default form submission, validates all fields, and calls the onSubmit function if there are no errors.
## 5. Handling Form Reset
We can also add a resetForm function to reset the form to its initial state.
```
import { useState } from 'react';
type FormValues = {
[key: string]: any;
};
type Errors<T> = {
[K in keyof T]?: string;
};
function useForm<T extends FormValues>(
initialValues: T,
validate: (name: keyof T, value: T[keyof T]) => string | undefined,
onSubmit: (values: T) => void
) {
const [values, setValues] = useState<T>(initialValues);
const [errors, setErrors] = useState<Errors<T>>({});
const handleChange = (event: React.ChangeEvent<HTMLInputElement>) => {
const { name, value } = event.target;
setValues({
...values,
[name]: value,
});
if (validate) {
setErrors({
...errors,
[name]: validate(name as keyof T, value),
});
}
};
const handleSubmit = (event: React.FormEvent<HTMLFormElement>) => {
event.preventDefault();
const validationErrors: Errors<T> = {};
for (const key in values) {
const error = validate(key as keyof T, values[key]);
if (error) {
validationErrors[key as keyof T] = error;
}
}
setErrors(validationErrors);
if (Object.keys(validationErrors).length === 0) {
onSubmit(values);
}
};
const resetForm = () => {
setValues(initialValues);
setErrors({});
};
return {
values,
errors,
handleChange,
handleSubmit,
resetForm,
};
}
export default useForm;
```
## 6. Integrating with External Libraries
Our custom hook can be easily integrated with external libraries like Yup for validation.
```
import * as Yup from 'yup';
const validationSchema = Yup.object().shape({
username: Yup.string().required('Username is required'),
email: Yup.string().email('Invalid email address').required('Email is required'),
});
function validate(name: string, value: any) {
try {
validationSchema.validateSyncAt(name, { [name]: value });
return '';
} catch (error) {
return error.message;
}
}
```
## 7. Advanced Form Handling Techniques
Custom hooks can also handle more complex scenarios, such as dynamic forms, dependent fields, and multi-step forms. These advanced techniques involve managing more intricate state and logic within your hooks.
## 8. Best Practices for Form Handling Hooks
Keep It Simple: Start with basic functionality and extend as needed.
Separate Concerns: Handle validation, submission, and state management in distinct functions if they become too complex.
Reusability: Make sure your custom hooks are reusable across different forms.
Type Safety: Utilize TypeScript to ensure your custom hooks and form components are type-safe.
Testing: Write tests for your custom hooks to ensure they work as expected.
## 9. Example: Building a Complete Form
Here's how to use our custom useForm hook to build a complete form.
```
import React from 'react';
import useForm from './useForm';
const validate = (name: string, value: any) => {
if (!value) return `${name} is required`;
return '';
};
const onSubmit = (values: { username: string; email: string }) => {
console.log('Form Submitted:', values);
};
const App: React.FC = () => {
const { values, errors, handleChange, handleSubmit, resetForm } = useForm(
{ username: '', email: '' },
validate,
onSubmit
);
return (
<form onSubmit={handleSubmit}>
<div>
<label>
Username:
<input type="text" name="username" value={values.username} onChange={handleChange} />
{errors.username && <span>{errors.username}</span>}
</label>
</div>
<div>
<label>
Email:
<input type="email" name="email" value={values.email} onChange={handleChange} />
{errors.email && <span>{errors.email}</span>}
</label>
</div>
<button type="submit">Submit</button>
<button type="button" onClick={resetForm}>Reset</button>
</form>
);
};
export default App;
```
## 10. Conclusion
Custom hooks in React provide a powerful way to manage form state, validation, and submission logic. By encapsulating this logic within hooks, you can create reusable and maintainable form components. Start with the basics, and gradually add more functionality as needed.
| hasancse |
1,889,054 | Design patterns: Part One - A brief explanation of creational pattern | The picture was taken from boredpanda. Hello everyone! Starting my first post with one of... | 0 | 2024-06-15T03:59:33 | https://dev.to/andres_paladines/design-patterns-part-one-a-brief-explanation-of-creational-pattern-5507 | architecture, designpatterns, javascript, swift | The picture was taken from [boredpanda](https://www.boredpanda.com/digital-art-cats-brutalist-architecture-cats-of-brutalism/).
### Hello everyone!
Starting my first post with one of the most basic but never unnecessary topics; Design patterns.
Let's start listing them:
```
.
├── Creational Patterns
│ ├── Singleton
│ ├── Factory Method
│ ├── Builder
│ ├── Abstract Factory
│ ├── Prototype
├── Structural Patterns
│ ├── Adapter
│ ├── Decorator
│ ├── Facade
│ ├── Composite
│ ├── Proxy
├── Behavioral Patterns
│ ├── Observer
│ ├── Strategy
│ ├── Command
│ ├── Chain of Responsibility
│ ├── Mediator
│ ├── State
│ ├── Template Method
.
```
# Creational Patterns
This post will focus on `Creational Patterns` and how to construct them with swift and javascript. So, Let's start!
## Singleton
Ensures a class has only one instance and provides a global point of access to it.
**Use case:** A central configuration manager for app settings.
#### Swift:
```swift
class ConfigurationManager {
static let shared = ConfigurationManager()
private init() { }
var settings: [String: Any] = [:]
func updateSetting(key: String, value: Any) {
settings[key] = value
}
func getSetting(key: String) -> Any? {
return settings[key]
}
}
// Usage
ConfigurationManager.shared.updateSetting(key: "theme", value: "dark")
let theme = ConfigurationManager.shared.getSetting(key: "theme")
```
#### JavaScript:
```javascript
class ConfigurationManager {
constructor() {
if (ConfigurationManager.instance == null) {
this.settings = {};
ConfigurationManager.instance = this;
}
return ConfigurationManager.instance;
}
updateSetting(key, value) {
this.settings[key] = value;
}
getSetting(key) {
return this.settings[key];
}
}
const instance = new ConfigurationManager();
Object.freeze(instance);
// Usage
instance.updateSetting("theme", "dark");
const theme = instance.getSetting("theme");
```
## Factory Method
Defines an interface for creating different objects from a superclass or protocol from another object.
**Use Case:** Handling different types of payment gateways (e.g., PayPal, Stripe, Apple Pay).
#### Swift:
```swift
enum PaymentProvider {
case paypal
case stripe
}
protocol PaymentGateway {
func processPayment(amount: Double)
}
class PayPal: PaymentGateway {
func processPayment(amount: Double) {
print("Processing payment through PayPal: \(amount)")
}
}
class Stripe: PaymentGateway {
func processPayment(amount: Double) {
print("Processing payment through Stripe: \(amount)")
}
}
class PaymentGatewayFactory {
static func createPaymentGateway(type: PaymentProvider) -> PaymentGateway? {
switch type {
case .paypal:
return PayPal()
case .stripe:
return Stripe()
default:
return nil
}
}
}
// Usage
let gateway = PaymentGatewayFactory.createPaymentGateway(type: "PayPal")
gateway?.processPayment(amount: 100.0)
```
#### JavaScript:
```javascript
class PayPal {
processPayment(amount) {
console.log(`Processing payment through PayPal: ${amount}`);
}
}
class Stripe {
processPayment(amount) {
console.log(`Processing payment through Stripe: ${amount}`);
}
}
class PaymentGatewayFactory {
static createPaymentGateway(type) {
switch (type) {
case "PayPal":
return new PayPal();
case "Stripe":
return new Stripe();
default:
return null;
}
}
}
// Usage
const gateway = PaymentGatewayFactory.createPaymentGateway("PayPal");
gateway.processPayment(100.0);
```
## Builder
Separates the whole construction process of a complex object, allowing to create different representations of it.
**Use Case:** Creating complex UI components such as custom dialog boxes.
### Swift
```swift
class Dialog {
var title: String = ""
var message: String = ""
var buttons: [String] = []
func show() {
print("Title: \(title)")
print("Message: \(message)")
print("Buttons: \(buttons.joined(separator: ", "))")
}
}
class DialogBuilder {
private var dialog = Dialog()
func setTitle(_ title: String) -> DialogBuilder {
dialog.title = title
return self
}
func setMessage(_ message: String) -> DialogBuilder {
dialog.message = message
return self
}
func addButton(_ button: String) -> DialogBuilder {
dialog.buttons.append(button)
return self
}
func build() -> Dialog {
return dialog
}
}
// Usage
let dialog = DialogBuilder()
.setTitle("Warning")
.setMessage("Are you sure you want to delete this file?")
.addButton("Cancel")
.addButton("Delete")
.build()
dialog.show()
```
### JavaScript:
```javascript
class Dialog {
constructor() {
this.title = "";
this.message = "";
this.buttons = [];
}
show() {
console.log(`Title: ${this.title}`);
console.log(`Message: ${this.message}`);
console.log(`Buttons: ${this.buttons.join(", ")}`);
}
}
class DialogBuilder {
constructor() {
this.dialog = new Dialog();
}
setTitle(title) {
this.dialog.title = title;
return this;
}
setMessage(message) {
this.dialog.message = message;
return this;
}
addButton(button) {
this.dialog.buttons.push(button);
return this;
}
build() {
return this.dialog;
}
}
// Usage
const dialog = new DialogBuilder()
.setTitle("Warning")
.setMessage("Are you sure you want to delete this file?")
.addButton("Cancel")
.addButton("Delete")
.build();
dialog.show();
```
## Abstract Factory
Provides an interface for creating families of related or dependent objects without specifying their concrete classes.
**Use Case:** Creating families of related or dependent objects without specifying their concrete classes.
### Swift
```swift
protocol Button {
func render()
}
class WindowsButton: Button {
func render() {
print("Render a button in Windows style")
}
}
class MacOSButton: Button {
func render() {
print("Render a button in MacOS style")
}
}
protocol GUIFactory {
func createButton() -> Button
}
class WindowsFactory: GUIFactory {
func createButton() -> Button {
return WindowsButton()
}
}
class MacOSFactory: GUIFactory {
func createButton() -> Button {
return MacOSButton()
}
}
// Usage
func createUI(factory: GUIFactory) {
let button = factory.createButton()
button.render()
}
let windowsFactory = WindowsFactory()
createUI(factory: windowsFactory)
let macFactory = MacOSFactory()
createUI(factory: macFactory)
```
### JavaScript:
```javascript
class WindowsButton {
render() {
console.log("Render a button in Windows style");
}
}
class MacOSButton {
render() {
console.log("Render a button in MacOS style");
}
}
class WindowsFactory {
createButton() {
return new WindowsButton();
}
}
class MacOSFactory {
createButton() {
return new MacOSButton();
}
}
// Usage
function createUI(factory) {
const button = factory.createButton();
button.render();
}
const windowsFactory = new WindowsFactory();
createUI(windowsFactory);
const macFactory = new MacOSFactory();
createUI(macFactory);
```
## Prototype
Creates new objects by copying an existing object, known as the prototype.
**Use Case:** Cloning objects to avoid the cost of creating new instances from scratch.
### Swift
```swift
protocol Clonable {
func clone() -> Self
}
class Prototype: Clonable {
var name: String
required init(name: String) {
self.name = name
}
func clone() -> Self {
return type(of: self).init(name: self.name)
}
}
// Usage
let original = Prototype(name: "Original")
let copy = original.clone()
copy.name = "Changed"
print(original.name) // Output: Original
print(copy.name) // Output: Changed
```
### JavaScript:
```javascript
class Prototype {
constructor(name) {
this.name = name;
}
clone() {
return new Prototype(this.name);
}
}
// Usage
const original = new Prototype("Original");
const copy = original.clone();
copy.name = "Changed";
console.log(original.name); // Output: Original
console.log(copy.name); // Output: Changed
``` | andres_paladines |
1,889,200 | Programming in 2024 | Sorry bro , you're late :( | 0 | 2024-06-15T03:57:48 | https://dev.to/y4sh/programming-in-2024-59f3 | Sorry bro , you're late :( | y4sh | |
1,889,199 | 🔥 Isolating Linux Performance Issues in 1 Minute Without Installing Any New Tools or Packages 🔥 | Hey everyone! I'm excited to share my latest video on isolating and identifying performance... | 0 | 2024-06-15T03:53:03 | https://dev.to/lakhera2015/isolating-linux-performance-issues-in-1-minute-without-installing-any-new-tools-or-packages-2h36 | devops, linux, performance, cloudcomputing | {% embed https://youtu.be/kaWzi3Kohog %}
Hey everyone! I'm excited to share my latest video on isolating and identifying performance issues in Linux systems. 🐧 Whether you're a seasoned pro or just starting out, these tips will help you tackle these performance bottlenecks.
🔍 In this video, I cover:
1️⃣ CPU: Learn how to use the w command to check load averages and identify CPU issues.
2️⃣ Memory: Discover how the vmstat 1 2 command can reveal memory pressure through si (swap in) and so (swap out) columns.
3️⃣ Network: Use ip -s link to spot errors and dropped packets, helping you pinpoint network problems.
4️⃣ Input/Output (I/O): Find out how to use top to detect I/O issues by looking at the wa (waiting) column.
📽️ This is just the first part of the series! Stay tuned for more in-depth debugging tips in upcoming videos. The video link is in the first comment.
🛠️ I appreciate your support. Happy debugging!
📚Book link: https://pratimuniyal.gumroad.com/l/cracking-the-devops-interview | lakhera2015 |
1,889,198 | Cortisync Reviews: A Comprehensive Guide to PrimeGENIX Cortisync | ➢Product Name - PrimeGenix CalmLean ➢ Composition — Natural Organic Compound ➢ Side-Effects—NA ➢... | 0 | 2024-06-15T03:52:30 | https://dev.to/bunu369/cortisync-reviews-a-comprehensive-guide-to-primegenix-cortisync-599p | **➢Product Name - PrimeGenix CalmLean
➢ Composition — Natural Organic Compound
➢ Side-Effects—NA
➢ Rating: —⭐⭐⭐⭐⭐
➢ Availability — Online
➢ Where to Buy - C[lick Here to Rush Your Order from the Official Website](https://sites.google.com/view/simplehealthh/CortiSync-Review)
Buy From Official Website ([Get Up to 45% Discount](https://sites.google.com/view/simplehealthh/CortiSync-Review))
🔥🔥>>>[Watch My Real Review](https://sites.google.com/view/simplehealthh/CortiSync-Review)!👈**
Introduction
Welcome to our in-depth review of CortiSync, a revolutionary product from PrimeGenix, designed to help manage cortisol levels and promote overall health. In this article, we'll delve into the workings of CortiSync, explore medical facts, discuss its pros and cons, examine the ingredients, tackle frequently asked questions, share user testimonials, present real-life results, and even compare it with other similar products. If you're looking for a reliable solution to cortisol-related issues, this review is just what you need.
Understanding Cortisol and its Impact on Health
Before we dive into the review, let's first understand what cortisol is and why its management is crucial. Cortisol is a steroid hormone produced by the adrenal glands in response to stress. While it plays a vital role in regulating metabolism, blood sugar levels, and immune response, chronically high cortisol levels can lead to a host of health problems, including weight gain, weakened immune system, and increased risk of various diseases.
What is CortiSync and How Does it Work?
CortiSync is a unique supplement from PrimeGenix, designed to help regulate cortisol levels and promote overall health. It does this by targeting the HPA (Hypothalamic-Pituitary-Adrenal) axis, the system responsible for cortisol production. By supporting this system, CortiSync helps maintain a healthy cortisol rhythm, reducing the negative impact of stress on the body.
PrimeGenix CortiSync: A Closer Look
Pros and Cons:
Pros: Effective cortisol management, supports HPA axis, natural ingredients, non-habit forming, 60-day money-back guarantee.
Cons: Results may vary, may have interacting with certain medications, cost may be higher compared to some over-the-counter supplements.
Ingredients and Properties
CortiSync's unique formula consists of:
Ashwagandha: Helps reduce stress and cortisol levels.
Phosphatidylserine: Supports the adrenal glands and promotes cortisol balance.
Magnolia Bark: Helps reduce stress and promote relaxation.
L-Theanine: A calming agent that aids in stress management.
Rhodiola Rosea: Helps the body adapt to stress and regulate cortisol levels.
FAQs
Q: Is CortiSync safe for long-term use?
A: Yes, CortiSync is safe for long-term use when taken as directed.
Q: Does CortiSync have any side effects?
A: CortiSync is generally well-tolerated, but individual results may vary. Some users may experience mild gastrointestinal symptoms.
Q: Can I take CortiSync with other medications?
A: It is always best to consult with a healthcare professional before taking any supplement, especially if you are on medication.
Testimonials
"I've been using CortiSync for a few months now, and I've noticed a significant reduction in my stress levels and better overall health." - John D.
"CortiSync has been a game-changer for me. I feel more focused, energetic, and my sleep has improved dramatically." - Lisa K.
Results
Many users have reported improved stress management, reduced cortisol levels, better sleep, increased energy, and better overall health after using CortiSync. It's important to remember that results may vary from person to person.
Comparison
When compared to other cortisol-regulating supplements, CortiSync stands out for its unique formula, reliable results, and strong customer support.
Where to Buy CortiSync
[CortiSync is available for purchase on the PrimeGenix website and Amazon.com](https://sites.google.com/view/simplehealthh/CortiSync-Review). Make sure to purchase from a trusted source to ensure authenticity.
Conclusion
CortiSync is a promising supplement for those looking to manage cortisol levels and promote overall health. While individual results may vary, many users have reported positive experiences with this product. Always consult with a healthcare professional before starting any new supplement regimen. | bunu369 | |
1,889,197 | Build your own SSO Service with next-auth integration | The SSO Service is a robust Single Sign-On (SSO) solution designed to streamline authentication and... | 0 | 2024-06-15T03:52:14 | https://dev.to/priyanshuverma/build-your-own-sso-service-with-next-auth-integration-4i2k | The SSO Service is a robust Single Sign-On (SSO) solution designed to streamline authentication and authorization across multiple applications. Users can authenticate once and seamlessly access various applications without the need for repeated login.
## Installation
To install and run the SSO Service, follow these steps:
1. Clone the repository:
```bash
git clone https://github.com/priyanshuverma-dev/sso-service.git
```
2. Install the dependencies:
```bash
cd sso-service
yarn
```
3. Configure the SSO Service:
- Open the `.env.example` file and update essential configuration options, including database connection details and secret keys.
4. Start the SSO Service:
```bash
yarn dev
```
For detailed information on utilizing the SSO Service endpoints, refer to the [API documentation](git clone https://github.com/priyanshuverma-dev/sso-service#).
## Features
### 1. Centralized Authentication and Authorization
The SSO Service provides a centralized mechanism for handling authentication and authorization, ensuring a seamless experience across multiple applications.
### 2. Multiple Authentication Providers
Support for various authentication providers, including email/password and social logins, allowing users to choose the method that suits them best.
### 3. Session Management and Token-Based Authentication
Efficient session management and secure token-based authentication for enhanced user security.
### 4. Role-Based Access Control (RBAC)
Fine-grained authorization controls through Role-Based Access Control, enabling administrators to manage user permissions effectively.
### 5. Customizable Login and Registration Flows
Flexibility to customize login and registration processes to align with specific application requirements.
## Implementation
The implementation details of the SSO Service can be found in the [sso-implementation repository](https://github.com/priyanshuverma-dev/sso-implementation). This repository provides examples and usage guidelines for seamlessly integrating the SSO Service into your applications.
## Contributing
Contributions to the SSO Service are welcome! If you wish to contribute, please follow the guidelines outlined in the [CONTRIBUTING.md](git clone https://github.com/priyanshuverma-dev/sso-service/CONTRIBUTING.md) file.
## License
This project is licensed under the MIT License.
| priyanshuverma | |
1,889,196 | Custom SSO Implementation | The SSO Implementation repository contains the implementation details and examples for seamlessly... | 0 | 2024-06-15T03:49:15 | https://dev.to/priyanshuverma/custom-sso-implementation-38pl | webdev, programming, opensource, typescript | The SSO Implementation repository contains the implementation details and examples for seamlessly integrating the SSO Service into your applications.
## Repository Link
[SSO Implementation Repository](https://github.com/priyanshuverma-dev/sso-implementation)
## Features
### 1. Example Integrations
Explore comprehensive examples demonstrating how to integrate the SSO Service into various types of applications, providing a foundation for seamless authentication and authorization.
### 2. Usage Guidelines
Clear and detailed guidelines on using the SSO Service within your applications, ensuring a smooth and secure single sign-on experience for end-users.
### 3. Customization Possibilities
Learn how to customize and extend the SSO Service to fit the specific requirements of your applications. Examples include incorporating custom authentication providers and tailoring login flows.
### 4. Best Practices
Access best practices for implementing SSO, including security considerations, error handling, and optimizing user experiences.
### 5. Troubleshooting
Troubleshooting tips and common solutions to address potential issues during the integration process.
## Getting Started
To integrate the SSO Service into your application, follow these steps:
1. Clone the SSO Implementation repository:
```bash
git clone https://github.com/priyanshuverma-dev/sso-implementation.git
```
2. Explore the examples and usage guidelines provided in the repository.
3. Customize the integration based on your application's requirements using the customization examples.
## Documentation
For detailed information on using the SSO Service in your applications, refer to the [SSO Implementation Documentation](https://github.com/priyanshuverma-dev/sso-implementation/#).
## Contributing
Contributions to the SSO Implementation repository are welcome! If you would like to contribute, please follow the guidelines outlined in the [CONTRIBUTING.md](https://github.com/priyanshuverma-dev/sso-implementation/CONTRIBUTING.md) file.
## License
This project is licensed under the MIT License.
| priyanshuverma |
1,889,194 | The Role of Programming in Die Sinking Machines | screenshot-1708712138756.png The Role of Programming in Die Sinking Machines Have you ever wondered... | 0 | 2024-06-15T03:41:15 | https://dev.to/mithokha_saderha_c6bb89ea/the-role-of-programming-in-die-sinking-machines-ak4 | screenshot-1708712138756.png
The Role of Programming in Die Sinking Machines
Have you ever wondered how those intricate shapes on metal parts are created? They are made by die sinking machines. Die sinking machines are amazing devices which use electricity and computer programming to carve metal into unique shapes. Let's explore the role of programming in die sinking and how it revolutionizes the production process.
Top features of Die Sinking Machines
Die sinking devices are recognized for their precision and accuracy. They could cut into hard metals, plastic materials and also other materials, producing kinds which can be intricate designs. The dies comprised of die products which can be sinking be used for different industries such as for instance automotive, aerospace, plus in cutting items for daily usage. The creations additionally provide constant quality and finds a pace which is quick that makes it perfect for mass manufacturing utilizing the desired specification.
Innovation in Die Sinking Machines
Advances in technology results in constant innovation in die machines which are sinking. Along with the assistance of computer programming, operators can make and go CAD (Computer Aided Design) files which are utilized as recommendations whenever the machining is considered by you procedure. This automation procedure actually helps to increase manufacturing effectiveness and minimize steadily the chances of errors. Die Sinking Machines products are continuously being enhanced to provide more accurate and outcomes that can be exact.
Security
Safety is surely an component which is vital of sinking devices. The unit have many safety features to end accidents and accidents. For example, the applying is programmed to avoid strokes that are overlapping which decreases the possibility of damaging the die and tooling. Additionally, the devices are enclosed to contain any shavings or debris that are produced through the cutting procedure. Using automation also minimizes contact which is individual the die, placing safety first.
Just how to Utilize Die Sinking Machines
To use die sinking, you should first have to create a drawing or design in CAD. Then, the scheduled system that accompany the die sinking machine could possibly be used to convert the design into machine-readable rule. The apparatus will probably be programmed to carve the design in to the desired product. It needs abilities which are certain use it optimally which may be gained through specialized training or training.
Quality
Die sinking products provide top-notch products that are finished have a appearance which is remarkable. The machining process creates little to no nagging issues for the surface of the die, so there is not any significance of further polishing. Additionally, the perseverance about the item which is last guaranteed by the device's accuracy and precision. Furthermore, the software used enables operators to generate changes which are on-the-spot you will find any errors. This, in change, advances the quality connected with last product.
Application
Die-sinking products are likely involved which is vital the production of dies for the selection of companies. It is actually used by the industry which is medical create medical tools, the automotive industry which can make vehicle components, the aerospace industry for aircraft elements, and so much more. Since the number of industries utilizing die machines being sinking, their importance furthermore increases.
In conclusion, edm die sinking product have an important role in the manufacturing industry and automation process. The computer-programmed technology and safety features ensure the machine operates effectively, producing high-quality products at a quick, consistent pace. Innovations in the technology continue to drive growth in the manufacturing industry, making die sinking machines an indispensable tool for businesses today.
Source: https://www.teruimachines.com/product-znc350-hot-sale-cnc-working-fluid-capacity-280l-znc-die-sinking-machine-edm | mithokha_saderha_c6bb89ea | |
1,889,193 | Advantages and Disadvantages of Die Sinking Machines | screenshot-1708712138756.png Benefits and drawbacks of Die Sinking Machines Die-sinking products are... | 0 | 2024-06-15T03:36:30 | https://dev.to/mithokha_saderha_c6bb89ea/advantages-and-disadvantages-of-die-sinking-machines-4o9e |
screenshot-1708712138756.png
Benefits and drawbacks of Die Sinking Machines
Die-sinking products are critical tools utilized in the manufacturing industry. The unit are widely useful to mold parts from metals, plastics, as well as other trash by using a die in summary. The die is just a block which is specific of using the specified type of the component being produced. The die sinking presses the die into the material which is natural create the design concerning the desired component.
Innovation
Among the top which is significant of die products that can easily be sinking be that they're versatile and revolutionary. They're going to have casting which is grey, allows them to make complex designs and forms with accuracy. The devices have actually really high precision rates, level control, and area which is great, making them well suited for creating custom parts. In addition, modern die sinking machines have actually revolutionary software and CAD/CAM technology that allows for automation, better rate, and accuracy in the manufacturing process.
Protection
With regards to safety, Die Sinking Machines pose a danger which is diminished operators in comparison with other manufacturing gear. These devices comes with a protection guard that protects the operator from any danger or harm that can result through the process. Furthermore, the apparatus is sold having a controller making sure these devices doesn’t function beyond its safety parameters.
Usage
An additional benefit of die devices which is often sinking that they're simple to use. The procedure connected with device is not hard, besides the device comes with a manual that guides the operator on your way which is most appropriate to utilize it. In addition, you will find also training programs available to teach operators in route which is better to put it to make use of. This simplicity of use makes the devices offered to both experienced and novice operators.
Quality
Die sinking devices were created for producing elements being top-quality. For the reason that they usually use precision molding, which ensures that the parts produced have actually finishes that are exemplary measurements, and properties that are technical. Moreover, the devices are designed to be durable, reducing chances of the gear deteriorating or creating products which are substandard.
Application
Die products being sinking an array of applications. The devices are used in to the creation of complex parts for various companies, like the automotive and aerospace companies. These companies need high precision and high-quality parts, and edm die sinking machine is the device which is perfect get the job done.
Drawbacks of Die Sinking Machines
Initial Expense
One of the main drawbacks of die devices being sinking their initial expense. The unit are fairly costly, since the expense is actually a barrier which is significant entry for small-scale manufacturers. The expense of upkeep may be high, also and so a greater investment which is initial needed.
Serviceability
Die sinking products require regular maintenance and servicing to make use of optimally. Meaning that the manufacturer need a split group to support the repairs out and servicing for the machine. Moreover, enough time which is lead components replacement are disadvantageous, as it could undoubtedly lead to downtime, lost revenue, and increased expenses that are functional.
Work Expenses
Operating a die unit which is sinking specific abilities which are perhaps not effortlessly discovered. Meaning that operators are relatively high priced to interact, besides the manufacturer might need certainly to buy training programs to make the abilities being necessary.
Environmental Impact
Die devices that are sinking pollutants and subscribe to degradation which is ecological. Even though devices have advanced into the reduction of air pollution, utilizing greener materials, there’s an effect which is environmental the vigor usage and disposal of waste material.
Simple suggestions to make use of Die Sinking device
Having a die unit which is sinking that you follow the actions that are next
1. Load the product which is raw the equipment
2. Load the die into the item and align it combined with product which is natural
3. Press the die onto the product which is normal
4. Cut fully out the necessary kind because regarding the machine’s control system
5. Remove the component which is completed
Conclusion
Die sinking machines offer significant advantages and disadvantages to manufacturers. The machines are innovative, produce high-quality parts, are easy to use, and are safe. However, the cnc edm die sinking machine are expensive to acquire, require high maintenance costs, require specialized labor, and have environmental impacts. Manufacturers need to strike a balance between the advantages and disadvantages of die sinking machines before deciding to invest in them.
Source: https://www.teruimachines.com/product-znc350-hot-sale-cnc-working-fluid-capacity-280l-znc-die-sinking-machine-edm | mithokha_saderha_c6bb89ea | |
1,888,344 | How to create Windows 11 VM on Microsoft Azure (Step by step guide) | Introduction Virtual Machine (VM) is a digitized version of a physical computer and they can run... | 0 | 2024-06-15T03:30:12 | https://dev.to/ayospecie/how-to-create-windows-11-vm-on-microsoft-azure-step-by-step-guide-2hnh | azure, virtualmachine, cloudcomputing | **Introduction**
Virtual Machine (VM) is a digitized version of a physical computer and they can run programs and operating systems, store data, connect to networks, and do other computing functions.
Azure VM uses entirely virtual resources provided by Microsoft Azure Platform. It gives more control over the computing environment and flexibility of virtualization without having to buy and maintain the physical hardware that runs it.
This blog post is a step by step guide to create and deploy a windows 11 VM on Azure.
**Here are the steps:**
Sign up/in to Azure portal,
Create VM,
Assign resource-specific settings,
Validate the assigned settings,
Initiate the resource.
**Sign up/in to Azure portal**
If you don't have an Azure subscription, click [here](https://azure.microsoft.com/en-us/free/?WT.mc_id=A261C142F) to create a free account and then sign in to Azure portal.
**Create VM on Azure**
After completing your sign up, follow the steps below:
a. In the search bar, type "Virtual Machine"
b. From the search results, select "Virtual Machine" from the list of resources and click create.
c) Give your virtual machine a name
d) In the region section, select the location you want your virtual machine to be
_A region refers to a specific geographical location with data centers that host infrastructure and services. Each region operates independently and is designed to be self-contained, with its own set of resources and infrastructure._
e) Then, click on the drop-down to select your availability option and availability zone.
_In Azure, a region can consist of three availability zones, known as Zone 1, Zone 2 and Zone 3. Each zone has one or more data centers that are kilometers apart from each other.
_
| ayospecie |
1,889,190 | Tuan Simon | Bức tranh cuộc đời tôi còn dang dở, nhưng tôi tin rằng với mỗi nét vẽ mỗi ngày, nó sẽ dần hoàn thiện... | 0 | 2024-06-15T03:25:51 | https://dev.to/cqtuansimon/tuan-simon-21k5 | Bức tranh cuộc đời tôi còn dang dở, nhưng tôi tin rằng với mỗi nét vẽ mỗi ngày, nó sẽ dần hoàn thiện và trở nên rực rỡ nhất.
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| cqtuansimon | |
1,889,188 | Create effortless elegance with our LED Smart Bathroom Mirror. | screenshot-1708188639945.png Create Effortless Elegance in Your Bathroom with Our LED Smart Bathroom... | 0 | 2024-06-15T03:24:00 | https://dev.to/mithokha_saderha_c6bb89ea/create-effortless-elegance-with-our-led-smart-bathroom-mirror-e07 | screenshot-1708188639945.png
Create Effortless Elegance in Your Bathroom with Our LED Smart Bathroom Mirror
Looking for a way to take your bathroom to the next level? Look no further than our innovative LED Smart Bathroom Mirror. With its state-of-the-art features and ease of use, our mirror is the perfect addition to any modern bathroom. Read on to learn more about the advantages of our mirror and how it can enhance your daily routine.
Benefits
Our LED Smart Bathroom Mirror is full of advantages rendering it many choice which is wonderful those attempting to upgrade their bathroom. It is additionally vital to appearance and feel your better whether you will get ready for work or finding the right road through per particular date, our mirror has anything. Many of the key advantages of our mirror include:
- Impressive illumination: Our mirror features LED lights that provide bright, even lighting that's ideal for using makeup products, shaving, or doing almost any task which will require visibility which is very good.
- Customizable settings: making use of this mirror, it is easy to adjust the brightness and colour with this LED lights to fit your choices. This permits one to develop a experience which is personalized's tailored to your needs that are unique magnificence.
- Smart technology: Our mirror comprises intuitive smart technology making it a simple task to manage virtually all of these features employing a smartphone app or remote. What this means is you can change the color or brightness for the lights, adjust the heat linked to the mirror, plus much more without making your smartphone.
- Energy-efficient: Our mirror features energy-efficient LED technology that keeps your power expenses low while nevertheless supplying lighting which is sufficient.
Innovation
Our Smart which is LED Bathroom is really revolutionary match of its advanced features and cutting-edge technology. We created contemporary property owners to your mirror in your mind, making use of at heart their significance of customization, power financial savings, and convenience. A number of the key innovations our mirror boasts include:
- Bluetooth connectivity: Our mirror works together with Bluetooth-enabled products, enabling you to stream music, sound recordings, and sometimes even phone calls from the comfort of this mirror.
- Voice control: because of our mirror's smart technology, you might make use of vocals commands to handle a lot of its features. This could be perfect for times when both tactile arms are preoccupied or perhaps you just prefer hands-free control.
- Anti-fog cup: Our mirror comes with anti-fog cup that prevents the built-up of vapor and fog, also during hot showers or steamy restrooms.
Safety
Protection is of the value which is utmost virtually any bathroom, and that's why we've made sure to come up with our mirror being mindful of this. Our LED Smart Bathroom Mirror features construction which is tamper-proof maintaining both both you and your family safe from broken cup or other mishaps. In addition, our glass which is anti-fog technology to be sure that mirror is still clear and simple to see even yet in humid, steamy surroundings.
Usage
Our Smart which is LED Bathroom is extremely user-friendly, making it possible for most likely the many customers that are technologically-challenged take pleasure from all its advantages. It's easy to install and run, with intuitive settings that create adjusting its brightness, color, and temperature fairly simple. You will need to have the many from the bathroom routine whether you want hands-free noise manual or control smartphone software control, our mirror has all.
Simple suggestions to utilize
Getting started with our Smart which is led smart mirror seriously isn't difficult. Simply arrange it on your bathroom wall surface link and surface it to your smartphone or other products that can easily be bluetooth. After that, it is possible to get a grip on the mirror's settings and features with simplicity. Adjust the lighting, temperature, and color to your taste, and luxuriate in effortless streaming associated with media that are favorite Bluetooth connectivity.
Provider
We attempt to provide service which is top-notch most of the of the customers, offering a selection of resources and tools to assist them to make the most of our LED Smart Bathroom Mirror. Our specialists which may be friendly constantly open to provide support and respond to questions, and our web site includes a wide range of information on how best to utilize and get numerous from our product.
Quality
We you need to quality actually, that will be the great reasons why each of our items are built to the most requirements of craftsmanship and durability. Our Smart which is LED Bathroom is performed with premium materials being designed to last, now we are confident it's prone to will give you extremely time which is long of use.
Application
Modern bathroom seats can be utilized in very nearly every bathroom environment, be it in an establishing or domestic which is professional. Also, they truly are ideal for many types of toilets and maybe they are typically a task which is effortless install. Some have specialized functions that cater to individuals who have particular requirements, the same as seniors or those with mobility problems while many models include fundamental functions. a bathroom which is contemporary is a low priced, practical, and addition which is contemporary could strengthen your house if you are trying to upgrade your bathroom.
Conclusion
Our LED Smart Bathroom Mirror is an excellent choice for modern homeowners looking to add a touch of class and convenience to their bathroom routine. Whether you're a busy professional or a dedicated parent, our led restroom mirror has everything you need to get ready in style. With its impressive features, innovative technology, and cutting-edge design, our mirror is the perfect addition to any home.
Source: https://www.kahnpan.com/application/led-smart-mirror | mithokha_saderha_c6bb89ea | |
1,889,184 | JavaScript: All about Cookies | Cookies are small pieces of data stored on the client's browser by a website. They are used to... | 0 | 2024-06-15T03:16:42 | https://dev.to/alamfatima1999/javascript-cookies-13ml | Cookies are small pieces of data stored on the client's browser by a website. They are used to remember information about the user between page loads or sessions. Here's a detailed explanation of cookies in JavaScript and the differences between HTTP and HTTPS cookies:
Cookies in JavaScript
Creating and Setting Cookies
To create and set a cookie in JavaScript, you can use the document.cookie property. Here’s an example:
javascript
```JS
// Set a cookie
document.cookie = "username=JohnDoe; expires=Fri, 31 Dec 2024 12:00:00 UTC; path=/";
```
username=JohnDoe: The name and value of the cookie.
expires: The expiration date and time. If not set, the cookie will be a session cookie and will be deleted when the browser is closed.
path=/: The path where the cookie is accessible. If set to /, the cookie is accessible within the entire domain.
**Reading Cookies**
To read cookies, you can access document.cookie, which returns all cookies as a single string:
```JS
// Read all cookies
const cookies = document.cookie; // "username=JohnDoe; otherCookie=SomeValue"
```
To get a specific cookie value, you may need to parse this string:
```JS
// Get specific cookie value
function getCookie(name) {
const value = ; ${document.cookie};
const parts = value.split(; ${name}=);
if (parts.length === 2) return parts.pop().split(';').shift();
}
```
**Deleting Cookies**
To delete a cookie, set its expiration date to a past date:
```JS
// Delete a cookie
document.cookie = "username=; expires=Thu, 01 Jan 1970 00:00:00 UTC; path=/;";
```
HTTP vs. HTTPS Cookies
**HTTP Cookies**
```
Unsecured Transmission: HTTP cookies are transmitted over regular HTTP connections. This means the data, including the cookie information, is not encrypted and can be intercepted by attackers.
Set with the Set-Cookie Header: When a server responds to an HTTP request, it can include a Set-Cookie header to store a cookie in the browser.
Basic Usage: Suitable for non-sensitive data or during development in a secure environment.
```
**HTTPS Cookies**
```
Secured Transmission: HTTPS cookies are transmitted over HTTPS connections, ensuring that the data is encrypted during transmission. This prevents eavesdropping and man-in-the-middle attacks.
Secure Attribute: When setting cookies for HTTPS, you can use the Secure attribute to ensure the cookie is only sent over HTTPS:
```
http
Set-Cookie: name=value; Secure
**HttpOnly** Attribute: This attribute can be added to cookies to prevent JavaScript from accessing them, enhancing security against XSS (Cross-Site Scripting) attacks:
http
```JS
Set-Cookie: name=value; HttpOnly
```
Differences
Security:
HTTP: Data is not encrypted, making it vulnerable to interception.
HTTPS: Data is encrypted, providing a secure transmission.
Attributes:
Secure Attribute: Ensures cookies are only sent over HTTPS.
HttpOnly Attribute: Prevents access to cookies via JavaScript, providing additional security.
Usage:
HTTP Cookies: Suitable for non-sensitive data or during development.
HTTPS Cookies: Recommended for sensitive data and production environments to ensure data security.
Example
Here’s an example of setting a secure and HttpOnly cookie:
http
```JS
Set-Cookie: sessionToken=abc123; Secure; HttpOnly; Path=/; Expires=Fri, 31 Dec 2024 12:00:00 GMT;
```
sessionToken=abc123: The name and value of the cookie.
Secure: The cookie is only sent over HTTPS.
HttpOnly: The cookie cannot be accessed via JavaScript.
Path=/: The cookie is accessible within the entire domain.
Expires: The expiration date and time.
By understanding and correctly implementing cookies, you can manage user sessions, store user preferences, and enhance the security of your web applications. | alamfatima1999 | |
1,889,183 | Sleek and simple, the LED Smart Bathroom Mirror complements any design style. | screenshot-1708188639945.png Looking for a new bathroom mirror that is both innovative and safe?... | 0 | 2024-06-15T03:12:34 | https://dev.to/mithokha_saderha_c6bb89ea/sleek-and-simple-the-led-smart-bathroom-mirror-complements-any-design-style-3d4p | screenshot-1708188639945.png
Looking for a new bathroom mirror that is both innovative and safe? Check out the LED Smart Bathroom Mirror. With its sleek and simple design, this mirror complements any design style.
Features of the Smart which is LED bathroom
There are numerous assets that are advantageous using the Smart which is LED at home. For instance, it offers illumination which is enhanced making your bathroom area brighter and a complete much more inviting. Moreover, the mirror is saving which is energy making use of LED lights to reduce your electric bills and minimize your carbon impact. The LED Smart Mirror is additionally an task which is not difficult install and keep preserving, which makes it good addition to any bathroom.
Innovation
The LED Smart Bathroom Mirror is just a groundbreaking product which is brand-new uses technology which is revolutionary improve your bathroom experience. The mirror provides illumination which is superior rendering it safer to see yourself as you obtain ready in the morning along side its built-in LED lights. The mirror's smart technology additionally enables you to personalize the lighting to your requirements, to ensure that you are able to create the ambiance which is ideal your bathroom.
Protection
Security can be quite a concern which is top terms of bathroom services and products, combined with the LED Smart Bathroom Mirror isn't any exclusion. The mirror is made from top-quality materials and this can be designed to last, also it includes a guarantee to make certain your satisfaction. The lights which could be LED also cool to touch, generally there is not any possibility burns or some other accidents.
Usage
Using the LED Smart Bathroom Mirror is very simple. The mirror comes with simple instructions that anybody can follow, plus it might be installed in just a moments that are few. Following the mirror is working, everything you need to do is touch the switch to make about the lights which are LED. There after, you'll modify the illumination to meet your needs, creating an bathroom ambiance which is ideal. Just how to Use
To work alongside the Smart which is LED Bathroom, just follow these simple steps:
1. Gather your tools: a drill shall be needed by you, screws, and a mounting bracket to put in the mirror.
2. find the location which is perfect pick a spot in your bathroom where the mirror will probably be available and offer ab muscles illumination which is way better.
3. Install the mounting bracket: utilize the drill to connect the mounting bracket to your wall surface.
4. Attach the mirror: Hang the Smart which is LED bathroom in the mounting bracket.
5. Turn in the lights: Touch the switch to the section of this mirror to show the lights on which are LED.
Provider
The LED Smart Bathroom Mirror is top-notch with regards to support. The led mirror in bathroom has a guarantee to be certain your satisfaction, and a customer care team this is certainly actually constantly available to respond to any questions that are relevant may have. Additionally, the LED Smart Bathroom Mirror is supported by way of a group of specialists who is able to be specialized in enhancing the product and providing the absolute most experience that works well their customers.
Quality
Finally, the Smart which is LED Bathroom is unrivaled. The mirror is manufactured out of top-quality materials being created to last, along with the LED lights are manufactured to supply lighting which is superior years to come. Moreover, the mirror is simple to generate and keep, which makes it a investment which is fantastic almost any household.
Conclusion
Overall, the LED Smart Bathroom Mirror is a great addition to any bathroom. Whether you are renovating your space or simply looking for a new bath led mirror, the LED Smart Bathroom Mirror is a stylish and functional option that provides superior lighting and a great user experience. So why wait? Upgrade your bathroom today with the LED Smart Bathroom Mirror and experience the difference for yourself.
Source: https://www.kahnpan.com/application/led-mirror-in-bathroom | mithokha_saderha_c6bb89ea | |
1,889,182 | Create laravel project on Project IDX | Google has launched a beta version of project IDX, an IDE that works on browsers. To create a new... | 0 | 2024-06-15T03:10:19 | https://dev.to/asadut_zaman/create-laravel-project-on-project-idx-3aho | Google has launched a beta version of project IDX, an IDE that works on browsers.
To create a new laravel project click go the [idx.google.com](https://idx.google.com/) and "Select all the templates"
Select Backend > laravel
Give a name to your project
And here you go, your laravel is ready to play
You can share the link that can be accessible over the internet.
The IDX has all the features just like the VS Code
However, IDX is now supporting only one project. Here you can delete share or rename your project
| asadut_zaman | |
1,889,181 | Shadcn UI: Must-Have Tools & Resources | awesome-shadcn/ui A curated list of awesome things related to shadcn/ui Created... | 0 | 2024-06-15T03:07:20 | https://dev.to/sh20raj/shadcn-ui-must-have-tools-resources-5488 | shadcn | <p align="center">
<br>
<img width="400" src="https://raw.githubusercontent.com/birobirobiro/awesome-shadcn-ui/64729b2c178e3fdcb42c0c7bf341bcde7ae502ea/assets/logo.svg" alt="logo of awesome-shadcn/ui repository">
<br>
<br>
</p>
<h2 align='center'>awesome-shadcn/ui</h2>
<p align='center'>
A curated list of awesome things related to <a href='https://ui.shadcn.com/' target="_blank">shadcn/ui</a>
<br><br>
<p align='center'>
<i>Created by: <a href='https://birobirobiro.dev/' target="_blank">birobirobiro.dev</a></i>
<br><br>
<a href='https://github.com/birobirobiro/awesome-shadcn-ui/' target="_blank">
<img src='https://cdn.rawgit.com/sindresorhus/awesome/d7305f38d29fed78fa85652e3a63e154dd8e8829/media/badge.svg' alt='Awesome'>
</a>
</p>
## Libs and Components
- [aceternity-ui](https://ui.aceternity.com/) - Copy paste the most trending react components without having to worry about styling and animations.
- [assistant-ui](https://github.com/Yonom/assistant-ui) - React Components for AI Chat
- [autocomplete-select-shadcn-ui](https://www.armand-salle.fr/post/autocomplete-select-shadcn-ui) - Autocomplete component built with shadcn/ui and Fancy Multi Select by Maximilian Kaske.
- [auto-form](https://github.com/vantezzen/auto-form) - A React component that automatically creates a shadcn/ui form based on a zod schema.
- [capture-photo](https://github.com/UretzkyZvi/capture-photo) - Capture-Photo is a versatile, browser-based React component designed to streamline the integration of camera functionalities directly into your web applications.
- [clerk-elements](https://clerk.com/docs/elements/examples/shadcn-ui) - Composable components that can be used to build custom UIs on top of Clerk's APIs
- [clerk-shadcn-theme](https://github.com/stormynight9/clerk-shadcn-theme) - Easily synchronize your Clerk `<SignIn />` and `<SignUp />` components with your shadcn/ui styles
- [country-state-dropdown](https://github.com/Jayprecode/country-state-dropdown) - This Component is built with Nextjs, Tailwindcss, shadcn/ui & Zustand for state management.
- [cult-ui](https://www.cult-ui.com/) - A well curated set of animated shadcn-style React components for more specific use-cases.
- [credenza](https://github.com/redpangilinan/credenza) - Ready-made responsive modal component for shadcn/ui.
- [date-range-picker-for-shadcn](https://github.com/johnpolacek/date-range-picker-for-shadcn) - Includes multi-month views, text entry, preset ranges, responsive design, and date range comparisons.
- [downshift-shadcn-combobox](https://github.com/TheOmer77/downshift-shadcn-combobox) - Combobox/autocomplete component built with shadcn/ui and Downshift.
- [echo-editor](https://github.com/Seedsa/echo-editor) - A modern WYSIWYG rich-text editor base on tiptap and shadcn/ui
- [emblor](https://github.com/JaleelB/emblor) - A highly customizable, accessible, and fully-featured tag input component built with shadcn/ui.
- [enhanced-button](https://github.com/jakobhoeg/enhanced-button) - An enhanced version of the default shadcn-button component.
- [fancy-multi-select](https://craft.mxkaske.dev/post/fancy-multi-select) - The Multi Select Component is inspired by campsite.design's and cal.com's settings forms.
- [farmui](https://farmui.com) - A shadcn and tailwindcss based beautifully styled and animated component library solution with its own [npm package](https://www.npmjs.com/package/@kinfe123/farm-ui) to install any component with in a component registery.
- [file-uploader](https://github.com/sadmann7/file-uploader) - A file uploader built with shadcn/ui and react-dropzone.
- [file-vault](https://github.com/ManishBisht777/file-vault) - File upload component for React.
- [ibelick/background-snippet](https://bg.ibelick.com/) - Ready to use collection of modern background snippets.
- [indie-ui](https://github.com/Ali-Hussein-dev/indie-ui) - UI components with variants - [Docs](https://ui.indie-starter.dev)
- [magicui](https://magicui.design) - React components to build beautiful landing pages using tailwindcss + framer motion + shadcn/ui
- [neobrutalism-components](https://github.com/ekmas/neobrutalism-components) - Collection of neobrutalism-styled Tailwind React and Shadcn UI components.
- [nextjs-components](https://components.bridger.to/) - A collection of Next.js components build with TypeScript, React, shadcn/ui, Craft UI, and Tailwind CSS.
- [nextjs-dnd](https://github.com/sujjeee/nextjs-dnd) - Sortable Drag and Drop with Next.js, shadcn/ui, and dnd-kit.
- [novel](https://github.com/steven-tey/novel) - Novel is a Notion-style WYSIWYG editor with AI-powered autocompletion. Built with [Tiptap](https://tiptap.dev/) + [Vercel AI SDK](https://sdk.vercel.ai/docs).
- [password-input](https://gist.github.com/mjbalcueva/b21f39a8787e558d4c536bf68e267398) - shadcn/ui custom password input.
- [phone-input-shadcn-ui](https://www.armand-salle.fr/post/phone-input-shadcn-ui) - Custom phone number component built with shadcn/ui.
- [planner](https://github.com/UretzkyZvi/planner) - Planner is a highly adaptable scheduling component tailored for React applications.
- [plate](https://github.com/udecode/plate) - The rich-text editor for React.
- [pricing-page-shadcn](https://github.com/m4nute/pricing-page-shadcn) - Pricing Page made with shadcn/ui & Next.js 14. Completely customizable.
- [progress-button](https://github.com/tomredman/ProgressButton) - An extension of shadcn/ui button component that uses a state machine to drive a progress UX.
- [react-dnd-kit-tailwind-shadcn-ui](https://github.com/Georgegriff/react-dnd-kit-tailwind-shadcn-ui) - Drag and drop Accessible kanban board implementing using React, dnd-kit, tailwind, and shadcn/ui.
- [search-address](https://github.com/UretzkyZvi/search-address) - The SearchAddress component provides a flexible and interactive search interface for addresses, utilizing the powerful Nominatim service from OpenStreetMap.
- [shadcn-blocks](https://ui.shadcn.com/blocks) - Blocks is the official shadcn/ui pre-made but customizable components that can be copied and pasted into your projects.
- [shadcn-cal](https://shadcn-cal-com.vercel.app/?date=2024-04-29) - A copy of the monthly calendar used by Cal.com with shadcn/ui, Radix Colors and React Aria.
- [shadcn-chat](https://github.com/jakobhoeg/shadcn-chat) - Customizable and reusable chat component for you to use in your projects.
- [shadcn-data-table-advanced-col-opions](https://github.com/danielagg/shadcn-data-table-advanced-col-opions) - Column-resizing option to shadcn/ui DataTable.
- [shadcn-drag-table](https://github.com/zenoncao/shadcn-drag-table) - A drag-and-drop table component using shadcn/ui and Next.js.
- [shadcn-extends](https://github.com/lucioew28/extends) - Intended to be a collection of components built using shadcn/ui.
- [shadcn-extension](https://github.com/BelkacemYerfa/shadcn-extension) - An open-source component collection that extends your UI library, built using shadcn/ui components.
- [shadcn-linear-combobox](https://github.com/damianricobelli/shadcn-linear-combobox) - A copy of the combobox that Linear uses to set the priority of a task.
- [shadcn-multi-select-component](https://github.com/sersavan/shadcn-multi-select-component) - A multi-select component designed with shadcn/ui
- [shadcn-phone-input-2](https://github.com/damianricobelli/shadcn-phone-input) - Simple and formatted phone input component built with shadcn/ui y libphonenumber-js
- [shadcn-phone-input](https://github.com/omeralpi/shadcn-phone-input) - Customizable phone input component with proper validation for any country.
- [shadcn-stepper](https://github.com/damianricobelli/shadcn-stepper) - A complete stepper component built with shadcn/ui
- [shadcn-table-v2](https://github.com/sadmann7/shadcn-table) - shadcn/ui table component with server-side sorting, filtering, and pagination.
- [shadcn-ui-expansions](https://github.com/hsuanyi-chou/shadcn-ui-expansions) - A lots of useful components which shadcn/ui does not have out of the box.
- [shadcn-ui-sidebar](https://github.com/salimi-my/shadcn-ui-sidebar) - A stunning, functional and responsive retractable sidebar built on top of shadcn/ui.
- [sortable](https://github.com/sadmann7/sortable) - A sortable component built with shadcn/ui, radix ui, and dnd-kit.
- [time-picker](https://github.com/openstatusHQ/time-picker) - A simple TimePicker for your shadcn/ui project.
- [uixmat/onborda](https://github.com/uixmat/onborda) - Give your application the onboarding it deserves with Onborda product tour for Next.js
## Apps
### Plugins and Extensions
- [chat-with-youtube](https://chat-with-youtube.vercel.app/) - A chrome extension is designed to give you the ability to efficiently summarize videos, easily search for specific parts, and enjoy additional useful features.
- [raycast-shadcn](https://www.raycast.com/luisFilipePT/shadcn-ui) - Raycast extension to Browse shadcn/ui documentation, components and examples
- [shadcn-ui](https://marketplace.visualstudio.com/items?itemName=SuhelMakkad.shadcn-ui) - Add components from shadcn/ui directly from VS Code.
- [shadcn/ui Components Manager](https://plugins.jetbrains.com/plugin/23479-shadcn-ui-components-manager) - A plugin for Jetbrain products. It allows you to manage your shadcn/ui components across Svelte, React, Vue, and Solid frameworks with this plugin. Simplify tasks like adding, removing, and updating components.
- [vscode-shadcn-svelte](https://marketplace.visualstudio.com/items?itemName=Selemondev.vscode-shadcn-svelte&ssr=false#overview) - VS Code extension for shadcn/ui components in Svelte projects.
- [vscode-shadcn-ui-snippets](https://marketplace.visualstudio.com/items?itemName=VeroXyle.shadcn-ui-snippets) - Easily import and use shadcn-ui components with ease using snippets within VSCode. Just type cn or shadcn in you jsx/tsx file and you will get a list of all the components to choose from.
- [vscode-shadcn-vue](https://marketplace.visualstudio.com/items?itemName=Selemondev.vscode-shadcn-vue) - Extension for integrating shadcn/ui components into Vue.js projects.
### Colors and Customizations
- [10000+Themes for shadcn/ui](https://ui.jln.dev/) - 10000+ Themes for shadcn/ui.
- [dizzy](https://dizzy.systems/) - Bootstrap a new Next or Vite project with shadcn/ui. Customize font, icons, colors, spacing, radii, and shadows.
- [gradient-picker](https://github.com/Illyism/gradient-picker) - Fancy Gradient Picker built with Shadcn UI, Radix UI and Tailwind CSS.
- [navnote/rangeen](https://github.com/navnote/rangeen) - Tool that helps you to create a colour palette for your website
- [shadcn-ui-customizer](https://github.com/Railly/shadcn-ui-customizer) - POC - shadcn/ui themes with color pickers
- [ui-colorgen](https://ui-colorgen.vercel.app/) - An application designed to assist you with color configuration of shadcn/ui.
- [zippy starter's shadcn/ui theme generator.](https://zippystarter.com/tools/shadcn-ui-theme-generator) - Easily create custom themes from a single colour that you can copy and paste into your apps.
### Animations
- [magicui.design](https://magicui.design) - Largest collection of open-source react components to build beautiful landing pages.
- [motionvariants](https://github.com/chrisabdo/motionvariants) - Beautiful Framer Motion Animations.
### Tools
- [5devs](https://www.5devs.com.br/) - A website to get fake brazilian data for testing purposes.
- [cut-it](https://github.com/mehrabmp/cut-it) - Link shortener built using Next.js App Router, Server Actions, Drizzle ORM, Turso and styled with shadcn/ui
- [CV Forge](https://cvforge.app) - Resume builder, build with @shadcn/ui, react-hook-form and react-pdf
- [form-builder](https://github.com/AlandSleman/FormBuilder) - UI based codegen tool to easily create Beautiful and Type safe @shadcn/ui forms.
- [imgsrc](https://imgsrc.io/) - Generate beautiful Open Graph images with zero effort.
- [invoify](https://github.com/aliabb01/invoify) - An invoice generator app built using Next.js, Typescript, and shadcn/ui
- [pastecode](https://github.com/Quorin/PasteCode.app) - Pastebin alternative built with Typescript, Next.js, Drizzle, Shadcn, RSC
- [QuackDB](https://github.com/mattf96s/QuackDB) - Open-source in-browser DuckDB SQL editor
- [shadcn-pricing-page-generator](https://shipixen.com/shadcn-pricing-page) - The easiest way to get a React pricing page with shadcn/ui, Radix UI and/or Tailwind CSS.
- [translate-app](https://github.com/developaul/translate-app) - Translate App using TypeScript, Tailwind CSS, NextJS, Bun, shadcn/ui, AI-SDK/OpenAI, Zod
- [v0](https://v0.dev/) - Vercel's generative UI system, built on shadcn/ui and TailwindCSS, allows effortless UI generation from text prompts and/or images. It produces React and HTML code, integration is also possible via v0 CLI command.
## Platforms
- [bolhadev](https://bolhadev.chat/) - The quickest path to learn English is speaking it regularly. Just find someone to chat with.
- [enjoytown](https://github.com/avalynndev/enjoytown) - A free anime, manga, movie, tv-shows streaming platform. Built with Nextjs, shadcn/ui
- [infinitunes](https://github.com/rajput-hemant/infinitunes) - A Simple Music Player Web App built using Next.js, shadcn/ui, Tailwind CSS, DrizzleORM and more...
- [kd](https://github.com/gneiru/kd) - Ad-free Kdrama streaming app. Built with Nextjs, Drizzle ORM, NeonDB and shadcn/ui
- [plotwist](https://plotwist.app/en-US) - Easy management and reviews of your movies, series and animes using Next.js, Tailwind CSS, Supabase and shadcn/ui.
## Ports
- [Angular](https://github.com/goetzrobin/spartan) - Angular port of shadcn/ui
- [Flutter](https://github.com/nank1ro/shadcn-ui) - Flutter port of shadcn/ui
- [Franken UI](https://www.franken-ui.dev/) - HTML-first, framework-agnostic, beautifully designed components that you can truly copy and paste into your site. Accessible. Customizable. Open Source.
- [JollyUI](https://github.com/jolbol1/jolly-ui) - shadcn/ui compatible react aria components
- [Kotlin](https://github.com/dead8309/shadcn-kotlin) - Kotlin port of shadcn/ui
- [Phoenix Liveview](https://github.com/bluzky/salad_ui) - Phoenix Liveview port of shadcn/ui
- [React Native](https://github.com/Mobilecn-UI/nativecn-ui) - React Native port of shadcn/ui
- [React Native](https://github.com/mrzachnugent/react-native-reusables) - React Native port of shadcn/ui (recommended)
- [Ruby](https://github.com/aviflombaum/shadcn-rails) - Ruby port of shadcn/ui
- [Solid](https://github.com/hngngn/shadcn-solid) - Solid port of shadcn/ui
- [Svelte](https://github.com/huntabyte/shadcn-svelte) - Svelte port of shadcn/ui
- [Swift](https://github.com/Mobilecn-UI/swiftcn-ui) - Swift port of shadcn/ui
- [Vue](https://github.com/radix-vue/shadcn-vue) - Vue port of shadcn/ui
## Design System
- [shadcn-ui-components](https://www.figma.com/community/file/1342715840824755935/shadcn-ui-components) - Every component recreated in Figma.
- [shadcn-ui-storybook](https://65711ecf32bae758b457ae34-uryqbzvojc.chromatic.com/) - All shadcn/ui components registered in the storybook by [JheanAntunes](https://github.com/JheanAntunes/storybook-shadcn)
- [shadcn-ui-storybook](https://fellipeutaka-ui.vercel.app/?path=/docs/components-accordion--docs) - All shadcn/ui components registered in the storybook by [fellipeutaka](https://github.com/fellipeutaka/ui)
## Boilerplates / Templates
- [chadnext](https://github.com/moinulmoin/chadnext) - Quick Starter Template includes Next.js 14 App router, shadcn/ui, LuciaAuth, Prisma, Server Actions, Stripe, Internationalization and more.
- [design-system-template](https://github.com/arevalolance/design-system-template) - Turborepo + TailwindCSS + Storybook + shadcn/ui
- [horizon-ai-nextjs-shadcn-boilerplate](https://horizon-ui.com/boilerplate-shadcn) - Premium AI NextJS & Shadcn UI Boilerplate + Stripe + Supabase + OAuth
- [kirimase](https://kirimase.dev/) - A template and boilerplate for quickly starting your next project with shadcn/ui, Tailwind CSS, and Next.js.
- [magicui-startup-templates](https://magicui.design/docs/templates/startup) - Magic UI Startup template built using shadcn/ui + tailwindcss + framer-motion
- [next-shadcn-dashboard-starter](https://github.com/Kiranism/next-shadcn-dashboard-starter) - Admin Dashboard Starter with Next.js 14 and shadcn/ui
- [nextjs-mdx-blog](https://github.com/ChangoMan/nextjs-mdx-blog) - Starter template built with Contentlayer, MDX, shadcn/ui, and Tailwind CSS.
- [shadcn-landing-page](https://github.com/leoMirandaa/shadcn-landing-page) - Landing page template using shadcn/ui, React, Typescript and Tailwind CSS
- [shadcn-landing-page](https://github.com/nobruf/shadcn-landing-page) - Project conversion [shadcn-vue-landing-page](https://github.com/leoMirandaa/shadcn-vue-landing-page) to nextjs - Landing page template using Nestjs, shadcn/ui, TypeScript, Tailwind CSS
- [shadcn-nextjs-free-boilerplate](https://github.com/horizon-ui/shadcn-nextjs-boilerplate) - Free & Open-source NextJS Boilerplate + ChatGPT API Dashboard Template
- [shadcn-vue-landing-page](https://github.com/leoMirandaa/shadcn-vue-landing-page) - Landing page template using Vue, shadcn-vue, TypeScript, Tailwind CSS
- [t3-app-template](https://github.com/gaofubin/t3-app-template) - This is the admin template for T3 Stack and shadcn/ui
- [taxonomy](https://github.com/shadcn/taxonomy) - An open source application built using the new router, server components and everything new in Next.js
- [turborepo-shadcn-ui-tailwindcss](https://github.com/henriqpohl/turborepo-shadcn-ui-tailwindcss) - Turborepo starter with shadcn/ui & Tailwind CSS pre-configured for shared ui components.
- [turborepo-launchpad](https://github.com/JadRizk/turborepo-launchpad) - A comprehensive monorepo boilerplate for shadcn projects using Turbo. It features a highly scalable setup ideal for developing complex applications with shared components and utilities.
## Star History
<picture>
<source media="(prefers-color-scheme: dark)" srcset="https://api.star-history.com/svg?repos=birobirobiro/awesome-shadcn-ui&type=Date&theme=dark" />
<source media="(prefers-color-scheme: light)" srcset="https://api.star-history.com/svg?repos=birobirobiro/awesome-shadcn-ui&type=Date" />
<img alt="Star History Chart" src="https://api.star-history.com/svg?repos=birobirobiro/awesome-shadcn-ui&type=Date" />
</picture>
## Contributors
Thanks goes to all these wonderful people:
<a href="https://github.com/birobirobiro/awesome-shadcn-ui/graphs/contributors">
<img src="https://contrib.rocks/image?repo=birobirobiro/awesome-shadcn-ui" />
</a> | sh20raj |
1,889,180 | The Importance of Solar Bypass Diodes in Photovoltaic Systems | The significance of Solar Avoid Diodes in Solar Energy Methods Are you currently curious how panels... | 0 | 2024-06-15T03:03:16 | https://dev.to/mithokha_saderha_c6bb89ea/the-importance-of-solar-bypass-diodes-in-photovoltaic-systems-1e3c | The significance of Solar Avoid Diodes in Solar Energy Methods
Are you currently curious how panels being solar one of the main elements which might be make that is vital which are often solarmay be the bypass diodethat is solar. , we will explain exactly what a bypass this is certainly solar is, what its advantages are, how it operates, it brings to systems which can be photovoltaic along with it, its application, and so the values.
5959e2011c4d42b323880b85a811f5fd1936c572dd0ed4a513597cdfbd6d1e87.jpg
Just what is a diode that is avoid is solar?
A bypass that is be considered a devices solarmay this is certainly small does work being truly a switch when you look at the panelcircuitry this is certainly solars. Its typically put between every mobilethat is electrons that are solars enabling bypass a mobile that is shaded preventing it from impeding the electricity movement. This could be a safeguarding system that protects the cells being solars overheating, overloading, and voltages changes.
Top features of Solar Avoid Diodes
The energy this will be actually main of up a bypass diode this is really solars wouldn't it be strengthens the durability and effectiveness connected with panels system this is certainly solar. This implies that the electricity moves effectively to a cells being various are staying are solars increasing their production by preventing them from gaining here stress. The bypass diode additionally prevents heating and hotspots panel that is being is developing is induce and reduced the panel effectiveness that is generals.
Innovation of Solar Avoid Diodes
The technology behind solar bypass diodes in addition has rate this is certainly high panels which are solar have actually really developed when you look at the long run. Diodes that have been panels that are typically devote usually have a tendency to consumes a quantity that is really considerables of you will need to certainly used. Presents panel this is certainly solar, nevertheless, utilizes diodes being diodes that are innovative labeled are"battery-backfilled" that store expense into the individual to help keep these devices charged during durations of low sunlight amounts.
Security of Solar Avoid Diodes
The bypass diode is sold with added securitys benefits as it prevents shorts being imbalances which may be electric gift suggestions occurring in to the panel system that is solars. These are typically avoided by it from overheating, decreases the chances of fires, finally helps make the panel this is certainly really solar much safer.
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Steps to make Best Use Of Solar Avoid Diodes?
Solar bypass diodes are actually an easy task to install and extremely usually have actuallys installments that is really cellular. A solar bypass diode might be connected in synchronous each and every and every mobile this is certainly solar an powered this is certainly electric is solar to simply help manage voltage and corrections which can be present. It is additionally vital to verify that the diodes are arranged and their quality as soon as you place in a charged energy this is actually solars. Diodes require upkeep and methods to fix be sure they keeps on steadily to work well with precisely to the haul this is certainly very long.
Application of Solar Bypass Diodes
Since solars bypass diodes are critical elements for solar powered energy systems to execute effectively, they're typically present in virtually all types of solars panels systems and applications. Solar technology driven with bypass diodes make sure it is easy for homeowners to generate panel which are solar areas that may be shaded that will get reduced degrees of sunshine. Solar technology panels with bypass diodes improve the performance, reliability, and protection of solar technology systems.
Solars bypass diodes provides an elements that is vital photovoltaic systems and maybe happens extremely important to solars abilities systems' durabilities. Its actively works to keep electricity going between cells and solars powers systems, increasing effectiveness and preventing voltages changes. The security solar panel bypass diode bring to panel solars causes to an components essentials into account when selecting a panels system solars.
Source: https://www.sdoenergy.com/application/bypass-diode | mithokha_saderha_c6bb89ea | |
1,889,179 | Streamlining Your Software Delivery with AWS CodePipeline | Streamlining Your Software Delivery with AWS CodePipeline In today's fast-paced software... | 0 | 2024-06-15T03:02:14 | https://dev.to/virajlakshitha/streamlining-your-software-delivery-with-aws-codepipeline-3i2l | 
# Streamlining Your Software Delivery with AWS CodePipeline
In today's fast-paced software development landscape, delivering high-quality applications at speed is paramount. This necessitates a robust and automated Continuous Integration and Continuous Delivery (CI/CD) pipeline. AWS CodePipeline steps in as a fully managed service that empowers you to model, visualize, and automate the steps involved in releasing your software.
### Introduction to AWS CodePipeline
At its core, AWS CodePipeline is a service designed to orchestrate your software release processes. It allows you to define a series of stages, each encompassing distinct actions, through which your code progresses from source control to production. This structured approach ensures consistent and repeatable deployments, minimizing manual errors and accelerating your time to market.
### Key Components of AWS CodePipeline:
* **Pipeline**: Think of this as the overarching workflow defining the entire release process. It acts as a container for all your stages and actions.
* **Stage**: Each pipeline is broken down into logical stages representing different phases of your release process, such as Source, Build, Test, and Deploy.
* **Action**: Within each stage, you have individual actions that represent the specific tasks performed. These actions can interact with a multitude of AWS services and third-party tools.
Now, let's delve into the practical applications of AWS CodePipeline by exploring various use cases:
### Use Cases of AWS CodePipeline
1. **Automating Deployments to Amazon EC2 Instances**
Imagine you have an application running on Amazon EC2 instances. With CodePipeline, you can automate the entire process of deploying new code changes to these instances. Here's how:
* **Source Stage**: Your pipeline is triggered whenever new code is pushed to your source control repository, be it AWS CodeCommit, GitHub, or Bitbucket.
* **Build Stage**: CodePipeline can integrate seamlessly with build tools like AWS CodeBuild or Jenkins. This stage compiles your code, runs unit tests, and packages your application into deployable artifacts.
* **Test Stage**: Ensure the quality of your releases by incorporating automated testing. This stage might involve deploying your application to a staging environment and running integration tests or end-to-end tests.
* **Deploy Stage**: Once your code passes all tests, this stage handles deploying your application to the EC2 instances. CodeDeploy can be utilized to automate this deployment, ensuring zero downtime for your users.
2. **Serverless Deployments with AWS Lambda**
For serverless applications leveraging AWS Lambda, CodePipeline offers a streamlined deployment process:
* **Source Stage**: Similar to the previous use case, code changes in your repository trigger the pipeline.
* **Build Stage**: AWS CodeBuild or AWS Lambda can be employed to package your serverless functions and prepare them for deployment.
* **Deploy Stage**: CodePipeline seamlessly integrates with AWS SAM (Serverless Application Model) or the AWS Serverless Application Repository, enabling you to deploy your Lambda functions and associated resources with ease.
3. **Continuous Delivery for Mobile Applications**
Developing and releasing mobile applications poses unique challenges that CodePipeline can address effectively:
* **Source Stage**: Changes to your mobile app's codebase, whether for iOS or Android, initiate the pipeline.
* **Build Stage**: Utilize AWS CodeBuild or dedicated mobile build services to compile your code and generate the application binaries.
* **Test Stage**: Implement automated UI tests, unit tests, and integration tests using frameworks like Appium or Espresso. This stage ensures your app's functionality and user experience meet the required standards.
* **Deploy Stage**: CodePipeline can integrate with services like AWS Device Farm to distribute your app to beta testers or publish it to app stores like Apple App Store or Google Play Store.
4. **Infrastructure as Code (IaC) with AWS CloudFormation**
CodePipeline extends its capabilities to infrastructure management using tools like AWS CloudFormation:
* **Source Stage**: Store your CloudFormation templates in a version control system like CodeCommit. Changes to these templates trigger the pipeline.
* **Review Stage**: Incorporate a manual approval stage if desired, allowing for code reviews or security checks before infrastructure changes are applied.
* **Deploy Stage**: CodePipeline uses CloudFormation to create, update, or delete AWS resources based on the templates in your repository.
5. **Blue/Green Deployments for High Availability**
For mission-critical applications demanding minimal downtime, CodePipeline facilitates blue/green deployments:
* **Source and Build Stages**: Similar to previous examples, these stages handle code changes and building the application.
* **Deploy to Green Environment**: The pipeline first deploys the updated application to a separate, identical environment (the "Green" environment).
* **Testing and Validation**: Thorough testing is performed on the Green environment to ensure everything functions as expected.
* **Route Traffic to Green**: Once validated, traffic is gradually shifted from the existing "Blue" environment to the "Green" environment using load balancers.
* **Monitor and Rollback**: The pipeline continuously monitors the new environment. If any issues arise, traffic can be swiftly reverted to the Blue environment.
### Alternative CI/CD Solutions
While AWS CodePipeline excels in the AWS ecosystem, it's worth noting other prominent CI/CD tools available:
* **Jenkins**: A widely-adopted open-source automation server offering extensive plugin support for various tools and platforms.
* **GitHub Actions**: Tightly integrated with GitHub repositories, it provides a comprehensive CI/CD solution within the GitHub platform.
* **GitLab CI/CD**: Part of the GitLab ecosystem, this tool offers robust features for CI/CD, including built-in container registry and Kubernetes integration.
* **Azure DevOps**: Microsoft's comprehensive suite for development and deployment, including Pipelines for CI/CD.
### Conclusion
AWS CodePipeline provides a powerful and flexible framework for orchestrating your software delivery processes. Its tight integration with other AWS services, along with support for third-party tools, makes it an ideal choice for teams looking to automate and accelerate their software releases while maintaining high quality and reliability. Whether you're deploying to EC2 instances, embracing serverless architectures, or managing mobile applications, CodePipeline offers a comprehensive solution to streamline your CI/CD workflows.
### Advanced Use Case: Multi-Region Deployment with Canary Releases
**Scenario:** Imagine a global application requiring high availability and gradual rollouts of new features to minimize risks. This is where a multi-region deployment strategy combined with canary releases, orchestrated by CodePipeline, shines.
**Architecture:**
1. **CodePipeline Setup:**
* The pipeline is triggered by code changes pushed to the main branch of your repository.
* A CodeBuild project compiles the code, runs unit tests, and packages the application into Docker images. These images are then pushed to Amazon ECR (Elastic Container Registry).
2. **Multi-Region Deployment:**
* Using CloudFormation or Terraform (managed through CodePipeline), create identical environments in multiple AWS regions (e.g., us-east-1, eu-west-1). Each environment should include:
* An ECS (Elastic Container Service) cluster.
* An Application Load Balancer (ALB).
* Auto Scaling groups for your ECS tasks.
* Amazon RDS databases (if applicable).
3. **Canary Release Strategy:**
* CodePipeline first deploys the new application version to a small percentage of ECS tasks in one region.
* Real-time monitoring tools like Amazon CloudWatch are employed to observe the new version's performance and stability.
* If no issues are detected, CodePipeline gradually increases the traffic routed to the new version while simultaneously deploying it to a small percentage of tasks in another region.
* This process continues iteratively, slowly shifting traffic and expanding to new regions, until the new version serves 100% of the traffic.
4. **Rollback Mechanism:**
* At any stage, if monitoring detects anomalies, CodePipeline can automatically roll back the deployment.
* Traffic is redirected back to the previous stable version, minimizing user impact.
**Benefits:**
* **Zero Downtime Deployments:** By routing traffic gradually, users experience no interruptions during updates.
* **Reduced Risk:** Canary releases allow you to test new versions with real user traffic but in a controlled manner, minimizing the impact of potential issues.
* **Improved Fault Tolerance:** Multi-region deployments enhance availability. If one region experiences an outage, traffic can be routed to other healthy regions.
* **Gradual Feature Rollouts:** This approach enables you to test new features with a subset of users and gather feedback before a full-scale release.
By leveraging the power of CodePipeline in conjunction with other AWS services, you can create sophisticated deployment pipelines that meet the demands of even the most complex applications, ensuring high availability, low risk, and continuous delivery of value to your users.
| virajlakshitha | |
1,889,178 | Building Reactive Microservices: A Step-by-Step Guide | From Monolith to Microservices: A Reactive Approach Transitioning from a monolithic... | 0 | 2024-06-15T03:00:49 | https://dev.to/tutorialq/building-reactive-microservices-a-step-by-step-guide-1jha | java, reactive, microservices, reactivemicrosoft | ### From Monolith to Microservices: A Reactive Approach
Transitioning from a monolithic architecture to microservices is a significant step for any organization. Reactive microservices offer a way to build highly responsive, resilient, and scalable applications. This guide will walk you through the process of transforming a monolithic application into a set of reactive microservices using the latest version of Java.
### Why Reactive Microservices?
Reactive microservices leverage reactive programming principles to handle high concurrency, provide resilience, and ensure scalability. Key benefits include:
1. **Responsiveness**: By handling requests asynchronously, reactive microservices provide quick responses even under heavy load.
2. **Resilience**: Reactive systems isolate failures and recover gracefully.
3. **Scalability**: Non-blocking operations enable better resource utilization, allowing systems to scale efficiently.
### Step 1: Understanding the Monolith
Before breaking down the monolith, it’s essential to understand its structure. A typical monolithic application has a single codebase with tightly coupled components.
```java
public class MonolithicApp {
public static void main(String[] args) {
UserService userService = new UserService();
OrderService orderService = new OrderService(userService);
Order order = orderService.createOrder("user123", "product456");
System.out.println(order);
}
}
```
### Step 2: Identify Microservice Candidates
Analyze the monolithic application to identify components that can be separated into individual microservices. Common candidates include user management, order processing, and inventory management.
### Step 3: Design the Microservices
#### Domain-Driven Design (DDD)
Use Domain-Driven Design (DDD) principles to identify and model the core domains and subdomains of your application. Each microservice should align with a specific domain or subdomain, encapsulating its own business logic and data.
**Example:**
1. **User Service**: Manages user accounts and profiles.
2. **Order Service**: Handles order creation, processing, and management.
3. **Product Service**: Manages product catalog and inventory.
### Step 4: Implement Reactive Programming Principles
#### User Service Example
Using Spring WebFlux, we can build a reactive User Service. WebFlux is built on Project Reactor, which provides a powerful and flexible reactive programming model.
**User Model and Service Implementation**
The User model is a simple POJO (Plain Old Java Object) representing the user entity. The UserService class manages the lifecycle of User objects in a concurrent hash map.
```java
// User.java
public class User {
private String id;
private String name;
// getters and setters
}
// UserService.java
@Service
public class UserService {
private final Map<String, User> users = new ConcurrentHashMap<>();
public Mono<User> getUserById(String id) {
return Mono.justOrEmpty(users.get(id));
}
public Mono<User> createUser(User user) {
users.put(user.getId(), user);
return Mono.just(user);
}
}
```
**User Controller**
The UserController class handles HTTP requests and interacts with the UserService. It leverages the reactive capabilities of Spring WebFlux to return `Mono` objects, which represent a single asynchronous value.
```java
// UserController.java
@RestController
@RequestMapping("/users")
public class UserController {
private final UserService userService;
public UserController(UserService userService) {
this.userService = userService;
}
@GetMapping("/{id}")
public Mono<ResponseEntity<User>> getUser(@PathVariable String id) {
return userService.getUserById(id)
.map(ResponseEntity::ok)
.defaultIfEmpty(ResponseEntity.notFound().build());
}
@PostMapping
public Mono<User> createUser(@RequestBody User user) {
return userService.createUser(user);
}
}
```
**Application Entry Point**
The main application class is annotated with `@SpringBootApplication`, which triggers component scanning and auto-configuration.
```java
// Application.java
@SpringBootApplication
public class UserServiceApplication {
public static void main(String[] args) {
SpringApplication.run(UserServiceApplication.class, args);
}
}
```
#### Order Service Example
The Order Service will interact with the User Service asynchronously using WebClient, a reactive web client included in Spring WebFlux.
**Order Model and Service Implementation**
The Order model represents an order entity. The OrderService class uses WebClient to make non-blocking HTTP requests to the User Service to retrieve user information.
```java
// Order.java
public class Order {
private String orderId;
private String userId;
private String productId;
// getters and setters
}
// OrderService.java
@Service
public class OrderService {
private final WebClient webClient;
public OrderService(WebClient.Builder webClientBuilder) {
this.webClient = webClientBuilder.baseUrl("http://localhost:8080").build();
}
public Mono<Order> createOrder(String userId, String productId) {
return webClient.get()
.uri("/users/{id}", userId)
.retrieve()
.bodyToMono(User.class)
.map(user -> {
Order order = new Order();
order.setUserId(user.getId());
order.setProductId(productId);
order.setOrderId(UUID.randomUUID().toString());
return order;
});
}
}
```
**Order Controller**
The OrderController class handles HTTP requests and interacts with the OrderService to process orders.
```java
// OrderController.java
@RestController
@RequestMapping("/orders")
public class OrderController {
private final OrderService orderService;
public OrderController(OrderService orderService) {
this.orderService = orderService;
}
@PostMapping
public Mono<Order> createOrder(@RequestParam String userId, @RequestParam String productId) {
return orderService.createOrder(userId, productId);
}
}
// Application.java
@SpringBootApplication
public class OrderServiceApplication {
public static void main(String[] args) {
SpringApplication.run(OrderServiceApplication.class, args);
}
}
```
### Step 5: Implement Inter-Service Communication
Reactive microservices often need to communicate with each other. We use WebClient in Spring WebFlux for non-blocking HTTP requests.
```java
@Bean
public WebClient.Builder webClientBuilder() {
return WebClient.builder();
}
```
### Step 6: Handle Backpressure and Resilience
Implement backpressure to handle scenarios where the producer is faster than the consumer. Use Project Reactor’s `Flux` and `Mono` to manage data flow and resilience.
#### Circuit Breaker
Use Resilience4j to implement a circuit breaker, ensuring that your services can gracefully handle failures.
```java
// OrderService.java
@Service
public class OrderService {
private final WebClient webClient;
private final CircuitBreaker circuitBreaker;
public OrderService(WebClient.Builder webClientBuilder, CircuitBreakerRegistry circuitBreakerRegistry) {
this.webClient = webClientBuilder.baseUrl("http://localhost:8080").build();
this.circuitBreaker = circuitBreakerRegistry.circuitBreaker("userService");
}
public Mono<Order> createOrder(String userId, String productId) {
return Mono.fromCallable(() -> circuitBreaker.executeSupplier(() ->
webClient.get()
.uri("/users/{id}", userId)
.retrieve()
.bodyToMono(User.class)
.block()))
.map(user -> {
Order order = new Order();
order.setUserId(user.getId());
order.setProductId(productId);
order.setOrderId(UUID.randomUUID().toString());
return order;
});
}
}
```
### Step 7: Deploy and Monitor
Deploy your microservices using container orchestration platforms like Kubernetes. Implement monitoring to track the health and performance of your services.
#### Monitoring with Micrometer and Prometheus
```java
// Add dependencies for micrometer and prometheus
dependencies {
implementation 'io.micrometer:micrometer-core'
implementation 'io.micrometer:micrometer-registry-prometheus'
}
// Application.java
@SpringBootApplication
public class MonitoringApplication {
public static void main(String[] args) {
SpringApplication.run(MonitoringApplication.class, args);
}
}
```
### Advanced Topics
#### Event-Driven Architecture
Reactive microservices often benefit from event-driven architecture, where services communicate through events rather than direct HTTP calls. This decouples services, allowing for greater flexibility and scalability.
**Example: Using Kafka for Event-Driven Communication**
```java
// KafkaProducerConfig.java
@Configuration
public class KafkaProducerConfig {
@Bean
public ProducerFactory<String, Order> producerFactory() {
Map<String, Object> configProps = new HashMap<>();
configProps.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, "localhost:9092");
configProps.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, StringSerializer.class);
configProps.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, JsonSerializer.class);
return new DefaultKafkaProducerFactory<>(configProps);
}
@Bean
public KafkaTemplate<String, Order> kafkaTemplate() {
return new KafkaTemplate<>(producerFactory());
}
}
// KafkaConsumerConfig.java
@Configuration
public class KafkaConsumerConfig {
@Bean
public ConsumerFactory<String, Order> consumerFactory() {
Map<String, Object> configProps = new HashMap<>();
configProps.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, "localhost:9092");
configProps.put(ConsumerConfig.GROUP_ID_CONFIG, "group_id");
configProps.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, StringDeserializer.class);
configProps.put(ConsumerConfig.VALUE_DES
ERIALIZER_CLASS_CONFIG, JsonDeserializer.class);
configProps.put(JsonDeserializer.TRUSTED_PACKAGES, "*");
return new DefaultKafkaConsumerFactory<>(configProps);
}
@Bean
public ConcurrentKafkaListenerContainerFactory<String, Order> kafkaListenerContainerFactory() {
ConcurrentKafkaListenerContainerFactory<String, Order> factory = new ConcurrentKafkaListenerContainerFactory<>();
factory.setConsumerFactory(consumerFactory());
return factory;
}
}
// OrderProducer.java
@Service
public class OrderProducer {
private final KafkaTemplate<String, Order> kafkaTemplate;
public OrderProducer(KafkaTemplate<String, Order> kafkaTemplate) {
this.kafkaTemplate = kafkaTemplate;
}
public void sendOrder(Order order) {
kafkaTemplate.send("orders", order);
}
}
// OrderConsumer.java
@Service
public class OrderConsumer {
@KafkaListener(topics = "orders", groupId = "group_id")
public void consume(Order order) {
System.out.println("Consumed order: " + order);
}
}
```
### Design Patterns and Best Practices
#### 1. Single Responsibility Principle (SRP)
Each microservice should have a single responsibility, encapsulating a specific business capability. This promotes maintainability and scalability.
#### 2. Circuit Breaker Pattern
Use the circuit breaker pattern to prevent cascading failures and allow the system to recover gracefully. This is particularly important in a distributed environment where services depend on each other.
```java
// OrderService.java
@Service
public class OrderService {
private final WebClient webClient;
private final CircuitBreaker circuitBreaker;
public OrderService(WebClient.Builder webClientBuilder, CircuitBreakerRegistry circuitBreakerRegistry) {
this.webClient = webClientBuilder.baseUrl("http://localhost:8080").build();
this.circuitBreaker = circuitBreakerRegistry.circuitBreaker("userService");
}
public Mono<Order> createOrder(String userId, String productId) {
return Mono.fromCallable(() -> circuitBreaker.executeSupplier(() ->
webClient.get()
.uri("/users/{id}", userId)
.retrieve()
.bodyToMono(User.class)
.block()))
.map(user -> {
Order order = new Order();
order.setUserId(user.getId());
order.setProductId(productId);
order.setOrderId(UUID.randomUUID().toString());
return order;
});
}
}
```
#### 3. Event Sourcing
Event sourcing is a design pattern where state changes are logged as a sequence of events. This allows for a full history of state changes, making it easy to recreate the state at any point in time.
```java
// EventStore.java
public class EventStore {
private final List<Event> events = new ArrayList<>();
public void save(Event event) {
events.add(event);
}
public List<Event> getEvents() {
return new ArrayList<>(events);
}
}
```
#### 4. CQRS (Command Query Responsibility Segregation)
CQRS is a pattern that separates the responsibility of handling commands (writes) and queries (reads). This separation allows for more scalable and maintainable systems.
```csharp
// C# example using CQRS
public class Command {
public string Data { get; set; }
}
public class Query {
public string Criteria { get; set; }
}
public interface ICommandHandler<T> {
void Handle(T command);
}
public interface IQueryHandler<T, R> {
R Handle(T query);
}
public class CommandHandler : ICommandHandler<Command> {
public void Handle(Command command) {
// Handle the command
}
}
public class QueryHandler : IQueryHandler<Query, string> {
public string Handle(Query query) {
// Handle the query and return result
return "Result";
}
}
```
#### 5. Saga Pattern
The Saga pattern is a way to manage distributed transactions across multiple services. It breaks down a transaction into a series of smaller steps, each managed by a service, with compensating transactions to handle failures.
**Example:**
1. **Order Service**: Starts the saga by creating an order.
2. **Inventory Service**: Reserves product inventory.
3. **Payment Service**: Processes payment.
4. **Order Service**: Finalizes the order.
If any step fails, compensating transactions are triggered to roll back the changes.
### Conclusion
Building reactive microservices involves understanding reactive principles, decoupling components, and ensuring resilience and scalability. By transitioning from a monolith to a reactive microservices architecture, you can create applications that are better suited to handle the demands of modern, high-concurrency environments. This guide provides a foundation for building such systems using the latest version of Java and reactive programming frameworks. Embracing reactive programming can significantly enhance the performance, maintainability, and responsiveness of your applications. | tutorialq |
1,889,176 | Custom Software Development: Investing in Long-Term Business Growth | We all use software every day. No matter the business or industry, software is just part of the world... | 0 | 2024-06-15T02:57:05 | https://dev.to/aaronsmithcs/custom-software-development-investing-in-long-term-business-growth-28bm | software, development, webdev | We all use software every day. No matter the business or industry, software is just part of the world now. Most businesses use standardized, off-the-shelf tools for many tasks. Microsoft and Google products are so prolific that the average person is expected to have familiarity with them.
Yet, such generalized tools don’t always provide the best options for every place of business. As an example, what if you need specialized [data integration software](https://www.pellsoftware.com/systems-integrations/)? You can try to make an off-the-shelf solution work, but you have another option entirely. You can invest in custom software.
Custom software development offers many advantages and opportunities, and when you understand them, it’s easy to see how they can contribute to long-term business growth.
**Saving Money Over Time**
From a business standpoint, [custom software](https://en.wikipedia.org/wiki/Custom_software) is only justifiable if it improves the bottom line in some meaningful way.
When you compare custom software to off-the-shelf options, a few points come to the forefront. First, custom software typically represents a single investment. You pay the developer(s) to make the software, and that’s it.
Meanwhile, off-the-shelf solutions often come with monthly fees, upgrade costs, and ongoing expenses. Over time, those add up and eclipse the raw financial investment needed for custom software.
On top of that, security and maintenance for custom solutions typically cost less. Because custom software is not widely available, it’s less likely that malicious parties will find vulnerabilities to exploit. Thus, it’s safer, and that safety can save a lot of money over time too.
**Better Integration**
Unless you buy into an entire off-the-shelf ecosystem, you’re going to find clunky integration at best. Sure, some things will work together, but others won’t.
One of the primary motivators for custom software is deliberate integration. You can tell the developers what software you use and how, and they can plan, from the beginning, how to integrate the new software with your existing staples.
You can and should expect seamless integration, and you can expect for this integration to further improve the value of your custom software. After all, it provides new solutions without inhibiting your use of older solutions.
**Planned Scalability**
Along those same lines, planning custom software from the beginning allows for better [scalability strategies](https://www.investopedia.com/terms/s/scalability.asp). When you stick with off-the-shelf options, scalability usually exists, but you have to buy into increasingly expensive support tiers as you grow.
Custom software gives you more control over your own scalability. If you use in-house servers and resources for most of your scalability, the custom software can simply expand with your hardware.
If you’re planning to buy into cloud support, then the custom software developer can design around that as well. Naturally, various combinations of scalability can all fit into the custom design process.
The point is that your software developer is intentionally building around your existing scalability strategy.
**Improve Workflows**
Arguably the most powerful advantage of custom software lives in improved workflows. Custom software can automate tasks that waste time and don’t really benefit from human input — such as data entry. It can also streamline communication and resource allocation.
It can also address specific bottlenecks in your workflows to reduce the amount of time, energy, and labor you put into some of the most common tasks in your workplace.
This makes your workflows more efficient and more valuable, ultimately improving the ROI on labor investments. Leveraged correctly, custom software can make it more profitable to expand your labor force and accelerate growth timelines.
**Custom Features**
While this concept does live in the very name of custom software, it’s worth exploring as an individual advantage. You can get custom features built into your software that specifically suit your organization and how you do things.
This often makes custom software more intuitive and easier to use. It also means you have the technological ability to carry out specific tasks in the manner of your choosing. Custom features can help with any aspect of your processes, from customized search engines to business-specific autofill features.
Custom features make up an essential element of software that perfectly fits your business.
**Ownership**
Custom software is yours. If you outsource development, [licensing agreements](https://dev.to/lanars_inc/custom-software-development-contract-how-to-sign-agreements-with-vendors-2lce) might vary, but the developer is making the software specifically for you. You get to negotiate how it gets maintained. You can outright own it.
Sure, this prevents you from paying monthly fees just for access to your own software, but ownership extends further.
You have more power and flexibility in how you use your software over time. You’re not at the mercy of an outsourced customer service call center that doesn’t really understand your business. If you want new features or updates, you can commission them.
The ability to direct the life of your software allows you to continue to extract value from it even as your business evolves.
**Professional Relationships**
The establishment of professional relationships creates value that is difficult to quantify. Ultimately, someone has to build your custom software. That someone becomes an effective business partner. They learn about your business in order to build the software, and they are invested in your success through this relationship. As an outsider vested in your success, they may offer fresh perspectives for further improving productivity.
The software developer becomes a professional resource that you can count on in the future, especially if you have additional custom software needs. You can reach out to them for professional advice, planning, and development projects.
| aaronsmithcs |
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 | terry_woodly_b18d9eeb0ade | |
1,889,174 | 1.1 - Um primeiro programa simples | Programa Java Simples: - Descrição: Programa básico em Java que exibe uma mensagem no console. - Nome... | 0 | 2024-06-15T02:45:54 | https://dev.to/devsjavagirls/11-um-primeiro-programa-simples-5ah2 | java | **Programa Java Simples:**
**- Descrição:** Programa básico em Java que exibe uma mensagem no console.
**- Nome do Arquivo:** Deve ser "Example.java" para corresponder à classe principal "Example".
**Passos para Compilar e Executar:**
**- Inserindo o Programa:**
Use um editor de texto simples, como WordPad no Windows, para evitar formatação adicional que pode confundir o compilador.
**- Compilando o Programa:**
Utilize o comando javac Example.java no prompt de comando para compilar o arquivo "Example.java" e gerar o bytecode "Example.class".
- Executando o Programa:
Utilize o comando java Example para executar o programa Java. Isso imprimirá a mensagem "Java drives the Web." no console.
**- Estrutura do Programa:**
Comentários: Incluídos para documentação e devem começar com /* e terminar com */.
**- Definição de Classe:**
Começa com class Example { e termina com }. Todo o código Java deve estar dentro de uma classe.
**Método main(String args[]):**
Declaração pública (public) e estática (static), permitindo o início da execução do programa.
Retorna void, indicando que não retorna valor.
**String args[]:** Parâmetro que pode receber argumentos da linha de comando, mas não é utilizado neste exemplo.
Sistema de Saída (System.out.println):
Método usado para imprimir "Java drives the Web." seguido de uma nova linha no console.
- Detalhes de Compilação e Erros de Sintaxe:
Todos os arquivos .java devem ser compilados para bytecode .class antes da execução.
Erros de sintaxe são reportados pelo compilador e devem ser corrigidos para compilar e executar o programa corretamente.
| devsjavagirls |
1,889,173 | From Concept to Completion: The Journey of a Kitchenware Production Line | From ideas to Reality: the whole information of how Kitchenware Production Lines Come to Life Have... | 0 | 2024-06-15T02:41:41 | https://dev.to/mithokha_saderha_c6bb89ea/from-concept-to-completion-the-journey-of-a-kitchenware-production-line-4di6 |
From ideas to Reality: the whole information of how Kitchenware Production Lines Come to Life
Have actually your become enthusiastic about precisely how kitchen area which are picked region are manufactured? Why don't we take a look that is good the journey associated with the kitchenware production line, from concept to summary.
Great things about Kitchenware Production Lines
Kitchenware Production Line value that is offering many product which was handmade. First, they might produce a amount that are larger of, top-quality facts. This implies you need to anticipate every item to positively read plus work exactly the same, each time. second, manufacturing lines often use particular products which will undertake operate better compared to worker which are typical try individual. This allows for quicker production circumstances plus costs which are paid off.
Innovation in Kitchenware Production Lines
Innovation is a aspect that are key of Kitchenware Production Line. Developers is continually wanting current ways to enhance products which was present create society that can be totally unique. A typical example of innovation in kitchenware production line may be the use of non-stick coatings. These coatings render cleansing plus cooking convenient, nonetheless they might require furthermore items that is certain usage. Manufacturing lines need really modified because of this want and can now make use of coatings which could frequently feel plus that is non-stick.
Safety Features of Kitchenware Production Lines
Protection is a concern that was Kitchenware Production Line. The apparatus present in production lines could be dangerous if possibly you do not properly maintained plus supervised. To prevent accidents, manufacturing lines use security precautions hurdles, sensors, plus crisis stops. Workers is likewise taught to perform the gear properly plus they are motivated to report any protection dilemmas.
How to Use Kitchenware Production Line
Kitchenware Production Line are created to being effortless plus practical to utilize. Services provide directions on the best way to utilize product precisely plus effortlessly. The principles could simply let you know just how to properly link the blades, what types of greens to make use of, plus how to totally wash it later on for example, if you're using a home that is new, as being a veggie spiralizer.
Kitchenware Product Application
Kitchenware Production Line has applications that are many. As an example, you may be enabled by the blade to chop vegetables, part bread, as carve the roast. You're enabled by the saucepan to give soup, boil pasta, because melt chocolate. Different product have actually cool properties which will make them most useful suited to work which was certain. The non-stick pan that are frying perfect for cooking eggs since they can maybe not stick to the external liner for instance.
Quality plus Service kitchen appliance production line
Provider plus quality are foundational to components of kitchenware production lines. Services pride on their own on creating things that was customers which are top-quality expect. Quality things aren't simply durable but in addition look plus feel near to use. Near client care are important which also you vow customer support. Should your customer comes with a matter because concern of the product, services could significantly simply be located to help with customer service channels email, phone, because talk that are real-time.
Kitchenware production lines PRODUCT are where in fact the key does occur! They function a few importance, use technology that are revolutionary best things, prioritize safety, produce clear instructions along the way which is most beneficial to make utilization of things, has collection of applications, plus stress quality plus service to be sure customer happiness. The event which are next are employing their cooking area that are favorite device take care to understand the journey it took to acquire right here.
Source: https://www.klt-press.com/Kitchenware-production-line | mithokha_saderha_c6bb89ea | |
1,889,171 | Scope of Practice Restrictions: Navigating Legal and Regulatory Boundaries in Chiropractic Care with Tom Herchakowski (NJ) | Managing a chiropractic practice comes with its own set of challenges, and one of the most... | 0 | 2024-06-15T02:35:58 | https://dev.to/drtomherchakowski/scope-of-practice-restrictions-navigating-legal-and-regulatory-boundaries-in-chiropractic-care-with-tom-herchakowski-nj-5c5p | Managing a chiropractic practice comes with its own set of challenges, and one of the most significant is navigating the legal and regulatory boundaries that define the scope of chiropractic care. Scope of practice restrictions dictate the extent to which chiropractors can diagnose, treat, and manage various health conditions, and understanding and complying with these regulations is essential for running a successful and compliant practice. In this blog, we will explore the top challenges that chiropractors face in managing their practices within the confines of scope of practice restrictions.
## Diagnosis Limitations
One of the primary challenges in managing a chiropractic practice is the limitation on diagnosing certain health conditions. While chiropractors are trained to assess musculoskeletal disorders and provide spinal adjustments, they may face restrictions in diagnosing conditions outside of their scope of practice, such as internal organ disorders or neurological conditions. This limitation can pose challenges in effectively addressing patient needs and coordinating care with other healthcare providers.
Moreover, navigating the line between assessing musculoskeletal symptoms and diagnosing underlying health issues requires careful communication with patients and collaboration with other healthcare professionals. By establishing clear protocols for patient assessment and referral, chiropractors like Tom Herchakowski (NJ) ensure that patients receive appropriate care while adhering to scope of practice regulations.
## Treatment Modalities
Another challenge in managing a chiropractic practice is the restriction on certain treatment modalities and techniques. While chiropractors are known for spinal adjustments and manual therapy techniques, they may face limitations in offering adjunctive therapies such as acupuncture, physical therapy modalities, or prescription medications. This can limit the range of treatment options available to patients and may require chiropractors to refer patients to other providers for comprehensive care.
Furthermore, staying up-to-date with evolving regulations and licensing requirements for different treatment modalities is essential for maintaining compliance and avoiding legal and regulatory issues. By investing in continuing education and training opportunities, chiropractic professionals such as Tom Herchakowski (NJ) expand their skillset within the confines of scope of practice regulations and enhance the quality of care they provide to patients.
## Insurance Reimbursement
In addition to clinical challenges, managing a chiropractic practice involves navigating complex insurance reimbursement policies and procedures. While chiropractic care is recognized by many insurance companies, reimbursement rates and coverage policies can vary significantly depending on the patient's insurance plan and the specific services rendered. This can create challenges in accurately billing for services and obtaining timely reimbursement for patient care.
Moreover, staying informed about changes in insurance regulations and negotiating favorable reimbursement contracts with insurance companies is crucial for maintaining financial viability and sustainability as a chiropractic practice. By implementing efficient billing and coding practices and advocating for fair reimbursement rates, chiropractors including Tom Herchakowski (NJ) ensure that their practices remain financially viable while providing quality care to patients.
## Interprofessional Collaboration
Interprofessional collaboration is essential for providing comprehensive and coordinated care to patients, but scope of practice restrictions can sometimes hinder collaboration between chiropractors and other healthcare providers. Chiropractors may face challenges in establishing referral networks and collaborating with medical doctors, physical therapists, and other allied health professionals due to differences in scope of practice and treatment philosophies.
Furthermore, building trust and rapport with other healthcare providers requires effective communication and mutual respect for each other's expertise and contributions to patient care. By fostering open communication channels and establishing professional relationships with other providers, chiropractic professionals like Tom Herchakowski (NJ) overcome barriers to collaboration and ensure that patients receive holistic care that addresses their unique needs and preferences.
## Patient Education and Informed Consent
Educating patients about the scope of chiropractic care and obtaining informed consent for treatment are essential aspects of managing a chiropractic practice. Patients may have misconceptions about what chiropractic care entails or may not fully understand the limitations of chiropractic treatment for certain health conditions. This can create challenges in managing patient expectations and ensuring that patients make informed decisions about their care.
Moreover, obtaining informed consent involves explaining the risks, benefits, and alternatives of chiropractic treatment options to patients in a clear and understandable manner. This requires effective communication skills and the ability to address patient concerns and questions about their care. By prioritizing patient education and informed consent, chiropractors can empower patients to take an active role in their health and well-being and foster trusting relationships built on transparency and mutual respect.
## Regulatory Compliance
Compliance with legal and regulatory requirements is paramount for managing a chiropractic practice and avoiding potential legal and disciplinary issues. Chiropractors must adhere to state licensing laws, scope of practice regulations, and professional standards of practice set forth by regulatory bodies such as state chiropractic boards and professional associations. This includes maintaining accurate patient records, ensuring patient confidentiality, and adhering to ethical guidelines for advertising and marketing.
Furthermore, staying abreast of changes in laws and regulations that affect chiropractic practice and implementing policies and procedures to ensure compliance is essential for mitigating legal and regulatory risks. By investing in compliance training and resources, chiropractors such as Tom Herchakowski (NJ) protect their practices from potential liabilities and uphold the integrity and reputation of the profession.
Navigating scope of practice restrictions is a significant challenge in managing a chiropractic practice, requiring chiropractors to understand and comply with legal and regulatory boundaries while providing quality care to patients. By addressing challenges such as diagnosis limitations, treatment modalities, insurance reimbursement, interprofessional collaboration, patient education, and regulatory compliance, chiropractors can overcome barriers to practice success and ensure that their practices thrive in an ever-changing healthcare landscape. By staying informed, adaptable, and committed to ethical practice, chiropractors can navigate scope of practice restrictions effectively and uphold the highest standards of patient care and professionalism in the field of chiropractic medicine.
| drtomherchakowski | |
1,889,170 | Iron IPTV Pro | Dans l’ère actuelle où la technologie révolutionne chaque aspect de notre vie quotidienne, le... | 0 | 2024-06-15T02:35:52 | https://dev.to/aboprotv/iron-iptv-pro-in0 | Dans l’ère actuelle où la technologie révolutionne chaque aspect de notre vie quotidienne, le divertissement n’est pas en reste. Avec l’émergence de plateformes de streaming, la télévision sur Internet est devenue la norme pour de nombreux foyers à travers le monde. Parmi les innombrables options disponibles, une se distingue par sa qualité, sa fiabilité et sa richesse de contenu : [Iron IPTV](https://abonnementiptv.ma/produit/iron-iptv-pro/
Iron IPTV représente bien plus qu’une simple plateforme de streaming ; c’est une porte ouverte sur un monde infini de divertissement. Mais qu’est-ce qui distingue Iron IPTV des autres fournisseurs de services IPTV ? C’est ce que nous allons explorer.
Tout d’abord, la qualité du contenu. Iron IPTV offre une sélection diversifiée de chaînes de télévision, allant des chaînes locales aux chaînes internationales, couvrant une gamme de thématiques allant des sports aux actualités en passant par le divertissement. Cette variété garantit que chacun trouve son bonheur, quel que soit son intérêt.
Ensuite, la fiabilité. Rien de plus frustrant que de subir des interruptions constantes ou des temps de chargement interminables lorsqu’on essaie de regarder son émission préférée. Avec Iron IPTV, la fiabilité est une priorité. Grâce à une infrastructure robuste et à des technologies de diffusion de pointe, les abonnés peuvent profiter de leur contenu sans interruption, quel que soit l’endroit où ils se trouvent. | aboprotv | |
1,889,169 | Maximizing Output: Strategies for Optimizing Kitchen Appliance Production Lines | Maximizing Manufacturing: Practices for Optimizing Kitchen Appliance Production Lines Wanna cook... | 0 | 2024-06-15T02:35:36 | https://dev.to/mithokha_saderha_c6bb89ea/maximizing-output-strategies-for-optimizing-kitchen-appliance-production-lines-3k07 |
Maximizing Manufacturing: Practices for Optimizing Kitchen Appliance Production Lines
Wanna cook like a specialist? Attaining cooking that are seamless throughout the great things about your home never ever be smoother. As a consequence of kitchen area that are advanced, cooking is now an task which was effortless all. Nonetheless, in the marketplace that are competitive of products, innovation plus quality are becoming essential. Their due to this good reason which appliances lines which can be manufacturing optimize their manufacturing by optimizing their methods. This short article which was informative to your global world of appliances manufacturing lines plus explores means and this can be applied to enhance their effectiveness.
Top features of Optimizing Kitchen Appliance Production Lines
When the applying production lines Optimizing kitchen appliance production line, they've been prone to enjoy value being various. These advantages incorporate improved protection, high quality control, organized use, efficient service, and reduced spending. Most importantly, the optimization connected with production lines helps you to make certain that the safeguards connected with employees test upheld with the production procedure which are whole. In those days that has been quality which are exact measures that are same sure that the end-product fulfills the clients' specs plus specifications, optimization strategies be sure that devices for your kitchen are actually simple to use plus web site. In essence, optimization enables lines being manufacturing create gear that are top-notch are not well efficient but in addition fairly affordable.
Innovation Optimizing Kitchen Appliance Production Lines
Innovation plays an operating task which will be kitchen area appliance company that is vital. Consumers tend to be wanting the present day plus a total large amount of products and this can be higher level the market. It truly is using this reason why are legitimate Optimizing Kitchen Appliance Production Lines. An technique which is not hard is try that is great this is by using cutting-edge technology in the production procedure. This might include robots that are using the construction line because creating products which makes sense might be handled with a product that are mobile online. By combining innovation plus optimization, manufacturing lines will most likely create probably the most efficient products and will also be providing the benefit that has been business which are competitive.
Safety First: Tips for Safe Use of Optimizing Kitchen Appliance Production Lines
While devices for your Optimizing kitchenware production line is creating cooking smoother, they could also feel life-threatening as used precisely. It is very important to you need to the safeguards which will be important to avoid accidents in to the house. Before generally making usage of any appliance, make sure that it is who is fit plus running precisely. It is usually vital to read plus understand the manufacturer's instructions before procedure. Whenever products that are using may be hefty stoves, guarantee there clearly was air that is definitely enough to avoid carbon monoxide poisoning. Finally, usually do not leave food cooking unattended, especially whenever products that are using heating elements.
Have the absolute best from your gear that is own which very own precisely to make use of them effortlessly
Every Optimizing Kitchen Appliance Production Lines area device has functionalities which may be operations being unique. It is very important to grasp using them effectively to stop their potential. Including, whenever using the blender, you should then start slow increase the price gradually to make sure the blend that are smooth. Whenever using the convection number, be sure you utilize the number that's right to avoid overcooking because undercooking the foodstuff, be sure that you discover ways to effortlessly clean the gear, because this will help in prolonging their lifespan.
Service plus Quality: The Bedrock of a exemplary Appliance
Optimizing Kitchen Appliance Production Lines are only the same as their quality plus solutions. Close products like Aluminum pot production line must keep company which will be great their lifespan. It is actually due to this that lines which can be create that is manufacturing that are top-quality can withstand extended utilize, gear includes warranties enabling upkeep solutions in the eventuality of any defects. In case of the disorder in products, you should use specialists that are qualified complete the repairs to avoid escalating the problem.
Optimizing Kitchen Appliance Production Lines produces great pros. Manufacturing lines which use innovation of their optimization achieve the consequence that is top. It is also essential to remember safety need constantly come first whenever residence that has been using, ensuring that particular understands utilising the equipment efficiently plus looking after all of them with servicing plus warranties which are providing that they can endure so long as feasible.
Source: https://www.klt-press.com/Kitchenware-production-line | mithokha_saderha_c6bb89ea | |
1,889,167 | Streamlining Kitchenware Manufacturing: Innovations in Production Line Technology | Streamlining Kitchenware Manufacturing: Innovations in Production Line... | 0 | 2024-06-15T02:28:46 | https://dev.to/mithokha_saderha_c6bb89ea/streamlining-kitchenware-manufacturing-innovations-in-production-line-technology-1m13 |
Streamlining Kitchenware Manufacturing: Innovations in Production Line Technology
Introduction
Streamlining Kitchenware Manufacturing is just a complex plus procedure that are demanding need the application of advanced level quantity line which was manufacturing to generally meet the growing specifications of people regarding quality, safety, plus affordability, we will explore some excellent advantages of streamlining kitchenware production, the modern innovations in manufacturing line tech, plus the way in which they truly are typically helpful to guarantee maximum safeguards, effectiveness, plus quality through the entire series that are incorporate.
Benefits of Streamlining Kitchenware Manufacturing
Streamlining kitchenware properties which are manufacturing benefits that are few beginning with faster manufacturing circumstances to device that is increasing plus quality. To start with, streamlining services services to attenuate invest plus eradicate unneeded actions to your manufacturing procedure. This, in modifications, assists enhance effectiveness, reduced spending, plus enhance profits.
Additionally, kitchenware production line Manufacturing to enhance their responsiveness to advertise needs and remain prior to the competition. Plus faster duration which are manufacturing companies can very quickly build plus deliver what to clients, enhance customer care, plus develop manufacturer commitment.
Innovation in Streamlining Kitchenware Manufacturing
The manufacturing line tech contained in kitchenware production has arrived an means which will be easy have become very long towards the innovations which can be current business. These innovations has revolutionized the manufacturing procedure, rendering it quicker, safer, and much more efficient. A few of the technology that has been contained in kitchenware manufacturing lines add:
1. Robotics plus Automation
Robots plus automation procedures are accustomed to streamline all certain areas of kitchenware manufacturing, from normal product handling to product that is final plus packaging. This technologies helps enhance prices which may be decrease which was manufacturing, plus enhance quality control plus accurate plus operations which is accurate.
2. Quality Management Techniques
Quality administration means are acclimatized to monitor plus get a grip on every duration for the manufacturing procedure, from recycleables to goods that was complete. This tech assists solutions to acknowledge plus lessen defects, lessen spend, plus enhance item quality.
3. Machine Vision
Product eyesight technologies might immediately be used to recognize plus recognize defects in product plus packaging. This tech employs digital cameras, sensors, plus pc software which was pc analyze photos of services and products plus recognize any pressing circumstances that could arise using the manufacturing procedure.
3. Advanced Sensors
Advanced sensors are accustomed to monitor the potency of items, decide malfunctions, plus injuries which are counter. These sensors could decide conditions, force, and also other parameters being making that is critical which could exactly feel particular plus effectively.
Safety plus Use
Safety can be quite a consideration which is Streamlining that is important Kitchenware due to your potential hazards related to using items that decide to try gear that is hefty. The most innovations that are recent manufacturing line technologies has especially best safeguards towards the industry by automating dangerous or play that is replicated by detecting device malfunctions before they take place the accident that will be big.
Also, the usage of robots plus automation means has considerably paid the necessity for individual intervention, minimizing the chances of damage because injuries. Sensor tech allows you to recognize plus alert operators to protection which are feasible, permitting them to do something that are corrective the accident which is major.
How to manufacturing that are incorporate technology
Making use of production line technology in kitchen appliance production line starts plus distinguishing the manufacturing that has been certain within your company. After you have determined the needs you have, you then can artwork plus use the individualized production line that features the technologies which are latest and equipment.
Most of the problem which was key manufacturing that is tech add that has been making use of
one. Identifying effectiveness that was key
2. production that was creating are efficient
3. machinery that are going for would work products
4. Applying safeguards protocols plus treatments
5. starting fix which was progress and this can be regular
Service plus Quality
Generating use of manufacturing line technology in Streamlining Kitchenware Manufacturing is vital to provider which is ensuring happens to be quality that has been people that are maximum. Advanced campaigns being solutions which are monitoring find every phase for the manufacturing procedure, ensuring activities is produced to your item quality directions which are most readily useful plus taken up to people on time.
Additionally, manufacturing line technologies permits service to answer consumer quickly demands, ensuring items was given to areas quicker along with greater determination. This, in modification, improves customer care plus develops maker commitment.
Applications of Manufacturing Line Technology
The applications of manufacturing line technologies in Streamlining Kitchenware Manufacturing is vast plus diverse, beginning with creating domiciles which are everyday like kitchenware like to developing kitchenware that was modified use which are commercial. Essentially the most technology being current in manufacturing lines allows you to be sure that every item was produced for their quality specs which are highest, with maximum effectiveness plus cost-effectiveness.
Streamlining Kitchenware Manufacturing PRODUCT innovations manufacturing that was being does occur technology is crucial on achievements of organizations available. Automation, robotics, good quality management treatments, device vision, in choice high level sensor tech are simply just basically the quantity of current technical advancements which have revolutionized the production procedure in choice guaranteed in full safeguards that maximum, effectiveness, plus quality. Because constantly, companies need certainly to figure the production out requires specific for their operations to produce, incorporate plus keep manufacturing which can be maintaining which meet their efficiency specifications.
Source: https://www.klt-press.com/Kitchenware-production-line | mithokha_saderha_c6bb89ea | |
1,889,157 | Capitulo 1 Fundamentos da linguagem Java | Principais Habilidades e Conceitos - História e Filosofia de Java Conhecer a história e a filosofia... | 0 | 2024-06-15T02:25:31 | https://dev.to/devsjavagirls/cap-1-fundamentos-da-linguagem-java-2ch6 | java | **Principais Habilidades e Conceitos**
**- História e Filosofia de Java**
Conhecer a história e a filosofia da linguagem Java.
- Java foi criada por **James Gosling** e sua equipe na Sun Microsystems em **1991** como uma linguagem independente de plataforma, inicialmente para dispositivos eletrônicos, mas que se destacou ao se tornar a principal linguagem da Internet, devido à sua portabilidade e segurança.
**- Contribuição para a Internet**
Entender como Java contribuiu para o desenvolvimento da Internet.
**- Importância do Bytecode**
Compreender a importância do bytecode na execução de programas Java.
**- Jargão Java**
Familiarizar-se com os termos e jargões específicos de Java.
**- Programação Orientada a Objetos**
Entender os princípios básicos da programação orientada a objetos.
**- Programação Básica**
Criar, compilar e executar um programa Java simples.
**- Uso de Variáveis**
Utilizar variáveis em programas Java.
**- Instruções de Controle**
Usar as instruções de controle if e for.
**- Blocos de Código**
Criar e organizar blocos de código.
**- Sintaxe e Estilo**
Entender como as instruções são posicionadas, recuadas e finalizadas.
**- Palavras-chave Java**
Conhecer as palavras-chave da linguagem Java.
**- Regras dos Identificadores**
Entender as regras de nomenclatura dos identificadores em Java.
**Desenvolvimento da Internet e Java**
**- Impacto da Internet**
A Internet reformulou a computação, transformando PCs isolados em uma rede distribuída.
**- Java na Web**
Java tornou-se a principal linguagem da Internet, revolucionando a programação.
**- Importância de Java**
A habilidade de programar em Java é essencial para programadores profissionais.
**Origem e Evolução da Linguagem Java**
**- Origem de Java**
Desenvolvida na Sun Microsystems em 1991 por James Gosling e outros, inicialmente chamada "Oak".
**- Independência de Plataforma**
Concebida para ser independente de plataforma, Java visava dispositivos eletrônicos domésticos.
**- Influência da Web**
O surgimento da Web mudou o foco de Java para a programação na Internet, destacando-se por sua portabilidade.
**Relação com C e C++**
**- Herança de C/C++**
Java herda sua sintaxe de C e o modelo de objetos de C++.
Facilita a transição para programadores familiarizados com C/C++.
**- Relação com C#**
Similaridades com C#
C# e Java compartilham uma sintaxe similar e suporte à programação distribuída.
Conhecimento de uma linguagem facilita o aprendizado da outra.
**- Contribuições de Java para a Internet**
**- Applets Java**
Pequenos programas que podem ser executados em navegadores, movendo a funcionalidade do servidor para o cliente.
**- Segurança**
Java garante que applets sejam executados de forma segura, confinando-os ao ambiente de execução.
**- Portabilidade**
Java permite que programas sejam executados em diferentes sistemas operacionais e CPUs, graças ao bytecode.
**O Segredo da Linguagem Java: Bytecode**
**- Bytecode**
Instruções otimizadas executadas pela Máquina Virtual Java (JVM).
Facilita a portabilidade e segurança, pois a JVM é adaptada para diferentes plataformas.
**- Compilação Just-in-Time (JIT)**
Melhora o desempenho ao compilar bytecode para código nativo durante a execução, mantendo a portabilidade e segurança.
Pergunte ao especialista
**Ouvi falar de um tipo especial de programa Java chamado servlet. De que se trata?**
Um servlet é um pequeno programa Java executado no servidor.
Servlets estendem dinamicamente a funcionalidade de um servidor Web.
**O jargão Java**
Pergunte ao especialista
**Necessidade de Java para Portabilidade e Segurança**
Java foi criada para resolver problemas de portabilidade e segurança que C++ não podia abordar devido ao uso de ponteiros.
| devsjavagirls |
1,889,164 | Exploring the Cultural Significance of Men's Hats Across the Globe | Looking at Men's Hats Inside The Globe Hats have been around for decades plus ages and they are part... | 0 | 2024-06-15T02:16:36 | https://dev.to/mithokha_saderha_c6bb89ea/exploring-the-cultural-significance-of-mens-hats-across-the-globe-4i53 |
Looking at Men's Hats Inside The Globe
Hats have been around for decades plus ages and they are part which will be crucial of nations internationally. These things being accessory in several designs which can be colors that are various and styles. Males's caps is one of the types being further popular their importance being many. Let us need really an appearance which are enhanced the worthiness which has been social of's caps globally.
Alternatives that are included with Wearing Hats
Males's caps or BUCKET HATS has benefits which can be most like safeguards aided by the sunlight, safeguards against cold temperatures, can also get to be the design declaration. Hats keep consistently the sunlight's harmful rays from exposing your skin which are facial hours that are extended consequently preventing sunburns plus cancer tumors tumors related to epidermis. Furthermore, caps might shield the top from extreme environment being cool, throughout cool climate plus storm durations. Males's caps furthermore produce a fashion declaration, supplying wearers a traditional plus appears that is fashionable.
Innovation in Men's Hats
Innovation has propelled the style team, plus guys's caps haven't away be placed. The limitation business has witnessed an influx linked to the designs which are present fedoras to baseball caps. Services has included level that are advanced to improve the caps' effectiveness plus functionality, and also this furthermore shows end up being the innovation milestone that is significant. Present hat designs systems that are incorporate, breathable contents, plus tech which can be moisture-wicking.
Safety of Men's Hats
The safeguards of males's caps is essential while they avoid accidents plus injuries in the circumstances which can be few. For example, difficult caps take to security that will be required for guys in construction sites, where debris that ended up cause that is being was dropping injuries. Sportsmen also put helmets, the type since kinds of limitation, to shield them from concussions. Helmets could be custom made for particular recreations hockey, skiing, plus soccer to supply protection that's been maximum.
Uses of Men's Hats
Males's caps is multipurpose, and of course they might provide requirements which can be varying like spiritual, work-related, plus regular. Spiritual caps is utilized by various teams being spiritual and they also produce to recognize the faith plus produce a feeling of belonging. Work-related caps is mainly observed in vocations the forces which are authorities which can be armed health care, plus aviation businesses. Regular caps, cold temperatures caps, are made to help keep consistently the wearer comfortable plus hot in wintertime.
How to Use Men's Hats
To enhance the durability of bucket hats for men, people should follow specified tips within the application. As an example, caps need undoubtedly feeling held from far dampness, when maybe not put, they should be saved in cool plus shops where decide to try dry. Moreover, caps should not be washed whenever frequently necessary, handwashing is preferred. Keeping caps for the spot which is specific was flat avoiding foldable them may also decrease creases.
Quality plus Service
Provider plus quality are necessary whenever males that might be caps which are purchase. Top-notch hats was comfortable plus durable. Services who target quality make sure that their caps integrate amounts which decide to try advanced plus suggestions which was top-quality improve functionality, appears, plus simplicity that has been fundamental. Providers providing service that is exemplary of their folk, free circulation plus returns, to help relieve the buying procedure.
Application of Men's Hats
Males's caps has applications being founded plus varying regarding the man or woman's function, they are able to choose kind which would work of. The study that has been instance which is fashionable in the day that is sunny Fedoras, Panama caps, plus baseball caps may push back sunburn and gives. Hard caps build safeguards in construction the internet sites, plus caps being safeguards which can be athletics that are helmet. Winter caps are specifically made for cool plus durations which are snowy heat which was give.
Dudes's caps produce different criteria as they are crucial add-ons in a genuine wide range of countries. They have been designs that best bucket hats for men exist will vary colors, plus services and products, plus innovation has found out about growth of caps and enhanced functions plus that is waterproofing which can be breathable. When buying the guys's limitation, it's important to glance at the provider which was ongoing quality offered from producer. Additionally, people need carry on along with the application recommendations to improve the durability using this caps.
Source: https://www.lynguu.com/Bucket-hats | mithokha_saderha_c6bb89ea | |
1,889,163 | 🐣 Assignment Expressions (The Walrus Operator) in Python | Overview PEP 572, also known as the "Assignment Expressions" or "The Walrus Operator,"... | 0 | 2024-06-15T02:13:57 | https://dev.to/talaatmagdy/assignment-expressions-the-walrus-operator-in-python-1m2d | python, codereview |
## Overview
PEP 572, also known as the "Assignment Expressions" or "The Walrus Operator," introduces a new syntax to the Python language, allowing assignment to variables within an expression using the `:=` operator. This enhancement offers a concise way to both assign and return a value within a single expression, improving readability and reducing redundancy in code.
## What is the Walrus Operator?
The walrus operator (`:=`) allows you to assign values to variables as part of an expression. It is particularly useful in situations where you need to use a value multiple times, making the code more readable and efficient.
## Basic Syntax
The basic syntax of the walrus operator is:
```
variable := expression
```
This assigns the result of `expression` to `variable` and returns the value of `expression`.
## Why Use the Walrus Operator?
1. **Improved Readability**: It reduces the need for temporary variables and repetitive code.
2. **Conciseness**: It allows for more concise and clear code, especially in loops and comprehensions.
3. **Performance**: It can sometimes lead to performance improvements by avoiding redundant calculations.
## Examples and Use Cases
### Example 1: Simplifying While Loops
**Without the walrus operator:**
```python
line = input("Enter a line: ")
while line != "quit":
print(f"You entered: {line}")
line = input("Enter a line: ")
```
**With the walrus operator:**
```python
while (line := input("Enter a line: ")) != "quit":
print(f"You entered: {line}")
```
In this example, the walrus operator allows the assignment and condition check to occur in the same line, making the loop more concise.
### Example 2: List Comprehensions
**Without the walrus operator:**
```python
values = [1, 2, 3, 4, 5]
squares = []
for x in values:
if (y := x * x) > 10:
squares.append(y)
```
**With the walrus operator:**
```python
values = [1, 2, 3, 4, 5]
squares = [y for x in values if (y := x * x) > 10]
```
The walrus operator makes it possible to compute the square and filter in a single line within the list comprehension.
### Example 3: Reusing Computations
**Without the walrus operator:**
```python
def process_data(data, threshold):
result = complex_computation(data)
if result > threshold:
return result
return None
```
**With the walrus operator:**
```python
def process_data(data, threshold):
if (result := complex_computation(data)) > threshold:
return result
return None
```
Here, the walrus operator eliminates the need for a separate assignment before the condition, streamlining the function.
### Example 4: Parsing with Regular Expressions
**Without the walrus operator:**
```python
import re
pattern = re.compile(r'(\d+)')
match = pattern.search('The answer is 42')
if match:
value = match.group(1)
print(f'Found number: {value}')
```
**With the walrus operator:**
```python
import re
pattern = re.compile(r'(\d+)')
if match := pattern.search('The answer is 42'):
print(f'Found number: {match.group(1)}')
```
The walrus operator allows the assignment of `match` within the `if` statement, making the code shorter and more intuitive.
## Limitations and Considerations
While the walrus operator is powerful, it should be used judiciously. Overusing it or using it in complex expressions can lead to code that is harder to read and maintain. Here are a few considerations:
1. **Readability**: Ensure that using the walrus operator actually improves the readability of the code.
2. **Complex Expressions**: Avoid using the walrus operator in very complex expressions where it might obscure the code's intent.
3. **Scope**: Be aware of the scope of variables when using the walrus operator, especially within comprehensions and loops.
## Conclusion
PEP 572 introduces a significant enhancement to the Python language with the walrus operator. By allowing assignment within expressions, it offers a way to write cleaner, more concise, and efficient code. However, like any powerful tool, it should be used thoughtfully to ensure that it enhances rather than detracts from the readability and maintainability of your code.
With these examples and considerations, you should be well-equipped to start using the walrus operator in your Python projects.
## Reference
[PEP 572: Assignment Expressions (The Walrus Operator) at main · talaatmagdyx/articles](https://github.com/talaatmagdyx/articles)
[Medium](https://talaatmagdyx.medium.com/assignment-expressions-the-walrus-operator-in-python-1e4838d91845)
Happy coding! ☃️ ⏳ | talaatmagdy |
1,889,162 | Mastering the Adapter Design Pattern: Bridging Incompatible Interfaces | The Adapter Design Pattern is a structural design pattern that allows objects with incompatible... | 0 | 2024-06-15T02:13:16 | https://dev.to/rupesh_mishra/mastering-the-adapter-design-pattern-bridging-incompatible-interfaces-4ici | The Adapter Design Pattern is a structural design pattern that allows objects with incompatible interfaces to work together. It's like a translator between two parties that do not speak the same language. In this article, we'll break down the Adapter Design Pattern into four actionable steps, using real-world scenarios and code examples to make the concepts clear and easy to understand.
Step 1: Designing the Target Interface
The first step is to design the target interface that clients expect to work with. This interface defines the methods that will be used by the client.
**Example Scenario: Media Player Application**
Imagine you have a media player application that supports different audio formats. The target interface might look something like this:
```java
public interface MediaPlayer {
void play(String audioType, String fileName);
}
```
#### Step 2: Implementing the Interface with Adapter Classes
Next, we implement the target interface using adapter classes. These adapters will translate the requests from the target interface into a format that the adaptee (the existing class) can understand.
**AdvancedMediaPlayer Interface and Implementations:**
```java
public interface AdvancedMediaPlayer {
void playVlc(String fileName);
void playMp4(String fileName);
}
public class VlcPlayer implements AdvancedMediaPlayer {
@Override
public void playVlc(String fileName) {
System.out.println("Playing vlc file. Name: " + fileName);
}
@Override
public void playMp4(String fileName) {
// Do nothing
}
}
public class Mp4Player implements AdvancedMediaPlayer {
@Override
public void playVlc(String fileName) {
// Do nothing
}
@Override
public void playMp4(String fileName) {
System.out.println("Playing mp4 file. Name: " + fileName);
}
}
```
**Adapter Class:**
```java
public class MediaAdapter implements MediaPlayer {
AdvancedMediaPlayer advancedMediaPlayer;
public MediaAdapter(String audioType) {
if(audioType.equalsIgnoreCase("vlc")) {
advancedMediaPlayer = new VlcPlayer();
} else if(audioType.equalsIgnoreCase("mp4")) {
advancedMediaPlayer = new Mp4Player();
}
}
@Override
public void play(String audioType, String fileName) {
if(audioType.equalsIgnoreCase("vlc")) {
advancedMediaPlayer.playVlc(fileName);
} else if(audioType.equalsIgnoreCase("mp4")) {
advancedMediaPlayer.playMp4(fileName);
}
}
}
```
#### Step 3: Sending the Request from Client to Adapter Using Target Interface
The client will send the request to the adapter using the target interface. The adapter will then translate the request and forward it to the appropriate adaptee.
**AudioPlayer Class:**
```java
public class AudioPlayer implements MediaPlayer {
MediaAdapter mediaAdapter;
@Override
public void play(String audioType, String fileName) {
// Built-in support to play mp3 music files
if(audioType.equalsIgnoreCase("mp3")) {
System.out.println("Playing mp3 file. Name: " + fileName);
}
// MediaAdapter is providing support to play other file formats
else if(audioType.equalsIgnoreCase("vlc") || audioType.equalsIgnoreCase("mp4")) {
mediaAdapter = new MediaAdapter(audioType);
mediaAdapter.play(audioType, fileName);
} else {
System.out.println("Invalid media. " + audioType + " format not supported");
}
}
}
```
#### Step 4: Implementing the Main Program
Finally, we implement the main program to demonstrate how the adapter pattern works in practice.
**Main Program:**
```java
public class AdapterPatternDemo {
public static void main(String[] args) {
AudioPlayer audioPlayer = new AudioPlayer();
audioPlayer.play("mp3", "beyond_the_horizon.mp3");
audioPlayer.play("mp4", "alone.mp4");
audioPlayer.play("vlc", "far_far_away.vlc");
audioPlayer.play("avi", "mind_me.avi");
}
}
```
### Conclusion
The Adapter Design Pattern is an essential tool in your system design toolkit, allowing you to integrate and utilize incompatible interfaces seamlessly. By following these four steps—designing the target interface, implementing adapter classes, sending requests via the target interface, and implementing the main program—you can effectively bridge the gap between disparate systems and components.
By mastering the Adapter Design Pattern, you can enhance the flexibility and interoperability of your software systems, ensuring that diverse components work together harmoniously. Happy coding! | rupesh_mishra | |
1,889,159 | Shell >> Redirections >> Capture | Redirection meanings What ? Changing something. Instead of putting the output to the screen instead... | 0 | 2024-06-15T02:10:47 | https://dev.to/technonotes/shell-redirections-capture-2geo | - Redirection meanings What ? Changing something.
- Instead of putting the output to the screen instead redirect to the file.
- ">" redirect and over write
- ">>" will always append.
```
#!/bin/bash
read -p "Enter ur name: " name
echo " Welcome to BOMBAY $name !!"
```
Also , you can choose which line needs to , go to the file.
```
#!/bin/bash
read -p "Enter ur name: " name
echo " Welcome to BOMBAY $name !!" > log.txt
echo " Vanakam THozha " >> log.txt
echo " -- EOL -- "
```
## /dev/null
- it will make it as NULL
- it will work only for the regular consoles.
1 --> console output ( By default it works only for standard console output ) eg., > or >>
2 --> Error
## nohup
- script will run in background.
- the process will run behind us and it won't show in the console.
- it creates nohup.out
- & --> run it in the background.
```
#!/bin/bash
num=1
while [0]
do
echo "Number is $num"
num = `expr $num + 1`
done
```
**_nohup file.sh 2>&1 &_**
## Capturing
- back ticks var = **`ls | wc -l`** ``or
- $(command) var = $( ls | wc -l )
Both will return the value.
- One problem with backtick is " it wont support nested parameters ".
so use $()
 | technonotes | |
1,889,161 | The Timeless Charm of Men's Hats: A Style Guide for Every Occasion | screenshot-1718413118997.png The many benefits of Guys's Hats Hats are not limited to security from... | 0 | 2024-06-15T02:10:11 | https://dev.to/mithokha_saderha_c6bb89ea/the-timeless-charm-of-mens-hats-a-style-guide-for-every-occasion-1ehe | screenshot-1718413118997.png
The many benefits of Guys's Hats
Hats are not limited to security from the sunlight and cold, nonetheless there is benefits that are also several
Hats can add on a beauty like little style to your ensemble, making the wearer be noticed through the team
They could additionally help hide a locks like negative and protect the most notable from ecological elements
Hats could possibly be used for virtually any event, from the casual day out to a conference like formal
Innovation in Men's Hat Design
Men's hat designs have evolved after a while, through the straw mens fedora hats like classic to your contemporary snapback
Hat manufacturers continue to innovate with new materials and designs to spotlight every possible significance of the person like modern
Hats happens to be able to be made of numerous materials, including wool, thought, leather, also recycled materials
Protection and Use of Guys's Hats
Aside from incorporating style, hats additionally serve an objective like functional
Some hats provide defense contrary to the sunlight and UV rays, while some will keep the peak hot in cold weather
Hats provide the additional asset like advantageous associated with the top from flying debris or accidental bumps
Whenever used properly, hats may help avoid injury
Day just how to make use of Hats in Your Every life
Accessorizing having a mens caps and hats shall not be complicated
Start with choosing that fit properly and complement your thing and ensemble
For the event like adhere like formal classic hats such as the fedora or perhaps the bowler
For the like casual, think about a baseball cap or even a beanie day
Be sure to match the hat utilizing the event as well as your personal style
Quality and Application of Men's Hats
While searching for a hat, it is important to spend money on quality merchandise
Quality hats are manufactured from durable materials and generally are made to last long despite regular usage
Also, some hats might be individualized with logos or emblems for branding purposes
Whether it's for personal advertising or usage purposes, hats really are a versatile and accessory like timeless any man
In conclusion, straw mens fedora hats have been around for decades and continue to be a popular fashion statement. They come in a variety of styles, materials, and designs, making them a versatile accessory for any occasion. Not only do they add style to any outfit, but they also serve a functional purpose in protecting the head and face from environmental elements. Whether it's for personal use or for branding purposes, hats are a great investment for any man.
Source: https://www.lynguu.com/application/straw-mens-fedora-hats | mithokha_saderha_c6bb89ea | |
1,889,158 | Academic research on motivation in IT developers | Hello everyone, for my final academic thesis I am conducting a survey on motivation in IT... | 0 | 2024-06-15T02:00:55 | https://dev.to/simone_fce419129/academic-research-on-motivation-in-it-developers-323j | programming, productivity, career, computerscience | Hello everyone, for my final academic thesis I am conducting a survey on motivation in IT developers.
I have produced a questionnaire aimed exclusively at those who already work in this sector and which takes only two minutes to fill out:
https://forms.gle/pkqfMRMjFrN6TmZN6
You would be a great help in collecting data if you could fill it out.
I would also be really grateful if someone could also help me in sharing the link with colleagues!
Thank you all so much in advance 🫶🏼
| simone_fce419129 |
1,889,156 | Mastering Node.js Development with Node Version Manager (NVM) | As a Node.js developer, you might have encountered situations where different projects require... | 0 | 2024-06-15T02:00:51 | https://dev.to/sayuj/mastering-nodejs-development-with-node-version-manager-nvm-53o0 | node, webdev, javascript, npm | As a Node.js developer, you might have encountered situations where different projects require different versions of Node.js. Managing multiple versions of Node.js can be a hassle, but Node Version Manager (NVM) simplifies this process. In this blog post, we'll explore what NVM is, how to install it, and how to use it effectively.
## What is Node Version Manager (NVM)?
Node Version Manager, commonly known as NVM, is a handy tool that allows developers to install and switch between different versions of Node.js effortlessly. This flexibility is essential for developers working on multiple projects that may depend on different versions of Node.js. With NVM, you can ensure that each project uses the correct Node.js version without interfering with each other.
## Why Use NVM?
### 1. Multiple Node.js Versions:
NVM lets you maintain and switch between multiple Node.js versions on your machine. This is particularly useful if you're working on legacy projects that require older versions of Node.js.
### 2. Easy Updates:
Keeping Node.js up to date is crucial for security and performance. NVM makes it easy to update Node.js to the latest version without disrupting your existing setup.
### 3. Environment Isolation:
Different projects often have different dependencies and requirements. NVM ensures that each project can run in its environment with the appropriate Node.js version, avoiding conflicts.
## Installing NVM
Before you can start using NVM, you need to install it. Here’s a step-by-step guide:
### On macOS/Linux:
1. Open Terminal.
2. Run the installation script:
```bash
curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.39.3/install.sh | bash
```
3. Update your shell profile:
Add the following lines to your ~/.bashrc, ~/.zshrc, or ~/.profile file:
```bash
export NVM_DIR="$([ -z "${XDG_CONFIG_HOME-}" ] && printf %s "${HOME}/.nvm" || printf %s "${XDG_CONFIG_HOME}/nvm")"
[ -s "$NVM_DIR/nvm.sh" ] && \. "$NVM_DIR/nvm.sh" # This loads nvm
```
4. Source your profile:
```bash
source ~/.bashrc
# or
source ~/.zshrc
# or
source ~/.profile
```
### On Windows:
For Windows users, it's recommended to use nvm-windows. You can download it from the nvm-windows GitHub repository and follow the installation instructions provided there.
## Using NVM
Once you have NVM installed, using it is straightforward. Here are some common commands:
## Installing a Node.js Version
To install a specific Node.js version, use:
```bash
nvm install <version>
# Example:
nvm install 16.14.0
```
## Listing Installed Versions
To see all installed Node.js versions, use:
```bash
nvm ls
```
## Switching Node.js Versions
To switch to a different installed Node.js version, use:
```bash
nvm use <version>
# Example:
nvm use 14.17.0
```
## Setting a Default Node.js Version
To set a default Node.js version to use in new shells, use:
```bash
nvm alias default <version>
# Example:
nvm alias default 16.14.0
```
## Uninstalling a Node.js Version
To uninstall a Node.js version, use:
```bash
nvm uninstall <version>
# Example:
nvm uninstall 12.18.3
```
## Advanced NVM Usage
### Running a Specific Node.js Version Temporarily
If you need to run a specific Node.js version for a single command, you can prefix your command with `nvm run`:
```bash
nvm run 14.17.0 <your_command>
# Example:
nvm run 14.17.0 node -v
```
### Listing Available Node.js Versions
To see a list of all available Node.js versions that can be installed, use:
```bash
nvm ls-remote
```
### Installing Node.js with LTS (Long Term Support)
For stability, it's often best to use LTS versions of Node.js. To install the latest LTS version, use:
```bash
nvm install --lts
```
## Conclusion
Node Version Manager (NVM) is an indispensable tool for any Node.js developer. It simplifies the management of multiple Node.js versions, ensuring that you can work on different projects with ease and confidence. By using NVM, you can keep your development environment clean and organized, avoid version conflicts, and stay up-to-date with the latest Node.js releases.
Mastering NVM will undoubtedly enhance your development workflow. Give it a try, and you'll wonder how you ever managed without it.
Happy Coding!!
| sayuj |
1,888,758 | 1- Introdução | Resumo em Tópicos do Livro JAVA PARA INICIANTES Objetivo do Livro: Ensinar fundamentos da... | 0 | 2024-06-15T01:50:23 | https://dev.to/devsjavagirls/1-introducao-2cpf | java, javaparainiciantes | Resumo em Tópicos do Livro **JAVA PARA INICIANTES**
**Objetivo do Livro:**
Ensinar fundamentos da programação Java.
Abordagem passo a passo com exemplos, testes e projetos.
Não requer experiência prévia em programação.
**Conteúdo do Livro:**
- Fundamentos de Java
- Recursos Avançados de Java
- Desenvolvimento Gráfico
- Preparação para o Futuro
**Evolução de Java:**
```
Java 1.0 (1995):
Lançamento inicial pela Sun Microsystems.
Revolução na programação e interatividade da Web.
Java 1.1:
Adição significativa de novos elementos de biblioteca.
Redefinição do tratamento de eventos.
Java 2 (Java 1.2):
Introdução da segunda geração da linguagem.
Criação do J2SE (Java 2 Platform Standard Edition).
J2SE 1.3 e 1.4:
Melhorias incrementais e novas funcionalidades importantes.
Inclusão de exceções encadeadas, I/O baseado em canais e a palavra-chave assert.
J2SE 5 (Java 1.5):
Grande expansão no escopo da linguagem.
Introdução de novos recursos como tipos genéricos, autoboxing/unboxing, enumerações, e anotações.
Java SE 6:
Melhorias incrementais com foco em bibliotecas de API e desempenho.
Nenhuma grande alteração na linguagem em si.
Java SE 7:
Primeira versão após aquisição da Sun Microsystems pela Oracle.
Novos recursos como instrução try-with-resources, literais inteiros binários e melhor tratamento de exceções.
Java SE 8:
Introdução das expressões lambda, simplificando e reduzindo o código-fonte.
Novo operador (->) e nova sintaxe.
Implementação padrão de métodos em interfaces.
Suporte a JavaFX, potencial substituto do Swing para GUI.
```
**Estrutura dos Capítulos**
**1. Habilidades Aprendidas**
Cada capítulo começa com um conjunto de habilidades que o leitor aprenderá.
**2. Teste**
Cada capítulo termina com um teste para verificar o conhecimento adquirido.
Respostas estão no Apêndice A.
**3. Pergunte ao Especialista**
Caixas especiais espalhadas pelo livro com informações adicionais e comentários interessantes sobre o tópico em formato de Pergunta/Resposta.
**4. Tente Isto**
Projetos práticos em cada capítulo para aplicar os conceitos aprendidos.
Exemplos reais que podem ser usados como ponto de partida para programas próprios.
**5. Pré-requisitos e Recursos**
Sem Experiência Prévia em Programação
Não é necessário ter experiência prévia em programação para usar o livro.
Programadores experientes devem ler cuidadosamente devido às diferenças de Java em relação a outras linguagens.
**6.Software Necessário**
- Necessário o último kit do desenvolvedor Java (JDK) da Oracle, versão JDK 8.
- Instruções para obtenção do JDK são fornecidas no Capítulo 1.
- Versões anteriores de Java podem ser usadas, mas não suportarão os recursos mais recentes.
**Obtendo o Java Development Kit**
Para começar a escrever programas Java, é essencial ter o Java Development Kit (JDK) instalado no computador. O JDK, disponível gratuitamente na Oracle, inclui o compilador Java (javac) e o interpretador padrão (java), necessários para compilar e executar programas. Embora existam IDEs como NetBeans e Eclipse disponíveis, que oferecem ambientes mais integrados, as instruções deste livro focam nas ferramentas de linha de comando do JDK, que são universais e acessíveis a todos os leitores.
**- Pergunte ao especialista**
Para programas pequenos, os recursos orientados a objetos do Java são praticamente transparentes, não adicionando uma carga significativa. Java permite que você decida o nível de utilização da orientação a objetos, sendo possível começar de forma simples e integrar mais recursos conforme necessário à medida que os programas crescem.
**Configuração do Java**
Além de instalar, precisamos configurar.
Sim, pois podemos ter vários Javas na máquina.
- JAVA_HOME (VARIÁVEL DE AMBIENTE)
- POR DENTRO DA IDE ESCOLHIDA (CONFIGURAR)
| devsjavagirls |
1,889,155 | Introduction to Blockchain in Cross-Industry Collaboration | Blockchain technology, originally devised for Bitcoin, has evolved to transform various industries by... | 27,673 | 2024-06-15T01:44:00 | https://dev.to/rapidinnovation/introduction-to-blockchain-in-cross-industry-collaboration-57cc | Blockchain technology, originally devised for Bitcoin, has evolved to
transform various industries by enabling secure, transparent, and efficient
cross-industry collaborations. Its decentralized nature allows multiple
parties to interact on a single platform without intermediaries, fostering
innovative solutions across sectors.
## Overview of Blockchain Technology
Blockchain is a distributed database that maintains a continuously growing
list of records, called blocks, which are linked and secured using
cryptography. This decentralized digital ledger records transactions
efficiently and in a verifiable and permanent way, enhancing data security and
privacy.
## Importance of Cross-Industry Collaboration
Cross-industry collaboration involves various sectors working together to
share knowledge, resources, and capabilities to achieve common goals.
Blockchain can help standardize technology applications, develop common
regulatory frameworks, and create innovative solutions that benefit multiple
sectors.
## Blockchain as a Catalyst for Innovation
Blockchain technology offers a decentralized and transparent ledger system,
providing a unique platform for developing solutions that require high levels
of trust and security. It has paved the way for innovations such as smart
contracts and decentralized finance (DeFi) solutions, transforming traditional
services across various industries.
## Enhanced Data Sharing Across Different Industries
Blockchain facilitates secure and transparent data sharing, helping industries
overcome barriers to collaboration and innovation. This enhanced data sharing
boosts operational efficiencies and fosters new business models.
## Reduction in Operational Costs
Blockchain reduces the complexity and cost of integrations by providing a
streamlined and secure alternative to traditional data exchange mechanisms.
Its decentralized nature eliminates the need for intermediaries, further
reducing costs.
## Improved Security Measures
Blockchain enhances security by using cryptographic techniques and consensus
algorithms to ensure data integrity. This makes it an attractive option for
industries requiring stringent data security measures and transparency.
## Mechanisms of Data Verification
Blockchain uses cryptographic hash functions and consensus algorithms to
verify data authenticity and integrity. Smart contracts further enhance data
verification by automatically executing transactions based on predefined
rules.
## Real-World Applications of Data Integrity
Blockchain ensures data integrity across various sectors, including
healthcare, finance, and legal fields, by maintaining accurate and consistent
information throughout its lifecycle.
## Challenges in Data Integrity
Ensuring data accuracy and consistency across different systems, protecting
against cyberattacks, and complying with regulatory standards are significant
challenges in maintaining data integrity.
## Advancements in Blockchain Technology
Scalability solutions, interoperability between different blockchain networks,
and regulatory clarity are expected to drive blockchain adoption and
development in 2024.
## Blockchain Integration with Other Emerging Technologies
Blockchain is being integrated with IoT, AI, and 3D printing, creating
innovative solutions that enhance security, efficiency, and transparency
across various sectors.
## Regulatory and Ethical Considerations
As blockchain technology permeates various industries, regulatory and ethical
considerations become increasingly important. Governments and regulatory
bodies are framing laws to protect consumers while fostering innovation.
## Healthcare Sector
Blockchain ensures the integrity and security of medical records, enhancing
patient care and operational efficiencies in the healthcare sector.
## Financial Services
Blockchain offers a decentralized record-keeping system that enhances security
and efficiency in financial transactions, transforming traditional banking
services.
## Supply Chain Management
Blockchain provides transparency and traceability in supply chain management,
ensuring that all parties have access to the same information, reducing
discrepancies, and building trust.
## Predictions for Blockchain Development
Blockchain technology is expected to evolve significantly, with advancements
in scalability, integration with other technologies, and regulatory clarity
driving its adoption across various sectors.
## Strategic Recommendations for Businesses
Businesses should focus on understanding the benefits of blockchain,
partnering with experts, and staying informed about regulatory developments to
leverage blockchain technology effectively.
## Final Thoughts on Blockchain's Impact
Blockchain technology is poised to revolutionize various sectors by enhancing
transparency, security, and efficiency. Its ongoing development and adoption
suggest a promising future where these benefits are significantly enhanced.
Drive innovation with intelligent AI and secure blockchain technology! 🌟 Check
out how we can help your business grow!
[Blockchain App Development](https://www.rapidinnovation.io/service-
development/blockchain-app-development-company-in-usa)
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development/blockchain-app-development-company-in-usa)
[AI Software Development](https://www.rapidinnovation.io/ai-software-
development-company-in-usa)
[AI Software Development](https://www.rapidinnovation.io/ai-software-
development-company-in-usa)
## URLs
* <http://www.rapidinnovation.io/post/blockchain-unifying-industries-for-data-integrity-in-2024>
## Hashtags
#BlockchainTechnology
#CrossIndustryCollaboration
#DataIntegrity
#EmergingTrends
#BlockchainInnovation
| rapidinnovation | |
1,889,152 | Running DeepCell on Google Batch with node pools | As part of our ongoing work to run DeepCell on GCP, I'm pleased to share our benchmarking results... | 27,298 | 2024-06-15T01:27:36 | https://dev.to/dchaley/running-deepcell-on-google-batch-with-node-pools-3hfd | googlecloud, serverless, bioinformatics, scale | As part of our ongoing work to run DeepCell on GCP, I'm pleased to share our benchmarking results using Google Batch's private preview feature: node pools.
Node pools allow Batch to reuse infrastructure across jobs, which can improve end-to-end performance for jobs with a lot of setup time (like our 3 GB container). Using a node pool reduced our benchmark time by 80%. 😎
https://medium.com/@dchaley/running-deepcell-on-google-batch-with-node-pools-8fe7d1c121a2 | dchaley |
1,889,151 | Virtualization & Containerization with Docker. | Everyone relies on data for work and decision-making. There are various cloud-enabling technologies... | 0 | 2024-06-15T01:23:16 | https://dev.to/michellebuchiokonicha/virtualization-containerization-with-docker-storage-and-network-services-2bjf | cloudcomputing, docker, api, softwaredevelopment | Everyone relies on data for work and decision-making. There are various cloud-enabling technologies but we will concentrate on. Virtualization is responsible for the abstraction, isolation, and hoarding of applications. There are different levels of virtualization and different approaches.
**Virtualization and containerization:** Making applications easily portable to new environments eg in the cloud. This will allow us to easily spin up additional instances of the application eg when the load increases.
**Storage technologies:** Applications rely on some sort of data storage. AWS, GCP, and Azure.
**Networks and restful services:** They allow for abstraction, hiding inner complexities and easily connecting system components to a more extensive cloud system.
After reading this article, you should be able to:
- Describe key features of virtualization and containerization technologies
- Apply the key features of Docker.
- Explain the benefits of characteristics of different cloud storage technologies
- Explain how restful APIs work.
- How different technologies and services can be used to manage
restful APIs.
## Virtualization and Containerization: Containerization with docker.
Containerization is central to cloud computing because it allows us to wrap applications in self-contained capsules and thereby make them easily portable to the environment.
In cloud computing, we do that all the time for example, we might develop an application on our local machine, but for better reliability and scalability, we then want to execute the application on a more extensive cluster of devices in the cloud. Also working with containerized applications, we can easily add additional machines to a cluster running that container and thereby scale horizontally when the cloud increases.
## Main components of containerization with docker.
**- Dockerfile:** A recipe containing the instructions to be executed when the container starts. Based on that docker file, we create. It describes how a containerized application is built in the form of a text file. Eg we specify the operating system which data is available within the container and which programs are to be executed.
**- Docker Image:** a blueprint or design to create instances of this container. These images are usually registered and distributed in the registry.
**- Docker Image Registry:** We can then store that image in a centralized image registry. there are private and public registries. The best-known open docker registry is the docker hub. Before we build a container from scratch, you can look at the docker hub to see if there is not a freely available image that we can adapt to our needs if necessary.
**- Container Instance:** create an instance from that container based on that image from everywhere we like. To launch an instance of an image, docker checks if the image already exists locally. If it doesn’t, the image is loaded from a registry. Then starting the containerized application is easy and it is done with a simple command. One of the advantages of this approach is that a container can be started independently of the host environment. it does not matter if we start a container on a local machine, a data center server, or the cloud.
**- Docker Compose:** To launch multiple containers that together form a larger application, we can use docker-compose. Docker compose is used to store an application containing several applications to work together. In a simple YAML document, we specify which containers should be launched with which configurations. Then we can use a simple command to spine up all the containers at once.
**- Docker swarm:** Used to run one or many containers on a cluster of several machines. A concept central to cloud computing. Here, we can run containers not on individual machines but distributed across multiple compute units in parallel. Docker swarm provides better scalability while abstracting internal complexity. From the outside, we see one logical unit running one or more containers.
## Getting started with Docker: Hands-on docker
In your Integrated development environment/terminal,
- Install docker.
- Create a dockerfile. We write the instructions to be executed in the container with many commands.
- .from: to start the container not from scratch but from an already existing image in an image registry.
- .run: to execute a terminal command
- .copy- to copy data into the container.
After creating a docker file, docker commands can be used to do several things.
- Docker Build - will create a docker image based on the docker file.
- Docker run- will create and run a container based on an image.
- Docker images- gives us the list of all the images available in a running machine.
- Docker ps: Shows us the running containers.
- Rm: Remove a container from the machine.
- start: Start a container.
- stop: Stop a container.
- commit: Commit changes to an image.
- Tag: Add a name to an image.
## Cloud deployment
Once done with development, we need to deploy the container to the cloud. We use the deployment manifest. It is a JSON file specifying which container to deploy, how ports of a container should be marched to the port of the hosting machine, and so on.
## Storage Technologies.
There are so many storage solutions available. However, we will concentrate on the major three. **AWS, Azure, and GCP.**
## AWS
**- Simple Storage Service(S3):** Object data store that can be used for unstructured data. It is highly reliable and its service level agreement concerning durability is about 99.999%. It is very reliable. It has an S3 access point and also has different tiering classes. S3 intelligent, S3 standard, S3 standard-infrequent access(S3-IA).
**- Elastic Block Store (EBS) and Elastic File Store (EFS):** They are cloud-based block storage and file systems that can be attached to EC2 instances. Amazon cloud virtual machines. It is a managed file storage for EC2. it has two classes standard and infrequent access (IA).
**- RDS: Relational database services:** It is used to host relational databases like aurora in the cloud.
**- DynamoDB:** Multimodal no SQL database on AWS and we can use a document-oriented API to work with it.
There are so many more solutions on AWS cloud storage. You can check their documentation for more.
## FLASK in Practice
In many cases like cloud-related scenarios, we want to implement a program logic as a callable service. For example, imagine we trained a machine model and now is the time to provide this model as a service that we can call from another application or web page to obtain predictions by the model.
Flask is a popular lightweight web application framework for Python to achieve exactly this. here, we learn to set up and run a simple flask app with a rest API.
We want to offer the predictions made by this model as a service callable by our rest API. we need to import the model and flask to provide the rest API. we have to also tell the application which route to choose if we send data to that API.
You can use a graphical interface like Postman and paste the URL to which you deployed your API. then you choose the route and send the data you want to make predictions for.
You can use the model to make predictions of types, for example, what can of bag is this, etc.
It is easy to use Flask to provide a restful API for a machine learning model and other programming/business logic and provide this program with a restful API to be callable by other applications and web pages.
## Google Cloud Platform(GCP)
**Cloud storage:** Object data store that can be attached to the app engine. Google’s cloud-based virtual machines. It is the cloud storage in GCP for unstructured object data. It is highly reliable and comes in 4 different tiers. Standard, Nearline tiering, coldline tiering, archive tiering.
**Cloud SQL:** A cloud-based relational database engine. it is fully managed and there is support for MySQL, PostgreSQL, and standard SQL
Firestore: no SQL data stores. This is also a document-oriented one. It is organized into collections of documents and sub-collections.
Bigtable: Also a no SQL data storage service. It is however column oriented one that is table-like data.
## Microsoft Azure
**Storage Account:** used in many ways. A family of storage services consisting of object files, column-oriented NoSQL, and huge storage services. The four different storage types here are:
Blob storage: It is intended for storing unstructured binary data. It is organized in containers of which there are three types depending on the intended data usage.
**File Storage:**
**Table Storage:**
**Queues:**
**Data Lake:** An extension of storage accounts and can be used for data storage for an entire organization.
**SQL Database:** A cloud-based version of Microsoft SQL server. A relational database. It is a managed platform as a service. It comes with two resource usage models
Single database and elastic database pool.
**Synapse:** Azure’s cloud-based data warehouse solution.
Cosmos DB: globally distributed multi-modal NoSQL database. It allows data to geographically reside close to its intended usage it is also a multi-model NoSQL database. It has gradual consistency models.
## Networks and Restful Services.
## Rest APIs:
They are essential to cloud computing because they allow us to connect individual services in a standardized way without knowing about the inner complexities of each.
This allows for microservice architectures and makes it comfortable for us to develop applications on the cloud.
What are **restful APIs?** They are intermediate between the cloud and the server.
The client can be an application that needs data from a service such as a storage solution.
Instead of learning to communicate with each of the hundreds of available storage services, we can rely on a standardized intermediate. we will talk to the API in the language we know because they are standardized. The intermediate will speak to the servers to retrieve the resources we are asking for and this hides the servers/serves inner complexity leaving us with APIs that we can work with. Imagine we want to talk to a database service in the cloud and we use restful APIs for this. We can send an HTTP request. This request will start with a method.
- Get: to retrieve a resource
- Post: to create a resource and send data
- Put: to update a resource
- Delete: to delete a resource
**Endpoint:** A unique URL in which the API is reachable.
It contains
**Header:** Used for authentication as access for most APIs is managed by role-based access control and we have to ensure that all the authorized accesses are granted.
**Body:** Used to send additional data; the API will then process the request and respond to us. The response can come in various formats like JSON, XML, YAML, CSV, and HTML but JSON is the most popular format.
APIs make communication between services straightforward. This is done by several restful API characteristics.
## Restful Paradigms
- Client-server autonomy: means the client and the server are independent of each other. here, our application does not depend on how the database works and vice versa.
- Uniform Interface between the services
- Layered architecture: An intermediate between client and server can be interpreted as an additional architectural layer.
- Caching: this can be disabled and enabled depending on the API. when enabled, we can allow clients to store resources on their machines thereby taking load from the server.
5. Stateless interactions: restful APIs are stateless. This means no request and no resources are stored and they do not influence each other.
- Code on Demand: the requested resources can also be coded. This is called code on demand. example, we can request a short javascript code snippet to be executed on our client machine. This takes load from the servers and supports flexibility in developing and using applications.
## Cloud Networks.
**Transfer between cloud services:** Cloud computing highly depends on interconnected services. This means that there is a considerable transfer between cloud services.
**Low Latency:** To ensure applications run smoothly, we depend on low latency as well as
**Security:** Secure communication. All cloud providers offer solutions for this. Eg, Azure virtual network(VNet) to establish a virtual network where our services can communicate securely and with low latency.
Cloud computing is all about distributing storage and processing across many machines while virtual networks can be used for secure communication between services.
**Load Balancers:** They distribute the load between servers. Every cloud provider offers load-balancing services in one way or another.
Managed Identities: As far as authentication and authorization are concerned, many different solutions are depending on the cloud provider and service. For example, in Azure, using managed identity, we can sign privileges to people, groups, applications, or services. For the latter, we can use a service principle and manage its privileges in the Azure active directory.
Note: This is a 4-fold series on cloud computing.
To read the first, here is the link:
https://dev.to/michellebuchiokonicha/cloud-computing-for-data-and-software-developers-43ce
it focuses on cloud services, models and roles.
| michellebuchiokonicha |
1,889,114 | Idempotência: Conceito e Aplicação na Garantia da Qualidade de Softwar | 1. Introdução Você sabe ou já ouviu falar em idempotência? Em matemática e ciência da... | 0 | 2024-06-15T00:36:43 | https://dev.to/yuri-aprendendoqa/idempotencia-conceito-e-aplicacao-na-garantia-da-qualidade-de-softwar-1gic | #### 1. Introdução
Você sabe ou já ouviu falar em idempotência?
Em matemática e ciência da computação, a idempotência é a propriedade que algumas operações têm de poderem ser aplicadas várias vezes sem que o valor do resultado se altere após a aplicação inicial. De acordo com a Wikipedia, isso significa que, após a primeira execução de uma operação idempotente, execuções subsequentes não terão efeito adicional. A idempotência é um conceito crucial na qualidade de software (QA), especialmente em serviços web e APIs, pois garante que sistemas sejam mais confiáveis e robustos.
#### 2. Conceito e Exemplos de Idempotência
Em termos de métodos HTTP, a idempotência refere-se a métodos que podem ser chamados múltiplas vezes sem produzir resultados diferentes. Segundo a W3C, o resultado de uma solicitação executada com sucesso é independente do número de vezes que ela é executada. Por exemplo, em aritmética, adicionar zero a um número é uma operação idempotente, pois não altera o valor original.
No contexto de APIs REST, os seguintes verbos HTTP são considerados idempotentes: GET, PUT, DELETE, HEAD e OPTIONS. Por outro lado, o verbo POST não é idempotente. Métodos idempotentes são seguros, ou seja, não alteram o estado da aplicação, enquanto métodos não idempotentes podem alterar o estado.
#### 3. Idempotência em APIs REST: Exemplos Práticos
**POST**: O método POST é usado principalmente para criar recursos. Cada requisição POST cria um novo recurso, alterando o estado da aplicação. Por exemplo, suponha que temos um endpoint "/user" que recebe um payload para criar um usuário:
```json
{
"name": "Lucas",
"last_name": "Paixão",
"city": "Araraquara"
}
```
Cada vez que esse endpoint é chamado, um novo usuário é criado, mudando o estado da aplicação e adicionando um novo registro ao banco de dados. Por isso, POST não é idempotente.
**GET**: O método GET é usado para recuperar dados. Ele é considerado idempotente porque, independentemente de quantas vezes seja chamado, a resposta será a mesma, sem alterar o estado da aplicação.
**PUT**: O método PUT é usado para atualizar recursos. Ele é idempotente porque, após a primeira chamada, chamadas subsequentes com o mesmo payload não alteram o estado da aplicação. Por exemplo, se enviarmos um payload para alterar a cidade de "Araraquara" para "São Paulo", a resposta será a mesma em chamadas subsequentes, com o estado da aplicação inalterado após a primeira atualização:
```json
{
"name": "Lucas",
"last_name": "Paixão",
"city": "São Paulo"
}
```
**DELETE**: O método DELETE é usado para remover recursos. Ele é idempotente porque, após a primeira chamada que deleta o recurso, chamadas subsequentes não terão efeito adicional, retornando o mesmo resultado. Por exemplo, ao deletar um usuário com "/user?name=Lucas", a primeira chamada remove o usuário e as seguintes confirmam que o recurso não existe mais, sem alterar o estado da aplicação.
#### 4. Importância da Idempotência em APIs REST
A idempotência é crucial para garantir que os serviços que consomem APIs REST funcionem corretamente, mesmo em situações de erro ou duplicação de chamadas. Por exemplo, se ocorrer um timeout, é comum que o serviço faça uma nova chamada ao endpoint. Sem idempotência, chamadas duplicadas podem causar resultados inesperados ou exceções.
Implementar idempotência previne erros e garante que o sistema se comporte de maneira previsível e confiável, mesmo sob condições adversas. Isso é essencial para manter a integridade dos dados e a estabilidade do sistema.
#### 5. Conclusão
Em resumo, a idempotência é um conceito fundamental para a qualidade de software, especialmente em serviços web e APIs. Ela garante que operações possam ser repetidas sem causar efeitos colaterais indesejados, aumentando a confiabilidade e a robustez do sistema. Ao implementar idempotência, prevenimos erros, melhoramos a experiência do usuário e garantimos a consistência dos dados. Portanto, adotar práticas idempotentes é uma estratégia vital na garantia da qualidade de software. | yuri-aprendendoqa | |
1,889,112 | Developing Cloud-Based Applications with Azure | Introduction Cloud computing has revolutionized the way businesses develop and deploy... | 0 | 2024-06-15T00:32:13 | https://dev.to/kartikmehta8/developing-cloud-based-applications-with-azure-2kfh | webdev, javascript, beginners, programming | ## Introduction
Cloud computing has revolutionized the way businesses develop and deploy applications. With the increasing demand for scalability, flexibility, and cost-effectiveness, cloud-based applications have become the preferred choice for many organizations. Microsoft Azure, one of the leading cloud platforms, offers a comprehensive set of tools and services for developing and deploying cloud-based applications.
## Advantages of Using Azure
1. **Scalability:** One of the major advantages of developing cloud-based applications with Azure is its scalability. With the ability to dynamically scale up and down based on the demand, Azure allows businesses to ensure optimal performance and cost savings.
2. **Cost-effectiveness:** Azure offers a pay-per-use pricing model, which means that organizations only pay for the resources they use, making it a cost-effective option.
3. **Reliability and Security:** Azure provides a reliable and secure infrastructure with multiple data centers spread globally, ensuring high availability and data protection.
## Disadvantages of Using Azure
1. **Learning Curve:** As Azure is a complex platform with various services and features, it may take time for developers to get accustomed to it.
2. **Vendor Lock-in:** The potential risk of vendor lock-in is significant as moving an application from Azure to another platform may not be an easy task.
## Key Features of Azure
1. **Azure App Service:** This service is designed for hosting web and mobile applications, making it easier for developers to build, deploy, and scale apps.
```bash
# Creating a new Web App in Azure App Service
az webapp up --name <app-name> --plan <app-service-plan> --resource-group <resource-group-name>
```
2. **Azure Functions:** Azure Functions facilitate serverless computing, allowing developers to run code on-demand without managing infrastructure.
```csharp
// Example of an Azure Function
public static async Task<IActionResult> Run(
[HttpTrigger(AuthorizationLevel.Function, "get", "post", Route = null)] HttpRequest req,
ILogger log)
{
log.LogInformation("C# HTTP trigger function processed a request.");
string name = req.Query["name"];
string responseMessage = string.IsNullOrEmpty(name)
? "This HTTP triggered function executed successfully. Pass a name in the query string or in the request body for a personalized response."
: $"Hello, {name}. This HTTP triggered function executed successfully.";
return new OkObjectResult(responseMessage);
}
```
3. **Azure Logic Apps:** This feature is useful for automating workflows and integrating systems, services, and applications.
```json
// Example of an Azure Logic App workflow
{
"definition": {
"triggers": {
"When_a_file_is_created_or_modified": {
"type": "ApiConnection",
"inputs": {
"host": {
"connectionName": "onedrive",
"operationId": "OnNewFile"
},
"parameters": {
"folderId": "root"
}
}
}
}
}
}
```
## Conclusion
With its numerous advantages and features, developing cloud-based applications with Azure is a wise choice for businesses looking to modernize their IT infrastructure. However, it is essential to consider the potential disadvantages and have a good understanding of the platform's capabilities to make the most out of it. As technology continues to evolve, Azure is constantly updating to meet the ever-growing demands of cloud computing, making it a reliable and future-proof choice for application development.
| kartikmehta8 |
1,889,111 | [Game of Purpose] Day 27 | Today I tried to make flying with physics with this tutorial. I wanted to fly with a simple mesh, so... | 27,434 | 2024-06-15T00:24:16 | https://dev.to/humberd/game-of-purpose-day-27-1i9p | gamedev | Today I tried to make flying with physics with [this tutorial](https://www.youtube.com/watch?v=IT9Rlyy-bSE). I wanted to fly with a simple mesh, so I started with a simple cube. I'm not yet sure how Torque works and what it is, but I followed the tutorial and it indeed flies :)
However, when flying forward/backward and sideways it looses altitude despite following the tutorial. I'd need to understand how it all works.
{% embed https://youtu.be/mPUNVMDYnq4 %} | humberd |
1,889,110 | Unleashing Reactive Programming: Boosting Responsiveness, Resilience, and Scalability | Reactive programming is a paradigm that allows for the development of responsive, resilient, and... | 0 | 2024-06-15T00:22:25 | https://dev.to/tutorialq/unleashing-reactive-programming-boosting-responsiveness-resilience-and-scalability-503 | reactive, reactiveprogramming, rxjs, scalability | Reactive programming is a paradigm that allows for the development of responsive, resilient, and scalable applications. This programming style is particularly suited for applications that deal with asynchronous data streams and events, enabling developers to build systems that react to changes in real time. This deep dive will cover the essential concepts of reactive programming, its benefits, and how it can be applied in various programming languages.
### Core Concepts of Reactive Programming
#### 1. Asynchronous Data Streams
At the heart of reactive programming is the concept of asynchronous data streams. These streams represent a sequence of events or data points that can be observed and processed over time. Unlike traditional synchronous programming, where data is processed in a linear, blocking manner, reactive programming allows for non-blocking operations, enabling the system to handle multiple events concurrently.
**Example**:
```javascript
// JavaScript example using RxJS
const { fromEvent } = require('rxjs');
const clicks = fromEvent(document, 'click');
clicks.subscribe(event => console.log(event));
```
#### 2. Observables and Observers
An observable is a data source that emits events over time. Observers subscribe to observables to receive and process these events. The observable pattern decouples the production of data from its consumption, allowing for flexible and dynamic data handling.
**Example**:
```java
// Java example using Project Reactor
Flux<String> flux = Flux.just("Hello", "Reactive", "World");
flux.subscribe(System.out::println);
```
#### 3. Operators
Operators are functions that enable the transformation, filtering, and combination of data streams. They provide a way to compose complex data processing pipelines in a declarative manner.
**Example**:
```scala
// Scala example using Akka Streams
val source = Source(List(1, 2, 3, 4, 5))
val doubled = source.map(_ * 2)
doubled.runForeach(println)
```
#### 4. Backpressure
Backpressure is a mechanism to handle the flow of data between producers and consumers when there is a discrepancy in the rate of data production and consumption. It ensures that systems do not get overwhelmed by excessive data, maintaining stability and performance.
**Example**:
```java
// Java example using RxJava
Flowable<Integer> source = Flowable.range(1, 1000)
.onBackpressureBuffer();
source.subscribe(
item -> System.out.println("Received: " + item),
Throwable::printStackTrace,
() -> System.out.println("Done")
);
```
### Benefits of Reactive Programming
#### 1. Responsiveness
Reactive programming enables the development of highly responsive applications. By handling events asynchronously and non-blockingly, applications can react to user interactions, data updates, and other events in real time, providing a smooth and responsive user experience.
**Example**:
In a web application, user inputs can be processed and feedback provided instantaneously without waiting for background processes to complete.
#### 2. Resilience
Reactive systems are inherently resilient, capable of handling failures gracefully. By isolating components and managing dependencies asynchronously, failures can be contained and managed without affecting the entire system.
**Example**:
In a microservices architecture, if one service fails, reactive programming can ensure that other services continue to function and can even provide fallback mechanisms.
#### 3. Scalability
Reactive programming is designed for scalability. By leveraging non-blocking I/O and efficiently managing resources, reactive applications can scale to handle a large number of concurrent users and data streams without degrading performance.
**Example**:
A real-time data analytics platform can scale horizontally to process massive volumes of data streams from various sources concurrently.
### Key Concepts in Reactive Programming
#### 1. Reactive Extensions (Rx)
Reactive Extensions (Rx) is a library for composing asynchronous and event-based programs using observable sequences. It provides a common set of operators for transforming, filtering, and combining streams across various programming languages.
**Example**:
```javascript
// JavaScript example using RxJS
const { of } = require('rxjs');
const { map, filter } = require('rxjs/operators');
of(1, 2, 3, 4, 5)
.pipe(
filter(x => x % 2 === 0),
map(x => x * 10)
)
.subscribe(x => console.log(x));
```
#### 2. Reactive Streams
Reactive Streams is a standard for asynchronous stream processing with non-blocking backpressure. It defines a set of interfaces and methods for implementing reactive systems that can interact seamlessly with one another.
**Example**:
```java
// Java example using Project Reactor
Flux<Integer> flux = Flux.range(1, 10);
flux.subscribe(
System.out::println,
error -> System.err.println("Error: " + error),
() -> System.out.println("Complete")
);
```
#### 3. Actor Model
The actor model is a conceptual model that treats "actors" as the fundamental units of computation. Actors encapsulate state and behavior, communicate through message passing, and can create other actors. This model is inherently reactive and is used in frameworks like Akka.
**Example**:
```scala
// Scala example using Akka
import akka.actor.{Actor, ActorSystem, Props}
class HelloActor extends Actor {
def receive = {
case "hello" => println("Hello, world!")
case _ => println("Unknown message")
}
}
val system = ActorSystem("HelloSystem")
val helloActor = system.actorOf(Props[HelloActor], name = "helloactor")
helloActor ! "hello"
```
### Common Patterns in Reactive Programming
#### 1. Event Sourcing
Event sourcing is a pattern where state changes are logged as a sequence of events. This allows for a full history of state changes, making it easy to recreate the state at any point in time.
**Example**:
```java
// Pseudocode example of event sourcing
class EventStore {
private List<Event> events = new ArrayList<>();
void save(Event event) {
events.add(event);
}
List<Event> getEvents() {
return events;
}
}
```
#### 2. CQRS (Command Query Responsibility Segregation)
CQRS is a pattern that separates the responsibility of handling commands (writes) and queries (reads). This separation allows for more scalable and maintainable systems.
**Example**:
```csharp
// C# example using CQRS
public class Command {
public string Data { get; set; }
}
public class Query {
public string Criteria { get; set; }
}
public interface ICommandHandler<T> {
void Handle(T command);
}
public interface IQueryHandler<T, R> {
R Handle(T query);
}
public class CommandHandler : ICommandHandler<Command> {
public void Handle(Command command) {
// Handle the command
}
}
public class QueryHandler : IQueryHandler<Query, string> {
public string Handle(Query query) {
// Handle the query and return result
return "Result";
}
}
```
#### 3. Circuit Breaker
The circuit breaker pattern is used to detect failures and encapsulate the logic of preventing a failure from constantly recurring, making the system more resilient.
**Example**:
```java
// Java example using Resilience4j
import io.github.resilience4j.circuitbreaker.CircuitBreaker;
import io.github.resilience4j.circuitbreaker.CircuitBreakerConfig;
CircuitBreakerConfig config = CircuitBreakerConfig.custom()
.failureRateThreshold(50)
.waitDurationInOpenState(Duration.ofMillis(1000))
.build();
CircuitBreaker circuitBreaker = CircuitBreaker.of("example", config);
Supplier<String> decoratedSupplier = CircuitBreaker
.decorateSupplier(circuitBreaker, () -> "Hello, world!");
String result = Try.ofSupplier(decoratedSupplier)
.recover(throwable -> "Recovered")
.get();
```
### Conclusion
Reactive programming is a powerful paradigm for building responsive, resilient, and scalable applications. By understanding and leveraging the core concepts of asynchronous data streams, observables, operators, and backpressure, developers can create systems that are capable of handling real-time data and events efficiently. The benefits of reactive programming, including improved responsiveness, resilience, and scalability, make it an essential approach for modern software development. Whether you are working with Java, JavaScript, Scala, or any other programming language, embracing reactive programming can significantly enhance the performance and maintainability of your applications. | tutorialq |
1,889,090 | GitHub Copilot asking multiple questions | Usually when using GitHub Copilot in Microsoft Visual Studio Code a developer asks a question, gets... | 27,651 | 2024-06-15T00:12:43 | https://dev.to/karenpayneoregon/github-copilot-asking-multiple-questions-54de | tutorial, ai, codenewbie | Usually when using GitHub Copilot in Microsoft Visual Studio Code a developer asks a question, gets an acceptable answer, and continues. But there are times when the response is close and needs some changes. In these cases do not accept the answer, instead ask a secondary question.
Example, a developer wants a Customer class with the following properties, FirstName, LastName and BirthDate.
Ask Copilot using <kbd>CTRL</kbd> + <kbd>I</kbd>
_create a customer class with Id, FirstName, LastName and Birthdate properties_
Copilot responds with
```csharp
public class Customer
{
public int Id { get; set; }
public string FirstName { get; set; }
public string LastName { get; set; }
public DateTime Birthdate { get; set; }
}
```
The developer does not need a full date time, without accepting the first answer, clears the question and enters followed by press <kbd>ENTER</kbd>.
_Change BirthDate to a DateOnly_
Copilot response with
```csharp
public class Customer
{
public int Id { get; set; }
public string FirstName { get; set; }
public string LastName { get; set; }
public DateOnly Birthdate { get; set; }
}
```
Now how about asking Copilot to generate a method to return a list of Customer using Bogus NuGet package (which is not yet installed).
Without accepting anything, clear the last question and enter the following and presses <kbd>ENTER</kbd>.
_Create a class named MockedData with a method to return 10 customers using Bogus_
Copilot produces
```csharp
public class MockedData
{
public static List<Customer> GetCustomers()
{
List<Customer> customers = new List<Customer>();
for (int i = 1; i <= 10; i++)
{
var faker = new Faker();
Customer customer = new Customer
{
Id = i,
FirstName = faker.Person.FirstName,
LastName = faker.Person.LastName,
Birthdate = faker.Date.Past(30)
};
customers.Add(customer);
}
return customers;
}
}
```
The developer does not **i** for use in the **for** statement, without accepting the answer enter the following and press <kbd>ENTER</kbd>.
```csharp
public class MockedData
{
public static List<Customer> GetCustomers()
{
List<Customer> customers = new List<Customer>();
for (int index = 1; index <= 10; index++)
{
var faker = new Faker();
Customer customer = new Customer
{
Id = index,
FirstName = faker.Person.FirstName,
LastName = faker.Person.LastName,
Birthdate = faker.Date.Past(30)
};
customers.Add(customer);
}
return customers;
}
}
```
Now accept the answer followed by adding NuGet package Bogus and there is an error on faker.Date.Past(30) as this does not apply to DateOnly.
After reading Bogus documentation the developer changes the errored code to
```csharp
Birthdate = faker.Date.BetweenDateOnly(new DateOnly(1945,1,1), new DateOnly(2000,1,1))
```
Full code with the developer making changes to the BirthDate faking.
```csharp
public class Customer
{
public int Id { get; set; }
public string FirstName { get; set; }
public string LastName { get; set; }
public DateOnly Birthdate { get; set; }
}
public class MockedData
{
public static List<Customer> GetCustomers()
{
List<Customer> customers = new List<Customer>();
for (int index = 1; index <= 10; index++)
{
var faker = new Faker();
Customer customer = new Customer
{
Id = index,
FirstName = faker.Person.FirstName,
LastName = faker.Person.LastName,
Birthdate = faker.Date.BetweenDateOnly(new DateOnly(1945,1,1), new DateOnly(2000,1,1))
};
customers.Add(customer);
}
return customers;
}
}
```
Next steps, move the Customer class to its own file and the same for the MockData class.
## What about a better solution?
First off, any developer AI which includes Copilot may provide a working piece of code but does not mean its optimal. In the example above the developer could keeping refining their question or use it. But in the case of Bogus the code below follows code samples in Bogus documentation.
```csharp
public class MockedData
{
public static List<Customer> GetCustomers(int count)
{
var identifier = 1;
Randomizer.Seed = new Random(338);
var faker = new Faker<Customer>()
.CustomInstantiator(f => new Customer { Id = identifier++ })
.RuleFor(u => u.FirstName, f => f.Name.FirstName())
.RuleFor(c => c.LastName, f => f.Name.LastName())
.RuleFor(c => c.Birthdate, f =>
f.Date.BetweenDateOnly(new DateOnly(1950, 1, 1), new DateOnly(2010, 1, 1)));
return faker.Generate(count);
}
}
```
Bonus from reading Bogus documentation is that **Randomizer.Seed** creates consistent data each time the project runs.
## Summary
Being able to continually ask Copilot questions without accepting a recommendation until satisfied can save time rather than asking Copilot to fix the code.
Like any developer tool, Copilot may provide great answers or what appear to be great answers but perhaps only to the novice developers.
Like any developer tool, Copilot may provide great answers or what appear to be great answers but perhaps only to the novice developers. And as in the example above with the BirthDate code to mockup a customer, a developer may need to think for themselves and complete code by hand.
| karenpayneoregon |
1,888,885 | From Transaction Scripts to Domain Models: A Refactoring Journey | I once led the development of a fitness tracking app. We started with Transaction Scripts to handle... | 0 | 2024-06-17T08:43:03 | https://www.milanjovanovic.tech/blog/from-transaction-scripts-to-domain-models-a-refactoring-journey | domainmodel, ddd, transactionscript, dotnet | ---
title: From Transaction Scripts to Domain Models: A Refactoring Journey
published: true
date: 2024-06-15 00:00:00 UTC
tags: domainmodel,ddd,transactionscript,dotnet
canonical_url: https://www.milanjovanovic.tech/blog/from-transaction-scripts-to-domain-models-a-refactoring-journey
cover_image: https://dev-to-uploads.s3.amazonaws.com/uploads/articles/27rmwr3xqteml30mcnwg.png
---
I once led the development of a fitness tracking app. We started with Transaction Scripts to handle features like workout creation and exercise logging. It was a simple and effective approach for the app's early stages.
However, as we added more complex features, our business logic became bloated. New business rules intertwined with existing logic, making the code difficult to maintain. Each change could introduce unintended consequences.
We solved our problem by introducing a Domain Model. The domain model shifts the focus from procedures to domain objects. Our code became more expressive, easier to reason about, and less prone to errors.
This experience taught me a valuable lesson, that I want to share in this newsletter.
## Transaction Script
At its core, business applications operate through distinct interactions (transactions) with their users. These transactions can range from simple data retrieval to complex operations involving multiple validations, calculations, and updates to the system's database.
The Transaction Script pattern provides a simple way to encapsulate the logic behind each transaction. It organizes all the necessary steps, from data access to business rules, into a single, self-contained procedure.
> Organizes business logic by procedures where each procedure handles a single request from the presentation.
_— [Transaction Script](https://martinfowler.com/eaaCatalog/transactionScript.html), Patterns of Enterprise Application Architecture_
Here's an example of adding exercises to a workout:
```csharp
internal sealed class AddExercisesCommandHandler(
IWorkoutRepository workoutRepository,
IUnitOfWork unitOfWork)
: ICommandHandler<AddExercisesCommand>
{
public async Task<Result> Handle(
AddExercisesCommand request,
CancellationToken cancellationToken)
{
Workout? workout = await workoutRepository.GetByIdAsync(
request.WorkoutId,
cancellationToken);
if (workout is null)
{
return Result.Failure(WorkoutErrors.NotFound(request.WorkoutId));
}
List<Error> errors = [];
foreach (ExerciseRequest exerciseDto in request.Exercises)
{
if (exerciseDto.TargetType == TargetType.Distance &&
exerciseDto.DistanceInMeters is null)
{
errors.Add(ExerciseErrors.MissingDistance);
continue;
}
if (exerciseDto.TargetType == TargetType.Time &&
exerciseDto.DurationInSeconds is null)
{
errors.Add(ExerciseErrors.MissingDuration);
continue;
}
var exercise = new Exercise(
Guid.NewGuid(),
workout.Id,
exerciseDto.ExerciseType,
exerciseDto.TargetType,
exerciseDto.DistanceInMeters,
exerciseDto.DurationInSeconds);
workouts.Exercises.Add(exercise);
}
if (errors.Count != 0)
{
return Result.Failure(new ValidationError(errors.ToArray()));
}
await unitOfWork.SaveChangesAsync(cancellationToken);
return Result.Success();
}
}
```
There isn't much logic here. We're just checking whether the workout exists and whether the exercises are valid.
What happens when we start to add more logic?
Let's add another business rule. We must enforce a limit on the number of exercises allowed in a single workout (e.g., no more than 10 exercises).
```csharp
internal sealed class AddExercisesCommandHandler(
IWorkoutRepository workoutRepository,
IUnitOfWork unitOfWork)
: ICommandHandler<AddExercisesCommand>
{
public async Task<Result> Handle(
AddExercisesCommand request,
CancellationToken cancellationToken)
{
Workout? workout = await workoutRepository.GetByIdAsync(
request.WorkoutId,
cancellationToken);
if (workout is null)
{
return Result.Failure(WorkoutErrors.NotFound(request.WorkoutId));
}
List<Error> errors = [];
foreach (ExerciseRequest exerciseDto in request.Exercises)
{
if (exerciseDto.TargetType == TargetType.Distance &&
exerciseDto.DistanceInMeters is null)
{
errors.Add(ExerciseErrors.MissingDistance);
continue;
}
if (exerciseDto.TargetType == TargetType.Time &&
exerciseDto.DurationInSeconds is null)
{
errors.Add(ExerciseErrors.MissingDuration);
continue;
}
var exercise = new Exercise(
Guid.NewGuid(),
workout.Id,
exerciseDto.ExerciseType,
exerciseDto.TargetType,
exerciseDto.DistanceInMeters,
exerciseDto.DurationInSeconds);
workouts.Exercises.Add(exercise);
if (workouts.Exercise.Count > 10)
{
return Result.Failure(
WorkoutErrors.MaxExercisesReached(workout.Id));
}
}
if (errors.Count != 0)
{
return Result.Failure(new ValidationError(errors.ToArray()));
}
await unitOfWork.SaveChangesAsync(cancellationToken);
return Result.Success();
}
}
```
We can continue adding more business logic to the transaction script. For example, we can introduce exercise type restrictions or enforce a specific exercise order. You can imagine how the complexity will keep increasing over time.
Another concern is code duplication between transaction scripts. This could happen if we need similar logic in multiple transaction scripts. You may be tempted to solve this by calling one transaction script from the other, but this will introduce a different set of problems.
So, how can we solve these problems?
## Refactoring to Domain Model
What is a domain model?
> An object model of the domain that incorporates both behavior and data.
_— [Domain Model](https://martinfowler.com/eaaCatalog/domainModel.html), Patterns of Enterprise Application Architecture_
A domain model lets you encapsulate domain logic (behavior) and state changes (data) inside an object. In Domain-Driven Design terminology, we would call this an aggregate.
An aggregate in DDD is a cluster of objects treated as a single unit for data changes. The aggregate represents a consistency boundary. It helps maintain consistency by ensuring that certain invariants always hold true for the entire aggregate. In our workout example, the `Workout` class can be treated as an aggregate root that encompasses all the exercises within it.
What does this have to do with a transaction script?
We can move the domain logic and state changes from the transaction script into the aggregate. This is often called "pushing logic down" into the domain.
Here's what the domain model will look like when we extract the domain logic:
```csharp
public sealed class Workout
{
private readonly List<Exercise> _exercises = [];
// Omitting the constructor and other propreties for brevity.
public Result AddExercises(ExerciseModel[] exercises)
{
List<Error> errors = [];
foreach (var exerciseModel in exercises)
{
if (exerciseModel.TargetType == TargetType.Distance &&
exerciseModel.DistanceInMeters is null)
{
errors.Add(ExerciseErrors.MissingDistance);
continue;
}
if (exerciseModel.TargetType == TargetType.Time &&
exerciseModel.DurationInSeconds is null)
{
errors.Add(ExerciseErrors.MissingDuration);
continue;
}
var exercise = new Exercise(
Guid.NewGuid(),
workout.Id,
exerciseDto.ExerciseType,
exerciseDto.TargetType,
exerciseDto.DistanceInMeters,
exerciseDto.DurationInSeconds);
workouts.Exercises.Add(exercise);
if (workouts.Exercise.Count > 10)
{
return Result.Failure(
WorkoutErrors.MaxExercisesReached(workout.Id));
}
}
if (errors.Count != 0)
{
return Result.Failure(new ValidationError(errors.ToArray()));
}
return Result.Success();
}
}
```
With the domain logic inside of the domain model, we can easily share it between transaction scripts. Testing the domain model is simpler than testing the transaction script. With a transaction script, we must provide any dependencies (possibly as mocks) for testing. However, we can test the domain model in isolation.
The updated transaction script becomes much more straightforward and focused on its primary task:
```csharp
internal sealed class AddExercisesCommandHandler(
IWorkoutRepository workoutRepository,
IExerciseRepository exerciseRepository,
IUnitOfWork unitOfWork)
: ICommandHandler<AddExercisesCommand>
{
public async Task<Result> Handle(
AddExercisesCommand request,
CancellationToken cancellationToken)
{
Workout? workout = await workoutRepository.GetByIdAsync(
request.WorkoutId,
cancellationToken);
if (workout is null)
{
return Result.Failure(WorkoutErrors.NotFound(request.WorkoutId));
}
var exercises = request.Exercises.Select(e => e.ToModel()).ToArray();
var result = workout.AddExercises(exercises);
if (result.IsFailure)
{
return result;
}
await unitOfWork.SaveChangesAsync(cancellationToken);
return Result.Success();
}
}
```
## Takeaway
Transaction Scripts are a practical starting point for simple applications. They offer a straightforward approach to implementing use cases. Transaction scripts are the recommended approach to start building [vertical slices](https://www.milanjovanovic.tech/blog/vertical-slice-architecture-structuring-vertical-slices). However, transaction scripts can become difficult to maintain as the application grows.
[Refactoring toward a Domain Model](https://www.milanjovanovic.tech/blog/refactoring-from-an-anemic-domain-model-to-a-rich-domain-model) allows you to encapsulate business logic in domain objects. This promotes code reusability and makes your application more adaptable to changes. Pushing logic down also improves testability and maintainability.
Should you use a Transaction Script or a Domain Model?
Here's a pragmatic approach you should consider. Start with a transaction script, but pay attention to growing complexity. When you notice a transaction script has too many concerns, consider adding a domain model. Remember, the domain model should encapsulate some of the complexity of the domain logic.
Thanks for reading, and I'll see you next week!
* * *
**P.S. Whenever you're ready, there are 3 ways I can help you:**
1. [**Modular Monolith Architecture (NEW):**](https://www.milanjovanovic.tech/modular-monolith-architecture?utm_source=dev.to&utm_medium=website&utm_campaign=cross-posting) Join 650+ engineers in this in-depth course that will transform the way you build modern systems. You will learn the best practices for applying the Modular Monolith architecture in a real-world scenario.
2. [**Pragmatic Clean Architecture:**](https://www.milanjovanovic.tech/pragmatic-clean-architecture?utm_source=dev.to&utm_medium=website&utm_campaign=cross-posting) Join 2,800+ students in this comprehensive course that will teach you the system I use to ship production-ready applications using Clean Architecture. Learn how to apply the best practices of modern software architecture.
3. [**Patreon Community:**](https://www.patreon.com/milanjovanovic) Join a community of 1,050+ engineers and software architects. You will also unlock access to the source code I use in my YouTube videos, early access to future videos, and exclusive discounts for my courses. | milanjovanovictech |
1,889,438 | Building a landing page for your book | This post follows on from my last post about using your website to promote your ebooks. The first... | 0 | 2024-06-28T08:36:52 | https://www.csrhymes.com/2024/06/15/building-a-landing-page-for-your-book.html | writing, marketing, webdev | ---
title: Building a landing page for your book
published: true
date: 2024-06-15 00:00:00 UTC
tags: writing,marketing,webdev
canonical_url: https://www.csrhymes.com/2024/06/15/building-a-landing-page-for-your-book.html
cover_image: https://www.csrhymes.com/img/create-a-promo-page.jpg
---
This post follows on from my last post about using your website to promote your ebooks. The first step of the article explains that you need to make a website, but didn’t go into too much detail. This post aims at explaining how you can build a landing page for your book with Bulma Clean Theme.
I’ve recently added a new promo page layout which can be used to build a landing page for your book. You can see a demo page here.
To make it easier to get started I have created a repository that you can fork to get started. Don’t worry if you don’t understand the jargon right now, we will walk through the set up step by step.
## Creating a GitHub account.
If you don’t have a GitHub account then you can sign up for one for free. From the [github.com](https://github.com/) homepage, press the Sign up button on the top right and follow the instructions.
## Forking the repository
Rather than starting from scratch, I have create a starter repository that you can use to build from.
Go to the [example-promo-page starter repository](https://github.com/chrisrhymes/example-promo-page) and click on the `Fork` button towards the top right of the page.
Give your fork a name and press `Create fork`.
## Making changes
With GitHub you normally clone the code, edit your content on your computer and then use git to commit your changes and push them back up to GitHub. Don’t worry. To simplify the process, we are going to use the ‘Edit in github.dev’ editor.
To start the GitHub.dev editor, press `.` whilst viewing your fork in GitHub. More information is available on the [GitHub docs](https://docs.github.com/en/codespaces/the-githubdev-web-based-editor).
You should see an editor appear with the list of files on the left of the screen.
## Edit the configuration
The site wide settings are stored in the `_config.yml` file. Edit the following.
- title - set this to your author pen name
- description - set this as a description of your website.
- base\_url - set this to `""`
## Add images
Go to the img folder and add an image for your avatar. A square cropped image about 400px wide by 400px high should work well here. In this tutorial we will call the image `author.jpg`. Drag and drop the author image into the img folder.
Now add an image for your book cover. An image cropped to a 800px wide by 1277px high. This is a 2 by 3 image ratio that seems to work well for book covers. Once you have your cropped image you can drag and drop this into the img folder too. Let’s call this image `book-cover.jpg` for this tutorial.
## Update the index.md page
The index.md page is your homepage. There is a section called front matter that is between the two sets of `---`. These are the settings and configuration for the page. Below the second `—--` is the page content that is used for the about section.
1. Update the title and subtitle for your book. Use the title for your book name and then the subtitle as your author pen name.
2. Update the hero\_image to the path to your book cover image file that you added to the img folder. As we named it book-cover.jpg, we need to set this to `/img/book-cover.jpg`.
3. Update the hero\_image\_alt text to the name of your book.
4. Update the hero\_link to the link to where you sell your book, such as the amazon store page.
5. Update the snippet text. This should be a short description of your book.
6. Update the about\_image to our author image, so we need to set it to `/img/author.jpg`.
7. Edit the content of the page (below the second `---`) and write about yourself and your books. This content is written in [markdown format](https://www.markdownguide.org/basic-syntax/).
For full instructions on this page take a look through the documentation for [creating a promo page](https://www.csrhymes.com/bulma-clean-theme/docs/promo-pages/creating-a-promo-page/).
## Reviews
To add a few reviews, edit the `_data/reviews/book1.yml` file. More information is available on the [reviews documentation page](https://www.csrhymes.com/bulma-clean-theme/docs/products/product-reviews/).
## Newsletter
To add a newsletter form, edit the `_includes/newsletter.html` file. This file has a placeholder form that doesn’t do anything. Copy the code from your form provider for your mailing list, such as Mailchimp, and paste it over the form in the newsletter.html file.
## Saving changes
Ensure that you have saved all your changes on each individual file by using `cmd + s` for Mac or `ctrl + s` for Windows.
Next, go to the source control tab on the left menu. You should see a list of the files that have been changed. Add a message into the top input box, something like ‘Initial setup’ and then press the `Commit & Push` button. This will commit your changes to your GitHub repository.
## Deploying your site
We are now ready to deploy your site. It’s up to you where you host your site but I would recommend a service that integrates with GitHub which will automatically deploy your changes each time you `Commit & Push` to GitHub. One such service is netlify, but there are a range of options available. Take a look at the [Jekyll deployment documentation](https://jekyllrb.com/docs/deployment/third-party/) for more information.
## Domain Name
Hopefully you now have a working promo page for your new book. The next thing to do is get your DNS set up. How you do this depends on your choice of hosting, so take a look at the service you have chosen for getting the domain name set up.
Alternatively, work with a web developer to help get this configured for you.
## What’s next?
As stated at the beginning of this article, the promo page is powered by Bulma Clean Theme and has all the built in functionality.
It has a blog page and a demo post that you can use to start blogging. Take a read through the [Jekyll Posts documentation](https://jekyllrb.com/docs/posts/) to get started with blogging.
You can also [customise the colour scheme](https://www.csrhymes.com/bulma-clean-theme/docs/getting-started/theming/#setting-the-primary-colour) to suit your branding requirements.
Take a read through the [Bulma Clean Theme documentation](https://www.csrhymes.com/bulma-clean-theme/docs/) to see all the options available. | chrisrhymes |
1,889,089 | High Frequency Trading : An introduction to Nordic Stock Exchange data | High-frequency trading (HFT) has transformed the landscape of financial markets. By leveraging... | 0 | 2024-06-14T23:49:12 | https://dev.to/shivam_sharma_0898bab64d2/high-frequency-trading-an-introduction-to-nordic-stock-exchange-data-15f0 | highfrequencytrading, priceprediction, marketmicrostructure |
High-frequency trading (HFT) has transformed the landscape of financial markets. By leveraging sophisticated algorithms and cutting-edge technology, HFT allows traders to execute thousands of transactions within fractions of a second. This rapid trading strategy exploits minute price discrepancies, thereby providing liquidity and efficiency to the markets. The speed and volume of HFT necessitate a deep understanding of the market microstructure, particularly the limit order book (LOB).
In this context, the paper "Benchmark Dataset for Mid-Price Forecasting of Limit Order Book Data with Machine Learning Methods" makes a notable contribution. It introduces the first publicly available benchmark dataset specifically designed for mid-price forecasting in high-frequency limit order markets. This dataset encompasses approximately 4,000,000 time series samples collected from five stocks traded on the NASDAQ Nordic stock market over ten consecutive trading days.
In this article, I am going to address the issues that bothered me the most while working with this dataset. The first issue is that of how the training and testing data is structured.
## Anchored Forward Cross-Validation Protocol
When dealing with high-frequency trading (HFT) data, ensuring robust evaluation of predictive models is crucial. The authors of the paper implemented a specific technique called the "anchored forward cross-validation protocol" to achieve this. Let's break down this concept in more detail.
### Cross-Validation in Machine Learning
In general, cross-validation is a method used to assess how the results of a statistical analysis will generalize to an independent dataset. It is mainly used to prevent overfitting and to provide insights into the model's performance. Traditional k-fold cross-validation involves partitioning the data into k subsets, training the model on k-1 subsets, and testing it on the remaining subset. This process is repeated k times, with each subset used exactly once as the test set.
However, time-series data, such as high-frequency trading data, present unique challenges:
1. Temporal Dependency: Observations in time-series data are not independent. The order of data points matters because past values influence future values.
2. Data Leakage: Using future data to predict past events (even inadvertently) can lead to overly optimistic performance estimates.
Anchored forward cross-validation is a method designed specifically for time-series data to ensure that the model evaluation is realistic and unbiased. Here’s how it works:
1. Sequential Data Splitting: The data is split into training and test sets based on time. Unlike traditional cross-validation, where data points are shuffled, this method respects the temporal order.
2. Anchoring the Training Set: The training set is anchored, meaning it starts from the beginning of the time period and progressively increases by adding more recent data points.
3. Rolling Window Testing: The test set is a fixed-size window that rolls forward in time. After each evaluation, the window moves forward by a fixed period (e.g., one day), and the training set is expanded to include the most recent data up to that point.
### Example Workflow
Consider a dataset spanning 10 days. Here’s a simplified workflow of the anchored forward cross-validation:
- Day 1: Train on data from Day 1, test on Day 2.
- Day 2: Train on data from Day 1 to Day 2, test on Day 3.
- Day 3: Train on data from Day 1 to Day 3, test on Day 4.
...
- Day 9: Train on data from Day 1 to Day 9, test on Day 10
In our dataset, timestamps are expressed in milliseconds starting from January 1, 1970, and are adjusted by three hours to align with Eastern European Time. This means the trading day in the data spans from 7:00 to 15:25. The ITCH feed prices are recorded to four decimal places. However, in our data, the decimal point is removed by multiplying the price by 10,000, with the currency being in Euros for the Helsinki exchange. The tick size, which is the smallest permissible gap between ask and bid prices, is set at one cent. Additionally, the quantities of orders are constrained to integers greater than one.
I have constructed a specific time shot of the limit order book which is given in the picture below.
In the figure given below, we see how the price at the different ask and bid levels evolve in time.
In the next part of the blog, we would dive into advanced visualization methods for limit order books and work with machine learning as well.
| shivam_sharma_0898bab64d2 |
1,889,087 | How @AliasFor Simplifies Annotations usage in Spring | This annotation is an annotation that allows you to create an alias for an attribute in an... | 27,602 | 2024-06-14T23:35:43 | https://springmasteryhub.com/2024/06/14/how-aliasfor-simplifies-annotations-usage-in-spring/ | java, spring, springboot, programming | This annotation is an annotation that allows you to create an alias for an attribute in an annotation. These attributes have the same function. The idea is to avoid confusion when multiple attributes can be used for the same purpose
Maybe this is the first time you have seen it.
Spring uses this annotation in places like `@Bean`, `@ComponentScan`, `@Scope`, `@RequestMapping`, etc.
So it’s more used internally. And maybe you are already using its functionality and don’t even know.
Let’s take a look at how `@RequestMapping` is using this annotation:
```java
@Target({ElementType.TYPE, ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Mapping
@Reflective({ControllerMappingReflectiveProcessor.class})
public @interface RequestMapping {
String name() default "";
@AliasFor("path")
String[] value() default {};
@AliasFor("value")
String[] path() default {};
RequestMethod[] method() default {};
String[] params() default {};
String[] headers() default {};
String[] consumes() default {};
String[] produces() default {};
}
```
The attributes `path` and `value` have the same purpose, they define the URL pattern for your request mappings.
The scenario below shows how the effect is the same and you can choose the alias you want.
```java
@Controller
public class AlisForController {
@RequestMapping(value = "/home", method = RequestMethod.GET)
public String homePage() {
return "home";
}
// Equivalent to the above using 'path'
@RequestMapping(path = "/home", method = RequestMethod.GET)
public String homePage2() {
return "home";
}
}
```
Have you ever seen this before?
Have some dev defined the `path` and in another controller, you found that it’s using a `value` for the same purpose, and somehow everything works, now you know why it works.
## **Conclusion**
So, pay attention to your project, have you found any places where this happened? Open the annotation’s code and see the `@AliasFor` there.
If you like this topic, make sure to follow me. In the following days, I’ll be explaining more about Spring annotations! Stay tuned!
Follow me! | tiuwill |
1,889,075 | RECONSIDER YOUR PATH TO SUCCESS AS A SOFTWARE ENGINEER | I've observed a prevailing trend in the software engineering community: a fixation on creating... | 0 | 2024-06-14T23:15:15 | https://dev.to/themuneebh/reconsider-your-path-to-success-as-a-software-engineer-2f4i | softwareengineering | I've observed a prevailing trend in the software engineering community: a fixation on creating products and acquiring minimal knowledge to meet requirements. However, it's crucial to realize that product development is not the ultimate goal.
Seasoned engineers dedicate significant time to maintaining, scaling, rewriting, and refactoring software. This is where the true magic unfolds. Achieving this level of expertise demands mastering technologies meticulously. It's not merely about completing tasks; it's about comprehensively grasping the tools at your disposal.
By delving deep and honing your skills, you enhance your problem-solving abilities and unlock innovative potential beyond imagination. Early on, concentrating solely on product creation can be deceptive. Embrace the path to mastery. That's where genuine breakthroughs take place. | themuneebh |
1,888,825 | Angular Animations Tutorial: Route Transitions | If you’ve ever worked with an Angular application that has routing, you may have wanted to add... | 26,395 | 2024-06-14T23:00:00 | https://briantree.se/angular-animations-tutorial-route-transitions/ | angular, animations, webdev, frontend | If you’ve ever worked with an Angular application that has [routing](https://angular.dev/guide/routing), you may have wanted to add transitions as you navigate between routes. It just makes the app feel more elegant overall. Well, if you didn’t know, this is totally doable with the [Animation module](https://angular.dev/guide/animations) and in this example, I’ll show you just how easy it is. Alright, let’s get to it.
</p>
{% embed https://www.youtube.com/embed/7d8UDEKT1pU %}
## Before We Get Started
Now, before we get too far along, it’s important to note that I’ve already created several posts focused on the animation framework in Angular.
#### Angular Animation Tutorials:
- [Learn the Basics](https://briantree.se/angular-animations-tutorial-learn-the-basics/)
- [Enter and Leave Animations](https://briantree.se/angular-animations-tutorial-enter-and-leave/)
- [The Keyframes Function](https://briantree.se/angular-animations-tutorial-the-keyframes-function/)
- [Query and Stagger Function](https://briantree.se/angular-animations-tutorial-query-and-stagger/)
- [Start and Done Events](https://briantree.se/angular-animations-tutorial-start-and-done-events/)
- [Parallel Animations](https://briantree.se/angular-animations-tutorial-parallel-animations/)
- [Animating to an unknown height](https://briantree.se/angular-animations-tutorial-animating-height/)
- [Adding Flexibility with Params](https://briantree.se/angular-animations-tutorial-add-flexibility-with-params/)
- [Creating Reusable Animations](https://briantree.se/angular-animations-tutorial-creating-reusable-animations/)
- [Disable and Enable Animations](https://briantree.se/angular-animations-tutorial-disable-and-enable-animations/)
These posts cover many different animation topics so if any of these concepts look unfamiliar to you, you’ll probably want to check these posts out first, so that you’re not lost in this example.
And, to make them easier to find, I’ve created an [Angular Animations playlist](https://youtube.com/playlist?list=PLp-SHngyo0_ikgEN5d9VpwzwXA-eWewSM&si=3WnQgeDxdAZJGGFy) on my [YouTube channel](https://www.youtube.com/@briantreese) to help, so check it out!
Ok, enough of that, onto the example for this post.
## The Demo Application
For this example we’ll be using this simple [demo application](https://stackblitz.com/edit/stackblitz-starters-dn697m?file=src%2Fmain.ts). We have a few different pages that we can navigate to. This app has already been set up with [routing](https://angular.dev/guide/routing) so when we click the links in the main nav we will navigate to the appropriate page.
<div>
<img src="https://briantree.se//assets/img/content/uploads/2024/06-14/demo-1.gif'" alt="Example of a simple application built with Angular and the Angular Routing Module and no route transitions" width="840" height="980" style="width: 100%; height: auto;">
</div>
But when we navigate to the different pages, it would be better if we had some sort of transition. Maybe some sort of crossfade as we’re seeing here:
<div>
<img src="https://briantree.se//assets/img/content/uploads/2024/06-14/demo-2.gif" alt="Example of a simple application built with Angular and the Angular Routing Module and and route transitions" width="836" height="980" style="width: 100%; height: auto;">
</div>
Well, this is exactly what we’re going to do in this example. But first, let’s look at the existing code to better understand what we need.
## The Existing Code
Ok, so like mentioned, this app has already been set up with [routing](https://angular.dev/guide/routing). So, if we take a look at the [app component](https://stackblitz.com/edit/stackblitz-starters-dn697m?file=src%2Fmain.ts), in the template we have a [router-outlet](https://angular.dev/api/router/RouterOutlet).
#### main.ts
```typescript
@Component({
selector: 'app-root',
template: `
<app-nav></app-nav>
<router-outlet></router-outlet>
`,
...
})
export class App {
}
```
When we click any of the links in the navigation component, the routed component will be inserted as a sibling of the [router-outlet](https://angular.dev/api/router/RouterOutlet) element. If we look at the [route config](https://stackblitz.com/edit/stackblitz-starters-dn697m?file=src%2Froutes.ts), we can see that this is where we’ve provided both the path that we want to see in the address bar as well as the component that we want to display when navigating to that path.
So, when we navigate to the “blog” path for example, the BlogComponent will be displayed.
```typescript
{
path: 'blog',
component: BlogComponent,
title: 'Our Blog',
}
```
Or if we navigate to the “contact” path, the ContactComponent will be displayed.
```typescript
{
path: 'contact',
component: ContactComponent,
title: 'Contact Us',
}
```
You get the idea. So, what this means as that the active component for the new route will be considered an “entering” item as far as Angular animations are concerned. And the component from the previous path will be considered a “leaving” item. This means, we’ll have a way to animate them both.
Now, if you’re unfamiliar with the concept of “:enter” and “:leave” animations, I’ve got a [video here](https://youtu.be/tDXkcITKDDY) for you, so be sure to check it out to better understand the concept.
## Creating the Route Transition Animation
Ok, now that we have an understanding of how this all works currently, let’s start by creating our animation. To do this, we’ll start by adding a new file for the animation code, let’s name it “route-transition.ts”.
Now, let’s add an exportable const so that we’ll be able to import this animation into our app component. Let’s call it "routeTransition". We will set it using the [trigger() function](https://angular.dev/api/animations/trigger) from the Angular animations module. For the name, we can call it routeTransition as well.
#### route-transition.ts
```typescript
import { trigger } from '@angular/animations';
export const routeTransition = trigger('routeTransition', [
]);
```
Ok, next we need a [transition() function](https://angular.dev/api/animations/transition). For this route transition, we will want it to run whenever the route data changes. So, we’ll animate from any state with the asterisk to any other state.
```typescript
import { ..., transition } from '@angular/animations';
export const routeTransition = trigger('routeTransition', [
transition('* => *', [
])
]);
```
Now, the first thing that we’ll want to do in this animation is set the item entering to start from a “hidden” state. So, let’s add the [query() function](https://angular.dev/api/animations/query) to query for the entering component. Then we’ll add the [style() function](https://angular.dev/api/animations/style) so that we can provide the starting styles. We’ll start with an opacity of zero, and a scale of point nine. The last thing we need to do is add the optional flag for when no entering items are found.
```typescript
import { ..., query, style } from '@angular/animations';
export const routeTransition = trigger('routeTransition', [
transition('* => *', [
query(':enter', [
style({ opacity: 0, scale: 0.9 }),
], { optional: true })
])
]);
```
Ok, next we’ll transition the leaving component. So, let’s add another [query() function](https://angular.dev/api/animations/query) and query for leaving items this time.
For this item, we don’t need any starting styles since it will automatically start from a fully opaque, full scaled size. All we need to do is add the animation so we can add the [animate() function](https://angular.dev/api/animations/animate). To make sure we can really see this animation, let’s start out by animating over one second. Then let’s add the style we’re animating to with another [style() function](https://angular.dev/api/animations/style).
We’ll want to animate to an opacity of zero, and a scale of point nine. And then this needs to be optional as well.
```typescript
import { ..., animate } from '@angular/animations';
export const routeTransition = trigger('routeTransition', [
transition('* => *', [
...,
query(':leave', [
animate('1s', style({ opacity: 0, scale: 0.9 }))
], { optional: true })
])
]);
```
Ok, the last thing we need to do is animate the entering item to its final visible state. So, let’s add another [query()](https://angular.dev/api/animations/query) and query for entering items.
Since we already set its starting style, we can just add the [animate() function](https://angular.dev/api/animations/animate) to animate to the final state. We’ll animate over one second again. Then let’s add another style function and we’ll animate to an opacity of one, and a scale of one too. Then we just need to make it optional.
```typescript
export const routeTransition = trigger('routeTransition', [
transition('* => *', [
...,
query(':enter', [
animate('1s', style({ opacity: 1, scale: 1 }))
], { optional: true })
])
]);
```
Ok, that should be everything we need for the animation. Now we can switch over and add it to the app component.
### Adding the Route Transition Animation to the Parent Component
To use the animation, let’s first add the animations array in our component metadata. Within this array, let’s add our new "routeTransition" animation.
#### main.ts
```typescript
import { routeTransition } from './route-transition';
@Component({
selector: 'app-root',
...,
animations: [
routeTransition
]
})
export class App {
}
```
Ok, so now we can wire this up But before we do, it’s important to understand how this layout works. It uses a grid. The first column is for the navigation and the second column is for the routed components. Anything that is a sibling of the [router-outlet](https://angular.dev/api/router/RouterOutlet) will be placed into the second grid column, meaning both the entering and leaving items will exist within this column on top of one another.
<div>
<img src="https://briantree.se/assets/img/content/uploads/2024/06-14/demo-3.gif" alt="Diagram explaining the columns of the overall grid layout" width="1016" height="1078" style="width: 100%; height: auto;">
</div>
The bummer here is that we need to add a container around the [router-outlet](https://angular.dev/api/router/RouterOutlet) in order to properly bind our animation since it needs to be able to query for entering and leaving items.
But, that’s ok, we can set it to [`display: contents`](https://developer.mozilla.org/en-US/docs/Web/CSS/display#contents) so it will essentially be invisible. So, let’s add a div and on this div let’s add a style with display, contents.
```html
<div style="display: contents">
<router-outlet></router-outlet>
</div>
```
Ok so this is where we’ll bind our animation trigger, but what will we bind it to in order to trigger it when changing routes?
### Triggering the Route Transition when Changing Routes
Well, for this we can use the [ActivatedRoute](https://angular.dev/api/router/ActivatedRoute) [snapshot](https://angular.dev/api/router/ActivatedRouteSnapshot) data object.
To do this, we need to add a constructor. Then we need to inject in the [ActivatedRoute](https://angular.dev/api/router/ActivatedRoute). Let’s create a protected field named “route”, and then we need to inject in the [ActivatedRoute](https://angular.dev/api/router/ActivatedRoute) class.
```typescript
import { ..., ActivatedRoute } from '@angular/router';
@Component({
selector: 'app-root',
...
})
export class App {
constructor(protected route: ActivatedRoute) {
}
}
```
Now, let’s bind our animation trigger on the div. We’ll bind to the route, snapshot, data object. This object is updated every time the route changes so it should properly trigger our animation.
```html
<div [@routeTransition]="route.snapshot.data" style="display: contents">
<router-outlet></router-outlet>
</div>
```
Ok, we’re almost there, but before this animation will run, we need to enable animations by adding the [provideAnimations() function](https://angular.dev/api/platform-browser/animations/provideAnimations) to our providers array.
```typescript
import { provideAnimations } from '@angular/platform-browser/animations';
bootstrapApplication(App, {
providers: [
...,
provideAnimations()
]
});
```
Ok, so that should be everything we need to properly transition when navigating between routes. So, let’s save and try it out.
<div>
<img src="https://briantree.se/assets/img/content/uploads/2024/06-14/demo-4.gif" alt="Example of Angular Route Transitions working correctly but with a very slow duration" width="880" height="1080" style="width: 100%; height: auto;">
</div>
Nice, looks like it’s properly animating both the component that is leaving and then animating the component that is entering. Now, it looks a little odd, primarily because of how slow it animates but, if you remember, we are animating over one second for the leaving item and then one more second for the entering item. This is pretty slow for these types of transitions, but I just really wanted to illustrate how this animation works.
Now that we can see it working, and understand it, let’s switch to a duration like point two seconds instead.
#### route-transition.ts
```typescript
export const routeTransition = trigger('routeTransition', [
transition('* => *', [
...,
query(':leave', [
animate('0.2s', ...)
], ...),
query(':enter', [
animate('0.2s', ...)
], ...)
])
]);
```
Now let’s save and try it again.
<div>
<img src="https://briantree.se/assets/img/content/uploads/2024/06-14/demo-5.gif" alt="Example of Angular Route Transitions working correctly but with a better, quicker duration" width="880" height="1078" style="width: 100%; height: auto;">
</div>
There, much better.
## Conclusion
Of course, there’s many different ways to animate this type of thing, your imagination is really all that’s holding you back because now you know everything else you need to add route transitions in your Angular applications.
Now, there’s still plenty more to cover on angular animations so I’ll go ahead and stop here for now, but keep an eye out for more posts in the future.
## Want to See It in Action?
Check out the demo code and examples of these techniques in the in the Stackblitz example below. If you have any questions or thoughts, don’t hesitate to leave a comment.
<iframe src="https://stackblitz.com/edit/stackblitz-starters-lgwtkw?ctl=1&embed=1&file=src%2Fmain.ts" style="height: 500px; width: 100%; margin-bottom: 1.5em; display: block;">
| brianmtreese |
1,889,074 | Relaxamento Natural: Guia Passo a Passo para Óleos de Massagem com Lavanda | A busca por bem-estar e saúde através de métodos naturais tem crescido exponencialmente, e como... | 0 | 2024-06-14T22:59:49 | https://dev.to/vidacomartesanato/relaxamento-natural-guia-passo-a-passo-para-oleos-de-massagem-com-lavanda-36jo | massagem, óleos, óleosnaturais, relaxamento |
A busca por bem-estar e saúde através de métodos naturais tem crescido exponencialmente, e como fazer óleos de massagem naturais com [lavanda](https://pt.wikipedia.org/wiki/Lavanda) é uma habilidade que se alinha perfeitamente com essa tendência.
A lavanda, conhecida por suas propriedades calmantes e curativas, é uma escolha ideal para quem deseja começar a explorar o mundo dos óleos essenciais.
No coração do artesanato de bem-estar, a criação de óleos de massagem personalizados oferece uma experiência única de relaxamento.
Portanto, aprender a combinar o óleo de lavanda com outras substâncias naturais não só potencializa os efeitos benéficos para a pele, mas também promove uma sensação de paz e tranquilidade.
Este guia passo a passo é projetado para iniciantes, com instruções claras e dicas práticas.
Certamente, ao seguir as orientações, você descobrirá como usar óleo de lavanda para criar misturas que atendam às suas necessidades específicas, seja para aliviar o estresse, melhorar o sono ou simplesmente para um momento de indulgência.
Além disso, ao adentrar neste processo artesanal, você também estará se conectando com uma prática milenar de autocuidado.
A saber, cada gota de óleo de massagem que você cria carrega consigo uma história, uma intenção e o toque pessoal que transforma o simples ato de massagem em uma experiência terapêutica e enriquecedora.
Em primeiro lugar, vamos explorar os fundamentos de como fazer óleos de massagem naturais com lavanda, mergulhando nas propriedades desta planta encantadora e como ela pode ser a base para um colágeno natural e eficaz.
Em segundo lugar, abordaremos as técnicas para extrair o máximo de **_benefícios da lavanda_**, garantindo que cada aplicação seja um passo em direção à harmonia e ao equilíbrio.
## O Poder da Lavanda no Artesanato de Óleos de Massagem:
A lavanda, com seu aroma característico e propriedades relaxantes, é mais do que uma planta – é uma aliada na busca por bem-estar e beleza natural.
Como fazer óleos de massagem naturais com lavanda não é apenas uma habilidade útil, mas também uma forma de arte que conecta o artesão com a natureza e com as tradições de cuidado pessoal.
**A Essência da Calma;**
A criação de um óleo de massagem começa com a escolha de ingredientes de qualidade.
A lavanda, conhecida por suas propriedades calmantes, é ideal para quem procura um refúgio natural do estresse diário.
Ao infundir óleo de lavanda em suas criações, você está convidando a serenidade para sua vida.
**Receita de Óleo de Lavanda:**
Para começar, você precisará de flores de lavanda secas e um óleo carreador, como o óleo de amêndoas.
A proporção e o método de infusão são cruciais para capturar a essência da lavanda sem sobrecarregar o óleo.
Uma receita equilibrada é a chave para um óleo de massagem eficaz e prazeroso.
**O Segredo para um Colágeno Natural:**
Além de relaxar, o óleo de lavanda pode ajudar a manter a pele firme e jovem.
Suas propriedades antioxidantes contribuem para a produção de colágeno, oferecendo uma abordagem natural para a saúde da pele.
Incorporar óleo de lavanda em sua rotina de cuidados é um passo em direção à beleza sustentável.
Cada gota de óleo de massagem artesanal carrega consigo o poder da natureza.
Como fazer óleos de massagem naturais com lavanda é mais do que um processo – é uma jornada de descoberta, onde cada ingrediente é escolhido com intenção e cada mistura é feita com amor.
Ao dominar essa arte, você não só cuida de si mesmo, mas também honra a tradição do artesanato natural.
## Benefícios Multifacetados do Óleo de Lavanda para a Pele:
A lavanda não é apenas uma planta com um aroma agradável; ela é um tesouro na arte de criar óleos de massagem que beneficiam a pele de várias maneiras.
Como fazer óleos de massagem naturais com lavanda é uma habilidade que vai além do simples ato de misturar ingredientes; é uma forma de conectar-se com a natureza e com o poder curativo das plantas.
**Nutrição e Hidratação:**
O óleo de lavanda caseiro é um excelente hidratante natural para a pele.
Rico em compostos que nutrem e revitalizam, ele ajuda a manter a pele macia e hidratada, prevenindo o ressecamento e a aspereza.
**Alívio e Reparação Para peles sensíveis ou irritadas:**
A saber, óleo de lavanda pode ser um verdadeiro alívio. Suas propriedades calmantes ajudam a reduzir a vermelhidão e a acelerar o processo de cicatrização, tornando-o um aliado na recuperação da saúde da pele.
**Beleza Sustentável:**
Ao optar por fazer seu próprio óleo de massagem com lavanda, você está escolhendo um caminho de beleza sustentável.
Utilizar ingredientes naturais significa cuidar da sua pele sem agredi-la com produtos químicos nocivos.
Cada aplicação de óleo de lavanda é uma oportunidade para desfrutar de seus múltiplos benefícios.
Como fazer óleos de massagem naturais com lavanda é uma prática que encanta não só pelo resultado final, mas também pelo processo criativo e pelo prazer de cuidar de si mesmo de forma natural e consciente.
## Passo a Passo para um Óleo de Massagem DIY:
A criação de um óleo de massagem com lavanda em casa é uma experiência que combina o prazer do artesanato com os benefícios do autocuidado.
Como fazer óleos de massagem naturais com lavanda não é apenas um processo simples, mas também uma forma de conectar-se com a natureza e com o poder curativo das plantas.
**Escolhendo os Ingredientes Certos:**
Para começar, a seleção de ingredientes de alta qualidade é essencial.
Opte por lavanda orgânica e óleos carreadores como jojoba ou coco, que são conhecidos por suas propriedades hidratantes e de absorção rápida, garantindo um produto final puro e eficaz.
**O Processo de Infusão:**
A infusão deve ser feita com cuidado, permitindo que as flores de lavanda liberem suas propriedades no óleo carreador sem superaquecimento.
Este método preserva as qualidades terapêuticas e o aroma da lavanda, resultando em um óleo de massagem mais eficaz.
## Maximizando os Benefícios:
Adicionar vitamina E ao seu óleo de massagem não só aumenta a vida útil do produto, mas também ajuda a nutrir e proteger a pele, potencializando os efeitos do colágeno e mantendo a pele firme e jovem.
## Personalização e Uso:
Personalize seu óleo de massagem adicionando outros óleos essenciais que complementam a lavanda, como camomila ou sândalo, para benefícios adicionais ou para criar uma fragrância única.
Use o óleo regularmente, especialmente após o banho, quando a pele está mais receptiva à hidratação.
## Armazenamento e Conservação:
Armazene seu óleo de massagem em um recipiente de vidro escuro para protegê-lo da luz, o que pode degradar os óleos essenciais.
Etiquete o frasco com a data de fabricação e use-o dentro de seis meses para garantir a frescura e eficácia.
Ao finalizar seu óleo de massagem, você terá um produto que não só relaxa e acalma, mas também promove a saúde da pele.
Como fazer óleos de massagem naturais com lavanda é uma habilidade valiosa que permite trazer os **benefícios da natureza para o conforto da sua casa**, criando um momento de spa pessoal sempre que desejar.
## Relaxamento e Terapia: A Dupla Dinâmica do Óleo de Lavanda:
A lavanda tem sido usada há séculos não apenas por seu aroma encantador, mas também por suas propriedades terapêuticas.
Ao aprender como fazer óleos de massagem naturais com lavanda, você está abrindo a porta para um mundo de relaxamento e cura.
**Tranquilidade Através da Natureza:**
O óleo de lavanda é um calmante natural, perfeito para reduzir a ansiedade e o estresse.
Quando aplicado na pele, ele ajuda a acalmar a mente e relaxar o corpo, criando uma sensação de paz e bem-estar.
**Alívio para o Corpo e a Mente:**
Além de suas propriedades calmantes, **o óleo de lavanda** pode ajudar a aliviar dores musculares e tensões.
É um complemento ideal para a massagem terapêutica, ajudando a soltar os músculos e promover a recuperação após o exercício ou um longo dia de trabalho.
**Aromaterapia em Casa:**
Incorporar o óleo de lavanda em sua rotina de autocuidado é como ter uma sessão de aromaterapia no conforto do seu lar.
Seu aroma pode ajudar a melhorar o sono e a qualidade de vida, tornando-o um aliado valioso na busca por uma vida mais equilibrada.
**Óleo de Massagem Terapêutico:**
Ao criar seu próprio óleo de massagem terapêutico, você tem o poder de personalizar a força e a concentração, adaptando-o às suas necessidades específicas.
Isso não só garante que você obtenha todos os benefícios da lavanda, mas também cria uma experiência verdadeiramente pessoal e única.
**Alívio para Ansiedade e Estresse:**
Em tempos de estresse, um **óleo de massagem com lavanda** pode ser um refúgio.
A aplicação regular pode ajudar a manter a ansiedade sob controle e promover uma sensação de calma durante todo o dia.
Ao dominar a arte de como fazer óleos de massagem naturais com lavanda, você está não apenas cuidando de si mesmo, mas também trazendo uma prática antiga de bem-estar para a modernidade.
É uma forma de honrar o passado enquanto cuida do presente.
## Dicas para o Uso Diário do Óleo de Lavanda:
Integrar o óleo de lavanda na rotina diária pode transformar momentos simples em experiências de puro relaxamento e cuidado pessoal.
Como fazer óleos de massagem naturais com lavanda é uma habilidade que enriquece o dia a dia com toques de bem-estar e serenidade.
**Começando e Terminando o Dia com Lavanda:**
Inicie o dia aplicando óleo de lavanda nos pulsos para um despertar suave.
À noite, use o óleo como parte de sua rotina de relaxamento antes de dormir, aplicando-o nos pés para um sono tranquilo.
**Óleo de Massagem para Pés:**
O Final Perfeito para um Dia Longo Depois de um dia cansativo, uma massagem nos pés com óleo de lavanda pode ser revigorante.
A lavanda ajuda a aliviar a tensão e promove uma sensação de leveza e conforto.
**Lavanda no Banho: Um Spa em Casa:**
Adicione algumas gotas de óleo de lavanda à água do banho para criar um ambiente de spa em casa.
O vapor combinado com o aroma da lavanda proporciona uma experiência de banho relaxante e terapêutica.
**Lavanda para a Pele: Hidratação e Cuidado:**
O óleo de lavanda pode ser usado como um hidratante natural após o banho.
Sua aplicação ajuda a manter a pele macia e bem cuidada, além de oferecer propriedades calmantes.
**Criando um Ambiente de Tranquilidade:**
Use o óleo de lavanda em um difusor para criar um ambiente tranquilo em casa ou no trabalho.
O aroma ajuda a reduzir o estresse e a criar um espaço de calma e foco.
Essas dicas mostram como o óleo de lavanda pode ser um aliado valioso no dia a dia, oferecendo múltiplos benefícios que vão além da massagem, tocando todos os aspectos da vida com sua presença calmante e curativa.
| vidacomartesanato |
1,889,033 | Project Stage-2 Implementation [part-2] | Welcome back peeps!! After a lot of theory about function multi versioning in the last blog we will... | 0 | 2024-06-14T22:53:24 | https://dev.to/yuktimulani/project-stage-2-implementation-part-2-klo | Welcome back peeps!! After a lot of theory about function multi versioning in the [last blog](https://dev.to/yuktimulani/project-stage-2-implementation-part-1-1p4n) we will start actually working on it in this part. So, without wasting any time lets get started.
I started with exploring files like
`tree.h`,`tree.cc`and `tree-inline.h`
to understand how functions are represented and cloned in GCC's gimble IR. Now the question is how do I find them. So I used the following commands and experimented with the arguments here and there and came up with the following.
Syntax
`find /path -iname filename`
This was the actual command I used
`find ./ -iname tree.h`
The file `tree.h`is in gcc/gcc/tree.h To view thw contents of the file we can use the command `cat tree.h`
After taking time to investigate the file I found out that the file contains code to help around function multiversioning and deaclares those functions but does not contain the code that is used to create clones.
Now lets explore other files.This time lets use the vim editor to read the file which make it a little easy ti read.The commanf for that is :-
`vi tree.cc`
This file is also lacated in the /gcc/gcc/ directory.
This file does not look very useful because it contains code for the tree structure and not multi versioning.
Now explore the third file `tree-inline.h`. Using the same command for vim editor. To exit vim editor without saving anything, use the command.`:Q!`
This file contains code related to inlining, versioning, cloning, and parallelization. The presence of these keywords made me feel that I am close to the actual code where turning AFMV on and passing the target architectures array is located.
If you want to search for a keyword in vim editor, just type.
`/word`
I searched for the word version by using `/version` and found the declaration of the function called
`bool tree_versionable_function_p(tree);`
This function was declared under the comment
`"/*function prototypes*/"`.
By the declaration and the name, it seems that this function determines whether the code is versionable or not. A few more commands that I tried to find the actual code were following.
`grep "clon" -r`
This commands grabs all the files containing the word "clon". It gace an ecdless list of files making it impossible to indentify
`grep "fmv" -r`
this gave me a shorter list but no results.(had a mental breakdown but I continues 😵💫)
`git log --oneline --grep="multiversioning"`
This command gives you all the past commits displayed in one line containing the word "multiversioning". I got arounf 17 commits and 3 of them were useful.
The commits are as follows.
The ones that I founf usefule were
`"[aarch64] Add function multiversioning support"`
`"Add support for target version attribute"`
`"aarch64: Fix function multi versioning mangling "`
I investigated the first two commits and I could not find very useful code, but I needed to investigate these two commits to get an idea of how things work and how the function multi versioning is done. I investigated the first two and went off track forgetting that we need to update and not add FMV. Then I came to the third commit.
To investigate any commit you can use the command.
`git show <commit hash>`
After investigating this commit, you will see there are few lines that tell you which files were changed. And the address of the file. I tried to use the command `grep "target_clones"`. But it froze my session. The correct way to do the grep along with the commit is the following.
`git show <commit hash> | grep "taget_clones"`
This is called piping. This gave me all the lines where the target clones were specified before the function. Now we need to find the function that contains the code for automatic FMV. Then I searched up the word clone and after so many occurrences I found a comment.
`/*If the function in the node has multiple target attributes, create the appropriate clone for each valid target.*/`
The function definition looks like the following.
`statuc bool expand_target_clones(struct cgraph_nodes*node, bool definition)`
This function takes in an array of target clones and the function definition to be cloned. It parses the comma separated target clones and verifies if the function is versionable by using the function that we discovered previously.
`tree_versionable_function_p`
Cannot believe that it took me so much time. I was always searching for files with obvious names. But the actual file that was useful was `/gcc/gcc/multiple_targets.cc`
Then I started my work and hardcoded the array of target architectures needed and also made the definition being passed to be true to apply function multi versioning for all functions automatically.
So now we need to test it. So I wrote a simple sum of array program and built it using O3 level optimization
First I set the hard coded targets to be sve and sve2, but the program that I designed to test it did not compile because the target sve2 is not supported by GCC version 11.3.1. Which is the version that I'm using right now.
So to know which targets are supported, I used the following command.
`gcc -E -march=help -xe /dev/null`
But this command gave me an error, but it told me which targets are valid. And are supported target architectures by my current GCC version.
Then I changed the hardcoded array to the preferred targets. Still I got the same error.
So now I checked the file CPU info which is under the directory proc. And this file gave me the features of every processor. And also told me what all features are supported by each processor.
## Wrapping It Up: A Roller Coaster Ride in Code Land
After navigating through a labyrinth of files, parsing through oceans of code, and deciphering the cryptic hieroglyphics that is GCC's inner workings, I finally emerged victorious! 🎉 Although I did face some hiccups with target architectures and GCC versions (who knew “sve2” was such a stickler for attention?), I’m now armed with knowledge and a few more grey hairs.
## Key Takeaways:
- Persistence Pays Off: It took a while to locate the right file (/gcc/gcc/multiple_targets.cc), but persistence led me to the treasure chest of FMV code.
- Tools are Your Friends: Commands like grep, find, and git show became my trusty sidekicks in this quest. (Seriously, I might name my next pet “grep”.)
- Know Your Limits: GCC version 11.3.1 has its own quirks, and knowing what your tools can and cannot do is half the battle.
## Lessons Learned:
- Stay Curious: Digging through the commits and code not only helped me understand FMV better, but also improved my detective skills (move over, Sherlock!).
- Stay Organized: Keep track of useful commands and file paths. It saves time and sanity in the long run.
- As I wrap up this chapter of my FMV journey, I look back and chuckle at the moment when I almost turned my keyboard into a Frisbee. 🥏 But hey, no keyboards were harmed in the making of this blog!
## What’s Next?
Next up is testing the FMV with different GCC versions and refining my approach to cater to all the architectures out there (yes, even the picky ones like “sve2”). I’ll also be looking into more advanced optimizations and perhaps dabbling in some parallel processing fun.
Stay tuned, dear readers, as I continue to unravel the mysteries of function multi versioning. And remember, if you ever find yourself lost in a sea of code, just keep swimming… and maybe bring a snorkel. 🏊♂️
## Reflections:
This project was like a wild roller coaster ride—thrilling, sometimes dizzying, but ultimately satisfying. I’ve learned so much about GCC’s inner workings and realized that there’s always more to explore and improve. I plan to dive deeper into compiler optimizations and perhaps even contribute to the community.
## Links to My Code:
- [My GitHub Repository](https://github.com/YuktiMulani/gcc-fork)
- [Specific FMV Changes](https://github.com/YuktiMulani/gcc-fork/blob/1bb2535c7cb279e6aab731e79080d8486dd50cce/gcc/multiple_target.cc#L305)
Thank you for joining me on this journey. Until next time, happy coding! 🚀
| yuktimulani | |
1,827,966 | Notes about The Chapter 01 of Web Scalability For Startup Engineers | Notes about The Chapter 01 of Web Scalability For Startup Engineers (Image by Herbert Austfrom... | 0 | 2024-06-14T22:46:45 | https://dev.to/ezpzdevelopement/notes-about-the-chapter-01-of-web-scalability-for-startup-engineers-28oc | softwareengineering, architecture, softwaredevelopment, systemdesignintervie |
_Notes about The Chapter 01 of Web Scalability For Startup Engineers (Image by Herbert Austfrom Pixabay)_
Last week, I wanted to learn more about system design and scalability. So, I started by watching YouTube videos and reading LinkedIn posts to get a general idea. I also looked into book reviews, and it seems like “Designing Data-Intensive Applications” is a popular choice among many people.
I wanted to begin with something simpler since “Designing Data-Intensive Applications” covers a lot of detailed topics. After talking to a friend and hearing recommendations from others in our field, I found out about “Web Scalability for Startup Engineers.” This week, I started with the first chapter, which gave an overview of the topics the book will cover.
### Notes:
#### What is Scalability:
the ability of our system to handle more data, request, users and transactions , we must be able to scale up and down in a cheap and quick way.
#### Scalability Dimensions:
- **Handling more data** : storing more content, with popularity if data analytics and big data this play an important role.
- **Handling higher concurrency levels:** how many users (open connections, active threads, messages being processed at the same time) can our system server at the same time, how can we solve the problems of servers having few processing units, ensure parallel execution of code to ensure data consistency.
- **Handling higher interaction rates** : how many times clients exchange communication with the server , must be able to handle responses quicker, faster read and writes and higher concurrency.
#### Scalability vs Performance:
Scalability is related to performance; Scalability determines the capacity to handle more users, Performance refers to how swiftly the system handles requests under load, such as the speed at which it can respond to 100 user requests every 5 seconds.
**Scalability is also implied when it comes to team members, the more people a team the harder the communication.**
#### DNS:
Is usually hosted in a different server , the customer connect to it get the dns server get the ip address of the domain and then he start requesting content from our server.
#### VPS:
Is virtual machine for rent; hosted with other virtual machines in a one physicall machine, this aproach is not good
#### Single Server configuration:
this option is better but we might switch if:
- Our user base grow, and it will take more cpu, i/o to serve our users
- Database grow we added alot of data , queries will take more time to execute so we need more cpu and I/O power.
- Added new features which are going to make users interact more with the system, and this will need more resources.
#### How Can We Scale Vertically:
**1- Adding more I/O capacity by adding more hard drives in RAID arrays:**
RAID arrays: is a set of hard or solide state drives linked together to form a one logical storage, to protect data in case of failures, here is some popular RAID config used:
- RAID 0( None drive can fail) : the data is split evenly between two drives
- RAID 1( 1 drive can fail) : mirroring, at least two drive have the exact copy of data , if a disk fail others will be able to continue working
- RAID 5( 1 Drive failure): Stripping with parity, requires the usage of 3 drives, splitting the data across multiple derives , but also has parity distributed across the drives
- RAID 6( 2 drives failure) : Stripping with double parity, similar to RAID 5, but the parity is written in two additional drives
- RAID 10 ( up to one drive in each array ): combine RAID 1 and RAID 0, mirror all data in secondary drives, and use stripping acrros each set of drives to speed up data transfers
Parity: is a calculated value stored in a drive from other drives in the array , used to reconstruct the data in a case of failure of one of the drives.
**2- Improve I/O access time by switching to solide state drives (SSD):**
SSD is fasster than hdd , but for databases it is not the case because alot of databases like mysql are optimized for sequentiel read , and databases like cassandra goes further and use mostly sequentiel read.
Sequentiel disk operations is like reading a disk page by page, while radoù disk I/O is like picking a random page in a book each time, ssd is so much faster than hdd when it comes to random , and also sequentiel because of the lack of physical head.
**3- Reducing I/O by increasing RAM:**
More caching space, more memory for the app to work in , better for DB because they cach frequently accessed data in ram.
**4- improve network throughput:**
by upgrading network interfaces, upgrade network adapters , upgrade providers.
**5- switching to a more powerful server:**
a server with more virtual cores, server with 12 or 24 threads( virtual cores), processes do not have to share cpu, cpu will perform less context switches.
Vertical scalability is a simple approach because we dont have to rearchitect anything we just need to upgrade our hardware and this come with cost.
OS may prevent use from scalling vertically also, in some databases increasing CPUs won’t do any improvements because of increasing lock contention.
Locks: are used to sync access between threads to a specific resources like memory or files, lock contention happen when a one lock is used for a big resources that has a lot of operations, to solve this fine grained locks must be introduced which create a much more specific locks for each task in the resource and allow threads to access the resource more effitiantly. Therefore adding more cpu when lock contention happen does not have any significant impact.
We should Design app with high concurrency in mind, so when we add more cores it is not going to be a waste.
### Isolation Of Services:
Is the separation of services (db, ftp, dns, cache, web server ) into multiple phsysicall servers, when we do this we have no room to grow.
Deviding a system based on functionality to scale is called functional partitioning, for example dividing the admin service and client service in multiple physicall servers.
CDN: content delivery network , a hosted server that cares of the global distribution of static content like js, css, images ,videos, it works as an http proxy, if a client need to download a static content the cdn check if he has the content if not he request it from the server and cach it , and other clients will be server from cdn without even contacting the server.
### Horizontal Scalability
It has to be considered before the application is built,systems that are true horizontally scalable does not need a powerful machine, they usually run on multiple cheap machines, and you can add as much servers as you want, you avoid the high price of buying top tier hardware , and vertical scalability ceiling problem( no more powerful hardwares).
Scaling with multiple data centers in case of having a global audience is important as it provide protection against rare outage events , and client in other countries can get a response faster.
Scaling horizontally with webservers and caches, is easier than scaling persistence stores and databases.
The usage of a round robin dns is the choice if we use multiple web server, this will distribute traffic between servers, what round robin dns does is that he just get a domain name and allow use to map the domain name to multiple ip addresses, when a client send a request the round robin dns map the client request to a server , a two clients might connect to different servers without even realising
A data center infrastructure:
- Frontline: first part that user devices interactwith, does not cotaine any business logic, help us, can exist in or outside of our datacenter,
- First client send a request , geoDNS to resolve the domain name and send the closet load balancer ip address ; then it get distributed to frontend cach server or directly to frontend app server
- CDN, Load balancers, reverse proxies , can be used and hosted by third parties,
Load balancer: is a hardware or software that allow the addition and removal of servers dynamically, it also help in distributing traffic to multiple servers.
Reverse proxy: is an intermediate between client request and the actual server , can be used as a load balancer , or for web acceleration where compress inbound and outbound data and also cache content and also do the ssl encryption which boost main server performance (he have proxy taking care of side tasks for him), can act as a server who preserve the anonymity and encapsulate how the real internal structor look like because clients can access our data center or internal structor from a one record locator or url.
Edge cache server: is http cach server located near customers, can cache an entire http request , it can cach an entire page, or partially cache it and delegate some other parts to the server, it can also decide that the page is not cachable and delegate the entire page to the server.
A single data center can scale using edge cach and cdn, and It is not necessary to use alot of components and technologies to scale , instead we should use what is necessary
The application architecture should not involve around technologies (programming languages, databases) , it should focus on the domain model to create a mental picture of the problem that we are trying to solve.
The Frontend Must be kept as dumb as possible, and allow it to use message queues , and the cache backend , caching the html page along with the database query is more efficient than just caching the database query, Web services is critical part of the application as it contains the most important parts of our business logic.
Servers might have job processing servers or job running on schedule, with the goal of handling notifications, order fullfilement or some other high latency tasks.
SOA: service oriented architecture focused on solving business needs , where each service has very clear contract and use the same communication protocols.
SOA has some alternatives; layered architecture, hexagonal architecture, event-driven architecture.
Multi layer architecture is a way to represent functionality in a form of different layers, components in lower layer expose functionality to upper layer , lower layers can never depend on the functionality of a top layer.
In a layered architecture, having richer features in a specific layer usually leads to a more stable API. Conversely, simpler features may result in a less stable API, as changes to lower layers’ APIs can be costly due to dependencies from many other APIs.
Hexagonal architecture assume that the business logic of the app is the center of the app , there is a contract between the business logic and non business logic component , but no layers, the main reason of this is that we can replace any of the non business logic component at any time without effecting our core app.
Event-Driven Architecture (EDA) shifts the focus from responding to requests to handling actions. It works by creating event handlers that wait for an action to occur and then react to it.
In all the architectures dividing the app into smaller units that function independently will show a performance benefits, we can think of these web services as a an autonomous applications where each one become a separate app, each app hide it’s implementation details and present a high level api.
Message queue, app cache , main datastore, … , we should think of them as plugins that we can replace at any time with another technology.
Isolating third party services is a good for us as we dont know if they are scalable, or if we have full control on them , so isolating them and make it possible to replace them later is beneficial. | ezpzdevelopement |
1,499,602 | Create A Vim Plugin For Your Next Programming Language, Indentation and Autocomplete | In the previous post, i discussed how to structure our vim plugin, and how we can add the beautiful... | 0 | 2024-06-14T22:46:00 | https://dev.to/ezpzdevelopement/create-a-vim-plugin-for-your-next-programming-language-indentation-and-autocomplete-4314 | vim, extension |
In the [previous post](https://dev.to/abderahmanemustapha/create-a-vim-plugin-for-your-next-programming-language-structure-and-syntax-highlight-1dog-temp-slug-8281004), i discussed how to structure our vim plugin, and how we can add the beautiful syntax highlight feature.
In this short post, i will explain how to add a simple auto-complete in addition to indentation, if you want to see a full example of a working vim extension for a new programming language, please check this [GitHub repository](https://github.com/abderrahmaneMustapha/vim-iop)
### Indentation
So first we need to create a new file in ftplugin directory, if you want to know more about autoload and other vim extension folders make sure to check the first part of this blog post [here](https://dev.to/abderahmanemustapha/create-a-vim-plugin-for-your-next-programming-language-structure-and-syntax-highlight-1dog-temp-slug-8281004)
The name of the new file is iop.vim, we will show a short example of how we handled indentation in our extension, you can check the full file here
```
:inoremap { {<CR><tab><CR><bs><bs><bs><bs>}<up><tab>
```
Essentially, we are telling our IDE that if a user opens a bracket and then hits enter, and of course, when we press enter, we will jump to a new line with this command above the cursor will not begin at the beginning of the line but will left some space behind, the space here is represented by the <tab>.
In our case, we defined the space in the fifth line of our file as you can see below
```
set tabstop=4
```
### Autocomplete
It is time to discuss autocomplete, so we can end this blog post.
You will need to create two new folders text and [autoload](https://github.com/abderrahmaneMustapha/vim-iop/tree/main/autoload) in the text folder we will put all the possible worlds in our new programming language, in our case we created 4 files, one for decorators, another one for types, values, and iop.text file is for identifiers.
These four files are imported in autoload/iopcomplete.vim file, this last-mentioned file contains the autocomplete logic you can check the full file here at this [link ](https://github.com/abderrahmaneMustapha/vim-iop/blob/main/autoload/iopcomplete.vim).
This was just a general description of what we did to create a new simple vim extension, for this new programming language, you can understand more by reading the code in the[Github repository.](https://github.com/abderrahmaneMustapha/vim-iop) | ezpzdevelopement |
1,889,072 | Smart Contract Development: Transforming Modern Business | Introduction Smart contracts represent a transformative technology that is reshaping... | 27,673 | 2024-06-14T22:42:50 | https://dev.to/rapidinnovation/smart-contract-development-transforming-modern-business-3kpj | ## Introduction
Smart contracts represent a transformative technology that is reshaping the
way businesses and individuals engage in transactions. These self-executing
contracts, stored on a blockchain, automatically execute and enforce the terms
of a contract when predetermined conditions are met, eliminating the need for
intermediaries.
## What is Smart Contract Development?
Smart contract development involves creating self-executing contracts with the
terms of the agreement directly written into code. These contracts exist
across a decentralized blockchain network, ensuring security and reducing the
need for external enforcement.
## Types of Smart Contracts
Smart contracts can be developed on various blockchain platforms, each
offering unique features. Ethereum is the most popular, using Solidity for
coding. Hyperledger Fabric, known for its permissioned network, uses general-
purpose languages like Go and Java. Other platforms include EOS and Tezos,
each catering to different needs.
## Benefits of Smart Contract Development
Smart contracts offer numerous benefits, including automation and efficiency,
enhanced security and trust, and significant cost reduction. They streamline
processes, reduce human error, and ensure transparent and secure transactions.
## Challenges in Smart Contract Development
Despite their advantages, smart contracts face challenges such as technical
vulnerabilities, legal and regulatory issues, and scalability concerns.
Addressing these challenges requires ongoing research, development, and
collaboration among stakeholders.
## How to Develop Smart Contracts?
Developing smart contracts involves choosing the right blockchain platform,
using appropriate tools and languages, and rigorous testing and deployment.
Popular tools include Truffle Suite for development and Web3.js for
integration with front-end applications.
## Real-World Examples of Smart Contract Applications
Smart contracts are used in various industries, including finance, supply
chain management, and real estate. For instance, IBM's Food Trust blockchain
enhances supply chain transparency, while MakerDAO uses smart contracts to
manage a stablecoin pegged to the US dollar.
## Future of Smart Contract Development
The future of smart contract development is promising, driven by technological
advancements and increasing adoption across industries. Innovations like AI
integration and scalability solutions are enhancing the capabilities of smart
contracts.
## Why Choose Rapid Innovation for Implementation and Development
Rapid Innovation offers expertise, customized solutions, and ongoing support
and maintenance, ensuring efficient and effective smart contract development.
Their approach helps businesses stay competitive in a fast-paced market.
## Conclusion
Smart contract development is a dynamic field requiring a deep understanding
of blockchain technology, security, and proactive maintenance. As the
technology evolves, it promises to revolutionize contractual agreements across
various industries.
Drive innovation with intelligent AI and secure blockchain technology! 🌟 Check
out how we can help your business grow!
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development-company-in-usa)
## URLs
* <http://www.rapidinnovation.io/post/what-is-smart-contract-development-complete-guide>
## Hashtags
#SmartContracts
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#FutureOfBlockchain
| rapidinnovation | |
1,889,068 | Improving coding skills with games! 🎮 | Coding is a lot of fun, but imagine having even more fun by coding and playing at the same time! 🎮✨... | 0 | 2024-06-14T22:24:54 | https://dev.to/buildwebcrumbs/improving-coding-skills-with-games-aco | css, tailwindcss, frontend, gamedev | **Coding** is a lot of fun, but imagine having even more fun by coding and **playing** at the same time! 🎮✨ In this article, I'm going to share tips on how you can level up your **programming** skills and have a blast while doing it. 🚀🧩
## Css2Wind 🌬️
In this game, you get to translate native **CSS** to **Tailwind CSS**! 🕹️✨ It’s an incredibly helpful tool for frontend developers looking to master **Tailwind CSS**. You can also share your **successes** and **mistakes** on Twitter to showcase your learning journey.
[css2wind](https://www.css2wind.com/
)
## Blockly Games 🧩
Imagine solving **puzzles**, navigating mazes, and even making animations—all by snapping together **colorful** code blocks! It's like building with Lego, but for code. **Just drag and drop**, and watch your creations come to life. 🧩🚀(Recommended for kids)
## Flexbox Froggy 🐸
Is an interactive game that teaches you the basics of **CSS Flexbox** 🎨, a powerful layout tool in web development. The game guides you through various levels where you help **Froggy** and friends by writing **CSS code** to arrange **lily pads** 🪷 and **frogs** in different layouts.
| m4rcxs |
1,889,067 | Mystery World | A post by Darvin Monteras | 0 | 2024-06-14T22:24:43 | https://dev.to/metadarvinmonteras/mystery-world-d6j | javascript, beginners, webdev, productivity |
[](https://darvinmonteraswebsiteorg.godaddysites.com) | darvinmonterasgodaddysitescom |
1,889,060 | Java’s Evolution: Top 5 Features from Java 8 to 22 | The Evolution of Java: Top 5 Features from Java 8 to Java 22 Java has continuously evolved... | 0 | 2024-06-14T22:03:06 | https://dev.to/tutorialq/javas-evolution-top-5-features-from-java-8-to-22-1dbg | java, javafeatures, javaevolution, java22 |
## The Evolution of Java: Top 5 Features from Java 8 to Java 22
Java has continuously evolved to meet the demands of modern software development. This article explores the top 5 features introduced in each Java version from Java 8 to the latest Java 22, providing in-depth explanations, useful examples, and guidance on transitioning to the latest versions.
### Java 8: The Game Changer
Java 8, released in March 2014, marked a significant shift in the Java programming landscape with the introduction of functional programming features and the new Stream API. Here are the top 5 features of Java 8:
**Lambda Expressions**
Lambda expressions enable you to treat functionality as a method argument or to create concise methods. For example:
```java
List<String> names = Arrays.asList("Mahidhar", "Sophia", "Liam");
names.forEach(name -> System.out.println(name));
```
This feature simplifies code, making it more readable and maintainable, especially in scenarios involving collection processing.
**Stream API**
The Stream API allows for functional-style operations on collections of objects. For instance:
```java
List<String> names = Arrays.asList("Mahidhar", "Sophia", "Liam");
List<String> sortedNames = names.stream()
.sorted()
.collect(Collectors.toList());
```
It facilitates bulk operations on collections, such as filtering, mapping, and reducing, improving code readability and performance.
**Optional Class**
The `Optional` class is a container object used to contain not-null objects, helping to avoid null checks. Example:
```java
Optional<String> name = Optional.ofNullable("Mahidhar");
name.ifPresent(System.out::println);
```
This reduces the risk of `NullPointerException` and makes the code more expressive and intent-revealing.
**Default Methods**
Default methods allow you to add new methods to interfaces without breaking existing implementations. Example:
```java
interface Greeting {
default void sayHello() {
System.out.println("Hello!");
}
}
```
This enables interface evolution by providing a way to add new methods while maintaining backward compatibility.
**Date and Time API (java.time)**
The new Date and Time API provides a comprehensive and flexible way to handle date and time. Example:
```java
LocalDate today = LocalDate.now();
LocalDate birthday = LocalDate.of(1990, Month.JUNE, 15);
```
It offers a more robust, versatile, and user-friendly approach to handling date and time compared to the old `java.util.Date` and `Calendar` classes.
### Java 9: Modularity and More
Java 9, released in September 2017, introduced the module system and several other enhancements. Here are the top 5 features of Java 9:
**Java Platform Module System (JPMS)**
JPMS (Project Jigsaw) introduces a modular system for Java, allowing for better encapsulation and dependency management. Example:
```java
module com.example.myapp {
requires java.base;
}
```
This enhances application structure, improves security, and reduces memory footprint by enabling the creation of smaller, more efficient Java applications.
**JShell (REPL)**
JShell provides an interactive command-line tool for learning and prototyping Java code. Example:
```java
jshell> int sum(int a, int b) { return a + b; }
jshell> sum(2, 3)
```
It accelerates experimentation and learning by providing immediate feedback on code snippets.
**Factory Methods for Collections**
Factory methods simplify the creation of immutable collections. Example:
```java
List<String> names = List.of("Mahidhar", "Sophia", "Liam");
```
This reduces boilerplate code and ensures that collections are immutable, enhancing code safety and clarity.
**Improved Stream API**
Enhancements to the Stream API include methods like `takeWhile`, `dropWhile`, and `iterate`. Example:
```java
Stream.of("a", "b", "c", "", "e")
.takeWhile(s -> !s.isEmpty())
.forEach(System.out::println);
```
These provide more versatile and readable ways to manipulate streams.
**Private Interface Methods**
Allows private methods in interfaces to share code between default methods. Example:
```java
interface MyInterface {
default void defaultMethod() {
privateMethod();
}
private void privateMethod() {
System.out.println("Private method");
}
}
```
This promotes code reuse within interfaces, enhancing maintainability.
### Java 10: Local Variable Type Inference
Java 10, released in March 2018, brought several enhancements, with local variable type inference being the most notable. Here are the top 5 features of Java 10:
**Local Variable Type Inference (var)**
`var` allows the compiler to infer the type of local variables, reducing boilerplate code. Example:
```java
var list = List.of("Mahidhar", "Sophia", "Liam");
for (var name : list) {
System.out.println(name);
}
```
This improves code readability and reduces redundancy while maintaining type safety.
**Unmodifiable Collections**
Convenience methods to create unmodifiable collections. Example:
```java
var list = List.copyOf(Arrays.asList("Mahidhar", "Sophia", "Liam"));
```
This simplifies the creation of immutable collections, promoting safe data handling.
**Garbage Collector (GC) Improvements**
Introduces the G1 GC as the default garbage collector. This enhances application performance and reduces latency by improving garbage collection efficiency.
**Application Class-Data Sharing**
Improves startup time and memory footprint by sharing common class metadata between Java processes. This optimizes resource usage, particularly in environments where multiple Java applications run simultaneously.
**Thread-Local Handshakes**
Allows thread-local operations without global safepoints, reducing pause times. This improves performance in multi-threaded applications by minimizing synchronization overhead.
### Java 11: Long-Term Support and More
Java 11, released in September 2018, is a Long-Term Support (LTS) version, bringing numerous enhancements. Here are the top 5 features of Java 11:
**New HTTP Client**
A new HTTP client API for handling HTTP/2 and WebSocket communication. Example:
```java
HttpClient client = HttpClient.newHttpClient();
HttpRequest request = HttpRequest.newBuilder()
.uri(URI.create("https://tutorialq.com"))
.build();
HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());
System.out.println(response.body());
```
This simplifies HTTP communication, supporting modern web standards and asynchronous operations.
**String Methods**
Adds several useful methods to the `String` class, such as `isBlank`, `lines`, and `strip`. Example:
```java
String multiline = "Mahidhar\nSophia\nLiam";
multiline.lines().forEach(System.out::println);
```
These enhance string manipulation capabilities, making code more expressive and concise.
**Local-Variable Syntax for Lambda Parameters**
Allows `var` to be used in lambda expressions. Example:
```java
var list = List.of("Mahidhar", "Sophia", "Liam");
list.forEach((var name) -> System.out.println(name));
```
This provides consistency in variable declaration, improving code readability.
**Epsilon Garbage Collector**
A no-op garbage collector that handles memory allocation but does not reclaim memory. Useful for performance testing and short-lived applications where GC overhead is a concern.
**Running Java Files with `java`**
Allows single-file source-code programs to be executed without compilation. Example:
```sh
$ java HelloWorld.java
```
This simplifies testing and scripting by reducing the need for explicit compilation steps.
### Java 12: Performance and Productivity
Java 12, released in March 2019, introduced several performance and productivity enhancements. Here are the top 5 features of Java 12:
**Switch Expressions (Preview)**
Enhances switch statements with a new syntax and capabilities. Example:
```java
var result = switch (day) {
case MONDAY, FRIDAY, SUNDAY -> "Work day";
case TUESDAY -> "Soccer day";
default -> "Midweek day";
};
```
This simplifies complex switch logic, making code more readable and concise.
**JVM Constants API**
Introduces an API for modeling nominal descriptions of key class-file and run-time artifacts. This facilitates the analysis and transformation of bytecode, aiding in the development of tools and frameworks.
**Default CDS Archives**
Enables class-data sharing by default, improving startup time and memory footprint. This optimizes resource usage, particularly beneficial in containerized environments.
**Shenandoah GC (Experimental)**
A low-pause-time garbage collector designed for large heaps. This reduces garbage collection pause times, improving performance in applications with large memory requirements.
**Microbenchmark Suite**
Provides a set of microbenchmarks for assessing the performance of various JVM features. This helps developers understand and optimize the performance characteristics of their applications.
### Java 13: Incremental Improvements
Java 13, released in September 2019, continued the trend of incremental improvements. Here
are the top 5 features of Java 13:
**Text Blocks (Preview)**
Simplifies the creation of multiline strings. Example:
```java
String json = """
{
"name": "Mahidhar",
"age": 30
}
""";
```
This enhances readability and maintainability of code involving multiline strings.
**Switch Expressions (Second Preview)**
Further refines the switch expression feature introduced in Java 12. This continues to simplify and modernize switch statements, improving code clarity.
**Reimplementation of the Legacy Socket API**
Replaces the underlying implementation of the legacy socket API to improve performance and maintainability. This enhances network communication performance and reliability.
**Dynamic CDS Archives**
Extends class-data sharing to dynamically loaded classes. This further reduces startup time and memory usage by sharing more class data between applications.
**ZGC: Uncommit Unused Memory**
Enhances the Z Garbage Collector to return unused memory to the operating system. This optimizes memory usage, particularly in environments with fluctuating memory demands.
### Java 14: Productivity and Syntax
Java 14, released in March 2020, focused on productivity and syntactic enhancements. Here are the top 5 features of Java 14:
**Switch Expressions (Standard)**
Finalizes the switch expression feature, making it a standard language feature. Example:
```java
var result = switch (day) {
case MONDAY, FRIDAY, SUNDAY -> "Work day";
case TUESDAY -> "Soccer day";
default -> "Midweek day";
};
```
This simplifies complex switch logic, improving code readability.
**Records (Preview)**
Introduces records, a new way to declare data classes. Example:
```java
public record Person(String name, int age) {}
```
This reduces boilerplate code for data carriers, improving code simplicity and readability.
**Pattern Matching for instanceof (Preview)**
Simplifies type checks and casts. Example:
```java
if (obj instanceof String s) {
System.out.println(s.toUpperCase());
}
```
This reduces boilerplate code, making type checks and casts more concise and readable.
**Helpful NullPointerExceptions**
Enhances `NullPointerException` messages to include details about what was `null`. This improves debugging efficiency by providing more informative error messages.
**Non-Volatile Mapped Byte Buffers**
Improves the performance and reliability of file I/O operations. This enhances file I/O operations, particularly in applications dealing with large files or high I/O demands.
### Java 15: Language and Runtime Enhancements
Java 15, released in September 2020, introduced several language and runtime enhancements. Here are the top 5 features of Java 15:
**Text Blocks (Standard)**
Finalizes the text block feature, making it a standard language feature. Example:
```java
String json = """
{
"name": "Mahidhar",
"age": 30
}
""";
```
This simplifies the creation and maintenance of multiline strings.
**Sealed Classes (Preview)**
Allows the declaration of sealed classes, restricting which classes can extend or implement them. Example:
```java
public abstract sealed class Shape
permits Circle, Square, Rectangle {}
```
This provides more control over class hierarchies, enhancing code safety and maintainability.
**Hidden Classes**
Introduces hidden classes, intended for use by frameworks that generate classes at runtime. This improves performance and security for runtime-generated classes.
**Pattern Matching for instanceof (Second Preview)**
Further refines the pattern matching for `instanceof` feature. This continues to simplify type checks and casts, improving code readability.
**ZGC: Concurrent Class Unloading**
Enhances the Z Garbage Collector to unload classes concurrently, improving performance. This optimizes memory usage and performance in applications with dynamic class loading.
### Java 16: Improved Productivity and Performance
Java 16, released in March 2021, brought several productivity and performance enhancements. Here are the top 5 features of Java 16:
**Records (Standard)**
Finalizes the record feature, making it a standard language feature. Example:
```java
public record Person(String name, int age) {}
```
This reduces boilerplate code for data carriers, improving code simplicity and readability.
**Pattern Matching for instanceof (Standard)**
Finalizes the pattern matching for `instanceof` feature. Example:
```java
if (obj instanceof String s) {
System.out.println(s.toUpperCase());
}
```
This reduces boilerplate code, making type checks and casts more concise and readable.
**Sealed Classes (Second Preview)**
Further refines the sealed classes feature. This continues to provide more control over class hierarchies, enhancing code safety and maintainability.
**Foreign-Memory Access API (Incubator)**
Introduces an API for accessing foreign memory outside the Java heap. This facilitates the development of high-performance, memory-efficient applications that interact with native memory.
**Packaging Tool**
Provides a tool for packaging self-contained Java applications. This simplifies the distribution and deployment of Java applications, particularly in containerized environments.
### Java 17: Long-Term Support and More
Java 17, released in September 2021, is a Long-Term Support (LTS) version, bringing numerous enhancements. Here are the top 5 features of Java 17:
**Sealed Classes (Standard)**
Finalizes the sealed classes feature, making it a standard language feature. Example:
```java
public abstract sealed class Shape
permits Circle, Square, Rectangle {}
```
This provides more control over class hierarchies, enhancing code safety and maintainability.
**Pattern Matching for switch (Preview)**
Introduces pattern matching for switch statements. Example:
```java
switch (obj) {
case String s -> System.out.println("String: " + s);
case Integer i -> System.out.println("Integer: " + i);
default -> System.out.println("Unknown type");
}
```
This simplifies complex switch logic, improving code readability.
**Foreign Function & Memory API (Incubator)**
Introduces an API for calling native functions and accessing native memory. This facilitates the development of high-performance, memory-efficient applications that interact with native code.
**Context-Specific Deserialization Filters**
Enhances security by allowing context-specific deserialization filters. This improves security by providing fine-grained control over deserialization operations.
**New macOS Rendering Pipeline**
Introduces a new rendering pipeline for macOS based on the Apple Metal framework. This improves graphics performance and compatibility on macOS.
### Java 18: Performance and Simplicity
Java 18, released in March 2022, focused on performance and simplicity. Here are the top 5 features of Java 18:
**UTF-8 by Default**
Sets UTF-8 as the default character set for the Java runtime. This ensures consistent handling of character data across different platforms.
**Simple Web Server**
Introduces a simple web server for prototyping and testing. Example:
```java
jwebserver --port 8080
```
This simplifies the development and testing of web applications.
**Code Snippets in Java API Documentation**
Enhances API documentation with code snippets. This improves the usability and understanding of Java APIs.
**Vector API (Third Incubator)**
Introduces a vector API for expressing vector computations. This facilitates the development of high-performance, data-parallel applications.
**Foreign Function & Memory API (Second Incubator)**
Further refines the foreign function and memory API. This continues to facilitate the development of high-performance, memory-efficient applications that interact with native code.
### Java 19: Enhanced Performance and Productivity
Java 19, released in September 2022, brought several performance and productivity enhancements. Here are the top 5 features of Java 19:
**Virtual Threads (Preview)**
Introduces virtual threads for lightweight concurrency. This simplifies the development of high-concurrency applications by reducing the overhead of thread management.
**Pattern Matching for switch (Second Preview)**
Further refines the pattern matching for switch statements. This continues to simplify complex switch logic, improving code readability.
**Structured Concurrency (Incubator)**
Introduces an API for structured concurrency, making it easier to manage multiple tasks. This improves code reliability and readability by providing a structured approach to concurrency.
**Foreign Function & Memory API (Third Incubator)**
Further refines the foreign function and memory API. This continues to facilitate the development of high-performance, memory-efficient applications that interact with native code.
**Linux/RISC-V Port**
Adds support for the Linux/RISC-V architecture. This expands the platform support for Java, making it available on more hardware configurations.
### Java 20: Language and Performance Enhancements
Java 20, released in March 2023, focused on language and performance enhancements. Here are the top 5 features of Java 20:
**Virtual Threads (Second Preview)**
Further refines the virtual threads feature for lightweight concurrency. This continues to simplify the development of high-concurrency applications.
**Pattern Matching for switch (Third Preview)**
Further refines the pattern matching for switch statements. This continues to simplify complex switch logic, improving code readability.
**Record Patterns (Preview)**
Introduces record patterns for pattern matching with records. Example:
```java
record Point(int x, int y) {}
switch (obj) {
case Point(var x, var y) -> System.out.println("Point: (" + x + ", " + y + ")");
default -> System.out.println("Unknown type");
}
```
This simplifies pattern matching with record classes, enhancing code readability.
**Foreign Function & Memory API (Fourth Incubator)**
Further refines the foreign function and memory API. This continues to facilitate the development of high-performance, memory-efficient applications that interact with native code.
**Scoped Values (Incubator)**
Introduces scoped values for safe and efficient sharing of immutable data within and across threads. This enhances concurrency handling by providing a mechanism for thread-local data sharing.
### Java 21: Long-Term Support and More
Java 21, released in September 2023, is a Long-Term Support (LTS) version, bringing numerous enhancements. Here are the top 5 features of Java 21:
**Virtual Threads (Standard)**
Finalizes the virtual threads feature, making it a standard concurrency model. This simplifies the development of high-concurrency applications by reducing the overhead of thread management.
**Pattern Matching for switch (Fourth Preview)**
Further refines the pattern matching for switch statements. This continues to simplify complex switch logic, improving code readability.
**Record Patterns (Second Preview)**
Further refines record patterns for pattern matching with records. This continues to simplify pattern matching with record classes, enhancing code readability.
**Foreign Function & Memory API (Fifth Incubator)**
Further refines the foreign function and memory API. This continues to facilitate the development of high-performance, memory-efficient applications that interact with native code.
**Sequenced Collections**
Introduces sequenced collections to provide a common interface for collections with a defined iteration order. Example:
```java
SequencedCollection<String> seq = SequencedCollections.of("Mahidhar", "Sophia", "Liam");
seq.forEach(System.out::println);
```
This standardizes the iteration order, improving code predictability and reliability.
### Java 22: Latest Innovations
Java 22, released in March 2024, continues to build on the advancements of previous versions. Here are the top 5 features of Java 22:
**Enhanced Pattern Matching**
Extends pattern matching to more contexts, providing greater flexibility and expressiveness. Example:
```java
switch (obj) {
case String s && s.length() > 5 -> System.out.println("Long string: " + s);
case Integer i && i > 10 -> System.out.println("Large number: " + i);
default -> System.out.println("Other type");
}
```
This enhances code readability and maintainability by allowing more complex conditions in pattern matching.
**Universal Generics**
Introduces universal generics to simplify generic type declarations and improve type safety. Example:
```java
class Box<T extends Number> {
private T value;
public Box(T value) {
this.value = value;
}
public T getValue() {
return value;
}
}
```
This improves code reusability and type safety by allowing more flexible and powerful generic type declarations.
**Improved JSON Handling**
Enhances JSON handling capabilities with new APIs and improvements to existing ones. Example:
```java
JsonObject json = Json.createObjectBuilder()
.add("name", "Mahidhar")
.add("age", 30)
.build();
System.out.println(json.toString());
```
This simplifies working with JSON data, making it more efficient and intuitive.
**Optimized Garbage Collection**
Introduces further optimizations to garbage collection, reducing latency and improving performance. This enhances application responsiveness and stability, particularly in memory-intensive scenarios.
**Advanced Networking Features**
Adds advanced networking features to support the latest protocols and improve network performance. Example:
```java
HttpClient client = HttpClient.newBuilder()
.version(HttpClient.Version.HTTP_2)
.build();
HttpRequest request = HttpRequest.newBuilder()
.uri(URI.create("https://tutorialq.com"))
.build();
HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());
System.out.println(response.body());
```
This supports modern networking standards, improving application performance and interoperability.
Migrating to Java 17 or higher can bring significant benefits, but it also comes with challenges. Here are the top 5 issues you might encounter:
### 1. **Compatibility Issues**
- **Description**: Some libraries and frameworks may not be fully compatible with Java 17 or higher. This is particularly relevant for older or less-maintained dependencies.
- **Example**: If you are using an older version of a library that relies on deprecated or removed APIs, you may encounter compilation or runtime errors.
- **Solution**: Update all dependencies to their latest versions and check for compatibility with Java 17. Utilize tools like `jdeps` to analyze your dependencies and identify potential issues.
### 2. **Removed and Deprecated APIs**
- **Description**: Java 17 and higher have removed several APIs and features that were deprecated in previous versions. This can cause compilation errors if your code relies on these APIs.
- **Example**: The removal of the `Applets` API and the `Security Manager` can impact applications that still use these features.
- **Solution**: Refactor your code to replace deprecated APIs with their modern equivalents. Review the release notes for each Java version to understand which features have been removed and plan accordingly.
### 3. **Module System (JPMS)**
- **Description**: The introduction of the Java Platform Module System (JPMS) in Java 9 can complicate the migration process, especially for large, monolithic applications.
- **Example**: Splitting a large codebase into modules and ensuring that dependencies are properly managed can be challenging.
- **Solution**: Start by modularizing the most critical parts of your application and gradually refactor the rest. Use `jdeps` to help identify module dependencies and create module descriptors (`module-info.java`).
### 4. **New Garbage Collection Behavior**
- **Description**: Changes and improvements to garbage collection (GC) algorithms in newer Java versions can impact application performance and behavior.
- **Example**: The G1 garbage collector became the default in Java 9, and Java 17 includes further improvements. Applications with specific performance tuning for older GCs might need re-tuning.
- **Solution**: Test your application thoroughly with the new GC settings. Profile and monitor performance, and adjust GC tuning parameters as needed.
### 5. **Java Language and Syntax Changes**
- **Description**: New language features and syntax changes introduced in Java 17 and higher, such as records, sealed classes, and pattern matching, can require significant refactoring of your codebase.
- **Example**: Adopting new features like records and pattern matching might necessitate changes in your data classes and how you handle certain operations.
- **Solution**: Plan for incremental adoption of new language features. Ensure your development team is familiar with the latest Java enhancements and provide training if necessary.
### Additional Tips for a Smooth Migration
- **Automated Testing**: Ensure comprehensive automated tests are in place to quickly identify issues introduced by the migration.
- **CI/CD Pipeline**: Utilize continuous integration and continuous deployment pipelines to streamline the migration process and catch issues early.
- **Performance Testing**: Conduct thorough performance testing to identify any regressions and optimize accordingly.
- **Documentation**: Keep detailed documentation of the migration process, issues encountered, and solutions implemented to assist future migrations.
By being aware of these potential issues and planning accordingly, you can make your migration to Java 17 or higher smoother and more successful.
| tutorialq |
1,889,061 | SUR LE CHEMIN DU HACKING ! Kali Academy, trois mois d’initiation 👺 | Et oui 🙂 vous ne rêvez pas ! Je dis dis bien hacking ! Avant tout, mettons-nous d'accord sur la... | 0 | 2024-06-14T22:20:06 | https://dev.to/tacite243/sur-le-chemin-du-hacking-kali-academy-trois-mois-dinitiation-1k9m | webdev, javascript, beginners, programming | Et oui 🙂 vous ne rêvez pas ! Je dis dis bien hacking ! Avant tout, mettons-nous d'accord sur la terminologie “Hacking”. Les médias nous ont menti sur le hacking, ils confondent le hacking au cracking. Richard Stallman, un fervent défenseur du logiciel libre et fondateur du mouvement du logiciel libre, définit un hacker comme quelqu'un qui aime jouer avec des systèmes, comprendre leur fonctionnement interne et les améliorer. Le hacking, dans ce contexte, est un acte de créativité, d'innovation et de résolution de problèmes, souvent associé à la programmation informatique. C’est une part de vérité, le hacking est bien plus que cette définition, il est en soi un état d’esprit, une manière de penser… Je vous conseille de lire cet ouvrage pour en savoir plus sur cette littérature : “Hackers and Painters: Big Ideas from the Computer Age” de Paul Graham.
## Introduction
Dans cet article, je vais vous parler du parcours que propose Kali Academy aux jeunes développeurs pour les initier au Hacking. Kali Academy est une académie qui vise à promouvoir les valeurs de l'open source dans les régions les moins représentées notamment en Afrique, voir [le site de Kali Academy](https://kaliacademy.org/). J’ai personnellement été parmi les 10 stagiaires retenus pour la cohorte 2024 et c’est fut une énorme opportunité pour ma carrière de développeur, je me sens dans l’obligation de partager avec cette expérience assez passionnante. Avant d’entrer dans le vif du sujet, je tiens a préciser que je ne me considère pas hacker, et je ne me considérerai jamais hacker, c’est la pertinence de mon travail qui pourra me procurer ce titre.
Le parcours de stage chez Kali Academy est subdivisé en 3 parties :
1. les fondamentaux
2. la spécialisation Wikimédia et
3. le projet de fin de stage.
Mais avant de décortiquer ce programme apparemment, commençons par nous poser les bonnes questions en guise de fondamentaux 🙂. Qui construit et entretient l'infrastructure numérique sur laquelle nous nous appuyons au quotidien ? Quels sont les défis et les obstacles rencontrés par ceux qui travaillent à la construction et à la maintenance de cette infrastructure ? Quelles sont les implications sociales, politiques et économiques de la manière dont l'infrastructure numérique est construite et gérée ? Comment les décisions prises en matière d'infrastructure numérique affectent-elles la vie quotidienne des gens ? Quels sont les modèles de financement et de gouvernance de l'infrastructure numérique, et comment peuvent-ils être améliorés ? Comment pouvons-nous garantir que l'infrastructure numérique reste ouverte, accessible et équitable pour tous ? Ces questions semblent peut-être basiques, mais elles poussent à une très grande réflexion si on y consacre un peu d'attention.
## Sur quoi est basé notre infrastructure numérique ?
Selon Nadia Eghba, dans son livre (essaie) "Roads and Bridges: The Unseen Labor Behind Our Digital Infrastructure", il nous rappelle que toute notre infrastructure numérique est basée sur l’open source. Personnellement, lorsque j’ai lu ce passage, la première question je me suis demandé qui est derrière les projets open source, comment gagne-t-il sa vie…. C’est à ce moment que j'ai compris l’importance d’une contribution, même aussi petite soit-elle. Nous posons des questions sur des forums tels que stack overflow, mais est-ce qu’on se demande qui nous répond, ni même pourquoi il nous répond ? Nous lisons des articles sur ce site, et nous savons que leurs auteurs ne perçoivent rien comme droit d’auteur mais nous écrivent quand-même. C’est avec ces genres des questions qu’on devient hacker. Etes-vous toujours prêt à le devenir ? Si oui, demandes-toi quelle est ta part dans tout ça, combien de fois as-tu contribué dans un projet open source ou même partager publiquement et gratuitement tes connaissances ? L’open source ce n’est pas seulement dans l’informatique, la liberté d'être bien informé ne peut être garantie que si l’information est open source (souvenez-vous de l’affaire Wikileaks ayant conduit à l’arrestation de Julian Assange et Chelsea Manning), la connaissance ne peut-être universelle que si elle a été partagée (les brevets publiques) ! Voyons notre part dans tout ça, bien que minime soit-elle mais elle est là. C’est de cette manière que Kali Academy m’a amené à voir les choses, consacrer un peu de mon temps à faire découvrir aux autres ce que nous avons appris dans le but de faire évoluer la connaissance et de la démocratiser 🗽.
## GNU/Linux, l'OS des Hackers
Maintenant que nous avons découvert que toute notre infrastructure numérique est grandement basée sur de l’open source, rentrons dans le technique. GNU/Linux, savez-vous de quel animal s’agit-il ? 😂 On a souvent tendance à ne dire que Linux et laisser GNU, pourtant Linux n’est que le noyau. GNU est un projet de logiciel libre lancé par Richard Stallman en 1983. Le nom "GNU" est un acronyme récursif qui signifie "GNU's Not Unix", ce qui souligne que bien que GNU soit compatible avec Unix, il n'est pas dérivé de celui-ci. Le projet GNU a pour objectif de fournir un système d'exploitation libre, complet et cohérent composé entièrement de logiciels libres. GNU/Linux est le résultat de l'effort combiné de deux projets : le projet GNU, qui a fourni les outils et les utilitaires, et le noyau Linux, développé par Linus Torvalds. Cette collaboration a produit un système d'exploitation puissant, flexible et libre, qui a eu un impact significatif sur l'industrie informatique et la culture technologique mondiale. Dans mon parcours à Kali Academy, j’ai découvert qu’il est important pour un hackeur d’avoir une idée sur l'architecture d’un système d’exploitation, surtout GNU/Linux car il est open source, on peut se challenger à toucher dans son code et produire notre propre distribution, ce qui est du hacking au sens pur 🙂, ensuite il faut savoir l’installer sans assistance, manipuler bien la ligne de commande, construire des petits scripts bash, automatiser certaines tâches, manipuler l’environnement bureau…
## Git, la collaboration facilitée
Ensuite, il faut savoir très bien manipuler git, car c’est la base de la collaboration dans une équipe de développeurs, j’ai récemment commencé à publier une série d’article à sujet je vous invite à aller y jeter un coup d'œil. La plupart des plateformes collaboratives sont basées sur git. Git a pas mal évolué mais il reste intuitif de l’utiliser en CLI.
## les licences opens sources, le droit en ingénierie
Lorsque vous installez un logiciel open ou non, vous devez d'abord avoir accepter les termes de la licence. C’est un cas que vous avez déjà rencontré au moins une fois, mais si on n’est pas suffisamment informé, on néglige cette partie, ce qui nous amène à violer les licences. Pour moi, la plus grande victime c’est Microsoft, en tout cas dans le contexte de ma région, sur 1000 personnes que je connais, 900 utilisent Windows, et seulement 100 ont une licence, 50 l’ont payé et les autres ont des craques 😂. C'est triste, mais c’est ça la réalité, pourtant il y a un GNU/Linux gratuit et open source, le seul motif qu’on c’est que Linux est complexe, c’est qui une pure invention de ses concurrents. Cette situation a conduit Kali Academy à nous initier à la lecture des licences open source. Cette lecture nous a mis dans un grande confusion: un logiciel peut être open source mais pas libre, gratuit mais pas libre, libre mais avec une version payante, gratuit mais pas open source 😴. C’est embêtant non ! Mais ce qu’il faut retenir, c’est qu’une licence d'un logiciel est un contrat entre l'éditeur du logiciel et l'utilisateur qui définit les conditions d'utilisation du logiciel. Cette licence précise notamment si l'utilisateur est autorisé à installer le logiciel sur un ou plusieurs appareils, s'il peut le partager avec d'autres personnes, s'il peut le modifier, etc. En échange du respect de ces conditions, l'utilisateur est autorisé à utiliser le logiciel de manière légale.
Voyons maintenant la différence entre un logiciel Open source et un logiciel libre.
Les critères d'un logiciel libre, selon la Free Software Foundation (FSF, initiée par Richard Stallman) , sont les quatre libertés :
1. Liberté d'exécution :
Exemple de Licence : GNU General Public License (GPL)
La GPL permet aux utilisateurs d'exécuter le programme pour
n'importe quel usage.
2. Liberté d'étude :
Exemple de Licence : GNU General Public License (GPL)
La GPL garantit l'accès au code source, permettant aux utilisateurs
d'étudier et de modifier le programme.
3. Liberté de redistribution :
Exemple de Licence : GNU General Public License (GPL)
La GPL permet aux utilisateurs de redistribuer des copies du
programme, que ce soit en version originale ou modifiée.
4. Liberté de distribution des versions modifiées :
Exemple de Licence : GNU General Public License (GPL)
La GPL permet aux utilisateurs de distribuer des copies de leurs
versions modifiées, tout en conservant les mêmes libertés pour les
autres utilisateurs.
Les critères d'un logiciel open source, selon l'Open Source Initiative (OSI), incluent les éléments suivants :
1. Libre redistribution :
Exemple de Licence : MIT License
La MIT License permet la distribution du logiciel sans restriction.
2. Code source :
Exemple de Licence : Apache License 2.0
La licence Apache 2.0 exige que le code source soit disponible.
3. Travaux dérivés :
Exemple de Licence : BSD License
La BSD License permet la modification et la distribution de travaux
dérivés sous les mêmes conditions.
4. Intégrité du code source de l'auteur :
Exemple de Licence : Mozilla Public License 2.0
La MPL 2.0 permet les modifications tout en exigeant que les
fichiers modifiés soient redistribués sous la même licence.
5. Pas de discrimination contre des personnes ou des groupes :
Exemple de Licence : MIT License
La MIT License ne discrimine personne.
6. Pas de discrimination contre des domaines d'application :
Exemple de Licence : Apache License 2.0
La licence Apache 2.0 ne limite pas l'utilisation du logiciel à
certains domaines.
7. Distribution de la licence :
Exemple de Licence : GNU General Public License (GPL)
La GPL assure que les droits sont transférés à tous les
destinataires du programme.
8. Licence non spécifique à un produit :
Exemple de Licence : BSD License
La BSD License n'exige pas que le programme soit partie intégrante
d'un produit spécifique.
9. Licence non restrictive pour d'autres logiciels :
Exemple de Licence : Apache License 2.0
La licence Apache 2.0 ne pose pas de restrictions sur les logiciels
distribués avec le programme.
10. Licence technologiquement neutre :
Exemple de Licence : MIT License
La MIT License ne fait pas référence à une technologie spécifique.
Mais ce qu’il faut retenir c’est que tout logiciel libre est open source mais tout logiciel open source n’est pas libre, il y a aussi des gratuiciels (logiciel gratuit mais pas open source). Je vous recommande de mettre, en commentaire, des exemples d'applications ayant telle ou telle autre licence précitée.
## Wikimédia, écosystème open source par excellence
C’est dans cela que nous avons passé la majeure partie du premier mois, on avait autant d’ouvrages à consulter, des documentations à parcourir et des ateliers à suivre et parfois partager quand bien même on n’a pas bien assimilé la leçon, bref c'était très intense. Ces connaissances acquises ne pouvaient nous aider en rien si on n’avait pas une bonne communauté où les expérimenter. Il est bien d’avoir une houe, mais il encore mieux de l’essayer au champ 🙂, c’est pourquoi dans le deuxième moi de mon stage chez Kali Academy, nous nous sommes maintenant intéressés aux projets open source, nous avons d’abord cherché de nous même, je me souviens j’avais forké un repo de “awesome” où j’ai eu trop de mal à contribuer et mon PR n’avait même pas été validé, mais mon coach m’a consolé en disant “le plus important c’est que tu as réussi à cloner le projet, à runer le projet et à résoudre l’issue, peut importe que ton PR soit mergé ou pas”, et c'est une des leçons que je garde à cœur. Ensuite, Kali nous a proposé d’approcher l’écosystème Wikimédia qui est de nos jours un des plus grands projets open sources avec son MediaWiki qui est le moteur qui propulse Wikipédia et son projet frères ainsi que d’autres wiki. C’était comme une forte immersion arrivée soudainement. Nous avions d’abord participé à un événement de code que Wikimédia a choisi de nommer “Wishathon”, au cours duquel il fallait corriger quelques bogues et résoudre certains issues dans les projets ciblés dans l’écosystème, c’était très intenses pour nous étant donné que c’était une première fois de nous retrouver dans ces genres d’événement, encore que c’était un événement mondial, je m'étais retrouvé en train de travailler avec un turc aussi débutant que moi en Anglais 😂, mais c’était wow. Ensuite, pour comprendre un peu comment faire mes premières contributions sur Wikipédia, Wikidata, wiki Common …. j’ai postulé à une bourse de la fondation Moleskine laquelle m’a permis de suivre tout cela en seulement 5 séances intenses. J’ai appris à installer MediaWiki de différentes façons, à créer des thèmes, des extensions …. C’était vraiment chouette cette aventure. Ouf ! 😣J’ai oublié de vous révéler une petite confidence, au cours du Wishathon j’ai reçu un gift venu expressément des USA, c’était un moment très émouvant !
## Initier un projet open source
Normalement l’initiation à l’open source devrait s’achever là, mais Kali Academy a souhaité que nous puissions initier aussi des projets open source sur lesquels d’autres personnes vont aussi contribuer. Dans ce cadre, j’ai été mis dans une équipe où on était à trois, moi, mon ami que j’appelle toujours beau frère Firmin NGANDULI et le petit Christian BIREGO, un très bon geek. Ensemble, on a travaillé sur une application nommée LeaderBoard qui compare les contributions des bénévoles sur les projets Wikimédia et les classes en fonction du nombre des contributions. Voici le lien de l’application déployée [ici](https://wikileaderboard.netlify.app/) et de la documentation [ici](https://meta.wikimedia.org/wiki/Documentation_LeaderBoard)… Si vous êtes intéressé par ce projet, dites-le moi aussi en commentaire.
En bref, c’est à ça qu'à ressemblé mon parcours de stage chez Kali Academy, c'était une expérience extrêmement passionnante, j’ai goûté un peu au code professionnel, à l’expertise des grands développeurs open source de Wikimédia… Je remercie Kali Academy pour m’avoir offert cette opportunité, malgré mon niveau et mes faiblesses, je remercie également tous mes collègues avec lesquels on a fait ce parcours ainsi que vous tous qui avez lu cet article jusqu’ici, je vous prie de me faire des corrections en privé s’il en y a 🙂. Ainsi commence mon parcours d’apprenti hacker, à nous revoir dans le future 🙂, étant déjà hackeur 😂 | tacite243 |
1,889,064 | Computer Science Challenge: Algorithm | This is a submission for DEV Computer Science Challenge v24.06.12: One Byte Explainer. ... | 0 | 2024-06-14T22:17:06 | https://dev.to/izuchi/computer-science-challenge-algorithm-2dl | devchallenge, cschallenge, computerscience, beginners | *This is a submission for [DEV Computer Science Challenge v24.06.12: One Byte Explainer](https://dev.to/challenges/cs).*
## Explainer
An algorithm is a recipe for computers – it tells them how to solve problems step by step. It's crucial in CS for designing efficient solutions, ensuring accuracy in tasks like sorting data, searching info, and optimizing software and hardware.
## Additional Context
The cover image for this post is generated by Gemini – an AI assistant app developed by Google.
Algorithms play a fundamental role in the development, functioning, and performance of AI systems like Gemini.
Algorithms underpin every aspect of AI development, from data processing and model training to real-time decision-making and continuous improvement. The effectiveness and sophistication of AI apps like the Gemini AI assistant are directly linked to the quality and innovation of the algorithms it employs. | izuchi |
1,889,027 | Afinal, o que são os 0's e 1's? | Você já deve ter ouvido por aí que o computador "só entende 0's e 1's". Mas de onde vem esses 0's e... | 0 | 2024-06-14T22:15:43 | https://dev.to/xornotor/afinal-o-que-sao-os-0s-e-1s-3jdb | digital, electronics, computerscience, circuits | Você já deve ter ouvido por aí que o computador "só entende 0's e 1's". Mas **de onde vem esses 0's e 1's**? O que eles representam?
---
## Analógico vs. Digital
Antigamente, os sistemas eletrônicos lidavam com a informação de forma analógica, ou seja, os sinais elétricos que representavam a informação podiam assumir uma infinidade de amplitudes de tensão.
Exemplo: Rádio AM, Rádio FM, TV Analógica.
Todos os sistemas são suscetíveis a ruído, e para informação representada de modo analógico, isto é um grande problema, pois o processamento de sinais analógicos depende de alta precisão na amplitude, a qual é bastante afetada pelo ruído.
<sup><sub>Fonte: https://www.predig.com/whitepaper/reducing-signal-noise-practice</sub></sup>
A codificação digital veio como uma forma de reduzir erros decorrentes do ruído, e para isso, a informação é representada apenas em regiões de tensão bem definidas.
(Isso não significa que sistemas digitais são totalmente imunes a erros.)
<sup><sub>Fonte: https://www.predig.com/whitepaper/reducing-signal-noise-practice</sub></sup>
---
## Sinal digital
No geral, um sinal digital pode assumir dois níveis de tensão:
- 0 V, ao qual atribuímos o valor lógico 0;
- 5 V / 3,3 V / 1,8 V / etc. (dependendo da tecnologia de implementação), ao qual é atribuído o valor lógico 1.
Em computação, o "valor lógico" é chamado de `bit` (abreviação de _binary digit_, ou dígito binário).
Todos aqueles 0's e 1's dos quais você ouve falar são representados fisicamente pelo fluxo de sinais elétricos, os quais são controlados por meio de dispositivos eletrônicos.
---
## Transistores e Portas Lógicas
Em circuitos digitais modernos, os dispositivos utilizados para controlar tais sinais são os transistores.
Transistores são compostos de materiais semicondutores dispostos de maneira inteligente, de modo que podem ser utilizados como chaveadores.
"Ah, mas como assim chaveadores?"
Pense em um interruptor de lâmpada: podemos **LIGÁ-LO** ou **DESLIGÁ-LO**.
Do mesmo modo, o transistor pode ser controlado para permitir ou bloquear a passagem de corrente elétrica.
Os transistores são utilizados para construir arranjos levemente mais complexos, aos quais chamamos de "portas lógicas".
Tais componentes recebem sinais digitais de entrada e retornam um sinal digital como saída, executando uma operação lógica.
Antes de partir para as portas lógicas:
Assim como chamamos os dois estados de um interruptor de **LIGADO** e **DESLIGADO**, também podemos atribuir significado ao 1 e ao 0, aos quais geralmente chamamos de **TRUE** e **FALSE** (**VERDADEIRO** e **FALSO**), respectivamente.
---
### Porta lógica AND
A porta lógica AND (em português, E) recebe várias entradas e retorna uma saída.
Tal porta retorna verdadeiro (1) se todas as entradas são verdadeiras (1) ao mesmo tempo; caso contrário, ela retorna falso (0).
Q = A e B
---
### Porta lógica OR
A porta OR (OU) funciona de outra forma:
Dentre as várias entradas, basta que pelo menos uma delas seja verdadeira (1) para que a saída seja verdadeira (1)
Q = A ou B
---
### Porta lógica XOR
A porta XOR (OU EXCLUSIVO) funciona de forma diferente: Dadas duas entradas, apenas uma das duas deve receber um sinal verdadeiro (1) para que a saída seja verdadeira (1), o que significa: OU A, OU B (A E B ao mesmo tempo retorna 0)
Q = ou A, ou B
---
### Porta lógica NOT
A porta NOT (NÃO) recebe apenas uma entrada, e como o próprio nome diz, o estado lógico da entrada é invertido na saída
Q = não A
---
### Porta lógica NAND
A porta NAND (NÃO E) é literalmente o contrário da porta AND: só sai falso (0) se todas as entradas forem verdadeiras (1) ao mesmo tempo. É basicamente a mesma coisa que pegar uma porta AND e colocar uma porta NOT na saída.
Q = não (A e B)
---
### Porta lógica NOR
Do mesmo modo, a porta NOR (NÃO OU) é o contrário da porta OU: basta que pelo menos uma das entradas seja verdadeira (1) para que a porta retorne falso (0). É basicamente a mesma coisa que pegar uma porta OR e colocar uma porta NOT na saída.
Q = não (A ou B)
---
### Porta lógica XNOR
A porta XNOR (NÃO OU EXCLUSIVO) também é chamada de "porta coincidência", pois ela retorna verdadeiro (1) se suas duas entradas forem iguais. É a mesma coisa de pegar uma porta XOR e colocar uma porta NOT na frente.
Q = não (ou A, ou B)
---
## Paralelo entre portas lógicas e programação
Em programação, podemos pensar nos laços condicionais como "aplicações de portas lógicas".
Geralmente, quando programamos um `if`, estabelecemos condições para que um determinado bloco de código seja executado. Cada condição pode ser pensada como um bit (0 se for falsa, 1 se for verdadeira). Podemos fazer operações com esses bits, como se estivéssemos usando portas lógicas. Na maioria das linguagens de programação, podemos usar os operadores `&&`, `||` e `!` para as operações **AND**, **OR** e **NOT**, respectivamente. Estes operadores são chamados de **operadores lógicos**.
Para além das condicionais, podemos utilizar operações correlatas às portas lógicas para comparar números bit a bit por meio dos **operadores _bitwise_**. Para tratar deste assunto com mais profundidade, é necessário explicar sobre sistemas de numeração, o que provavelmente será feito em um artigo futuro.
---
## Associações de portas lógicas
Portas lógicas podem ser associadas e conectadas entre si para formar circuitos mais complexos. No geral, é possível construir dois tipos de circuitos:
- **Circuitos combinacionais**, que propagam os sinais de entrada pelas portas lógicas até a saída, sem realimentação;
- **Circuitos sequenciais**, que possuem realimentação arranjada de forma inteligente, formando as peças básicas que constituem o que conhecemos como **memória**.
Um exemplo de circuito combinacional é o circuito da imagem abaixo (as bolinhas nas entradas representam portas NOT). Os circuitos sequenciais provavelmente serão tratados em um futuro artigo.
---
## Álgebra Booleana
Além de diagramas, podemos representar os circuitos combinacionais como expressões algébricas, com base na **Álgebra Booleana**.
A álgebra booleana foi criada por George Boole, um matemático inglês, durante o século XIX. Com o tempo, o trabalho de Boole se provou útil para representar algebricamente as possíveis relações e operações envolvendo informações binárias.
Representando as portas lógicas por meio da álgebra booleana:
| Porta lógica | Expressão algébrica |
|--------------|---------------------|
| **NOT** | {% katex inline %} Q = \overline{A} {% endkatex %}, ou {% katex inline %} Q = A' {% endkatex %} |
| **AND** | {% katex inline %} Q = A \cdot B {% endkatex %} |
| **NAND** | {% katex inline %} Q = \overline{A \cdot B} {% endkatex %}, ou {% katex inline %} Q = (A \cdot B)' {% endkatex %} |
| **OR** | {% katex inline %} Q = A + B {% endkatex %} |
| **NOR** | {% katex inline %} Q = \overline{A + B} {% endkatex %}, ou {% katex inline %} Q = (A + B)' {% endkatex %} |
| **XOR** | {% katex inline %} Q = A \oplus B {% endkatex %} |
| **XNOR** | {% katex inline %} Q = A \odot B {% endkatex %} |
Assim como em expressões aritméticas, expressões booleanas também possuem suas propriedades de operação, algumas delas representadas abaixo.
---
## Bilhões de portas lógicas!
Circuitos integrados, ou chips, como são popularmente conhecidos, costumam conter circuitos muito mais complexos e com bilhões de transistores formando um incrível número de portas lógicas, arranjadas de modo inteligente para executar várias funções.
Tomemos como exemplo processadores de computador e de smartphone: várias portas lógicas são arranjadas para formar a Unidade Lógica e Aritmética (ULA), a qual é responsável por efetuar operações matemáticas; Registradores, que guardam temporariamente dados que são utilizados para executar instruções; a Unidade de Controle, que é responsável por disparar os sinais elétricos responsáveis por gerenciar o fluxo de dados no processador e comunicação do processador com periféricos; dentre outras funcionalidades.
Caso tenha curiosidade em entender melhor como é o processo de fabricação de microchips, recomendo o seguinte vídeo:
{% embed https://www.youtube.com/watch?v=dX9CGRZwD-w %} | xornotor |
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