id int64 5 1.93M | title stringlengths 0 128 | description stringlengths 0 25.5k | collection_id int64 0 28.1k | published_timestamp timestamp[s] | canonical_url stringlengths 14 581 | tag_list stringlengths 0 120 | body_markdown stringlengths 0 716k | user_username stringlengths 2 30 |
|---|---|---|---|---|---|---|---|---|
1,900,704 | @Resource: The Versatile Bean Injection Annotation for Jakarta EE and Spring | This annotation does bean injection, like the @Autowired and @Inject annotations. This annotation... | 27,602 | 2024-06-26T22:30:00 | http://springmasteryhub.com/?p=224 | java, springboot, spring, programming |
This annotation does bean injection, like the `@Autowired` and `@Inject` annotations.
This annotation is packaged with Jakarta EE and will work on your Spring projects.
You can use this annotation almost in the same way you use the other annotations used to inject dependencies.
Using in-field injection and set methods is possible, but constructors are not supported.
It can match the type and the bean name definition. Also, you can combine it with the @Qualifier annotation.
It can simplify migrating projects between Jakarta and Spring.
Let’s take a look at some examples of how to use it.
### Field Injection with @Resource
This is the standard way, using above the field that will be injected.
```java
@Repository
public class MyRepository {
}
@Component
public class MyService {
@Resource
private MyRepository myRepository;
}
```
### Setter Injection
Another alternative to injecting beans with `@Resource` is to use the setter method.
```java
@Repository
public class MySetterRepository {
}
@Component
public class MySetterService {
private static final Logger log = LoggerFactory.getLogger(MySetterService.class);
private MySetterRepository mySetterRepository;
@Resource
public void setMySetterRepository(MySetterRepository mySetterRepository) {
this.mySetterRepository = mySetterRepository;
}
}
```
### Combining with @Qualifier
You can use the `@Resource` annotation combined with the `@Qualifier` in the same way you would do when using the `@Autowired`.
```java
@Repository("anotherRepository")
public class AnotherRepository {
}
@Repository("specificRepository")
public class SpecificRepository {
}
@Component
public class MyQualifierService {
@Resource
@Qualifier("specificRepository")
private SpecificRepository specificRepository;
public void performService() {
specificRepository.doSomething();
}
}
```
### Matching by Name: The 'name' Attribute
If you do not want to use the `@Qualifier` annotation, you can use the `name` attribute from the `@Resource` annotation, to define the bean which will be injected.
```java
@Repository("anotherRepository")
public class AnotherRepository {
}
@Repository("specificRepository")
public class SpecificRepository {
}
@Component
public class MyNameService {
@Resource(name = "specificRepository")
private SpecificRepository specificNameRepository;
}
```
### Conclusion
In this blog post, you learned about the `@Resouce` an alternative to the `@Autowired` annotation to inject beans, that can work both with Jakarta and Spring.
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 |
1,901,793 | Gecko: Making a programming language is hard 😮💨 | Seemingly every programmer has a dream, making a programming language. It's not a bad idea, really,... | 0 | 2024-06-26T22:07:19 | https://dev.to/neutrino2211/gecko-making-a-programming-language-is-hard-4g0a | go, projects, programming |
Seemingly every programmer has a dream, making a programming language. It's not a bad idea, really, making a programming language fuelled by your ideas of what makes the 'perfect language' is exciting but... the process is not for the faint at heart.
## The Idea
I first thought of making a programming language back in 2018 and made something that's compiled to a custom bytecode format
{% embed https://twitter.com/neutrino2211/status/1067941123904233473 %}
I was very happy and continued to work on it but after a few experiments, I found the bytecode approach a bit much because not only did I have to compile the initial code to the byte code, I also had to write an interpreter for the new bytecode. So I took a break to think more on the project
About 18 months later I came back to it with a new approach, "A better C" (control yourself)
That was the obvious way, surely a programming language that worked like C but had friendly syntax and protections for typing and memory made sense, it made so much sense that it did not occur to me that many other people have had the exact same idea... but we move.
The idea was to have Go-like modules but typescript like type definitions and strong C-interop
```typescript
package main
cimport "stdio.h"
declare func printf (format: string, value: unknown): void
const PI: float = 3.14159
external func main (argc: int, argv: [char]) {
let PI: float = 3
const value: float = PI * 2
const vertices: [4][4][3]int = [
[
[10,10,10],
[20,20,20],
[30,30,30],
[40,40,40]
],
[
[10,10,10],
[20,20,20],
[30,30,30],
[40,40,40]
],
[
[10,10,10],
[20,20,20],
[30,30,30],
[40,40,40]
],
[
[10,10,10],
[20,20,20],
[30,30,30],
[40,40,40]
]
]
printf("%s\n", value)
}
```
It's nice to have an idea, but what about the implementation? How does this get compiled to something "that worked like C"?
Simple... Just use LLVM
## LLVM Dragon, please let me pass...
If it wasn't obvious with the way I mentioned it, let me do so now, explicitly. LLVM is hard to use, very hard.
To use LLVM, one needs to understand low level concepts like the stack, registers, code sections and more. Luckily I had a bit of experience with ASM and was able to pick up a few concepts but it became obvious that LLVM is a completely different beast (huh, that Dragon makes a bit more sense now)
I began with trying to transpile gecko code into LLIR which makes it relatively easy to compile it into machine code using the LLVM llc program. LLIR though, has a deceptive simplicity. The following LLIR produces a valid program.
```llir
; Declare the string constant as a global constant.
@.str = private unnamed_addr constant [13 x i8] c"hello world\0A\00"
; External declaration of the puts function
declare i32 @puts(ptr nocapture) nounwind
; Definition of main function
define i32 @main() {
; Call puts function to write out the string to stdout.
call i32 @puts(ptr @.str)
ret i32 0
}
```
When the program is compiled (and linked with LibC), the program runs and prints "hello world"
So I try to compile the code into some LLIR, here's the gecko code and the generated IR
```typescript
package main
declare external variardic func printf(format: string)
let GLOBAL_INT: int = 30
func main (): int {
let hello: string = &"Another number %d\n"
printf(&"A number %d\n", 90)
printf(&"A string %s\n", &"HH")
printf(hello, GLOBAL_INT)
return GLOBAL_INT
}
```
```llir
@.str.62155066001881480236677007312335 = private global [19 x i8] c"Another number %d\0A\00"
@.str.07706532071200013720435667563218 = private global [13 x i8] c"A number %d\0A\00"
@.str.57386676364818780036674824687336 = private global [13 x i8] c"A string %s\0A\00"
@.str.05610270252163716520553770318821 = private global [3 x i8] c"HH\00"
declare ccc void @printf(i8* %format, ...)
define ccc i64 @main() {
main$main:
%0 = getelementptr [19 x i8], [19 x i8]* @.str.62155066001881480236677007312335, i8 0
%1 = getelementptr [13 x i8], [13 x i8]* @.str.07706532071200013720435667563218, i8 0
call void @printf([13 x i8]* %1, i64 90)
%2 = getelementptr [13 x i8], [13 x i8]* @.str.57386676364818780036674824687336, i8 0
%3 = getelementptr [3 x i8], [3 x i8]* @.str.05610270252163716520553770318821, i8 0
call void @printf([13 x i8]* %2, [3 x i8]* %3)
call void @printf([19 x i8]* %0, i64 30)
ret i64 30
}
```
And yes, it runs!!!
With that done, the rest should be easy right?
## Skill Issues
This is where my knowledge tapped out, I can figure out how strings are represented in memory but I already had enough issues figuring out variardic functions exist. So it became very evident very quickly that I am not suited to figure much more out.
Something like... branches.
As of writing this, I still have not figured out how branches are to work as I made a few wrong assumptions about them and the github branch (how poetic) still has ongoing rework.
But what's worse than branches? Arrays!
As I mentioned earlier, LLIR is deceptively simple.
Given the following C code...
```c
#include <stdio.h>
char* get_hello() {
char* r = "Hello";
return r;
}
int main(int argc, char** argv) {
char* names[3] = {"One", "Two", get_hello()};
printf("name: %s, arr[0]: %s\n", argv[3], names[1]);
}
```
The following LLIR gets generated
```llir
@.str = private unnamed_addr constant [6 x i8] c"Hello\00", align 1
@.str.1 = private unnamed_addr constant [4 x i8] c"One\00", align 1
@.str.2 = private unnamed_addr constant [4 x i8] c"Two\00", align 1
@.str.3 = private unnamed_addr constant [22 x i8] c"name: %s, arr[0]: %s\0A\00", align 1
; Function Attrs: noinline nounwind optnone ssp uwtable(sync)
define ptr @get_some() #0 {
%1 = alloca ptr, align 8
store ptr @.str, ptr %1, align 8
%2 = load ptr, ptr %1, align 8
ret ptr %2
}
; Function Attrs: noinline nounwind optnone ssp uwtable(sync)
define i32 @main(i32 noundef %0, ptr noundef %1) #0 {
%3 = alloca i32, align 4
%4 = alloca ptr, align 8
%5 = alloca [3 x ptr], align 8
store i32 %0, ptr %3, align 4
store ptr %1, ptr %4, align 8
%6 = getelementptr inbounds [3 x ptr], ptr %5, i64 0, i64 0
store ptr @.str.1, ptr %6, align 8
%7 = getelementptr inbounds ptr, ptr %6, i64 1
store ptr @.str.2, ptr %7, align 8
%8 = getelementptr inbounds ptr, ptr %7, i64 1
%9 = call ptr @get_some()
store ptr %9, ptr %8, align 8
%10 = load ptr, ptr %4, align 8
%11 = getelementptr inbounds ptr, ptr %10, i64 3
%12 = load ptr, ptr %11, align 8
%13 = getelementptr inbounds [3 x ptr], ptr %5, i64 0, i64 1
%14 = load ptr, ptr %13, align 8
%15 = call i32 (ptr, ...) @printf(ptr noundef @.str.3, ptr noundef %12, ptr noundef %14)
ret i32 0
}
declare i32 @printf(ptr noundef, ...) #1
```
I tried a lot of ways to generate similar LLIR but there were a lot of errors getting any of it to run/compile properly. This, also as of writing, is currently unresolved.
So, if my attempt to use LLVM is bringing more issues than progress, what can I do at this point?
## The C Backend
Up until this point, gecko has only transpiled to LLIR but since that is becoming a problem, I decided to transpile to C instead. Something I understand and can implement multiple features for, struct-based classes, loops, branches, lists and more.
But the AST and compiler were so heavily expectant on the backend being LLVM that I needed to do a whole rewrite of the interface between the AST, Compiler and whatever does the transpiling.
About a thousand loc later, I managed to move the LLVM implementation into a backend interface but that was just part one. I needed to implement the C backend, and a few hundred more lines of code later, I had a C backend that could use clang/gcc to compile the code into machine code.
With this, I tested classes and C interop.
Given the following gecko code
```typescript
package std.types
declare external variardic func printf(format: string!): int
class String {
private let _str: string = &""
public func init(str: string): String* {
let self: String
self._str = str
printf("Init string '%s'\n", str)
return &self
}
public func size(self: String*): int {
return sizeof(*self)
}
func printSelf(self: String*): void // An idea I was experimenting with (methods with no bodies are virtual and need implementing)
}
```
Compiling the code into an object file, it generates the following header file (Gecko code compiled as libraries generate an object file and a corresponding .h file. gecko/gecko.h being the little gecko std lib I made)
```c
//Gecko standard library
#include <gecko/gecko.h>
int printf(const string format,...);
typedef struct {
string _str;
} std__types__String;
std__types__String* std__types__String__init(string str);
int std__types__String__size(std__types__String* self);
void std__types__String__printSelf(std__types__String* self);
```
And by compiling the following C code along with the output object file...
```c
#include "./class.gecko.h"
#include <stdio.h>
void std__types__String__printSelf(std__types__String* str) {
printf("My string '%s'\n", str->_str);
}
int main() {
std__types__String* str = std__types__String__init("Hello world");
str->_str = "Second Hello World";
int sizeOfString = std__types__String__size(str);
std__types__String__printSelf(str);
printf("Size of Gecko String %d\n", sizeOfString);
}
```
It runs!!!
## Conclusion
That's where I am. Making a programming language has been an educational but seriously difficult process and all that I've discussed is only in regards to what I have experienced in the language implementation details.
But the bugs... the bugs.. Oh God.
### Golang Nil Errors
Golang has an annoying habit of giving you a gift box with nothing inside and then complaining that the box has nothing inside when you give it back. This inspired me to create a package to have [rust-like errors in Golang](https://github.com/neutrino2211/go-result).
I need to refactor a lot of the code to use this package (plus I called it go-option not go-result).
_EDIT: Finally renamed it to go-result_
### Refactoring & Rewrites
I've rewritten this language three times
- Once because I forgot to factor in loops into the AST and compilation until the codebase was spaghetti and needed fixing
- Once I rewrote it into C++ because I thought Go was the problem
- And finally rewrote the code in Go again because I figured out I was the problem
And refactored more than I remember
- Refactored code lexing once
- Refactored transpiling and compiling the code
- Used a custom CLI parsing library I made
- Refactored the CLI parsing into a new library
- Refactored the C++ lexer to use a state machine
### Final Thoughts
Making a programming language is exciting but if you are not in it for the long haul, you can get very demotivated and the passion can drain.
So please, before you start. Learn a bit of how to make a programming language and read what I think people believe is [the unofficial manual](https://craftinginterpreters.com/) on making programming languages.
Oh, and celebrate your little wins! :)
{% embed https://twitter.com/neutrino2211/status/1724224918328414279 %}
_psst, hey. if you are interested, I have a [new blog](https://mainasara.dev) where I sometimes post things that don't get on here. Consider subscribing to it's RSS ;)_ | neutrino2211 |
1,901,888 | Webview em QML (Qt Modeling Language) | Introdução O código a seguir é um exemplo de uma aplicação básica em QML (Qt Modeling... | 0 | 2024-06-26T22:06:05 | https://dev.to/moprius/webview-em-qml-qt-modeling-language-67k | qml, webview, website, qt | ## Introdução
O código a seguir é um exemplo de uma aplicação básica em QML (Qt Modeling Language) que cria uma janela de aplicação que incorpora um visualizador de web (WebEngineView) para exibir a página do Google. Ele inclui funcionalidades como um menu de contexto, ícone de bandeja do sistema (SystemTrayIcon), e um histórico de URLs visitadas. A aplicação também possui vários itens de menu para interações adicionais, como copiar, colar, cortar, selecionar tudo, atualizar, zoom in, zoom out, e abrir o URL em um navegador externo. Vamos as explicação do código
### Código completo
```
import QtQuick 2.15
import QtQuick.Controls 2.15
import QtQuick.Layouts 1.15
import QtWebEngine 1.10
import Qt.labs.platform 1.1
ApplicationWindow {
id: window
visible: true
width: 1024
height: 768
title: "Google"
WebEngineView {
id: webEngineView
anchors.fill: parent
url: "https://www.google.com"
onUrlChanged: {
historyModel.append({url: webEngineView.url.toString()})
}
}
ListModel {
id: historyModel
}
ListView {
id: historyView
width: parent.width
height: 200
model: historyModel
delegate: Text {
text: url
}
visible: false // Defina como true para visualizar o histórico
}
MouseArea {
anchors.fill: parent
acceptedButtons: Qt.RightButton
onPressed: {
if (mouse.button == Qt.RightButton) {
contextMenu.open(mouse.x, mouse.y)
}
}
}
Menu {
id: contextMenu
MenuItem {
text: qsTr("Copy")
onTriggered: webEngineView.triggerWebAction(WebEngineView.Copy)
}
MenuItem {
text: qsTr("Paste")
onTriggered: webEngineView.triggerWebAction(WebEngineView.Paste)
}
MenuItem {
text: qsTr("Cut")
onTriggered: webEngineView.triggerWebAction(WebEngineView.Cut)
}
MenuItem {
text: qsTr("Select All")
onTriggered: webEngineView.triggerWebAction(WebEngineView.SelectAll)
}
MenuItem {
text: qsTr("Refresh")
onTriggered: webEngineView.triggerWebAction(WebEngineView.Reload)
}
MenuItem {
text: qsTr("Zoom In")
onTriggered: { webEngineView.zoomFactor += 0.1; }
}
MenuItem {
text: qsTr("Zoom Out")
onTriggered: { webEngineView.zoomFactor -= 0.1; }
}
MenuItem {
text: qsTr("Open in external browser")
onTriggered: {
Qt.openUrlExternally(webEngineView.url)
}
}
}
SystemTrayIcon {
id: trayIcon
visible: true
icon.source: "./imagens/google.png" // No caso a pasta onde está a imagem do ícone
menu: Menu {
MenuItem {
text: "Open"
onTriggered: {
window.show()
window.raise()
window.requestActivate()
}
}
MenuItem {
text: "Open Specific URL"
onTriggered: {
webEngineView.url = "http://www.google.com"
window.show()
window.raise()
window.requestActivate()
}
}
MenuItem {
text: "Toggle History View"
onTriggered: {
historyView.visible = !historyView.visible
}
}
MenuItem {
text: "Settings"
onTriggered: {
// Implemente a lógica para abrir a janela de configurações
}
}
MenuItem {
text: "Exit"
onTriggered: Qt.quit()
}
}
onActivated: reason => {
if (reason === SystemTrayIcon.Trigger) {
if (window.visible) {
window.hide()
} else {
window.show()
window.raise()
window.requestActivate()
}
}
}
}
onClosing: {
close.accepted = false;
window.hide();
}
Component.onCompleted: {
trayIcon.show()
}
}
```
### Explicação do Código
```
import QtQuick 2.15
import QtQuick.Controls 2.15
import QtQuick.Layouts 1.15
import QtWebEngine 1.10
import Qt.labs.platform 1.1
```
Esses comandos importam os módulos necessários para a aplicação. QtQuick é usado para interfaces de usuário, QtQuick.Controls para controles padrão (como botões e menus), QtQuick.Layouts para layouts, QtWebEngine para exibir páginas web, e Qt.labs.platform para acessar funcionalidades específicas da plataforma.
---
```
ApplicationWindow {
id: window
visible: true
width: 1024
height: 768
title: "Google"
```
`ApplicationWindow` define a janela principal da aplicação, com uma largura de 1024 pixels, altura de 768 pixels, e o título "Google".
---
```
WebEngineView {
id: webEngineView
anchors.fill: parent
url: "https://www.google.com"
onUrlChanged: {
historyModel.append({url: webEngineView.url.toString()})
}
}
```
`WebEngineView` é o componente que carrega e exibe a página web. Quando o URL muda, a nova URL é adicionada ao modelo de histórico (`historyModel`).
---
```
ListModel {
id: historyModel
}
ListView {
id: historyView
width: parent.width
height: 200
model: historyModel
delegate: Text {
text: url
}
visible: false // Defina como true para visualizar o histórico
}
```
`ListModel` armazena as URLs visitadas. `ListView` exibe esse histórico, mas está inicialmente invisível (`visible: false`).
---
```
MouseArea {
anchors.fill: parent
acceptedButtons: Qt.RightButton
onPressed: {
if (mouse.button == Qt.RightButton) {
contextMenu.open(mouse.x, mouse.y)
}
}
}
```
`MouseArea` detecta cliques do mouse. Se o botão direito do mouse for pressionado, o menu de contexto (`contextMenu`) é aberto na posição do clique.
---
```
Menu {
id: contextMenu
MenuItem {
text: qsTr("Copy")
onTriggered: webEngineView.triggerWebAction(WebEngineView.Copy)
}
MenuItem {
text: qsTr("Paste")
onTriggered: webEngineView.triggerWebAction(WebEngineView.Paste)
}
MenuItem {
text: qsTr("Cut")
onTriggered: webEngineView.triggerWebAction(WebEngineView.Cut)
}
MenuItem {
text: qsTr("Select All")
onTriggered: webEngineView.triggerWebAction(WebEngineView.SelectAll)
}
MenuItem {
text: qsTr("Refresh")
onTriggered: webEngineView.triggerWebAction(WebEngineView.Reload)
}
MenuItem {
text: qsTr("Zoom In")
onTriggered: { webEngineView.zoomFactor += 0.1; }
}
MenuItem {
text: qsTr("Zoom Out")
onTriggered: { webEngineView.zoomFactor -= 0.1; }
}
MenuItem {
text: qsTr("Open in external browser")
onTriggered: {
Qt.openUrlExternally(webEngineView.url)
}
}
}
```
`Menu` define um menu de contexto com várias opções, como copiar, colar, cortar, selecionar tudo, atualizar, zoom in, zoom out, e abrir o URL em um navegador externo.
---
```
SystemTrayIcon {
id: trayIcon
visible: true
icon.source: "./imagens/google.png" // No caso a pasta onde está a imagem do ícone
menu: Menu {
MenuItem {
text: "Open"
onTriggered: {
window.show()
window.raise()
window.requestActivate()
}
}
MenuItem {
text: "Open Specific URL"
onTriggered: {
webEngineView.url = "http://www.google.com"
window.show()
window.raise()
window.requestActivate()
}
}
MenuItem {
text: "Toggle History View"
onTriggered: {
historyView.visible = !historyView.visible
}
}
MenuItem {
text: "Settings"
onTriggered: {
// Implemente a lógica para abrir a janela de configurações
}
}
MenuItem {
text: "Exit"
onTriggered: Qt.quit()
}
}
onActivated: reason => {
if (reason === SystemTrayIcon.Trigger) {
if (window.visible) {
window.hide()
} else {
window.show()
window.raise()
window.requestActivate()
}
}
}
}
```
`SystemTrayIcon` cria um ícone na bandeja do sistema com um menu. As opções do menu permitem abrir a aplicação, abrir um URL específico, alternar a visualização do histórico, abrir configurações e sair da aplicação. A aplicação pode ser minimizada para a bandeja do sistema e restaurada a partir dela.
---
```
onClosing: {
close.accepted = false;
window.hide();
}
Component.onCompleted: {
trayIcon.show()
}
```
Esses manipuladores de evento garantem que a aplicação não seja completamente fechada ao clicar em fechar, mas sim escondida. `Component.onCompleted` exibe o ícone na bandeja quando a aplicação é iniciada.
---
### Conclusão
O código exemplifica uma aplicação QML que utiliza `WebEngineView` para carregar o Google, inclui um menu de contexto para várias operações, e um ícone de bandeja do sistema para facilitar o acesso e controle da aplicação. Os elementos chave como `MouseArea` e `SystemTrayIcon` melhoram a usabilidade, permitindo que os usuários interajam com a aplicação de maneira intuitiva e eficiente. Este exemplo é uma boa base para criar aplicativos web integrados com funcionalidades de interface de usuário ricas e interativas.
| moprius |
1,901,885 | ACCELERATING DEVOPS TESTING: Advanced Parallel Testing Techniques with Python | Parallel Testing: Parallel Testing in DevOps is a technique where different tests are executed at... | 0 | 2024-06-26T21:58:51 | https://dev.to/davidbosah/accelerating-devops-testing-advanced-parallel-testing-techniques-with-python-6ka | webdev, devops, python, beginners |
**Parallel Testing:**
Parallel Testing in DevOps is a technique where different tests are executed at the same time thereby improving efficiency. Parallel testing in DevOps with Python involves using frameworks and libraries from python to execute different tests at the same time.
_Frame works/Tools used in DevOps parallel testing with Python:_
_1. Nose testing Framework._
_2. Locust loading tool._
_3. Pytest testing framework._
_4. Behave testing framework._
**Implementation of Parallel Testing In DevOps with Python.**
The steps involved In DevOps parallel testing with Python are:
1. Install the required framework / Library. Some popular python libraries Include locust, Behave-Parallel and nose-parallel.
2. Write test case with the library/framework you choose.
3. Specify the number of parallel processes.
4. Run the tests in parallel.
5. Observe and carefully analyze results to make sure tests are passing and to confirm improved performance.
| davidbosah |
1,901,886 | Day 979 : Run | liner notes: Professional : Not a bad day. Had a couple of meetings. Responded to some community... | 0 | 2024-06-26T21:57:47 | https://dev.to/dwane/day-979-run-3el4 | hiphop, code, coding, lifelongdev | _liner notes_:
- Professional : Not a bad day. Had a couple of meetings. Responded to some community questions. I even finished a draft of the blog post I've been writing for a new feature and sent it to some folks for a technical review to make sure what I wrote is technically correct.
- Personal : Last night, I went through tracks for the radio show. Also did some research for a side project. Went through my budgeting app and cleaned up some things. I think that was it. I really don't remember. haha Really need to write this stuff down. It's not like I didn't make a Web app https://whatyoudo.in/ to keep track. haha.
Again, the AI used to generate the image caption was pretty scattered and I had to put it together to make sense. Still quicker than me coming up with it myself though. Going to go through more tracks for the radio show. Work on my side project and try to finalize the logo for a project. Looking to watch a couple of "Demon Slayer" episodes. Got to run because it is about to storm!
Have a great night!
peace piece
Dwane / conshus
https://dwane.io / https://HIPHOPandCODE.com
{% youtube eMSY3zfLxRA %} | dwane |
1,901,884 | The Magic of Guitar: A Journey Through Strings and Melodies | Introduction The guitar is more than just a musical instrument; it is a universal language that... | 0 | 2024-06-26T21:51:24 | https://dev.to/ronny_odhiambo_dfd50cf0ee/the-magic-of-guitar-a-journey-through-strings-and-melodies-g59 | **Introduction**
The guitar is more than just a musical instrument; it is a universal language that transcends cultures, genres, and generations. From the soulful strums of blues to the electrifying riffs of rock, the guitar has woven its way into the fabric of music history. Whether you're a seasoned musician or a novice, the guitar offers a unique blend of simplicity and complexity that invites everyone to explore its rich, melodic landscape.
**The Evolution of the Guitar**
Early Beginnings
The history of the guitar can be traced back to ancient civilizations. Early stringed instruments, such as the lute and the oud, were precursors to the modern guitar. These instruments, with their distinctive sounds and playing techniques, laid the foundation for the development of the guitar as we know it today.
**
The Classical Guitar**
The classical guitar, with its nylon strings and elegant design, emerged in the 19th century. Renowned composers like Francisco Tárrega and Andrés Segovia elevated the classical guitar to new heights, showcasing its versatility and expressive potential. The classical guitar's warm, mellow tones have made it a staple in both solo and ensemble settings.
**The Acoustic Guitar**
The acoustic guitar, characterized by its steel strings and hollow body, became popular in the early 20th century. Its bright, resonant sound made it a favorite among folk, country, and blues musicians. Iconic artists like Bob Dylan, Joni Mitchell, and Johnny Cash used the acoustic guitar to tell stories and convey emotions, cementing its place in the pantheon of [musical instruments.](https://railanewtone4.wixsite.com/digital-products/post/thegearpage)
**The Electric Guitar**
The invention of the electric guitar in the 1930s revolutionized the music world. With its amplified sound and ability to produce a wide range of tones, the electric guitar became the backbone of rock and roll, jazz, and later, heavy metal. Legendary guitarists like Jimi Hendrix, Eric Clapton, and Eddie Van Halen pushed the boundaries of what the electric guitar could achieve, inspiring generations of musicians.
**Playing the Guitar: Techniques and Styles**
Basic Techniques
Learning to play the guitar involves mastering a few fundamental techniques:
Chords: Chords are the building blocks of guitar music. Open chords, bar chords, and power chords are essential for playing a wide variety of songs.
Strumming and Picking: Strumming provides rhythm, while picking allows for intricate melodies and solos. Both techniques are crucial for a well-rounded playing style.
Fingerstyle: This technique involves plucking the strings with the fingers rather than a pick, allowing for greater control and complexity in playing.
Musical Styles
The guitar is incredibly versatile and is used in many musical styles:
Blues: Characterized by its use of the pentatonic scale and expressive bends, blues guitar conveys deep emotion and storytelling.
Rock: With its powerful riffs and solos, rock guitar is all about energy and attitude.
Jazz: Jazz guitarists use complex chords and improvisation to create intricate, sophisticated music.
Classical: Classical guitar focuses on precise technique and rich, melodic compositions.
Flamenco: Originating from Spain, flamenco guitar is known for its fast fingerpicking and percussive strumming.
The Impact of the Guitar on Popular Culture
The guitar has left an indelible mark on popular culture. It has become a symbol of rebellion, freedom, and creativity. From the Beatles' groundbreaking performances to the electrifying shows of Led Zeppelin, the guitar has been at the heart of some of the most iconic moments in music history.
Guitar heroes have inspired countless individuals to pick up the instrument and start their own musical journeys. Festivals like Woodstock and Monterey Pop Festival showcased the power of the guitar to bring people together and create unforgettable experiences.
**Conclusion**
The guitar's enduring appeal lies in its ability to connect with people on a profound level. Whether you're strumming chords around a campfire or performing on a grand stage, the guitar offers a unique way to express yourself and connect with others. Its rich history, diverse styles, and cultural significance make it a truly magical instrument.
So, pick up a guitar and let your fingers dance across the strings. Explore the endless possibilities and discover the joy of creating music with one of the most beloved instruments in the world.
| ronny_odhiambo_dfd50cf0ee | |
1,901,882 | Pure CSS Pixar lamp | Check out this Pen I made! | 0 | 2024-06-26T21:44:53 | https://dev.to/mhjwbymhmd/pure-css-pixar-lamp-5a07 | codepen | Check out this Pen I made!
{% codepen https://codepen.io/amit_sheen/pen/WNBdRqm %} | mhjwbymhmd |
1,901,881 | Pure CSS Pixar lamp | Check out this Pen I made! | 0 | 2024-06-26T21:44:49 | https://dev.to/mhjwbymhmd/pure-css-pixar-lamp-198b | codepen | Check out this Pen I made!
{% codepen https://codepen.io/amit_sheen/pen/WNBdRqm %} | mhjwbymhmd |
1,901,879 | Understanding Array Data Structures | In computer science, an array is a data structure consisting of a collection of elements (values or... | 0 | 2024-06-26T21:40:19 | https://dev.to/m__mdy__m/understanding-array-data-structures-8do | javascript, programming, beginners, tutorial | In computer science, an array is a data structure consisting of a collection of elements (values or variables) of the same memory size, each identified by at least one array index or key. An array is stored such that the position of each element can be computed from its index tuple by a mathematical formula. The simplest type of data structure is a linear array, also called a one-dimensional array.
For example, an array of ten 32-bit (4-byte) integer variables, with indices 0 through 9, may be stored as ten words at memory addresses 2000, 2004, 2008, ..., 2036, (in hexadecimal: `0x7D0`, `0x7D4`, `0x7D8`, ..., `0x7F4`) so that the element with index i has the address 2000 + (i × 4). The memory address of the first element of an array is called the first address, foundation address, or base address.
Because the mathematical concept of a matrix can be represented as a two-dimensional grid, two-dimensional arrays are also sometimes called "matrices." In some cases, the term "vector" is used in computing to refer to an array, although tuples rather than vectors are the more mathematically correct equivalent. Tables are often implemented in the form of arrays, especially lookup tables; the word "table" is sometimes used as a synonym of array.
Arrays are among the oldest and most important data structures and are used by almost every program. They are also used to implement many other data structures, such as lists and strings. They effectively exploit the addressing logic of computers. In most modern computers and many external storage devices, the memory is a one-dimensional array of words, whose indices are their addresses. Processors, especially vector processors, are often optimized for array operations.
Arrays are useful mostly because the element indices can be computed at runtime. Among other things, this feature allows a single iterative statement to process arbitrarily many elements of an array. For that reason, the elements of an array data structure are required to have the same size and should use the same data representation. The set of valid index tuples and the addresses of the elements (and hence the element addressing formula) are usually, but not always, fixed while the array is in use.
The term "array" may also refer to an array data type, a kind of data type provided by most high-level programming languages that consists of a collection of values or variables that can be selected by one or more indices computed at runtime. Array types are often implemented by array structures; however, in some languages, they may be implemented by hash tables, linked lists, search trees, or other data structures.
The term is also used, especially in the description of algorithms, to mean associative array or "abstract array," a theoretical computer science model (an abstract data type or ADT) intended to capture the essential properties of arrays.
[What is abstract array](https://github.com/m-mdy-m/algorithms-data-structures/blob/main/10.Data_Structures/Array/Abstract_Arrays_Associative_Arrays.md)
### Real-World Example
Consider a simple example of a bookshelf in a library. Each shelf can be seen as an array where each slot (index) on the shelf holds one book (element). If we have a shelf with 10 slots, we can label these slots from 0 to 9. If we want to find the 4th book on the shelf, we look at the slot with index 3 (since indexing typically starts at 0). This straightforward system allows us to quickly locate any book by its slot number, similar to how we would access an element in an array using its index.
### Key Points for Better Understanding
- **Indexing**: Array elements are accessed using indices, which are typically integers. The indices can start at 0 (zero-based indexing), 1 (one-based indexing), or any other integer, depending on the language and context.
- **Memory Efficiency**: Arrays are stored in contiguous memory locations, which allows for efficient indexing and iteration through the elements.
- **Fixed Size**: Traditional arrays have a fixed size, meaning that once the array is created, its size cannot be changed. However, dynamic arrays or lists in some programming languages allow resizing.
- **Homogeneous Elements**: All elements in an array are of the same data type, which ensures that each element occupies the same amount of memory.
### Practical Example
In a programming context, consider a one-dimensional array in C that stores the scores of 5 students:
```c
#include <stdio.h>
int main() {
// Declare an array of 5 integers
int scores[5] = {85, 90, 78, 92, 88};
// Access and print each element using its index
for(int i = 0; i < 5; i++) {
printf("Student %d: %d\n", i + 1, scores[i]);
}
return 0;
}
```
In this example, `scores[0]` refers to the first student's score (85), `scores[1]` to the second student's score (90), and so on. This illustrates how an array allows for efficient storage and retrieval of multiple elements using indices.
## History
The evolution of arrays as a fundamental data structure has played a significant role in the development of computer science.
#### Early Digital Computers
The first digital computers employed machine-language programming to create and access array structures for various purposes, including data tables, vector and matrix computations. John von Neumann made a significant contribution in 1945 by writing the first array-sorting program, known as merge sort, during the development of the first stored-program computer.
#### Array Indexing
Initially, array indexing was managed through self-modifying code. This method was later improved with the introduction of index registers and indirect addressing. Some mainframes designed in the 1960s, like the Burroughs B5000 and its successors, incorporated memory segmentation to perform index-bounds checking directly in hardware.
#### Support in Programming Languages
Assembly languages typically do not have special support for arrays beyond what is provided by the machine's hardware. However, early high-level programming languages began to include more advanced support for arrays:
- **FORTRAN (1957)**: One of the earliest high-level languages, FORTRAN introduced support for multi-dimensional arrays.
- **Lisp (1958)**: Known for its flexibility, Lisp also included array support.
- **COBOL (1960)**: Designed for business applications, COBOL included multi-dimensional array capabilities.
- **ALGOL 60 (1960)**: A language influential in the development of many later languages, ALGOL 60 supported multi-dimensional arrays.
- **C (1972)**: The C programming language provided robust support for arrays, allowing for flexible data management and manipulation.
#### Advances in C++
With the advent of C++ in 1983, more sophisticated features were introduced. C++ included class templates for multi-dimensional arrays with dimensions fixed at runtime, as well as support for runtime-flexible arrays, enhancing the versatility and efficiency of array handling in software development.
## Applications
Arrays are a versatile and fundamental data structure in computer science, used across a wide range of applications.
#### Mathematical and Database Applications
Arrays are commonly used to implement mathematical constructs such as vectors and matrices, as well as various types of rectangular tables. Many databases, both large and small, often include or consist entirely of one-dimensional arrays whose elements are records.
#### Implementing Other Data Structures
Arrays serve as the foundation for implementing other data structures, including:
- **Lists**: Arrays can store list elements in a contiguous block of memory.
- **Heaps**: Binary heaps are efficiently implemented using arrays.
- **Hash Tables**: Arrays are used to store the entries in a hash table.
- **Deques, Queues, and Stacks**: These linear data structures can be implemented using arrays for efficient element access and modification.
- **Strings**: Character arrays are a fundamental way to represent strings.
- **VLists**: Arrays can also be used to implement VLists, a variant of linked lists.
Array-based implementations of these data structures are often simple and space-efficient (implicit data structures), requiring minimal space overhead. However, they can have poor space complexity, particularly when modified frequently, compared to tree-based data structures (e.g., a sorted array versus a search tree).
#### Memory Allocation
Arrays can be utilized to emulate dynamic memory allocation within a program, especially in the form of memory pool allocation. Historically, this approach was sometimes the only portable way to allocate dynamic memory.
#### Control Flow Management
Arrays can also influence control flow in programs, serving as a compact alternative to multiple repetitive `IF` statements. In this context, they are referred to as control tables. These tables are used with purpose-built interpreters that alter control flow based on values within the array. The array may contain pointers to subroutines (or relative subroutine numbers) that can be acted upon by `SWITCH` statements, thus directing the execution path efficiently.
## Element Identifier and Addressing Formulas
When data objects are stored in an array, individual objects are selected by an index, usually a non-negative scalar integer. Indexes, also called subscripts, map the array value to a stored object.
### Indexing Methods
There are three primary ways in which the elements of an array can be indexed:
1. **Zero-Based Indexing**
- The first element of the array is indexed by a subscript of 0.
2. **One-Based Indexing**
- The first element of the array is indexed by a subscript of 1.
3. **n-Based Indexing**
- The base index of an array can be freely chosen. In programming languages that support n-based indexing, negative index values and other scalar data types, such as enumerations or characters, may be used as an array index.
### Design Choices and Examples
Zero-based indexing is the design choice of many influential programming languages, including C, Java, and Lisp. This choice leads to a simpler implementation, where the subscript refers to an offset from the starting position of an array, so the first element has an offset of zero.
Arrays can have multiple dimensions, requiring multiple indices to access elements. For example, in a two-dimensional array `A` with three rows and four columns, the element at the 2nd row and 4th column might be accessed using the expression `A[1][3]` in a zero-based indexing system. Thus, two indices are used for a two-dimensional array, three for a three-dimensional array, and n for an n-dimensional array.
The number of indices needed to specify an element is called the dimension, dimensionality, or rank of the array.
### Address Calculation
In standard arrays, each index is restricted to a certain range of consecutive integers (or consecutive values of some enumerated type). The address of an element is computed using a linear formula on the indices.
For example, consider a one-dimensional array of ten 32-bit (4-byte) integer variables, with indices 0 through 9, stored at memory addresses 2000, 2004, 2008, ..., 2036 (in hexadecimal: `0x7D0`, `0x7D4`, `0x7D8`, ..., `0x7F4`). The element with index `i` has the address `2000 + (i × 4)`. The memory address of the first element is called the first address, foundation address, or base address.
### Practical Application Example
To better understand this concept, imagine a bookshelf where each book is assigned a number starting from 0. The first book is book 0, the second is book 1, and so on. If the base position of the shelf is marked as 2000, the address of the book can be calculated using its position number multiplied by the book's width (let’s say 4 cm). Therefore, the address of the 3rd book (position 2) would be `2000 + (2 × 4) = 2008`.
This method simplifies the process of locating a book (or an array element) by providing a straightforward calculation based on its position index.
### One-dimensional Arrays
A one-dimensional array, also known as a single dimension array, is a fundamental type of linear array. It involves accessing elements using a single subscript, which can represent either a row or column index.
#### Example and Declaration
Consider the C declaration `int anArrayName[10];`, which declares a one-dimensional array capable of storing ten integers. This array spans indices from zero to nine. For instance, `anArrayName[0]` and `anArrayName[9]` refer to the first and last elements, respectively.
#### Addressing Scheme
In a one-dimensional array with linear addressing, the element at index *i* is located at address **B + c · i**, where *B* is a fixed base address and *c* is a constant referred to as the address increment or stride.
- **Base Address (B):** If the array begins indexing at 0, *B* is simply the address of the first element. This convention aligns with the C programming language's specification, where array indices start from 0.
- **Customizing Base Address (B):** Alternatively, one can choose a different index for the first element by adjusting the base address *B*. For example, if an array of five elements is indexed from 1 to 5, setting *B* to **B + 30c** shifts the indices to 31 through 35. When the index does not commence at 0, *B* may not correspond to the address of any element directly.
Understanding one-dimensional arrays involves grasping the concept of linear indexing and the relationship between indices and memory addresses. This foundational knowledge is essential in programming for efficient data storage and retrieval using arrays.
### Multidimensional Arrays
Multidimensional arrays extend the concept of a one-dimensional array to multiple dimensions, allowing for more complex data structures such as matrices and higher-dimensional data sets.
#### Address Calculation
For a two-dimensional array, the address of an element with indices \(i\) and \(j\) is calculated using the formula:
\[ \text{Address} = B + c \cdot i + d \cdot j \]
Here, \(B\) is the base address, and \(c\) and \(d\) are the row and column address increments, respectively.
For a more general \(k\)-dimensional array, the address of an element with indices \(i_1, i_2, \ldots, i_k\) is given by:
\[ \text{Address} = B + c_1 \cdot i_1 + c_2 \cdot i_2 + \ldots + c_k \cdot i_k \]
where \(c_1, c_2, \ldots, c_k\) are the address increments for each dimension.
#### Example
Consider the declaration in C:
```c
int a[2][3];
```
This declares a two-dimensional array `a` with 2 rows and 3 columns, capable of storing 6 integer elements. The elements are stored linearly in memory, starting from the first row, then continuing with the second row. The storage layout would be:
\[ \text{a}_{11}, \text{a}_{12}, \text{a}_{13}, \text{a}_{21}, \text{a}_{22}, \text{a}_{23} \]
#### General Formula
The general address calculation formula for a \(k\)-dimensional array requires \(k\) multiplications and \(k\) additions, making it efficient for arrays that fit in memory. If any coefficient \(c_k\) is a fixed power of 2, the multiplication can be optimized by replacing it with bit shifting.
The coefficients \(c_k\) must be chosen so that every valid index tuple maps to the address of a distinct element. If the minimum legal value for each index is 0, then \(B\) is the address of the element whose indices are all zero. Changing the base address \(B\) can shift the index range.
#### Index Range Customization
For example, in a two-dimensional array with rows indexed from 1 to 10 and columns from 1 to 20, replacing \(B\) by \(B - c_1 + 3c_2\) would renumber the indices to 0 through 9 and 4 through 23, respectively. This flexibility allows for various indexing schemes across different programming languages.
- **FORTRAN 77:** Specifies that array indices begin at 1, adhering to mathematical tradition.
- **Fortran 90, Pascal, Algol:** Allow users to choose the minimum value for each index.
#### Use Cases and Advantages
Multidimensional arrays are extensively used in scientific computing, engineering, image processing, and any domain where grid-based data structures are necessary. They allow for efficient storage and access patterns in programs that handle large volumes of data.
For instance, in image processing, a two-dimensional array can represent pixel values, with rows and columns corresponding to pixel coordinates. In scientific simulations, three-dimensional arrays can represent physical quantities in a spatial grid.
#### Key Points
- **Efficiency:** Multidimensional arrays are efficient in terms of both time and space, particularly when the address calculation can be optimized with bit shifting.
- **Flexibility:** They provide flexible indexing schemes, allowing customization of the starting index and dimension sizes.
- **Application:** They are crucial in fields requiring structured data storage, such as scientific computing, data analysis, and engineering simulations.
### Dope Vectors
The addressing formula for array elements is fully defined by the dimension \(d\), the base address \(B\), and the increments \(c_1, c_2, \ldots, c_k\). These parameters can be packed into a record known as the array's descriptor, stride vector, or dope vector. This record may also include the size of each element and the minimum and maximum values allowed for each index.
The dope vector serves as a complete handle for the array, making it a convenient way to pass arrays as arguments to procedures. By including all necessary information about the array's structure, the dope vector allows for efficient manipulation and access to the array's elements.
#### Efficient Array Operations
Many useful array slicing operations can be performed very efficiently by manipulating the dope vector. These operations include:
- **Selecting a Sub-array:** Extracting a portion of the array without copying the elements.
- **Swapping Indices:** Changing the order of indices to transpose the array or reorder dimensions.
- **Reversing Indices:** Reversing the order of elements along one or more dimensions.
#### Example of Dope Vector Usage
Consider a two-dimensional array where you want to extract a sub-array or reverse the order of elements in a specific dimension. By adjusting the increments and base address in the dope vector, these operations can be performed without the need to move the actual data in memory. This leads to significant performance gains, especially for large arrays.
#### Benefits of Dope Vectors
- **Efficiency:** Operations that would typically require copying or rearranging data can be done by simply updating the dope vector.
- **Flexibility:** The dope vector encapsulates all the information needed to handle the array, making it easy to pass arrays between functions and modules.
- **Convenience:** Provides a unified approach to managing arrays, simplifying code and reducing the likelihood of errors.
#### Real-World Example: Image Processing
Consider an image represented as a two-dimensional array where each element corresponds to a pixel's color value. Let's say the image is stored in an array `image[height][width]`.
1. **Base Address (B):** The memory address of the first pixel.
2. **Increments (c1, c2):** The increments for row and column access. If each pixel is stored consecutively, the increment for the column (c1) is 1, and for the row (c2) it is the width of the image.
If we pack these parameters into a dope vector, it might look like this:
```c
typedef struct {
int* base_address; // Pointer to the first element
int row_increment; // Increment for row (width of the image)
int col_increment; // Increment for column (typically 1)
int element_size; // Size of each element in bytes
int min_row, max_row; // Min and max index for rows
int min_col, max_col; // Min and max index for columns
} DopeVector;
DopeVector dv = {
.base_address = &image[0][0],
.row_increment = width,
.col_increment = 1,
.element_size = sizeof(int),
.min_row = 0,
.max_row = height - 1,
.min_col = 0,
.max_col = width - 1
};
```
#### Efficient Operations Using Dope Vector
With the dope vector, we can perform efficient array operations:
- **Sub-array Selection:** Select a specific region of the image.
- **Index Swapping:** Change the order of accessing elements, such as transposing the image.
- **Reversing Indices:** Flip the image horizontally or vertically.
For instance, to select a sub-array (e.g., a 100x100 pixel region starting at row 50, column 50), we can adjust the base address and the index range in the dope vector:
```c
DopeVector sub_image = dv;
sub_image.base_address = &image[50][50];
sub_image.min_row = 50;
sub_image.max_row = 149;
sub_image.min_col = 50;
sub_image.max_col = 149;
```
#### Practical Application: Image Processing Library
In an image processing library, functions can use dope vectors to handle various image transformations efficiently. For example, a function to flip an image horizontally might adjust the column increment:
```c
void flip_image_horizontally(DopeVector* dv) {
dv->col_increment = -dv->col_increment;
dv->base_address = &dv->base_address[dv->max_col];
}
```
By manipulating the dope vector, the function achieves the desired transformation without needing to modify the original array directly, ensuring efficient and flexible operations.
In conclusion, dope vectors provide a powerful abstraction for handling arrays, allowing for efficient manipulation and passing of arrays in programs. They are particularly useful in applications requiring complex array operations, such as image processing, scientific computing, and data analysis.
### Compact Layouts
Often the coefficients are chosen so that the elements occupy a contiguous area of memory. However, that is not necessary. Even if arrays are always created with contiguous elements, some array slicing operations may create non-contiguous sub-arrays from them.
There are two systematic compact layouts for a two-dimensional array. For example, consider the matrix:
\[
\begin{matrix}
1 & 2 & 3 \\
4 & 5 & 6 \\
7 & 8 & 9
\end{matrix}
\]
In the row-major order layout (adopted by C for statically declared arrays), the elements in each row are stored in consecutive positions, and all of the elements of a row have a lower address than any of the elements of a consecutive row:
`1 2 3 4 5 6 7 8 9`
In column-major order (traditionally used by Fortran), the elements in each column are consecutive in memory, and all of the elements of a column have a lower address than any of the elements of a consecutive column:
`1 4 7 2 5 8 3 6 9`
For arrays with three or more indices, "row-major order" puts in consecutive positions any two elements whose index tuples differ only by one in the last index. "Column-major order" is analogous with respect to the first index.
In systems that use processor cache or virtual memory, scanning an array is much faster if successive elements are stored in consecutive positions in memory, rather than sparsely scattered. This is known as spatial locality, which is a type of locality of reference. Many algorithms that use multidimensional arrays will scan them in a predictable order. A programmer (or a sophisticated compiler) may use this information to choose between row- or column-major layout for each array. For example, when computing the product \(A \cdot B\) of two matrices, it would be best to have \(A\) stored in row-major order and \(B\) in column-major order.
#### Real-World Example: Matrix Multiplication
Consider the multiplication of two matrices \(A\) and \(B\). Suppose \(A\) is stored in row-major order and \(B\) in column-major order. When computing \(A \cdot B\), the access pattern benefits from these layouts:
- **Row-Major (A)**: Elements are accessed row-wise, which aligns with typical matrix multiplication algorithms that traverse rows of \(A\) and columns of \(B\).
- **Column-Major (B)**: Allows efficient access to columns of \(B\) during the multiplication process.
```c
// Example of matrix multiplication using row-major and column-major layouts
#define N 3
void matrix_multiply(int A[N][N], int B[N][N], int C[N][N]) {
for (int i = 0; i < N; ++i) {
for (int j = 0; j < N; ++j) {
C[i][j] = 0;
for (int k = 0; k < N; ++k) {
C[i][j] += A[i][k] * B[k][j];
}
}
}
}
```
In this example, the efficiency of accessing elements aligns with the layout of matrices \(A\) and \(B\), optimizing memory access patterns and potentially improving performance due to better cache utilization and spatial locality.
### Optimization Considerations
When designing and implementing algorithms that involve multidimensional arrays, optimizing the array layout can significantly impact performance and memory efficiency. Here are key considerations:
#### Spatial Locality
Arrays benefit from **spatial locality** when elements are stored contiguously in memory. This allows for faster access times due to caching mechanisms and efficient memory page handling. For instance, in matrix operations like multiplication or traversal algorithms, accessing adjacent elements in memory reduces cache misses and improves overall performance.
#### Algorithmic Choices
Programmers and compilers can make strategic **algorithmic choices** to optimize array layouts based on anticipated access patterns and computational requirements:
- **Matrix Multiplication**: Consider the multiplication of matrices \(A\) and \(B\). If \(A\) is stored in row-major order and \(B\) in column-major order, accessing rows of \(A\) and columns of \(B\) aligns with typical matrix multiplication algorithms, optimizing performance.
```c
#define N 3
void matrix_multiply(int A[N][N], int B[N][N], int C[N][N]) {
for (int i = 0; i < N; ++i) {
for (int j = 0; j < N; ++j) {
C[i][j] = 0;
for (int k = 0; k < N; ++k) {
C[i][j] += A[i][k] * B[k][j];
}
}
}
}
```
In this example, the layout of \(A\) and \(B\) in memory optimizes the traversal of rows and columns during multiplication, leveraging spatial locality for improved performance.
#### Real-World Example: Image Processing
In image processing, convolution operations on multidimensional arrays (such as image matrices) can benefit from optimized array layouts. By arranging pixels in memory to align with the convolution kernel's access pattern, algorithms can efficiently apply filters and transformations.
```python
import numpy as np
# Example of applying a 3x3 filter to an image using numpy
def apply_filter(image, filter_kernel):
height, width = image.shape
result = np.zeros_like(image)
for i in range(1, height - 1):
for j in range(1, width - 1):
result[i, j] = np.sum(image[i-1:i+2, j-1:j+2] * filter_kernel)
return result
# Example usage
image = np.random.randint(0, 256, size=(1000, 1000))
filter_kernel = np.array([[1, 1, 1],
[1, -8, 1],
[1, 1, 1]])
filtered_image = apply_filter(image, filter_kernel)
```
Efficiently accessing adjacent pixels based on the chosen array layout enhances the performance of image filtering operations by minimizing memory access delays.
### Resizing
Static arrays have a fixed size upon creation, which limits their flexibility in accommodating variable numbers of elements. However, dynamic resizing techniques can effectively simulate dynamic array behavior by reallocating memory and copying elements. This concept is essential in data structures like dynamic arrays.
#### Dynamic Arrays
Dynamic arrays are resizable, allowing elements to be added or removed dynamically. When the array reaches its capacity, additional elements can be appended by reallocating memory and copying existing elements. This resizing operation, if infrequent, ensures that insertions at the end of the array remain efficient with amortized constant time complexity.
#### Example: Dynamic Array in Python
In Python, lists are implemented as dynamic arrays. They automatically resize as elements are added beyond their initial capacity. The `append()` method allows elements to be added efficiently, resizing the underlying array as needed.
```python
# Example of dynamic array in Python
dynamic_array = []
# Append elements to the dynamic array
dynamic_array.append(1)
dynamic_array.append(2)
dynamic_array.append(3)
print(dynamic_array) # Output: [1, 2, 3]
```
When the number of elements exceeds the current capacity of the dynamic array, Python internally reallocates memory to accommodate additional elements. This resizing ensures that operations like appending elements remain efficient, although occasional reallocation and copying may incur a slight overhead.
#### Counted Arrays
Some array data structures maintain a fixed maximum size but include a count or size attribute to track the number of elements currently in use. This approach is common in languages like Pascal, where strings are represented using counted arrays. The count helps manage the array's dynamic behavior within its predefined capacity.
#### Real-World Example: Managing Database Records
In database management systems, arrays or similar data structures are used to manage records retrieved from databases. When handling variable numbers of records, dynamic resizing mechanisms ensure efficient memory usage and fast access times. For instance, when retrieving query results that vary in size, dynamic arrays facilitate flexible storage and manipulation of fetched data.
### Non-linear Formulas
While arrays often use linear addressing formulas for simplicity and efficiency, there are scenarios where more complex, non-linear formulas are employed. These formulas are particularly useful for representing specialized data structures, such as triangular or other irregularly shaped arrays.
#### Compact Two-dimensional Triangular Array
In a compact two-dimensional triangular array, the elements are stored in a triangular fashion rather than a rectangular grid. This arrangement reduces the space needed to store symmetric or triangular matrices. The addressing formula for such an array is typically a polynomial of degree 2.
For example, consider a lower triangular matrix where only the elements on and below the main diagonal are stored. The element at position \((i, j)\) in the original matrix can be mapped to a one-dimensional array using the formula:
\[ \text{index} = \frac{i \cdot (i + 1)}{2} + j \]
where \(i \geq j\).
#### Real-World Example: Storing Distance Matrices
A practical application of non-linear formulas is in storing distance matrices in computational chemistry or graph theory. In these fields, the distance between nodes (or atoms) is often symmetric, meaning the distance from node A to node B is the same as from node B to node A. To save space, only the lower or upper triangular part of the matrix is stored.
For instance, in a system with four nodes, the distance matrix might be:
\[
\begin{matrix}
0 & 2 & 3 & 4 \\
2 & 0 & 5 & 6 \\
3 & 5 & 0 & 7 \\
4 & 6 & 7 & 0 \\
\end{matrix}
\]
Using the triangular storage, only the elements on and below the diagonal are stored:
\[
\begin{matrix}
0 \\
2 & 0 \\
3 & 5 & 0 \\
4 & 6 & 7 & 0 \\
\end{matrix}
\]
The non-linear indexing formula ensures efficient access and storage of these elements, reducing memory usage.
#### Optimizing Storage and Access
Using non-linear formulas for specialized data structures can significantly optimize storage and access patterns. This is particularly important in applications with large datasets or where memory efficiency is critical, such as scientific simulations, network analysis, and large-scale data processing.
By employing non-linear addressing formulas, developers can tailor data storage to the specific needs of their applications, enhancing both performance and resource utilization.
### Efficiency
Arrays offer significant efficiency benefits for both storage and access. Storing and selecting elements in an array can be done in constant time (\(O(1)\)), making arrays one of the most time-efficient data structures for accessing elements by index. Arrays require linear space (\(\Theta(n)\)) relative to the number of elements \(n\) they contain, which makes them space-efficient as well.
#### Cache Performance
In an array with an element size \(k\) and a machine cache line size of \(B\) bytes, iterating through an array of \(n\) elements incurs approximately \(\lceil nk / B \rceil\) cache misses, as the elements are stored contiguously in memory. This can be much more efficient than accessing \(n\) elements at random memory locations, which would result in many more cache misses. This spatial locality means that sequential access to array elements is typically much faster than accessing elements in many other data structures.
For example, a program processing a large dataset stored in an array will experience fewer cache misses and thus run faster than if the data were stored in a linked list or another non-contiguous structure. This efficiency is exploited in numerous applications, such as image processing, where pixel data is often stored in arrays and processed sequentially.
#### Memory Copy Optimization
Many libraries provide optimized functions for copying blocks of memory, such as `memcpy` in C. These functions can move contiguous blocks of array elements significantly faster than copying individual elements one by one. The speed of such operations depends on the element size, the architecture, and the implementation.
#### Compact Storage
Arrays are compact data structures with minimal overhead. While there may be a small per-array overhead (e.g., for storing index bounds), this overhead is generally low. Packed arrays, where multiple elements are stored in a single word, can further optimize memory usage. For instance, bit arrays store each element as a single bit, allowing for extremely dense storage.
Real-world example: A bitmap image can be efficiently stored as a bit array, where each bit represents a pixel's presence or absence, allowing for very compact storage.
#### Data Parallelism
Array accesses with predictable access patterns are ideal for data parallelism. Many modern processors and compilers can exploit this characteristic to parallelize operations, enhancing performance in computationally intensive applications.
#### Comparison with Other Data Structures
Here's a comparison of arrays with other common data structures:
| Data Structure | Peek (index) | Mutate (insert or delete) at ... | Excess space, average |
|------------------------|--------------|----------------------------------|-----------------------|
| Linked list | O(n) | O(1) | O(n) |
| Array | O(1) | — | 0 |
| Dynamic array | O(1) | O(n) | O(n) |
| Balanced tree | O(log n) | O(log n) | O(n) |
| Random-access list | O(log n) | O(1) | O(n) |
| Hashed array tree | O(1) | O(n) | O(sqrt{n}) |
#### Real-World Example: Database Systems
In database systems, arrays are often used to store and access records efficiently. Consider a database index implemented as an array. Accessing a record by its index can be done in constant time, ensuring fast query performance. Additionally, sequential scans over the index benefit from spatial locality, making the operation cache-efficient.
Dynamic arrays, which allow for resizing, provide the flexibility needed in applications where the number of elements can change, such as dynamic datasets or real-time data processing.
Associative arrays, like hash tables, are used in databases to handle sparse data efficiently, such as indexing documents in a search engine where only certain terms appear in specific documents.
Balanced trees, like B-trees, are used in databases for maintaining sorted data and allowing fast search, insertion, and deletion operations, which is critical for maintaining database indexes.
### Iliffe Vectors
An Iliffe vector is an alternative to the traditional multidimensional array structure. It consists of a one-dimensional array of references (or pointers) to arrays of one dimension less. For example, a two-dimensional Iliffe vector would be a vector of pointers to vectors, with each pointer corresponding to a row in the matrix. An element in row \(i\) and column \(j\) of an array \(A\) would be accessed using double indexing (\(A[i][j]\) in typical notation).
This structure is particularly useful for creating jagged arrays, where each row can have a different number of elements. In general, the valid range of each index can depend on the values of all preceding indices. The Iliffe vector structure can save one multiplication (by the column address increment), replacing it with a bit shift (to index the vector of row pointers) and an additional memory access (fetching the row address). This trade-off can be beneficial on some architectures.
#### Real-World Example: Spreadsheet Applications
A common real-world example of Iliffe vectors is in spreadsheet applications like Microsoft Excel or Google Sheets. These applications often deal with tables that are conceptually two-dimensional, but where different rows can have different numbers of columns (i.e., jagged arrays). Each row in a spreadsheet can be thought of as an array, and the entire spreadsheet as a vector of these row arrays.
When accessing a particular cell in the spreadsheet, the software first uses the row index to find the pointer to the correct row array, and then uses the column index to access the specific cell within that row. This structure allows for the flexible addition and removal of columns in individual rows without requiring the entire spreadsheet to be restructured.
Another real-world example is in image processing, where Iliffe vectors can be used to represent images with varying row lengths. For instance, consider a panoramic image stitched together from multiple photos, where each row of pixels may have a different width. Using Iliffe vectors allows efficient access to pixel data while accommodating the varying row sizes.
### Dimension
The dimension of an array refers to the number of indices needed to select an element within the array. In this context, if the array is viewed as a function on a set of possible index combinations, the dimension corresponds to the dimension of the space from which its domain is a discrete subset.
- A one-dimensional array is essentially a list of data.
- A two-dimensional array represents a rectangle of data.
- A three-dimensional array forms a block of data.
- Higher-dimensional arrays continue this pattern into more complex structures.
It is important not to confuse this definition with the dimension of the set of all matrices with a given domain, which refers to the number of elements in the array. For instance, an array with 5 rows and 4 columns is considered two-dimensional, but such matrices form a 20-dimensional space if we consider the number of elements. Similarly, a three-dimensional vector can be represented by a one-dimensional array of size three.
#### Real-World Example: Image Processing
A real-world example of multidimensional arrays can be found in image processing. An image is often represented as a two-dimensional array (or matrix) of pixels. Each pixel can be further represented as a one-dimensional array containing color values (e.g., RGB - Red, Green, Blue channels). Therefore, a color image can be viewed as a three-dimensional array where:
- The first two dimensions correspond to the spatial coordinates (rows and columns of the image).
- The third dimension represents the color channels.
For example, a 1920x1080 resolution image with three color channels can be represented as a 3D array of size [1920][1080][3].
When processing images, such as applying filters, detecting edges, or compressing data, these multidimensional arrays are essential. Efficient manipulation of these arrays using specialized libraries like OpenCV or NumPy allows for rapid and sophisticated image processing techniques. For example, converting an image to grayscale involves reducing the third dimension by averaging the color values, effectively transforming a 3D array into a 2D array.
## Example
- [Rust](https://github.com/m-mdy-m/algorithms-data-structures/blob/main/10.Data_Structures/Array/example/Array.rs)
- [Golang](https://github.com/m-mdy-m/algorithms-data-structures/blob/main/10.Data_Structures/Array/example/Array.go)
- [Java](https://github.com/m-mdy-m/algorithms-data-structures/blob/main/10.Data_Structures/Array/example/Array.java)
- [Javascript](https://github.com/m-mdy-m/algorithms-data-structures/blob/main/10.Data_Structures/Array/example/Array.js)
- [Typescript](https://github.com/m-mdy-m/algorithms-data-structures/blob/main/10.Data_Structures/Array/example/Array.ts)
- [Python](https://github.com/m-mdy-m/algorithms-data-structures/blob/main/10.Data_Structures/Array/example/Array.py)
## Deepen Your Algorithmic Journey: A World of Discovery Awaits
Excited to delve deeper into the world of non-linear array addressing and beyond? My GitHub repository, **[Algorithms & Data Structures](https://github.com/m-mdy-m/algorithms-data-structures)**, offers a treasure trove of algorithms and data structures for you to explore.
**Experiment, Practice, and Master:**
* **Dive into:** A diverse collection of algorithms and data structures awaits your exploration, providing ample opportunity to practice, solidify your knowledge, and refine your understanding.
* **Continuous Growth:** While some sections are actively under development as part of my ongoing learning journey (estimated completion: 2-3 years), the repository is constantly expanding with new content.
**Let's Build a Community of Learners:**
The quest for knowledge doesn't end with exploration! I actively encourage feedback and collaboration. Encountered a challenge? Have a suggestion for improvement? Eager to discuss algorithms and performance optimization? Reach out and let's connect!
* **Join the Conversation:**
* **Twitter:** [@m__mdy__m](https://twitter.com/m__mdy__m)
* **Telegram:** **Join my channel here: [https://t.me/medishn](https://t.me/medishn)** (Note: This is the preferred channel for the most up-to-date discussions)
* **GitHub:** [m-mdy-m](https://github.com/m-mdy-m)
**Together, let's build a vibrant learning community where we can share knowledge and push the boundaries of our understanding.**
| m__mdy__m |
1,901,877 | Memory management and other weird blobs | I always felt confused by the terms “Blob, Buffer, ArrayBuffer, Uint8Array.” Everyone has their own... | 0 | 2024-06-26T21:39:59 | https://dev.to/artiumws/memory-management-and-other-weird-blobs-36bj | webdev, javascript, programming, tutorial | I always felt confused by the terms “Blob, Buffer, ArrayBuffer, Uint8Array.”
Everyone has their own definition, but no one can clearly define them. It always ends up in a nonsensical technical explanation.
Today, I’ll put a human-readable definition on these terms. This will help my future self and other engineers to have a better understanding.
Let me introduce you to the strange world of memory management in JavaScript.
---
Before we dive into the subject — if you have any questions during the lecture — feel free to ask me on Twitter: [@artiumWs](https://twitter.com/ArtiumWs)
---
## Concepts
Before starting, let’s define some basic concepts: Memory, Memory Span, Binary Data, and Raw Data.
### Memory
*Memory (RAM) is fast storage used by a computer to quickly access and store data.*
### Memory span
*A memory span refers to a contiguous block of memory.*
If memory is a street, a memory span would be neighbouring houses.
### Binary data
*Binary data is the representation of information in binary form* — *bunch of 0 and 1*
### Raw Data
*Raw data is the unprocessed information consumed by a program — text, images, files …*
**Keep these definitions in mind.** They will be useful for understanding the following sections.
## In-code object
### Blob object
*A `Blob` is an immutable object referencing raw data.*
This is an object created in your code that contains raw data information like size in bytes and MIME type (`image/png`, `application/pdf`, `application/json`, …).
### File object
*A `File` extends from `Blob` properties and is created when using an input element.*
It’s a `Blob` with more information like: last modified date and file name. This object is automatically created when a file is uploaded to your app using an input element or a drag-and-drop event.
Those object cannot be modified directly! They are the in-code reference to the raw data.
This is to ensures their integrity when manipulating them.
## Manipulation
Those objects provide two methods to access the data: `arrayBuffer` and `stream`
### arrayBuffer
`arrayBuffer` is *method that load the binary data of the object in a memory span and return a in-code representation of a memory span.*
This representation cannot be modified directly! We need to reference it first with a typed array to access its binary data. Typed arrays are defined later.
**Caution:** It loads the whole file in your memory at once. In case the file size is to big (>5Mb), this operation can freeze your app. In such case, use the next method.
### stream
*`stream` is a method that load the binary data in chunks. This process is called buffering.*
Chunks returned are directly typed arrays so they can be directly manipulated to process you data on fly.
### Typed array
*Typed array (`uInt8Array`, `int16array` …) references the `arrayBuffer` to access and modify its binary data.*
Multiple typed array can reference the same `arrayBuffer`. In such cases, the latest modification will overwrite the previous ones.
## Bonus
### Buffer (Node.Js)
`Buffer` is a Node.js object that extend from the typed array properties. It is designed to deal with communication features.
**Use case:**
Buffers are designed to handle communication logic.
**eg:** Optimise data send through requests.
Typed arrays are designed to handle processing logic.
**eg:** Adding a filter to an image
## Recap
Let’s recap this article through the following use case: “Uploading an image on a web app”
1. An image is stored on the your computer (hard drive, SSD, …)
2. Upload this image to your web app using an `<input type="file">` element
3. The browser creates a `File` object that references the image.
4.a Use the `arrayBuffer` method to load the image into memory span and reference it
5.a Attach a typed array to this arrayBuffer to read or write binary data
6.a Process the binary data
4.b Use the `stream` method to read chunk of stored image as a typed array
5.b Process the binary data chunks
I hope this article helps you gain a clearer understanding of the topic.
If you have any questions, feel free to ask me on Twitter: [@artiumWs](https://twitter.com/ArtiumWs)
---
## Sources
https://nodejs.org/api/buffer.html
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Typed_arrays
https://developer.mozilla.org/en-US/docs/Web/API/Streams_API/Concepts
https://developer.mozilla.org/en-US/docs/Web/API/Streams_API
https://developer.mozilla.org/en-US/docs/Web/API/File
https://developer.mozilla.org/en-US/docs/Web/API/Blob
https://stackoverflow.com/questions/11821096/what-is-the-difference-between-an-arraybuffer-and-a-blob#comment41489269_11821109
https://developer.mozilla.org/en-US/docs/Web/API/ReadableStream | artiumws |
1,901,878 | 🎯 Elevate Your TypeScript Skills with `type-guards-ts`! | After the success of our last article on mastering type guards, I decided to create an NPM library to... | 0 | 2024-06-26T21:35:24 | https://dev.to/geraldhamiltonwicks/elevate-your-typescript-skills-with-type-guards-ts-36k7 | typescript, javascript | After the success of our last article on mastering type guards, I decided to create an NPM library to help streamline the process. Introducing `type-guards-ts`, a comprehensive library designed to enhance your TypeScript projects with advanced type guard techniques!
Ready to master TypeScript type guards? Dive into this article to learn how to use `type-guards-ts` and make your code more robust and type-safe.
🔗 Package: https://www.npmjs.com/package/type-guards-ts
## Mastering Type Guards with `type-guards-ts`
### Description
`type-guards-ts` is a powerful TypeScript library that provides a collection of type guard functions to help you perform runtime type checks and type narrowing. This library includes functions to check if a value is of a certain type (e.g., `isBoolean`) and functions to check if a value is not of a certain type (e.g., `isNotBoolean`).
### Installation
To install the package, run the following command:
```bash
npm install type-guards-ts
```
### How to Use
To use the type guards provided by `type-guards-ts`, import the required functions from the package and use them in your TypeScript code.
```typescript
import { isBoolean } from "type-guards-ts";
const value: unknown = true;
if (isBoolean(value)) {
// TypeScript now knows that `value` is a boolean
console.log("The value is a boolean.");
} else {
console.log("The value is not a boolean.");
}
```
### Available Type Guards
#### `is-type`
- `isBigInt`
- `isBoolean`
- `isFunction`
- `isNull`
- `isNumber`
- `isObject`
- `isString`
- `isSymbol`
- `isUndefined`
#### `is-not-type`
- `isNotBigInt`
- `isNotBoolean`
- `isNotFunction`
- `isNotNull`
- `isNotNumber`
- `isNotObject`
- `isNotString`
- `isNotSymbol`
- `isNotUndefined`
### How to Use Key Type Guards
#### `isNull`
Checks if a value is `null`.
```typescript
import { isNull } from "type-guards-ts";
const value: unknown = null;
if (isNull(value)) {
console.log("The value is null.");
} else {
console.log("The value is not null.");
}
```
#### `isNotNull`
Checks if a value is not `null`.
```typescript
import { isNotNull } from "type-guards-ts";
const value: unknown = "Some value";
if (isNotNull(value)) {
console.log("The value is not null.");
} else {
console.log("The value is null.");
}
```
#### `isString`
Checks if a value is a `string`.
```typescript
import { isString } from "type-guards-ts";
const value: unknown = "Hello, world!";
if (isString(value)) {
console.log("The value is a string.");
} else {
console.log("The value is not a string.");
}
```
#### `isNotString`
Checks if a value is not a `string`.
```typescript
import { isNotString } from "type-guards-ts";
const value: unknown = 42;
if (isNotString(value)) {
console.log("The value is not a string.");
} else {
console.log("The value is a string.");
}
```
#### `isNumber`
Checks if a value is a `number`.
```typescript
import { isNumber } from "type-guards-ts";
const value: unknown = 42;
if (isNumber(value)) {
console.log("The value is a number.");
} else {
console.log("The value is not a number.");
}
```
#### `isNotNumber`
Checks if a value is not a `number`.
```typescript
import { isNotNumber } from "type-guards-ts";
const value: unknown = "42";
if (isNotNumber(value)) {
console.log("The value is not a number.");
} else {
console.log("The value is a number.");
}
```
### Conclusion
Type guards in TypeScript provide a powerful way to ensure type safety and improve code reliability. By using `type-guards-ts`, you can handle complex type checks efficiently and avoid common pitfalls associated with dynamic types. Leveraging these techniques will help you write cleaner, more maintainable code, ultimately leading to more robust applications.
---
🚀 **Ready to elevate your TypeScript skills? Install `type-guards-ts` today and ensure safe type checks in your projects!**
### Join the Conversation!
What TypeScript challenges have you faced that could benefit from enhanced type safety? Share your experiences and join the conversation! | geraldhamiltonwicks |
1,901,876 | Introdução às linguagens de programação | Introdução No mundo da programação, entender as diferenças entre linguagens de baixo... | 0 | 2024-06-26T21:31:07 | https://dev.to/moprius/introducao-a-linguagens-de-programacao-4j90 | programming, cpp, rust, python | ## Introdução
No mundo da programação, entender as diferenças entre linguagens de baixo nível, médio nível e alto nível é essencial para qualquer desenvolvedor. As linguagens de baixo nível, como código da máquina e Assembly, proporcionam controle direto sobre o hardware, permitindo otimizações precisas de desempenho, mas exigem um conhecimento profundo da arquitetura do sistema e são notoriamente difíceis de aprender e usar. Outras linguagens de médio nível, como C e Rust, oferecem um equilíbrio entre controle de hardware e abstração, combinando a eficiência das linguagens de baixo nível com a acessibilidade das de alto nível. Elas são versáteis e amplamente utilizadas em diversas áreas, desde sistemas operacionais até desenvolvimento de jogos. Já as linguagens de alto nível, como C++, Java, Python, JavaScript, são projetadas para serem as mais amigáveis ao usuário, proporcionando uma sintaxe intuitiva e recursos avançados que facilitam o desenvolvimento rápido e a manutenção do código. Cada nível tem suas próprias vantagens e desvantagens, e a escolha da linguagem ideal depende das necessidades específicas do projeto e das preferências do desenvolvedor. Vamos conhecer como elas funcionam.
## Linguagens de Programação de Baixo Nível
As linguagens de programação de baixo nível são aquelas que oferecem pouca ou nenhuma abstração da arquitetura de hardware de um computador. Elas são frequentemente descritas como linguagens "próximas do hardware", ou seja, são projetadas para interagir diretamente com os componentes físicos do computador. Por isso, costumam ser específicas para uma determinada arquitetura de computador.
### Vantagens das linguagens de programação de baixo nível
Programas escritos em linguagens de baixo nível são geralmente mais eficientes em termos de velocidade de execução e uso de memória. Eles têm controle total sobre componentes de hardware, registradores e memória, proporcionando um alto nível de controle sobre o comportamento do programa. Isso pode ser fundamental em ambientes com armazenamento limitado.
### Desvantagens das linguagens de programação de baixo nível
Essas linguagens exigem um entendimento profundo da arquitetura de hardware, tornando o aprendizado muitas vezes desafiador e difícil. Escrever programas em linguagens de baixo nível frequentemente requer mais tempo e esforço do que em linguagens de alto nível. Esses programas são muitas vezes específicos para uma arquitetura particular, dificultando a transferência para diferentes plataformas ou outras arquiteturas. Como essas linguagens fornecem acesso direto à memória e ao hardware, há um maior risco de erros de programação que podem levar a falhas no sistema.
**Exemplos incluem Código da máquina e Assembly:**
**Código de máquina:** Esta é a forma mais baixa de linguagem de programação, consistindo em código binário que representa diretamente instruções executadas pela CPU.
**Linguagem Assembly:** As linguagens Assembly são específicas para uma arquitetura de CPU particular e fornecem uma representação simbólica das instruções de código de máquina. Por exemplo, processadores Intel requerem Assembly x86.
***Exemplos:***
Hello, World, em Assembly
```
section .data
hello db 'Hello, World!', 0x0A ; Mensagem a ser impressa com nova linha no final
section .text
global _start
_start:
; Chamada de sistema para escrever (sys_write)
mov eax, 4 ; syscall número (sys_write)
mov ebx, 1 ; arquivo descriptor (stdout)
mov ecx, hello ; ponteiro para a mensagem
mov edx, 13 ; comprimento da mensagem
int 0x80 ; chamada de interrupção
; Chamada de sistema para sair (sys_exit)
mov eax, 1 ; syscall número (sys_exit)
xor ebx, ebx ; status de saída 0
int 0x80 ; chamada de interrupção
```
Adição de Dois Números
```
section .data
num1 db 5 ; Primeiro número
num2 db 10 ; Segundo número
section .bss
result resb 1 ; Espaço para o resultado
section .text
global _start
_start:
mov al, [num1] ; Carrega o primeiro número em AL
add al, [num2] ; Adiciona o segundo número ao valor em AL
mov [result], al ; Armazena o resultado
; Saída do programa
mov eax, 1 ; syscall número (sys_exit)
int 0x80 ; chamada de interrupção
```
As linguagens de baixo nível são a escolha certa quando a prioridade é o controle preciso sobre o hardware, a otimização de desempenho e a eficiência máxima, mesmo que isso signifique sacrificar um pouco da velocidade de desenvolvimento, da manutenção do código e da facilidade de uso oferecidas pelas linguagens de alto nível.
## Linguagens de Programação de Nível Médio
As linguagens de nível médio não são uma categoria oficial amplamente reconhecida ou claramente definida dentro da academia, mas o termo é ocasionalmente usado para descrever linguagens que possuem características de ambas as linguagens de alto e baixo nível. Na prática, o conceito de linguagens de nível médio é mais uma conveniência de descrição do que uma classificação acadêmica. Elas tentam equilibrar a acessibilidade das linguagens de alto nível com o controle detalhado sobre o hardware oferecido pelas linguagens de baixo nível, podendo oferecer abstrações mais simples que as linguagens de baixo nível, mas ainda permitem uma manipulação mais direta dos recursos do sistema.
### Vantagens das linguagens de programação de nível médio
As linguagens de nível médio fornecem uma combinação de controle detalhado sobre o hardware e abstração suficiente para tornar a programação mais intuitiva e legível do que as linguagens de baixo nível. Programas escritos em linguagens de nível médio são mais portáteis do que aqueles escritos em linguagens de baixo nível, embora possam exigir alguns ajustes específicos de plataforma. Essas linguagens são mais amigáveis ao usuário do que as linguagens de baixo nível, o que pode levar a um aumento na produtividade dos desenvolvedores. As linguagens de nível médio são adequadas para uma ampla gama de aplicações, oferecendo um bom equilíbrio entre desempenho e facilidade de uso.
### Desvantagens das linguagens de programação de nível médio
Embora as linguagens de nível médio sejam geralmente mais fáceis de aprender do que as de baixo nível, ainda podem ser algumas vezes desafiadores, especialmente para iniciantes. Elas não oferecem o mesmo nível de controle sobre o hardware que as linguagens de baixo nível. Frequentemente, dependem de bibliotecas para funcionalidades específicas.
Exemplos de linguagem incluem C e Rust.
**C:** É uma linguagem de programação que oferece uma combinação de abstração de alto nível com controle detalhado sobre o hardware. Ela permite manipulação direta de memória através do uso de ponteiros e oferece um desempenho muito próxima à do código de máquina, sendo amplamente utilizada para desenvolvimento de sistemas operacionais, drivers e outras aplicações de baixo nível.
**Rust:** É uma linguagem moderna que equilibra segurança e desempenho. Ela proporciona abstrações de alto nível como segurança de memória e gestão de concorrência sem coletor de lixo, ao mesmo tempo que permite controle de baixo nível semelhante ao C. Rust é usada para desenvolver software de sistemas, aplicações de desempenho crítica e é conhecida por sua ênfase na segurança e prevenção de erros de memória.
***Exemplos:***
Hello, World em C
```
#include <stdio.h>
int main() {
// Imprime "Hello, World!" na tela
printf("Hello, World!\n");
return 0;
}
```
Adição de dois números em C
```
#include <stdio.h>
int main() {
int num1, num2, soma;
// Solicita ao usuário que insira o primeiro número
printf("Digite o primeiro número: ");
scanf("%d", &num1);
// Solicita ao usuário que insira o segundo número
printf("Digite o segundo número: ");
scanf("%d", &num2);
// Calcula a soma dos dois números
soma = num1 + num2;
// Exibe o resultado
printf("A soma de %d e %d é %d\n", num1, num2, soma);
return 0;
}
```
Hello, World em Rust
```
fn main() {
// Imprime "Hello, World!" na tela
println!("Hello, World!");
}
```
Adição de dois números em Rust
```
use std::io;
fn main() {
// Solicita ao usuário que insira o primeiro número
println!("Digite o primeiro número:");
let mut num1 = String::new();
io::stdin().read_line(&mut num1).expect("Falha ao ler a linha");
let num1: i32 = num1.trim().parse().expect("Por favor, insira um número inteiro");
// Solicita ao usuário que insira o segundo número
println!("Digite o segundo número:");
let mut num2 = String::new();
io::stdin().read_line(&mut num2).expect("Falha ao ler a linha");
let num2: i32 = num2.trim().parse().expect("Por favor, insira um número inteiro");
// Calcula a soma dos dois números
let soma = num1 + num2;
// Exibe o resultado
println!("A soma de {} e {} é {}", num1, num2, soma);
}
```
As linguagens de nível médio oferecem um compromisso entre a eficiência e o controle das linguagens de baixo nível e a facilidade de uso das linguagens de alto nível. São uma escolha equilibrada para desenvolvedores que procuram um meio-termo entre controle e usabilidade.
## Linguagens de Programação de Alto Nível
As linguagens de programação de alto nível são feitas para serem o mais amigáveis possível. Elas oferecem uma alta abstração da arquitetura de hardware do computador e são conhecidas por sua simplicidade e legibilidade. Essas linguagens permitem que os desenvolvedores escrevam programas usando uma sintaxe próxima da linguagem natural, eliminando grande parte da complexidade associada à programação de baixo nível. Elas são especialmente ótimas para aplicativos onde a velocidade de desenvolvimento, a manutenção e a facilidade de uso são mais importantes do que o controle de baixo nível e otimizações de desempenho.
### Vantagens das linguagens de programação de alto nível
Muitas linguagens de alto nível possuem uma sintaxe parecida com o inglês, o que as torna mais fáceis para iniciantes aprenderem e usarem. Não é à toa que programar em linguagens de alto nível é mais rápido e eficiente do que em linguagens de baixo ou nível médio. Programas escritos em linguagens de alto nível são geralmente portáteis entre diferentes plataformas com poucas ou nenhuma modificação. Essas linguagens frequentemente incluem recursos como tipagem dinâmica, gerenciamento automático de memória (coleta de lixo) e bibliotecas integradas para facilitar o processo de desenvolvimento. Elas não exigem operações complicadas, como gerenciamento de memória e detalhes específicos de hardware, permitindo que os desenvolvedores se concentrem em resolver problemas em um nível mais alto.
### Desvantagens das linguagens de programação de alto nível
As linguagens de alto nível abstraem muitos detalhes de hardware, dando menos controle sobre os recursos do computador. Aplicações escritas nela podem consumir muitos recursos do sistema, como memória e poder de processamento. Essas linguagens dependem frequentemente de bibliotecas e frameworks para diversas funcionalidades.
Exemplos de linguagens de programação de alto nível em uso hoje incluem C++, Java, C#, Python, JavaScript e muitas outras.
***Exemplos***
Hello, World em C++
```
#include <iostream>
int main() {
// Imprime "Hello, World!" na tela
std::cout << "Hello, World!" << std::endl;
return 0;
}
```
Adição de dois números em C++
```
#include <iostream>
int main() {
int num1, num2, sum;
// Solicita ao usuário que insira o primeiro número
std::cout << "Digite o primeiro número: ";
std::cin >> num1;
// Solicita ao usuário que insira o segundo número
std::cout << "Digite o segundo número: ";
std::cin >> num2;
// Calcula a soma dos dois números
sum = num1 + num2;
// Exibe o resultado
std::cout << "A soma de " << num1 << " e " << num2 << " é " << sum << std::endl;
return 0;
}
```
Hello, World em Python
```
# Este programa imprime "Hello, World!" na tela
print("Hello, World!")
```
Adição de dois números em Python
```
# Solicita ao usuário que insira o primeiro número
num1 = float(input("Digite o primeiro número: "))
# Solicita ao usuário que insira o segundo número
num2 = float(input("Digite o segundo número: "))
# Calcula a soma dos dois números
soma = num1 + num2
# Exibe o resultado
print("A soma de {} e {} é {}".format(num1, num2, soma))
```
As linguagens de alto nível são a escolha certa quando a prioridade é a velocidade de desenvolvimento, a manutenção do código e a facilidade de uso, mesmo que isso signifique sacrificar um pouco do controle e da eficiência oferecidos pelas linguagens de baixo nível.
## Considerações finais
A escolha da linguagem de programação ideal depende do equilíbrio e da necessidade entre o controle sobre o hardware e a abstração necessária para o desenvolvimento eficiente de software. Seja na construção de sistemas operacionais robustos e eficientes utilizando linguagens de baixo nível, na criação de aplicações versáteis e portáteis com linguagens de médio nível, ou no desenvolvimento ágil de soluções de software complexas com linguagens de alto nível, cada categoria de linguagem de programação desempenha um papel na evolução da tecnologia e na resolução de problemas diversos. | moprius |
1,901,875 | Новая нейросеть | О существовании нейросетей общественность узнала недавно, но они быстро проникли в различные сферы... | 0 | 2024-06-26T21:30:54 | https://dev.to/tutuev_aleksandar/novaia-nieirosiet-2p2p | О существовании нейросетей общественность узнала недавно, но они быстро проникли в различные сферы жизни — от медицины до развлечений. Сегодня они способны обрабатывать огромные объемы данных, распознавать объекты и генерировать тексты и изображения. Последние тренды нейросетей включают метаобучение, обработку естественного языка, обучение с подкреплением, генеративные модели, автокодировщики и GANs. Разработчики работают над улучшением существующих моделей и созданием новых - https://chataibot.ru/blog/novyye_neiroseti/[](https://chataibot.ru/blog/novyye_neiroseti/) Недавно была выпущена усовершенствованная версия ChatGPT, способная распознавать и описывать изображения и лучше понимать контекст. Также была разработана генеративная модель MuseNet, которая может создавать музыку в различных стилях и жанрах. Особое внимание уделяется улучшению обработки изображений, анализа текста, обучения с подкреплением и созданию видео. Новые алгоритмы и техники обучения позволяют нейросетям становиться более гибкими и адаптивными к разным сценариям использования. | tutuev_aleksandar | |
1,901,873 | A musical lesson on learning hard things, and a polite game of tic-tac-toe | I have a programming nemesis: Python dictionaries. I don’t know why, but for some reason they never... | 0 | 2024-06-26T21:27:01 | https://dev.to/codingtitan/a-musical-lesson-on-learning-hard-things-and-a-polite-game-of-tic-tac-toe-4m87 | I have a programming nemesis: Python dictionaries. I don’t know why, but for some reason they never clicked for me. Lists, no problem. Tuples, sure. Even more complex stuff like classes - you got it, pal.
But dictionaries, for some reason, are the ungodly spawn of all my bad karma. I just can’t wrap my head around them.
—
Growing up, I learned to play the piano by myself. I got quite good - I even got in to a music-specialised high school. There, I finally got myself a teacher. Come first class, we played around a bit to give her a feel for how well I played (she assessed me as a level 3 of 3, thanks for asking), and then she gave me some homework.
I went home, energized by my recent ranking. This should be no problem for a level 3 guy like me!
I sat down at the piano, looking properly at it, and… well, it was hard. I mean 8-keys-pressed-at-once-with-no-discernible-system-over-and-over hard. I tried a few times, then went back to playing stuff I already knew. Screw that.
Before I knew it, a week had passed and it was time for my second lesson. I dreaded going - I hadn’t so much as gotten through the first couple of chords. When I got to the lesson, sullen and silent, the teacher chirped “How did the homework go?”. I was devastated – I had been exposed as a fraud, who couldn’t even play the first homework assigned to me.
“You didn’t do it, did you?”, she said. I replied that I hadn’t.
“I knew that you wouldn’t. That’s why I gave it to you! When I heard you play, I could tell right away that you like to stick to what you know, playing what’s already comfortable. That’s not how to get really good at something. You have to do things that are uncomfortable. So, for the foreseeable future, we will work on fixing that.”
I was surprised, and felt quite dumb.
“For this week’s homework, I want you to play just the first 4 measures of the song” (ergo the first couple of seconds). “We’’ll start working on it here in class, and then you can continue at home. OK?”
I agreed, and as the weeks went by we slowly progressed through what turned out to be a quite pleasant Bossa Nova tune. After a few months, I could play the whole thing without hiccups, and we moved on to less hardcore material. I forget what.
But I never forgot the experience with the Bossa Nova challenge.
—
Right now, I’m not learning how to play the piano. I’m learning Python. When deciding what to build for my next practice project – crafted to perfection, useful to nobody – I went the classic tic-tac-toe. I made a quick plan, based on a grid system, and then got to coding. I started off by making a couple of lists, and figured that the easiest way would be to move coordinates between three lists - one for available coordinates, and one for each player’s placed circles and crosses.
Then I remembered the Bossa Nova lesson, and realized I was doing the same thing all over again - sticking to what’s comfortable. I came to a realization - I needed to make the game dictionary-based. Not because it necessarily is the best way to make a tic-tac-toe game, but because I felt a resistance there. I didn’t want to do it, because I was not entirely sure how to do it. In fact, I wasn’t even sure how to script the logic for winning the game.
After some initial frustration, I got it working. Having gone through the uncomfortable-ness of manually creating a coordinate system in a dict, I rewarded myself with adding some creative writing to give the game some personality.
[You can find it here.](https://github.com/coding-titan/tictactoe)
I’m realizing that coding, like learning any skill, requires you to be uncomfortable - doing things you’re not sure how to do, staying patient and working through it. It may provide som initial resistance, but when you get to the finish line - whether that means a catchy tune or a text-based tic-tac-toe game nobody is going to play - it feels so much more worth it. Just remind yourself of that, and keep going - oine measure, or dictionary, at a time.
P.S. Would love any feedback on the code!
| codingtitan | |
1,901,871 | Let's talk about CSSBattles | Recently I discovered a great website to exercise my CSS skills in a different way daily. CSSBattle... | 0 | 2024-06-26T21:22:53 | https://dev.to/thaisavieira/lets-talk-about-cssbattles-1cgo | css, learning | Recently I discovered a great website to exercise my CSS skills in a different way daily. [CSSBattle](https://cssbattle.dev/) offers every day a different "target", a design you should make as close as possible with CSS. I highly recommend it cause it helps me to get more familiar with CSS proprieties like margin, padding, display, and more.
Would you like to join and/or share your results with me? I'm always looking for new ways of doing the target cause sometimes I think I did it the hard way.
| thaisavieira |
1,901,828 | Unlocking the Power of Utility Functions and Custom Hooks in React | Diving into utility functions and custom hooks can transform your React projects, let's learn by... | 0 | 2024-06-26T21:13:36 | https://dev.to/trisogene/unlocking-the-power-of-utility-functions-and-custom-hooks-in-react-3mlb | customhook, react, reusable, cleancode | Diving into utility functions and custom hooks can transform your React projects, let's learn by watching some examples!
## 🛠 Utility functions
- Can be used outside of react component
- Provide reusability and reduce code length
```js
// utils.js
export const capitalizeWords = (str) => {
if (!str) return "";
return str.replace(/\b\w/g, (char) => char.toUpperCase());
};
```
```js
// App.js
import { capitalizeWords } from "./utils/capitalizeWords";
const App = () => {
const title = "welcome to my website";
const subTitle = "im the magical programmer";
const description = "i have a magical refactor wand!";
return (
<div>
<h1>{capitalizeWords(capitalizedTitle)}</h1>
<h3>{capitalizeWords(subTitle)}</h3>
<p>{capitalizeWords(description)}</p>
</div>
);
};
export default TitleComponent;
```
## 🪝 Custom Hooks without State
- Can only be used inside react components
```js
// useLogger.js
import { useEffect } from "react";
const useLogger = (message) => {
useEffect(() => {
console.log(message);
}, [message]);
};
export default useLogger;
```
```js
// App.js
import React from "react";
import useLogger from "./hooks/useLogger";
const App = () => {
useLogger("LoggerComponent has mounted.");
return (
<div>
<p>Check your console to see the log messages.</p>
</div>
);
};
export default App;
```
## 📦 Custom Hooks with State
- State **WILL NOT** be shared between component that use the same custom hooks
```js
// useFetchData.js
import { useState, useEffect } from "react";
const useFetchData = (url) => {
const [data, setData] = useState(null);
const [loading, setLoading] = useState(true);
const [error, setError] = useState(null);
useEffect(() => {
const fetchData = async () => {
try {
setLoading(true);
const response = await fetch(url);
const result = await response.json();
setData(result);
} catch (err) {
setError(err.message);
} finally {
setLoading(false);
}
};
fetchData();
}, [url]);
return { data, loading, error };
};
export default useFetchData;
```
```js
// App.js
import useFetchData from "./hooks/useFetchData";
const App = () => {
const { data, loading, error } = useFetchData("https://api.example.com/data");
if (loading) return <p>Loading...</p>;
if (error) return <p>Error: {error}</p>;
return (
<div>
<h1>Fetched Data</h1>
<pre>{JSON.stringify(data, null, 2)}</pre>
</div>
);
};
export default App;
```
## 🔄 Custom Hooks with Selector/Context
- Since we are using redux/context it will share the state between component that use the same hook
- When the redux state used by the custom hook change all the component that use the custom hook will re-render
```js
// useUser.js
import { useSelector } from "react-redux";
const useUser = () => {
const user = useSelector((state) => state.user);
const fullName = `${user.name} ${user.surname}`;
return { ...user, fullName };
};
export default useUser;
```
```js
// App.js
import useUserProfile from "./hooks/useUserProfile";
const App = () => {
const { fullName, email } = useUser();
return (
<div>
<h1>User Profile</h1>
<p>Full Name: {fullName}</p>
<p>Email: {email}</p>
</div>
);
};
export default UserProfile;
```
## Conclusion
Utility functions and custom hooks can change your React development process for the better , making your code not just work better but also cleaner and more professional.
Thank you for reading this, i hope you enjoyed :D
| trisogene |
1,901,824 | The Magic of SAP: A Comprehensive Guide for Begginers | In the process of our IT life, each of us will surely encounter the word SAP one day. But what is... | 0 | 2024-06-26T21:10:50 | https://dev.to/sramek5/the-magic-of-sap-a-comprehensive-guide-for-begginers-19jc | sap, erp, architecture |
In the process of our IT life, each of us will surely encounter the word SAP one day. But what is actually SAP and how does it actually work? The official vendor documentation is clear on this and defines SAP as following: `SAP is one of the world’s leading producers of software for the management of business processes.` That is not entirely clear. Even a literal German translation - **Systemanalyse Programmentwicklung** - will not help us too much.
SAP is basicly collection of Systems, Applications, and Products in Data Processing. It is provider of enterprise software solutions designed to enhance business processes and efficiency. One of SAP's key products is so-called SAP ECC (i.e. ERP Central Component), with extra indication R3, which refers to its architecture based on Real-Time data processing and a three-tier structure.
This architecture includes the presentation layer, application layer, and database layer, working together to provide robust, scalable, and flexible Enterprise Resource Planning (ERP) solutions that support a wide range of business functions.
## Presentation Layer
The presentation layer in SAP R3 architecture is crucial for facilitating user interaction with the system. This layer provides input capabilities for users to manipulate the system and output functionalities for generating results based on user actions. The primary interface for users interacting with SAP applications is the SAP GUI, which is installed on individual machines. Through SAP GUI, users can access various SAP modules and execute transactions, run reports, and perform data entry tasks. The presentation layer ensures a seamless and intuitive user experience, translating complex backend processes into comprehensible visual elements, thereby enhancing user productivity and system usability.
## Application Layer
The application layer serves as the core of the system, processing business logic and managing communication between the presentation and database layers. A key component of this layer is the **Web Dispatcher**, which acts as a critical gateway between the Internet and SAP systems. It handles HTTP(s) requests, balances the load across multiple SAP NetWeaver application servers, and enhances system security by filtering URLs and supporting SSL encryption. The Web Dispatcher is compatible with both pure ABAP (high-level programming language cretaed by SAP) and Java systems.
Within the application layer, various **ABAP Processes** are essential for efficient system operations:
1. **Dialog Process (DIA):** Manages the interaction between the user and the system, handling immediate transaction requests.
2. **Background Process (BGD):** Executes long-running or scheduled tasks that do not require real-time user interaction.
3. **Spool Process (SPO):** Manages print requests and the overall printing process.
4. **Update Process (UDP):** Responsible for updating data in the database, ensuring that changes are correctly saved.
5. **Enqueue Process (ENQ):** Handles the locking of data to maintain consistency and integrity during concurrent access.
Additionally, the application layer includes crucial **ABAP Services**:
1. **Message Service:** Ensures load balancing across different SAP server instances, routing and delivering messages efficiently.
2. **Enqueue Replication Server (ERS):** Maintains a synchronized replica of the lock table on a secondary NetWeaver server, ensuring data consistency and enabling automatic failover in the event of a primary server failure.
Together, these components and services ensure that the application layer functions effectively, supporting robust and reliable enterprise resource planning for businesses.
## Database Layer
The database layer is responsible obviously for storing and retrieving data, forming the foundation of the entire system. While SAP does not provide its own database system, it supports integration with leading relational database management systems (RDBMS) such as Oracle, DB2, and HANA. HANA, a multi-model database, is particularly notable for its ability to store data in memory rather than on a disk, which significantly enhances processing speeds compared to traditional database management systems.
HANA's integration includes High Availability and Disaster Recovery (HA/DR) capabilities through so-called HANA System Replication (HSR). This mechanism ensures high availability by automatically switching to a standby host in case of a primary host failure. It uses _synchronous_ data replication to maintain data consistency between the primary and standby hosts, thus minimizing downtime and ensuring data integrity.
This layer's robustness is critical for the overall performance of the SAP system, as it handles large volumes of transaction data, supports complex queries, and ensures data integrity and security. The database layer's compatibility with top-tier relational database management system (RDBMS) and advanced features like HANA's in-memory storage and HSR replication make it a powerful component of the SAP ECC R3 architecture, enabling businesses to process and analyze data with exceptional speed and reliability.
## Trivia
The following abbreviations are also associated with SAP:
- **PAS** = Primary Application Server.
- **AAS** = Additional Application Server.
- **ASCS** = ABAP Central Services (core of the SAP application service)
The differences between PAS and AAS:
- The PAS contains the ASCS, but an AAS does not.
- In a system, there is only one PAS, but there can be multiple AASs. The number depends on the service requirements.
## Conclusion
SAP stands globally as a leading provider of enterprise software solutions, helping organizations streamline and optimize their business processes. With its robust architecture and integration capabilities, SAP enables efficient management of complex operations, enhancing productivity and decision-making. SAP's adaptability with various database systems and its advanced features ensure it remains a vital tool for businesses aiming for growth and operational excellence. | sramek5 |
1,901,819 | Building a basic HTTP server with Go | Go or Go lang as it’s commonly referred to is a wannabe system’s programming language originally... | 0 | 2024-06-26T21:10:47 | https://dev.to/kalashin1/building-a-basic-http-server-with-go-387m | go, api, learning, backend | Go or Go lang as it’s commonly referred to is a wannabe system’s programming language originally designed and developed at Google, it’s aim was to be the ultimate replacement for C/C++. Go incorporates modern programming language features like type inference and generics while presenting itself in an effortless and minimalist style, Go has borrowed concepts from Typescript, Javascript, and Python.
Go has been used to buy some awesome projects like the open-source Pocketbase server amongst others and in today’s post we will expo how to set a basic REST server with Go and as such we will cover the following talking points;
- Project Setup
- Create a basic Server with net/http
- Parsing request headers
- Parsing request query params
- Parsing request body
## Project Setup
The first thing to do is to ensure you have the Go compiler installed on your machine, if you don’t have it installed then you can download and install the Go executable and ensure that the GoPath is correctly configured. Now let’s set up a Go project, first navigate into your projects directory to create a Go project.
```bash
mkdir go_server && go mod init
```
This will create a go package for us, now we need to navigate into the newly created folder and create a new go file, `index.go`. This file will house the content of our server.
```bash
cd go_server
```
## Create a basic Server with net/http
Now we have our project all set up let's add the following code to our `index.go` file,
```go
package main
import (
"fmt"
"log"
"net/http"
)
func sayHello(w http.ResponseWriter, req *htt.Reques) {
fmt.FPrintf(w, "Hello World")
}
main () {
http.handleFunc("/", sayHello);
log.Println("Server listening on port", 8080);
http.ListenAndServer(":8080", nil);
}
```
The code snippet above demonstrates how to set up a basic HTTP server with Go, we need to declare a package for the current Go module, and then we import a bunch of packages from the standard Go library, the `fmt` package is responsible for formatted printing and input/output operations. The `log` package in the Go standard library provides basic logging functionality. The net/http package in the Go standard library provides a powerful and comprehensive set of tools for building both HTTP servers and clients in Go.
The `sayHello` function is a route handler function, it accepts two arguments, the first is the response object, while the second is the request object. We use the `FPrintf` function to write a message to the response body, this also effectively ends the request. Inside our main function, we register the `sayHello` function as a handler for the `/` route. Then we use the `Println` function from the `log` package to notify us when our server starts up. Then we use the `ListenAndServe` method on the `http` package to create a server on port `8080`.
The `ListenAndServe` method accepts two arguments, The first is a string that specifies the network address and port on which the server will listen for incoming HTTP requests. It's typically formatted as "hostname:port" or just ":port". The second argument is an optional interface that can be used to customize the overall request-handling behavior of the server. In most cases, you'll leave this argument as nil and rely on specific handler functions registered using http.HandleFunc or other routing mechanisms.
## Parsing request headers
There are times when you are interested in parsing the request and that is standard when building an API so in the next snippet we'll see how we can do just that;
```go
package main
// cont'd
var headers map[string]string
func sayHello(w http.ResponseWriter, req *http.Request) {
for key, values := range req.Header {
headers[key] = values[0]
}
log.Println(headers) // do h
fmt.Fprint(w, "Hello, World!")
}
// cont'd
main () {
headers = make(map[string]string)
// cont'd
}
```
First, we create a new map object `header` to store the contents of the request headers, inside our `main` function we initialize the `headers` to be an empty map object. Inside the `sayHello` function we loop through the request headers and for each key on the request header we create a similar key on the `headers` map object and its value is the value of the key on the request header then we print the `headers` object to the console.
## Parsing Request Query Parameters
To parse the request query parameters we just need to add a few extra lines of code to our handler function;
```go
// cont'd
func sayHello(w http.ResponseWriter, req *http.Request) {
// cont'd
// Get all query parameters as a map
queryParams := req.URL.Query()
// Access specific parameters
name := queryParams.Get("name")
log.Println(name)
// cont'd
}
// cont'd
```
We use the `req.URL.Query()` method of the `http.Request` object to access the query string parameters as a `url.Values` map. Then `queryParams.Get("name")` retrieves the value for the "name" parameter as a string or an empty string if not present.
## Parsing request body
```go
package main
import (
"encoding/json"
"io"
// cont'd
)
type Payload struct {
Id string
}
// cont'd
func sayHello (w http.ResponeWriter, req http.Request) {
// cont'd
body, err := io.ReadAll(req.Body)
if err != nil {
log.Println("Error reading request body:", err)
w.WriteHeader(http.StatusBadRequest)
fmt.Fprintf(w, "Error reading request body")
return
}
var payload Payload
err = json.Unmarshal(body, &payload)
if err != nil {
log.Println("Error parsing JSON body:", err)
w.WriteHeader(http.StatusBadRequest)
fmt.Fprintf(w, "Invalid JSON format in request body")
return
}
log.Println("payload", payload.Id)
// cont'd
}
// cont'd
```
We have imported two new packages `encoding/json` and `io`. Next, we create a struct to serve as a type for the request body. Inside our handler function we call `io.ReadAll` and pass the `req.Body` as an argument to the `ReadAll` method we just called.
This method returns two values we can destructre out, the request body and an error object. If there's an error we notify the user and end the request, otherwise we create a payload variable of type `Payload` and call `json.UnMarshall` and pass the `body` as the first argument to it and a pointer to the `payload` variable we just created. If there’s an error while trying to convert the body of the request we notify the user that their JSON is invalid then we end the request as a bad request, otherwise, we just log out the `Id` of the payload and continue with the rest of the code.
| kalashin1 |
1,901,821 | How can I set up an SMTP email relay on a debian server? | I am trying to set up an SMTP email relay. Does anyone know any guides for doing that? | 0 | 2024-06-26T21:07:38 | https://dev.to/lauralaura/how-can-i-set-up-an-smtp-email-relay-on-a-debian-server-12n1 | emai, debian, smtp | I am trying to set up an SMTP email relay. Does anyone know any guides for doing that? | lauralaura |
1,901,820 | Azure Cost Optimization: Your Guide to Smart Cloud Spending | Microsoft Azure offers a robust and scalable cloud platform for businesses of all sizes. However, the... | 0 | 2024-06-26T20:58:09 | https://dev.to/unicloud/azure-cost-optimization-your-guide-to-smart-cloud-spending-ep7 | azure | Microsoft Azure offers a robust and scalable cloud platform for businesses of all sizes. However, the flexibility and power of Azure can sometimes lead to unexpected costs if not managed strategically. [Azure cost optimization](https://unicloud.co/blog/azure-cost-optimization-strategies-to-maximize-your-cloud-savings/) is the practice of maximizing the value you get from your Azure investment while minimizing unnecessary expenses. This comprehensive guide will help you understand the key strategies and tools to optimize your Azure costs.
**Why Azure Cost Optimization is Essential**
The pay-as-you-go nature of cloud computing, while offering flexibility, can lead to escalating costs if not monitored carefully. Azure cost optimization helps you:
**- Gain Control of Your Cloud Budget:** Understand where your money is going and identify opportunities to reduce waste.
**- Maximize ROI:** Get the most value out of your Azure services by ensuring you're only paying for what you need.
**- Improve Forecasting:** Accurately predict your Azure expenses to budget effectively and avoid surprises.
**- Drive Efficiency:** Optimize your Azure environment to achieve peak performance without overspending.
**Key Azure Cost Optimization Strategies**
**1. Rightsizing Azure Resources:** Ensure your virtual machines, databases, and other resources are appropriately sized for your workloads. Azure Advisor provides recommendations for rightsizing based on utilization data. You can also leverage Azure Cost Management to analyze usage patterns and identify overprovisioned resources.
**2. Azure Reservations:** Commit to one- or three-year terms for specific Azure services and get significant discounts compared to pay-as-you-go pricing. Azure Reservations are ideal for predictable workloads.
**3. Azure Hybrid Benefit:** If you have existing on-premises Windows Server or SQL Server licenses with Software Assurance, you can use them in Azure to save on virtual machine costs.
**4. Azure Spot Virtual Machines:** For workloads that can tolerate interruptions, Azure Spot VMs offer steep discounts (up to 90%) compared to on-demand pricing.
**5. Azure Storage Optimization:** Choose the right storage type for your data based on its access frequency and performance requirements. Archive infrequently accessed data to lower-cost storage tiers, such as Azure Blob Storage Archive tier.
**6. Automation and Scaling:** Automate scaling of your Azure resources based on demand to ensure you have enough capacity during peak times while avoiding overprovisioning during off-peak hours.
**7. Azure Cost Management and Billing:** This powerful tool provides a centralized view of your Azure costs, enabling you to track spending, analyze usage patterns, and identify cost-saving opportunities.
**8. Azure Advisor:** This free service analyzes your Azure resources and provides personalized recommendations for improving performance, security, and cost optimization.
**9. Azure Policy:** Use Azure Policy to enforce cost-saving rules, such as automatically shutting down unused virtual machines or ensuring resources are tagged for proper cost allocation.
**10. Serverless Computing:** Consider serverless architectures like Azure Functions or Azure Logic Apps for event-driven workloads. You only pay for the actual execution time, eliminating the need to provision and manage servers.
**Unicloud: Your Azure Cost Optimization Partner**
Unicloud specializes in helping businesses optimize their Azure costs. Our team of certified Azure experts can assess your current environment, identify cost-saving opportunities, and implement tailored solutions to help you maximize your Azure ROI.
We offer a range of Azure cost optimization services, including:
**- Azure Cost Assessment:** A detailed analysis of your Azure spending to identify areas for improvement.
**- Cloud Optimization Roadmap:** A customized plan to achieve your cost optimization goals.
**- Ongoing Cost Management:** Continuous monitoring and optimization of your Azure resources.
**Conclusion**
[Azure cost optimization](https://unicloud.co/aws-cloud-services.html) is an ongoing process that requires proactive management and a commitment to best practices. By implementing the strategies and tools outlined in this guide, you can take control of your Azure costs, maximize the value of your cloud investment, and free up resources for innovation and growth.
Let [Unicloud](https://unicloud.co/) be your trusted partner in your Azure cost optimization journey. Contact us today for a free consultation and discover how we can help you optimize your Azure spending.
| unicloud |
1,901,795 | AWS - A brief introduction | Okay, everybody knows that "DevOps" is the new "thing" in the IT area, the reason for that is mainly... | 0 | 2024-06-26T20:51:41 | https://dev.to/pokkan70/aws-a-brief-introduction-46ai | aws, cloud, devops, cloudpractitioner | Okay, everybody knows that "DevOps" is the new "thing" in the IT area, the reason for that is mainly because of the huge popularity of many cloud providers, and that popularity has a good reason:
Nobody wants anymore to host an entire data center inside of a company building, okay maybe you could see some companies doing that like Cipsoft (the company behind Tibia) as they showed us when Tibia did 25 years:
[](https://youtu.be/-EN7Ou5BtBo?si=M-BWcFWuxo5KkUUv&t=38 "Tibia 25 years")
But the truth is, if wanna build a new software from scratch, it's a bad idea to do that using a data center in nowadays. The first guy to notice it as a way to offer "cloud as a service" is Jeff Bezos. Okay, maybe we have other people and other companies that have done it before, but Bezos was the guy who started it on a huge scale, only after him did we get other companies doing it with more effort like Microsoft or Google.
<h1> So... What are the advantages of using AWS? </h1>
1. **First we've the agility!** Noticing that you don't need anymore to take care of a physical data center, you get more time to care about the logic and configuration of your server
2. **Second we've "Security"**, but that's a sensible topic. Before anything, it's necessary to say that AWS is not 100% secure, the reason for that is because the security of your app starts with your app! If there's any blind spot in your code, it doesn't matter if you're using AWS or any other provider.
3. **We've scalability**, but that topic is a double-edged sword. Once Uncle Bob said that a company could close its doors because of a bad code, but nobody paid much attention to that because it sounded like something from another world. But I've seen it with my own eyes, A company that I worked before closed its doors because of a bad code base, everybody tried to advise the CEO about it but he didn't care until he could not pay AWS anymore... On the other hand, I worked for a company that had a huge base of users and a large quantity of requests per day, and I'll not say numbers but I swear, only because of the code quality, they're paying less than the first company I said.
<h1> But pay attention to Scalability! </h1>
When you make a new AWS account, you have for free a total of 750 hours per month of EC2 instances (EC2 is like "Amazon virtual computers", I'll talk more about it in the next post). And also you've it for an entire year! **FOR FREE!** But when we're talking about real applications it's normal to notice that 750hours per month isn't so much. And if your app is used for more hours, the more you pay for using a cloud service. That's the reason why big tech companies are still using their own data centers. And that's also the reason why you need to add a better user experience and a good code base to your app, to avoid problems with it!
**That's all for today guys, I'm writing an entire series of posts to teach everybody everything I know about AWS, and that's the Beginning!** | pokkan70 |
1,901,817 | useMemo Hook | useMemo is a hook that allows you to memoize expensive calculations to avoid unnecessary... | 0 | 2024-06-26T20:50:39 | https://dev.to/geetika_bajpai_a654bfd1e0/usememo-hook-ne8 | `useMemo` is a hook that allows you to memoize expensive calculations to avoid unnecessary re-computations on every render.
## Explanation of the Code
This React component, MemoTutorial, demonstrates how to use the useMemo hook to optimize performance by memoizing the result of a function that computes the longest name from a list of comments fetched from an API. Let's break down the code step by step.
<h4>1. Imports:</h4>
- axios is used to make HTTP requests.
- useEffect, useState, and useMemo are hooks from React.
<h4>2. Component Definition:</h4>
The MemoTutorial function is the React component.
<h4>3. State Variables:</h4>
- `data`: Holds the comments fetched from the API.
- `toggle`: A boolean used to trigger re-renders.
<h4>4. Fetching Data:</h4>
- `useEffect` is used to fetch data from the API when the component mounts.
- The empty dependency array ([]) ensures this effect runs only once.
<h4>5. Finding the Longest Name:</h4>
- This function iterates through the comments array to find and return the longest name.
<h4>6. Using useMemo:</h4>
- useMemo memoizes the result of findLongestName(data).
- The function findLongestName(data) is called only when toggle changes.
- If toggle remains unchanged, the previously computed result is returned without recomputing.
<h5>7. Rendering the Component:</h5>
- getLongestName is displayed in a div.
- A button toggles the toggle state.
- When toggle is true, "toggle" is displayed in an h1.
## Why Use useMemo?
<h4>1. Performance Optimization:</h4>
- It helps prevent expensive calculations from being performed on every render.
- In this example, findLongestName can be computationally expensive if the list of comments is large.
<h4>2. Dependencies:</h4>
- The result of the memoized function (findLongestName) is recalculated only when the specified dependencies ([toggle]) change.
- If the dependencies do not change, React returns the memoized value from the previous render.
<h4>3. Example Context:</h4>
- Here, useMemo ensures findLongestName(data) is only recalculated when toggle changes.
- Even if the component re-renders due to changes in other state or props, the memoized result is reused, avoiding redundant computations.
| geetika_bajpai_a654bfd1e0 | |
1,901,816 | 10 Slack emojis that developers should use | ALL of the companies that I've worked at so far used Slack. When I was entering the workforce, I... | 0 | 2024-06-26T20:50:24 | https://dev.to/gabrielpineda/10-slack-emojis-that-developers-should-use-387c | slack, productivity, development, softwaredevelopment |
ALL of the companies that I've worked at so far used Slack. When I was entering the workforce, I always dreaded communicating in Slack - it was too formal! But that was until my coworkers and myself added emojis to our Slack workspace. It was a game-changer in our communication and overall tone.
So I compiled a list of the most used emojis our Slack workspace has: [emoji-pack-for-devs](https://pullnotifier.com/tools/emoji-pack-for-devs)
And on this post, I'll be highlighting the 10 best ones.
1. Lgtm
Best for instantly approving Pull Requests with 100 files changed!
2. get-well-soon
Always nice to show your team you care!
3. smart
This is a well-known meme. Use it when a co-worker does something clever and witty
4. plus1
Best emoji to use when you agree with someone's message
5. catjam
Ultimate vibes
6. leo-toast
Great for celebrating small and big wins
7. kek
This emoji perfectly expresses how funny the msg was :D
8. merged
Used to indicate that your code has been merged and is on prod!
9. thisisfine
How we feel every day as developers..
10. thankyou
Always nice to show gratitude towards your teammates :)
That wraps it up!
You can view the full list here [emoji-pack-for-devs](https://pullnotifier.com/tools/emoji-pack-for-devs)
Also feel free to suggest new emojis and I'll try to add it in as soon as I can
| gabrielpineda |
1,900,673 | Micro Models - How to Build Using This Concept | In my last article (Developing for Scale and Quality with AI Micro-Models), I introduced the concept... | 0 | 2024-06-26T20:50:18 | https://dev.to/eletroswing/micro-models-how-to-build-using-this-concept-266n | ai, openai, opensource, chatgpt | In my last article (Developing for Scale and Quality with AI Micro-Models), I introduced the concept of micro-models for efficient AI model development. This time, we'll delve deeper into how to find micro-models, how to use them, and the benefits and trade-offs in terms of development time and efficiency. Let's get started!
## Defining the Task
In the previous article, we set a fictional goal to "censor people" and broke it down into multiple models and steps. Today, we'll follow a similar approach. Begin by taking the final objective of your model and breaking it down into smaller, manageable tasks. For this example, let's aim to censor people in video clips.
Here's the process we'll follow:
- Detect the person.
- Crop them.
- Apply a blur effect.
- Reinsert them back into the original clip.
It's evident that using an AI model specifically for detection and handling the rest with code is more efficient than employing a single 'big model' for the entire task.
## Searching for the Model
There are numerous sources to find models for development, such as GitHub, arXiv papers, and Hugging Face. I prefer Hugging Face due to its intuitive interface, but any of these platforms should suffice.
Once you've chosen your platform, start searching for models. On Hugging Face, there's a dedicated section for models. I navigated directly to this section and selected the type of model I needed: Object Detection. After that, it's just a matter of choosing a suitable model and learning how to use it.
## Applying the Model
Implementing the model was straightforward. I provided the video (or frames of a video) as input. The model output, which included a score and coordinates for cropping the content, was then fed into FFmpeg to handle the blurring of the video frame.
## Efficiency and Savings
This approach not only enhances development efficiency but also significantly reduces resource consumption. By leveraging small specialist networks instead of large models, we improve both the speed of development and the execution time of the task.
## Size of Micro-Models
There is a trade-off involved. For extremely long and complex tasks, we may need more micro-models, which require more RAM and memory for execution. However, this trade-off results in significantly better execution times and higher precision, as the models are specialized and optimized for their specific tasks.
In summary, micro-models offer a highly efficient way to tackle AI development tasks by breaking down complex problems into smaller, manageable units. This not only speeds up development but also ensures optimal use of resources.
## Example
Censor a person in an image
```python
import cv2
import torch
# load our model, in our case, yolo in version 5
model = torch.hub.load('ultralytics/yolov5', 'yolov5x', pretrained=True)
# the model return the boxes and a class for detection, so, we are setting the class to search in landmarks
person_class_id = 0
# function to apply blur
def blur_people(image, boxes):
for box in boxes:
x1, y1, x2, y2 = map(int, box)
image[y1:y2, x1:x2] = cv2.GaussianBlur(image[y1:y2, x1:x2], (51, 51), 50)
return image
def censor_people_in_image(input_image_path, output_image_path):
#load the image
image = cv2.imread(input_image_path)
if image is None:
raise FileNotFoundError(f"Não foi possível encontrar ou abrir a imagem {input_image_path}")
# detect
results = model(image)
boxes = results.xyxy[0].cpu().numpy() # obter as caixas de detecção
# filter all person
person_boxes = [box[:4] for box in boxes if int(box[5]) == person_class_id]
# apply blur
censored_image = blur_people(image, person_boxes)
cv2.imwrite(output_image_path, censored_image)
censor_people_in_image('input.jpg', 'output_image.jpg')
``` | eletroswing |
1,895,977 | sddfgb | A post by Aasuyadav1 | 0 | 2024-06-26T18:30:00 | https://dev.to/aasuyadav1/sddfgb-c47 | beginners, programming, df, javascript | aasuyadav1 | |
1,901,815 | 🤯PEPE holders realize over $18 million in gains in ten days, wipe out nearly 4% in value | 🤑 PEPE Down Nearly 4% Pepe (PEPE) is trading at $0.00001248, down almost 4% on Wednesday. The... | 0 | 2024-06-26T20:50:05 | https://dev.to/irmakork/pepe-holders-realize-over-18-million-in-gains-in-ten-days-wipe-out-nearly-4-in-value-52jn |
🤑 PEPE Down Nearly 4%
Pepe (PEPE) is trading at $0.00001248, down almost 4% on Wednesday. The frog-themed meme coin has seen consistent profit-taking by traders over the past ten days.
📉 Selling Pressure
Consistent profit-taking increases selling pressure, likely pushing prices lower. On-chain data shows a spike in PEPE deposits to centralized exchanges, adding to the selling pressure.
💸 Profits Realized
PEPE holders realized over $18 million in profits from June 15 to 25, according to Santiment. Despite this, the meme coin has maintained seven-day gains of 14.31%.
🐋 Whale Activity
Whale wallet "0x387" transferred 1.1 trillion PEPE tokens ($14.2 million) to Binance. Analysts suspect these tokens will be sold. The wallet still holds $3.78 million worth of PEPE and has an estimated total loss of $1.7 million.
📊 Supply on Exchanges
PEPE supply on exchanges climbed to over 171 trillion on June 27, increasing nearly 1% in ten days. It remains to be seen if the meme coin will extend its losses.
| irmakork | |
1,901,814 | 🔥Bitcoin price wobbles at $61K as US gov sends 4K BTC to Coinbase | 📈 Bitcoin Back at $61,000 Bitcoin price returned to $61,000 on June 26, as news emerged of an... | 0 | 2024-06-26T20:49:48 | https://dev.to/irmakork/bitcoin-price-wobbles-at-61k-as-us-gov-sends-4k-btc-to-coinbase-3b56 |
📈 Bitcoin Back at $61,000
Bitcoin price returned to $61,000 on June 26, as news emerged of an incoming BTC sale by the U.S. government.
⚠️ State Selling Risk
BTC price faced uncertainty as coins from a U.S. government wallet were sent to Coinbase. According to Arkham, the total involved was 3,940 BTC ($240 million).
💡 Market Reaction
Trader Skew noted that the market reaction was subdued, with some shorts opening and longs closing out. The U.S. government wallet still held over 213,500 BTC ($13 billion).
🔍 Whales Front-running
William Clemente of Reflexivity suggested that recent selling by Bitcoin whales may have anticipated these government moves, explaining crypto's relative weakness to stocks.
📊 Bitcoin ETFs Recover
Bitcoin ETFs saw inflows of $31 million on June 25, breaking a 7-day losing streak. Popular trader Daan Crypto Trades had predicted this positive result, noting strong TWAP purchasing at Coinbase.
| irmakork | |
1,901,813 | 💥Bitcoin price must end June above $56.5K to defend uptrend — Analysis | ⚠️ Potential BTC Volatility A deluge of potential BTC price volatility triggers is due this week,... | 0 | 2024-06-26T20:49:30 | https://dev.to/irmakork/bitcoin-price-must-end-june-above-565k-to-defend-uptrend-analysis-mdb |
⚠️ Potential BTC Volatility
A deluge of potential BTC price volatility triggers is due this week, with participants eyeing the crucial support zone.
📉 Key Support Level
Bitcoin risks losing its uptrend if it ends June below $56,500, warns trading resource Material Indicators. BTC hit its lowest levels since early May this week, making May lows a critical level.
🔥 Market Pressure
Market pressure is expected to increase as weekly, monthly, and quarterly closes all occur on the same day. Bears gaining the upper hand would make $56,500 a vital defense level for buyers.
📊 Order Book Liquidity
Material Indicators' Keith Alan warned of potential "spoofing" as order book data from Binance showed strengthening bid liquidity between the current spot price and $55,000.
📈 RSI Rebound
Bitcoin traders are betting on a rebound, with the BTC/USD pair experiencing its most “overbought” conditions since August 2023. RSI levels acting as bottom signals leave room for growth if Bitcoin and ETH lead the way.
| irmakork | |
1,901,812 | 👀Here's How Bitcoin And Altcoins Will Behave 'Until Fed Cuts Rates,' According To Veteran Crypto Analyst | 📊 Bitcoin Dominance to Increase Crypto analyst Benjamin Cowen predicts Bitcoin’s dominance will rise... | 0 | 2024-06-26T20:49:13 | https://dev.to/irmakork/heres-how-bitcoin-and-altcoins-will-behave-until-fed-cuts-rates-according-to-veteran-crypto-analyst-18lb |
📊 Bitcoin Dominance to Increase
Crypto analyst Benjamin Cowen predicts Bitcoin’s dominance will rise further despite recent market fluctuations.
📉 Recent Speculation
Cowen addressed speculation that Bitcoin dominance has peaked after a sharper BTC decline compared to altcoins recently. He believes Bitcoin dominance will continue to rise, based on historical patterns and current conditions.
🔍 Altcoin/BTC Pairs
Cowen notes Altcoin/BTC pairs are oscillators, currently above historical lows. He highlights that recent rallies from 0.36 to 0.40 do not signify an alt season, drawing parallels to a similar pattern in 2019.
📅 Cyclical Patterns
Significant altcoin rallies historically occur in post-halving years, potentially indicating 2025 for the next rally rather than 2024. Cowen’s analysis challenges the narrative that altcoins are poised for a breakout soon.
💡 Strategic Implications
Cowen advises that Altcoin/BTC pairs will decline until the Federal Reserve cuts rates or resumes quantitative easing. He cautions against premature anticipation, suggesting Bitcoin dominance will rise more than expected.
🚀 Future of Digital Assets Event
The influence of Bitcoin as an institutional asset class will be explored at Benzinga’s Future of Digital Assets event on Nov. 19.
| irmakork | |
1,901,811 | 💥Here’s when Ethereum will reach $6,000, according to analysts | 🚀 Ethereum Up Nearly 50% in 2024 Ethereum (ETH) has surged nearly 50% since January 1, surpassing... | 0 | 2024-06-26T20:48:53 | https://dev.to/irmakork/heres-when-ethereum-will-reach-6000-according-to-analysts-429a |
🚀 Ethereum Up Nearly 50% in 2024
Ethereum (ETH) has surged nearly 50% since January 1, surpassing $4,000 in March, but has faced an 11% decline over the past 30 days.
📈 Optimistic Forecast
Crypto analyst degentrading predicts Ethereum will reach $6,000 by September 2024, despite skepticism from Andrew Kang of Mechanism Capital. Kang forecasts a downtrend for the ETHBTC ratio.
💡 Bullish Sentiment
Degentrading's optimism is driven by a $5 billion increase in CME open interest and Ethereum's relative illiquidity compared to Bitcoin. An influx of $3-4 billion could significantly boost Ethereum’s price. The upcoming launch of Ethereum ETFs and the potential conversion of Grayscale’s Ethereum Trust (ETHE) into an ETF also support a bullish outlook.
🔍 Skeptical View
Andrew Kang highlights challenges such as the decline of prime brokers like Genesis and the involvement of large funds engaging in basis trades. These factors could limit the anticipated capital inflows.
⚖️ Market at a Pivotal Point
At press time, Ethereum is trading at $3,356.09, down 0.86% in the last 24 hours. The market faces contrasting views from analysts, with degentrading highlighting potential inflows and positive sentiment, while Kang underscores challenges and uncertainties.
📊 Investor Considerations
Investors should weigh these perspectives and monitor market developments closely as Ethereum navigates the coming months.
| irmakork | |
1,432,159 | How to Save TikTok Videos without Watermark or Logo | For many people, after liking a video on TikTok, they want to save it to watch it again later.... | 0 | 2023-04-11T01:18:17 | https://dev.to/snaptikappme/how-to-download-tiktok-video-h5k | For many people, after liking a video on TikTok, they want to save it to watch it again later. However, when saving videos on the TikTok app, the video usually comes with a watermark, TikTok logo, and the ID of the poster (username). This can reduce your viewing experience. Therefore, to download TikTok videos without a watermark, logo, or ID, you need to use a third-party video downloader app.
Here, we introduce a TikTok video downloader app called SnapTik. This app has been used and highly rated by many users. With SnapTik, you can easily download TikTok videos without logos or IDs, while still maintaining the quality of the original video. You just need to copy the link of the TikTok video and paste it into SnapTik, then select the format and video quality you want to download.
## 1. Guide to saving TikTok videos without watermark in 3 steps
- Step 1: Copy the link of the video you want to download
Open the TikTok app > Find the video you want to download > Click on the share button (arrow icon) located in the lower right corner of the TikTok video and select "Copy link".
- Step 2: Access the **[SnapTik](https://snaptikapp.me/)** website and paste the link
Access the SnapTik website, address "Snaptikapp.me", through a browser like Safari or Chrome. Paste the copied link into the blank box on the website.
- Step 3: Click on the "Download" button to save the video
Then, click on the "Download" button at the bottom of the website. If four green download buttons appear, you can choose "No watermark.mp4" at the top of the page to download the original video without the TikTok logo, or choose a different format at the bottom of the page.
## 2. Other TikTok video downloaders without logo & ID
Here are two other TikTok video downloaders without logos or watermarks that you can try:
### F-Tik TikTok Video Downloader Without Logo, Watermark, Free
If you are looking for the best TikTok video downloader without a watermark, then FTIK is a perfect choice for you. FTIK is a product of FPT Express, and completely free, unlimited for users. To download TikTok videos without logos or watermarks using FTIK, you just need to copy the TikTok video link, paste it into the tool and press the download button. Then, follow these steps:
- Step 1: Open TikTok and select your favorite video to download, select Share and then Copy link
- Step 2: Open the browser, enter the link **[FTIK - TikTok Downloader](https://tools.fpttelecom.com/tiktok-downloader/)** and paste the TikTok video link you copied earlier into the required field
- Step 3: Click Download Now and wait a moment
- Step 4: When the screen switches to a new interface, scroll down and select Without Watermark -> select Download video. This is a simple and effective way to save TikTok videos without a logo to your device.
### Use SSSTikTok to save TikTok videos without watermark
If you don't use an iPhone, you can choose the SSSTikTok app to save TikTok videos without a watermark. Follow these steps:
- Step 1: Access the link ssstik[.]io
- Step 2: Open TikTok and select the video you want to save, then press Copy link
- Step 3: Go back to the SSSTikTok page, paste the link into the required field
- Step 4: Click on the Download button and remember to select No logo
This is a simple way to download TikTok videos without logos that you can try. In addition, there are many other ways to save TikTok videos without logos that you can try.
## 3. Notes when downloading and using TikTok videos
### Use only for personal purposes and do not "Reup" illegally
After downloading, save the TikTok video to your own folder and enjoy it. However, it should be noted that copying or reusing content without the owner's permission may violate copyright and cause serious consequences. Moreover, TikTok has the right to delete, suspend or delete your account if it detects copyright infringement.
### Avoid downloading copyrighted videos
Remember that downloading copyrighted TikTok videos is completely illegal, even if you only want to download them for personal enjoyment. So, avoid downloading copyrighted videos on TikTok.
This article introduces how to save TikTok videos without watermark or logo by using third-party video downloader apps such as SnapTik App, and provides detailed instructions in 3 steps. However, it should be noted to use only for personal purposes and not to re-upload without permission, as well as avoid downloading copyrighted videos on TikTok.
| snaptikappme | |
1,901,810 | 🚀Bitcoin price analysis | Bitcoin bulls are striving to keep the price above the crucial support level of $56,552. 🐻 Bears... | 0 | 2024-06-26T20:48:32 | https://dev.to/irmakork/bitcoin-price-analysis-1f4j |
Bitcoin bulls are striving to keep the price above the crucial support level of $56,552.
🐻 Bears Push Below $60,000
On June 24, bears pushed the price below $60,000, but the long tail on the candlestick indicates strong buying at lower levels. Expect bulls to stay active in the $60,000 to $56,552 zone for the next few days. If they fail to defend this support, the BTC/USDT pair could plummet to $50,000.
📈 Key Resistance Level
The 20-day exponential moving average (EMA) at $64,883 is the critical resistance level to watch on the upside. A break and close above this level will suggest the bears are losing control, and the pair may then rally towards $70,000.
| irmakork | |
1,901,809 | 🔥Ether price analysis | 📉 Ether Slips Toward $3,000 Support Ether (ETH) has been gradually declining towards the key support... | 0 | 2024-06-26T20:48:17 | https://dev.to/irmakork/ether-price-analysis-ndh |
📉 Ether Slips Toward $3,000 Support
Ether (ETH) has been gradually declining towards the key support level at $3,000. Bulls bought the dip to $3,240 on June 24 but are struggling to push the price to the 20-day EMA ($3,506).
🐻 Bears Eye $3,200
If the price turns down from the current level, bears will attempt to sink it below $3,200. If successful, the ETH/USDT pair could plummet to the psychological level of $3,000. Buyers are expected to fiercely defend the $3,000 to $2,850 zone.
📈 Upside Resistance
On the upside, bulls need to push and sustain the price above the 20-day EMA to signal a reduction in selling pressure. This move would clear the path for a potential rally to $3,730.
| irmakork | |
1,901,808 | 🚀Solana price analysis | 📈 Solana Recovers to $137 Solana (SOL) rebounded sharply from $122 on June 24 and re-entered the... | 0 | 2024-06-26T20:48:00 | https://dev.to/irmakork/solana-price-analysis-38c0 |
📈 Solana Recovers to $137
Solana (SOL) rebounded sharply from $122 on June 24 and re-entered the descending channel pattern on June 25.
🐻 Bears Target 20-day EMA
Bears will try to halt the relief rally at the 20-day EMA ($143). If the price turns down sharply from this level, the SOL/USDT pair could tumble to crucial support at $116. Bulls are expected to defend this level fiercely, as a break below it could lead to a drop to $100.
📊 Potential Upside
If bulls push the price above the 20-day EMA, it will indicate reducing selling pressure. The pair may then climb to the channel’s resistance line. A break above the channel would shift the advantage in favor of the bulls.
| irmakork | |
1,901,807 | 🚀XRP price analysis | 📉 XRP Bounces to $0.47 XRP bounced off the $0.46 support on June 24, but bulls are struggling to... | 0 | 2024-06-26T20:47:43 | https://dev.to/irmakork/xrp-price-analysis-4e0d |
📉 XRP Bounces to $0.47
XRP bounced off the $0.46 support on June 24, but bulls are struggling to extend the recovery.
🐻 Bears in Control
Both moving averages are sloping down, and the relative strength index (RSI) is in negative territory, indicating bears are in control. Sellers will again try to push the price below $0.46. If successful, the XRP/USDT pair could slump to the next major support at $0.41.
🛡️ Defending Key Support
Buyers are expected to vigorously defend the $0.41 to $0.46 zone, as a break below it could sink the pair to $0.35. The first sign of strength will be a break and close above the 20-day EMA, potentially leading to a rally to $0.52.
| irmakork | |
1,901,806 | 💥Dogecoin price analysis | 🐕 Dogecoin Rebounds to $0.12 Dogecoin (DOGE) broke and closed below the $0.12 support on June 24, but... | 0 | 2024-06-26T20:47:25 | https://dev.to/irmakork/dogecoin-price-analysis-1e4f |
🐕 Dogecoin Rebounds to $0.12
Dogecoin (DOGE) broke and closed below the $0.12 support on June 24, but bulls started a recovery and pushed the price back above this level on June 25.
📈 Key Resistance Level
Bulls need to propel the price above the 20-day EMA ($0.13) to signal a robust recovery. If successful, the DOGE/USDT pair could rise to the 50-day simple moving average (SMA) at $0.15, suggesting that the range-bound action between $0.12 and $0.18 may continue for a few more days.
🐻 Bearish Scenario
If the price turns down sharply and breaks below $0.12, it will indicate that bears are in control. This could start a downward move toward $0.10, where bulls will again attempt to halt the decline.
| irmakork | |
1,901,796 | Using AI with Structured Prompts: A Guide to Enhanced Productivity | In the rapidly evolving landscape of artificial intelligence, the way we interact with AI systems is... | 0 | 2024-06-26T20:47:02 | https://dev.to/oussama_errafif/using-ai-with-structured-prompts-a-guide-to-enhanced-productivity-f5o | ai, promptengineering, chatgpt, machinelearning | In the rapidly evolving landscape of artificial intelligence, the way we interact with AI systems is becoming increasingly sophisticated. To maximize the potential of AI tools, it’s crucial to use well-structured prompts. Structured prompts not only help in obtaining precise and actionable outputs but also streamline the communication process with AI systems. Here, we explore eight effective prompt structures that can enhance your interaction with AI: TREF, SCET, PECRA, GRADE, ROSES, STAR, SOAR, and SMART.
## TREF (Task, Requirement, Expectation, Format)
**Overview**:
TREF helps in clearly defining the task, setting requirements, outlining expectations, and specifying the format for AI outputs.
**Example**:
- **Task**: Write a report
- **Requirement**: Minimum 2000 words
- **Expectation**: Cover the latest market trends in renewable energy
- **Format**: Use APA style for citations and include a table of contents
**Usage with AI**:
When using TREF, clearly define the task you want the AI to perform. Specify any requirements, such as word count or specific details to include. Outline your expectations for the output, and finally, mention the format in which you need the information. This structured approach ensures the AI generates a detailed and properly formatted report.
## SCET (Situation, Complication, Expectation, Task)
**Overview**:
SCET is ideal for problem-solving scenarios by providing context and focusing on delivering targeted solutions.
**Example**:
- **Situation**: The sales team is facing a decline in customer engagement
- **Complication**: Recent changes in market dynamics and increased competition
- **Expectation**: Identify key issues and propose solutions
- **Task**: Prepare a detailed analysis report
**Usage with AI**:
SCET prompts are ideal for problem-solving scenarios. By describing the current situation and any complications, you provide context for the AI. Setting clear expectations and tasks helps the AI focus on delivering targeted solutions and analyses.
## PECRA (Purpose, Expectation, Context, Request, Action)
**Overview**:
PECRA is effective for making specific requests by outlining the purpose, expectations, context, and specific actions required.
**Example**:
- **Purpose**: Improve team collaboration
- **Expectation**: Increase project efficiency and reduce miscommunication
- **Context**: Current collaboration tools are outdated
- **Request**: Recommend new collaboration software
- **Action**: Evaluate top 3 tools and provide a comparative analysis
**Usage with AI**:
PECRA is effective for making specific requests. By outlining the purpose, expectations, context, and specific requests, you guide the AI to perform thorough research and provide actionable insights or recommendations.
## GRADE (Goal, Request, Action, Detail, Examples)
**Overview**:
GRADE prompts are useful for setting clear goals and providing detailed instructions to ensure comprehensive responses.
**Example**:
- **Goal**: Enhance customer satisfaction
- **Request**: Implement a new feedback system
- **Action**: Research and select suitable software
- **Detail**: Ensure it integrates with our CRM
- **Examples**: Look into SurveyMonkey, Typeform, and Google Forms
**Usage with AI**:
GRADE prompts are useful for setting clear goals and providing detailed instructions. By specifying the goal, making a request, detailing the required actions, and giving examples, you ensure the AI’s response is comprehensive and aligned with your objectives.
## ROSES (Role, Objective, Scenario, Expected Solution, Steps)
**Overview**:
ROSES is beneficial for project management and planning by defining roles, objectives, scenarios, and detailing expected solutions and steps.
**Example**:
- **Role**: Project Manager
- **Objective**: Launch new product successfully
- **Scenario**: Tight deadline with limited resources
- **Expected Solution**: Efficient resource allocation and time management
- **Steps**: Outline tasks, assign responsibilities, set milestones
**Usage with AI**:
ROSES is beneficial for project management and planning. By defining roles, objectives, and scenarios, and detailing expected solutions and steps, you enable the AI to generate a structured plan that aligns with project requirements.
## STAR (Situation, Task, Action, Result)
**Overview**:
STAR prompts are excellent for performance reviews and storytelling by outlining situations, tasks, actions taken, and results achieved.
**Example**:
- **Situation**: Declining website traffic
- **Task**: Improve SEO
- **Action**: Conduct keyword research and optimize content
- **Result**: Increased traffic by 30% over three months
**Usage with AI**:
STAR prompts are excellent for performance reviews and storytelling. By outlining the situation, task, actions taken, and results achieved, you help the AI provide detailed and relevant insights or summaries.
## SOAR (Situation, Objective, Action, Result)
**Overview**:
SOAR focuses more on objectives, making it effective for strategic planning and evaluations.
**Example**:
- **Situation**: High employee turnover
- **Objective**: Increase retention rate
- **Action**: Implement employee engagement programs
- **Result**: Reduced turnover by 20% in six months
**Usage with AI**:
SOAR is similar to STAR but focuses more on objectives. This structure is effective for strategic planning and evaluations, guiding the AI to deliver focused results based on clear objectives.
## SMART (Specific, Measurable, Achievable, Relevant, Time-bound)
**Overview**:
SMART is a well-known framework for setting clear and achievable goals by defining specific, measurable, achievable, relevant, and time-bound objectives.
**Example**:
- **Specific**: Increase email newsletter subscribers
- **Measurable**: Add 500 new subscribers
- **Achievable**: Through targeted marketing campaigns
- **Relevant**: Aligns with overall marketing strategy
- **Time-bound**: Within the next three months
**Usage with AI**:
SMART is a well-known framework for setting clear and achievable goals. By defining specific, measurable, achievable, relevant, and time-bound objectives, you ensure the AI provides practical and goal-oriented responses.
## Conclusion
Using structured prompts like TREF, SCET, PECRA, GRADE, ROSES, STAR, SOAR, and SMART can significantly enhance the effectiveness of your interactions with AI. These frameworks provide clear guidelines and expectations, ensuring that the AI delivers precise and actionable outputs. Whether you’re managing a project, conducting research, or setting strategic goals, leveraging these prompt structures will help you harness the full potential of AI technology.
| oussama_errafif |
1,901,805 | 💵Shiba Inu price analysis | 📉 Shiba Inu (SHIB) Struggles Below $0.000017 Shiba Inu (SHIB) plunged below the 78.6% Fibonacci... | 0 | 2024-06-26T20:47:01 | https://dev.to/irmakork/shiba-inu-price-analysis-3m4m |
📉 Shiba Inu (SHIB) Struggles Below $0.000017
Shiba Inu (SHIB) plunged below the 78.6% Fibonacci retracement level of $0.000017 on June 24, firmly placing bears in control.
🐻 Bearish Momentum
Despite an attempted recovery on June 25, bullish momentum remains weak. Bears are poised to push the price below $0.000017 again. A successful breach could lead SHIB/USDT to decline towards $0.000014 and potentially $0.000010.
📈 Potential Recovery
For buyers to regain control, they must quickly propel the price back above the breakdown level of $0.000020. This move could pave the way for a rally towards the 50-day SMA ($0.000023).
| irmakork | |
1,901,804 | 🚀Avalanche price analysis | 📉 Avalanche (AVAX) Faces Downtrend Avalanche (AVAX) resumed its downtrend after breaking below the... | 0 | 2024-06-26T20:46:42 | https://dev.to/irmakork/avalanche-price-analysis-4eff |
📉 Avalanche (AVAX) Faces Downtrend
Avalanche (AVAX) resumed its downtrend after breaking below the strong support at $29 on June 17.
🐻 Bearish Indicators
Downward sloping moving averages and an RSI near oversold territory indicate bears are currently dominant. Bulls are attempting a relief rally, likely encountering resistance at the 20-day EMA ($28.76). If the price reverses from this level, bears may target a drop towards $20.
📈 Potential Reversal
This bearish outlook could change if bulls manage to push the price above $29. A move above this level could see AVAX/USDT rise towards $33, signaling rejection of the breakdown below $29.
| irmakork | |
1,901,803 | 🤯$6.6B in Bitcoin Options and $3.4B in Ethereum Options Expiring Soon, Will Prices Hit Max Pain Point? | 📊 Bitcoin and Ethereum Options Expiry Insight This week, crypto traders are closely monitoring the... | 0 | 2024-06-26T20:46:25 | https://dev.to/irmakork/66b-in-bitcoin-options-and-34b-in-ethereum-options-expiring-soon-will-prices-hit-max-pain-point-4hoi |
📊 Bitcoin and Ethereum Options Expiry Insight
This week, crypto traders are closely monitoring the upcoming options expiry for Bitcoin and Ethereum scheduled for Friday, June 28. A substantial $6.6 billion in Bitcoin options and $3.5 billion in Ethereum options are set to expire, heightening market volatility.
🔍 Bitcoin Options Data
Bitcoin options expiring on June 28 amount to $6.6 billion, with a bullish put/call ratio of 0.47. Deribit data shows current open interest at $108,239.60, consisting of 71,651.40 call options and 36,588.20 put options. Bitcoin's max pain point stands at $57,000, with recent price movements approaching this level after fluctuating between $58,000 and above $61,000 earlier this week.
🌀 Ethereum Options Overview
Ethereum options expiring the same day total $3.54 billion, with a put/call ratio of 0.58. Open interest is at 1,049,020.00, comprising 662,453.00 call options and 662,453.00 put options. Ethereum's max pain point is at $3,100, contrasting with its current trading price of $3,382 and a 4.7% weekly decline.
📉 Max Pain Dynamics
Max pain points signify the level where most options expire worthless, influencing market movements as the expiry nears. Traders are closely observing whether Bitcoin and Ethereum prices align with these critical levels.
📈 BTC and ETH Developments
Bitcoin is showing signs of bottom formation post a 15% correction from its peak, with reduced leverage and declining open interest and funding rates ahead of the expiry. Meanwhile, Ethereum anticipates the launch of spot ETFs next week, enhancing investor sentiment with firms like VanEck preparing for this milestone and offering zero trading fees through late 2025.
| irmakork | |
1,901,802 | 🤔 When Is Bitcoin (BTC) Price Likely To Reach $100,000? | 📉 Bitcoin and Ethereum in Recent Decline Recent weeks have seen Bitcoin and Ethereum experience... | 0 | 2024-06-26T20:46:04 | https://dev.to/irmakork/when-is-bitcoin-btc-price-likely-to-reach-100000-52h8 |
📉 Bitcoin and Ethereum in Recent Decline
Recent weeks have seen Bitcoin and Ethereum experience significant declines, sparking concerns among investors. Despite a bullish start to the year, both leading cryptocurrencies have faced considerable selling pressure in June. This has raised questions about whether the current correction presents a buying opportunity or marks the beginning of a more prolonged downturn.
🔮 Long-Term Outlook for Bitcoin and Ethereum
Looking ahead to 2024, the long-term outlook for Bitcoin and Ethereum remains uncertain but pivotal. The recent Bitcoin halving in April 2024 has altered supply dynamics, potentially influencing future price trajectories. However, predicting Bitcoin's price in 5 years is inherently challenging.
The approval of spot Bitcoin ETFs in the US has been a significant catalyst, initially propelling Bitcoin's price above $70,000 in Q1. Continued institutional adoption, facilitated by easier market entry, could sustain a bullish trend. Yet, regulatory scrutiny and macroeconomic factors like Federal Reserve policies on interest rates may pose challenges.
📈 Bitcoin's Near-Term Prospects
Despite recent corrections bringing Bitcoin to around $60,000 in June, analysts foresee a potential bull run pushing Bitcoin above $100,000 in 2024. Predictions range widely, with some suggesting a $1 million valuation in 5 years, while others anticipate more moderate growth.
🔄 Potential Rebound in July
Bitcoin bulls recently defended the $60,000 support level, pushing the price back above $61,000 ahead of the US session. With the Relative Strength Index (RSI) recovering from oversold levels, traders are increasing long positions in anticipation of further gains.
| irmakork | |
1,901,801 | 💥Dogwifhat price breakout signals potential rally above $2.1 resistance | 📈 Dogwifhat (WIF) Breaks Out and Shows Potential Dogwifhat (WIF) price surged above $2 on Wednesday... | 0 | 2024-06-26T20:45:45 | https://dev.to/irmakork/dogwifhat-price-breakout-signals-potential-rally-above-21-resistance-4dlg |
📈 Dogwifhat (WIF) Breaks Out and Shows Potential
Dogwifhat (WIF) price surged above $2 on Wednesday after breaking out from a descending trendline on Tuesday. On-chain data reveals that the largest whale has accumulated 2.3 million tokens valued at $4.67 million, signaling potential for an upcoming rally.
🐋 Whale Accumulation
According to Lookonchain, the largest WIF holder acquired 2.3 million tokens worth $4.67 million, adding to their existing holdings of 23.39 million WIF tokens valued at $49.6 million, with a total profit of $83 million. Additionally, the whale spent 86,738.1 Solana tokens, worth $8.65 million, in a single trade to purchase 17.22 million WIF tokens.
📉 Technical Outlook
The breakout above the descending trendline, drawn from multiple swing highs between June 5 and June 25, sets a bullish tone for WIF. If the price sustains above the $2.10 daily resistance level and finds support at the trendline, it could potentially rally by 25% to retest its recent high of $2.64 from June 17.
📊 Indicators and Momentum
The Relative Strength Index (RSI) on the daily chart is rebounding from oversold levels and aims to cross above the neutral 50 mark, indicating increasing bullish momentum. Meanwhile, the Awesome Oscillator (AO) remains below the zero line, suggesting potential for further upward movement. Sustained positions above these key levels would bolster the ongoing recovery rally.
⚠️ Risk Factors
Despite bullish indicators, a daily candlestick close below $1.54 could invalidate the bullish scenario by forming a lower low on the daily chart. This scenario might lead to a 35% decline, revisiting the March 5 low at $1.
The outlook for Dogwifhat (WIF) appears promising with strong on-chain accumulation and favorable technical signals, but investors should monitor key support and resistance levels closely for confirmation of further upside potential.
| irmakork | |
1,901,800 | 💥Bears stall Notcoin’s rally: Is $0.0101 next for NOT? | 📈 Notcoin (NOT) has recently shown gains despite Bitcoin (BTC) struggling to hold above $61,000. 📅... | 0 | 2024-06-26T20:45:18 | https://dev.to/irmakork/bears-stall-notcoins-rally-is-00101-next-for-not-55p9 |
📈 Notcoin (NOT) has recently shown gains despite Bitcoin (BTC) struggling to hold above $61,000.
📅 On June 16th, AMBCrypto noted bullish social sentiment and short-term price optimism for Notcoin.
📉 However, recent price action has reinforced a bearish trend, with a brief upturn observed in the past 24 hours likely to be short-lived.
📈 Resistance at a trendline could hinder bullish momentum:
🟠 A trendline resistance drawn from early June highs historically acts as a barrier during bullish phases and is expected to play a similar role now.
💲 Following a late May rally, Fibonacci retracement levels suggest $0.0171 could serve as resistance, potentially leading to movements towards $0.0101 or the 78.6% retracement level.
📊 Futures market data lacks strong bullish signals:
📉 Data indicates continued bearish sentiment on the price chart, with spot CVD showing slight recent rebounds but an overall downward trend.
📈 Open Interest has seen a modest increase, yet without corresponding demand in spot markets, bullish speculators hoping for recovery may face disappointment.
💰 The Funding Rate remains positive but not exceptionally high, hovering near +0.021, with typical levels around +0.025 since early June.
| irmakork | |
1,901,798 | 🚀BONK gains 17%: Is this the beginning of a bull run? | 🚀 Bonk (BONK) saw a significant surge on June 25th, with its price rising by 17% in the past 24 hours... | 0 | 2024-06-26T20:44:59 | https://dev.to/irmakork/bonk-gains-17-is-this-the-beginning-of-a-bull-run-31g |
🚀 Bonk (BONK) saw a significant surge on June 25th, with its price rising by 17% in the past 24 hours due to heightened trading activity.
☁️ Currently, BONK is trading above the Ichimoku Cloud, indicating a strong bullish trend supported by the cloud. As long as the price remains above the cloud, the bullish momentum is likely to continue.
🐂 The surge in trading volume accompanying the price increase confirms the strength of the bulls in the market.
📊 With an RSI around 44.56, BONK shows balanced conditions—not overbought or oversold—suggesting potential for further upward movement without immediate concerns of a pullback.
📈 Social volume and dominance for BONK have also spiked, indicating increased attention and speculative trading interest.
📉 BONK’s CM Ultimate MACD, reflecting movements around the zero line, highlights active market conditions with frequent bullish and bearish crossovers, providing multiple trading signals.
📉 Despite short-term bullish indicators, BONK remains below its 200-day moving average (MA), suggesting bearish sentiment over the longer term. Resistance is noted around the 0.000002768 level.
⚖️ Support levels are being monitored around recent lows, with attention on the Stochastic indicator for potential buy signals as it moves towards overbought territory.
💡 BONK’s all-time high was $0.00004547, reached in March 2024, currently trading approximately 49.48% below this peak.
| irmakork | |
1,901,797 | 💥FLOKI: These historical trends point to a 100% price rise | 📈 Floki (FLOKI) has surged by 10.12% over the past 24 hours, trading at $0.00017, indicating... | 0 | 2024-06-26T20:44:27 | https://dev.to/irmakork/floki-these-historical-trends-point-to-a-100-price-rise-451o |
📈 Floki (FLOKI) has surged by 10.12% over the past 24 hours, trading at $0.00017, indicating potential for further gains.
📊 The MVRV ratio, which compares market value to realized value, currently stands at -36.34% for FLOKI. This suggests that holders bought at a higher average price recently, making selling at current levels a loss-making proposition.
💡 Historically, when FLOKI's MVRV ratio was similarly low, significant price increases followed. For instance, in February, with an MVRV of -18.73%, FLOKI surged over 300% within a week.
🚀 Given these historical patterns, if FLOKI follows a similar trajectory, a potential 100% increase to $0.00034 within a month could be feasible, barring significant market corrections.
⚙️ Analyzing the IOMAP reveals that significant support lies around $0.00016, where 1,140 addresses hold nearly 36 billion FLOKI. This support level could prevent sharp price declines.
🔍 Looking forward, if buying pressure persists, FLOKI could initially target $0.00019. Further bullish momentum could potentially propel it towards its previous all-time high.
| irmakork | |
1,901,794 | 💥Can AVAX hold the $25 support? Insights from key indicators | 📉 Avalanche (AVAX) has breached its January low at $27.3 and is currently testing critical support at... | 0 | 2024-06-26T20:44:10 | https://dev.to/irmakork/can-avax-hold-the-25-support-insights-from-key-indicators-5hc7 |
📉 Avalanche (AVAX) has breached its January low at $27.3 and is currently testing critical support at $25.5 amid a volatile cryptocurrency market.
📉 Since May 22nd, AVAX has declined by over 40%, with a recent 3% surge sparking concerns of either a deeper collapse or a potential reversal. As of now, AVAX is trading at $25.21.
📊 Technical indicators such as the stochastic RSI (4.96) suggest an oversold condition, hinting at a possible rebound from current levels. The MACD also indicates weakening bearish pressure.
📈 IntoTheBlock's holder data shows a balanced sentiment, with 48% of holders in profit and 52% in loss. Significant whale activity, accounting for 71% concentration, highlights potential price impact.
🔄 AVAX's strong correlation (0.86) with Bitcoin suggests its price trajectory may closely follow Bitcoin's movements in the near term.
📈 Analysis of social volume and whale activity by Santiment indicates heightened trader interest, supported by stable coin holdings by major holders, potentially biasing AVAX towards a bullish outlook.
⚖️ Coinglass long/short data reflects fluctuating positions, currently favoring short positions, signaling short-term market control by bears.
🔮 Looking ahead, AVAX faces critical support at $24.49. A breakdown could lead to further declines, while holding above this level could pave the way for a rebound towards resistance at $29.22.
| irmakork | |
1,901,792 | ChatGPT: Más que un Asistente, un Confidente en la Era Digital | ¿A qué se debe el éxito de ChatGPT? 🚀 Muchos suponen que se trata de la mayor innovación y... | 0 | 2024-06-26T20:39:59 | https://dev.to/jzchannel03/chatgpt-mas-que-un-asistente-un-confidente-en-la-era-digital-555 | chatgpt, ai, productivity, programming | ### ¿A qué se debe el éxito de ChatGPT? 🚀
Muchos suponen que se trata de la mayor innovación y revolución traída al mercado de la IA, la cual se sentía un poco estancada, y eso trajo consigo su gran boom. _¿Pero, hay algo más que eso?_ _¿No huele a… algo más…? 🤔_
¡Es momento de arriar las velas! ¡Vamos más allá en el área laboral y educativa! ⛵️
_Estudiantes, profesionales, empresarios, emprendedores, todos, absolutamente todos, necesitamos ayuda. Es natural, es ser humano; siempre necesitamos una mano, aunque en ocasiones sea bastante difícil pedir ayuda. 🤝_
Puedo asegurar que un gran porcentaje de las personas que lean esto van a coincidir en que pedir favores de ayuda, a quien sea, es una de las cosas más difíciles. Sea a un profesor, un jefe, un compañero, sea quien sea, es incómodo pedirle ayudas, ya que no sabemos la reacción de quien nos brindará la respuesta a nuestra duda.
A veces, hasta a quienes ya recurrentemente nos ayudan. Un día cualquiera, sea por la cuestión que sea, nos rechazan la solicitud y puede que hasta nos hable de una manera inadecuada e hieran ese corazoncito que cargamos. 💔
La pregunta es, _¿por qué nos es tan difícil pedir ayuda?_ Más allá de que tengamos miedo a la reacción de a quien le pedimos, **hay algo más a mencionar.**
El humano desde sus inicios se dedicó a sobrevivir solo, y aunque luego se formaron comunidades y las personas se ayudaban en ciertas cosas, siempre había situaciones en las que cada uno debía resolver por su parte.
Hoy en día sigue siendo así; queremos tener **logros propios** que sean separados de nuestros equipos o grupos en los que estamos, queremos destacar con cosas nuestras, queremos que nuestro nombre aparezca al lado de un descubrimiento o proyecto solo. _Mira cómo grandes descubrimientos científicos de la historia son más los que tienen un único nombre que la unión de varios de ellos. 🌟_
Y en todo caso de que recibamos ayuda de/en algo, queremos evitar que se conozca esa realidad. Fuimos nosotros y listo, **¡nadie más!**
Entonces, _¿adivina quién es que mejor encaja en esta parte de ayudar sin formar parte de nuestro proyecto?_ Sip, así es, es aquí donde ChatGPT o cualquier chatbot de tu preferencia ha golpeado más fuerte.
Para nosotros, ChatGPT es una máquina. Lo que hablamos y consultamos es entre ambos, las ayudas que nos da podemos apropiarlas y decir que fueron elaboradas por nosotros, es un copiloto que no busca que su nombre se mencione dentro de tus logros, es tu aliado perfecto para manejar cualquier tema, es la persona que no es persona que más sabe de ese tema, **¡es simplemente increíble!** 🤖
Es aquí donde cualquier profesional o estudiante de cualquier área se siente confiado de conversar con su amigo el Chapi (_como le digo yo de cariño_😁), y preguntar sus dudas, conversar sobre temas específicos o quizás pedirle que le haga toda la funcionalidad o tarea completa que necesita (ah vale, eso no iba 😂).
Nos sentimos seguros haciéndolo, no nos juzga (hasta puede motivarnos si así lo pedimos), no demostramos falta de dominio en algo, y lo sentimos humano. No son cientos de páginas lanzadas por un buscador intentando coincidir, sino que es una respuesta concreta y directa al grano, aunque a veces inventada y que toca validar si está correcta, pero nada fuera de nuestras manos. **Es aquí donde está la magia. ✨**
El hecho de que estos modelos sean conversacionales es lo que los hace interesantes, que las peticiones se sientan igual que pedir a otra persona, con tanta interacción, con tantas funcionalidades, es muy agradable que hasta en tus temas privados pueda ayudarte, donde sabemos que buscas respuestas a tus problemas para no acudir a un psicólogo (Hermano, busca ayuda profesional 😐). _Y sí, están también los que quieren recibir amor y le piden se comporte como una pareja… 💑_
Es que literalmente, puedes hacer a un chatbot comportarse de cualquier forma que le indiques, darle las instrucciones que quieras, indicarle la forma en que devolverá las respuestas, cambiar la forma en que interpreta, ¡es totalmente moldeable a gusto!
_¿Cómo vas a querer rechazar o evitar su uso? Lo haces y simplemente quien queda atrás eres tú 🙊_
Ahora sí, es muy probable que muchos de ustedes lo sigan utilizando mal, por mala suerte estamos tan acostumbrados a los buscadores que para muchos es difícil interpretar que es un alguien y no un algo. Así que los ayudaré un poco en esto. Si este artículo recibe suficiente apoyo, subiré próximamente cómo mejorar las respuestas de ChatGPT en nuestras conversaciones y sacarle el máximo provecho. **¡Es una promesa! ✋️**
**_Cada semana traeré contenido interesante y variado, de desarrollo, personal, lo que se me ocurra. ¡Apoye este contenido para seguir obteniendo lo mejor de él!🍀_** | jzchannel03 |
1,901,790 | Looking for somebody learning Kotlin/Android | this is what I am looking for: somebody who has maybe just started to write in kotlin or also java.... | 0 | 2024-06-26T20:37:32 | https://dev.to/laurenz_holzhausen_d0dc5f/looking-for-somebody-learning-kotlinandroid-40c8 | android, kotlin | this is what I am looking for:
somebody who has maybe just started to write in kotlin or also java. The person is needed for the android side of an app update.
The app already exists, have a look here: https://apps.apple.com/gb/app/trazycarantulas/id1590680699
If you want to gain some experience with this project just give me DM.
| laurenz_holzhausen_d0dc5f |
1,864,041 | 6 Reasons Your Documentation Efforts Might Be a Waste of Time (And How to Fix It) | Technical documentation is a cornerstone of effective software development, providing a roadmap for... | 0 | 2024-06-26T20:34:42 | https://dev.to/ifrah/6-reasons-your-documentation-efforts-might-be-a-waste-of-time-and-how-to-fix-it-aol | productivity, documentation, programming | Technical documentation is a cornerstone of effective software development, providing a roadmap for users and developers alike. However, there are common pitfalls that can render even the most well-intentioned documentation efforts useless. Let's explore these pitfalls and how to avoid them.
## 1. 100% AI-Generated Content
AI can be a powerful tool for drafting documentation, but relying solely on it can lead to issues. AI lacks the nuanced understanding of context that you can bring. This results in potential inaccuracies and outdated information if not reviewed regularly.
**How to Fix It:**
- Always review and edit AI-generated content.
- Add human oversight to ensure context and accuracy.
- Ensure the quality of AI-generated content through rigorous oversight
- Integrate AI tools while maintaining human quality control.
## 2. Not Planning to Maintain It
Documentation is not a set-it-and-forget-it task. Without regular updates, it quickly becomes outdated. This can become more taxing in the long-run as it leads to confusion and errors.
How to Fix It:
- Establish a maintenance schedule for regular reviews and updates.
- Assign responsibility for keeping documentation current.
## 3. Rushing the Process
Hasty documentation often lacks the depth and accuracy needed to be truly useful. While deadlines are important, thoroughness should not be sacrificed. Incomplete but accurate information is more valuable than complete but vague content.
How to Fix It:
- Allocate sufficient time for documentation.
- Focus on accuracy and thoroughness from the start.
## 4. Adding Filler Content
Filler content dilutes the usefulness of documentation. Clear and concise writing is essential to avoid overwhelming users with unnecessary information.
How to Fix It:
- Be direct and to the point.
- Regularly review documentation to remove any filler content.
## 5. You Don't Know Your Audience
Understanding your audience is crucial. Since there is no one-size-fits-all solution, it is important to tailor your documentation to their level of expertise and knowledge.
How to Fix It:
- Explain technical jargon clearly.
- Make documentation accessible to an international audience by avoiding cultural biases and providing generalised examples.
-Use plain language and avoid heavy paragraphs.
- Use bullet points and headers to break up text for easy navigation.
## 6. You Don't Know Your Documentation Type
How to Fix It:
- Research about the different learning styles
- Different users prefer different formats. If you have the time and resource, provide a variety of documentation types to cater to various learning preferences. This can include how-to guides, tutorials, overviews, references, and real-code examples.
- Explore systems like Divio's documentation system and templates from platforms like GitHub and Notion.
- Utilise external resources and templates to enhance your documentation efforts.
## Conclusion
Effective technical documentation avoids common pitfalls like relying solely on AI, neglecting maintenance, rushing the process, and adding filler content. By prioritising accuracy, understanding your audience, and continuously improving your documentation, you can create resources that truly add value.
Are there any tips you stand by that I have missed out? Please let me know!
## Want to learn more about good documentation? Check out these resources:
[Divio's Four Approaches to Documentation](https://docs.divio.com/documentation-system/)
[ISO 9001 Documentation](https://www.iso.org/files/live/sites/isoorg/files/archive/pdf/en/02_guidance_on_the_documentation_requirements_of_iso_9001_2008..pdf)
[Literate Programming] (http://www.literateprogramming.com/)
| ifrah |
1,901,789 | Demasiados frameworks de JS, pero por qué? | A menudo se puede pensar que ya es repugnante la cantidad de frameworks que hay en el mercado, o... | 0 | 2024-06-26T20:30:49 | https://dev.to/jzchannel03/demasiados-frameworks-de-js-pero-por-que-25n6 | frameworks, webdev, javascript, astro | A menudo se puede pensar que ya es repugnante la cantidad de frameworks que hay en el mercado, o pensar que algunas personas han quedado fuera del tren de la tecnología y están en camino de quedarse sin trabajo pronto.
_¿Por qué cada día nace una nueva tecnología que cambia el método y la forma de trabajar con las interfaces web?_
La razón más simple es que es difícil agregar o cambiar ciertas características a los frameworks ya establecidos.
Como comenta Fernando Herrera en su podcast semanal “Devtalles”, todos los frameworks nuevos salen con la intención de incluir algo nuevo, además de partir de una buena base de código que pueda escalar e implementar algunas técnicas que les permitan ser más eficientes y ocupar menos espacio y recursos. **Increíble, ¿verdad?**
Aunque, sinceramente, si me preguntas cuál considero que le ha ido mejor, yo te respondería: **Astro.**
¿Por qué José???👀
> _Tantos nuevos frameworks que han implementado funcionalidades interesantes e ingeniosas que incluso han sido llevadas a los frameworks más utilizados, o esos mismos frameworks están buscando una manera de implementar su propia solución para no quedarse fuera de la tendencia._
> _Y para ti sólo Astro lo ha hecho bien ¿verdad? **¡Exactamente!** 😉_
Otros frameworks han incluido características valiosas para mencionar, como lo hizo SolidJS con las señales que todos quieren o tienen (incluso ya están en camino de estandarizarse en ES). Qwik con capacidad de reanudación, reducción absolutamente sorprendente de Javascript al cargar un sitio web, y así sucesivamente.
¿Qué pasa con todo esto?
Lo único que veo, en mi opinión, es que han trabajado horas y horas con la intención de presentar algo nuevo y llamar la atención, sólo para que grandes frameworks lo recojan e implementen. Y crean el marco sólo con la intención de tener un lugar donde ejecutar estas nuevas funciones.
No parece que tengan la intención de que su marco sea el que se utilice.
Además, todo parece deberse a la falta de comunicación entre los desarrolladores, la envidia y el egoísmo con el que sólo quieren conseguir algo primero y que mencionen su nombre. Para que así puedan ocupar un lugar en la historia como desarrolladores de esa característica y no estar a la sombra de un equipo.
El factor más grave para ellos está en las **librerías de npm**. Para React, Angular y Vue por ejemplo, existen bibliotecas con todo tipo de soluciones. Quieres implementar algo en tu sistema, buscas un poquito y ahí está, una biblioteca para solucionarlo.
Ahora, los reto a encontrar una solución de este tipo para nuevos frameworks. Antes de que te canses de buscar, mejor tómate ese tiempo y crea algo tú mismo, para contribuir a la comunidad del framework y aprender cosas nuevas😉.
Este punto débil no permite la aceptación masiva de cada nuevo framework que vemos, porque una empresa no se va a permitir volver a desarrollar cientos de funcionalidades que ya tienen bibliotecas que utilizan en sus proyectos. Sólo para utilizar esta nueva tecnología con el objetivo de reducir tiempos de desarrollo, añadir algo nuevo o estar a la moda.
_Por eso vemos que los sistemas bancarios siguen utilizando Cobol desde hace años, pero ese es otro tema._
Y aquí es donde me preguntas, José, ¿dónde está la que dices que fue la mejor idea en el momento de su creación? Ah si, estás hablando de Astro, este quedará pendiente para el próximo blog (no quiero extenderme tanto, lo siento😅).
_**Cada semana traeré contenido interesante y variado, de desarrollo, personal, lo que se me ocurra. ¡Apoye este contenido para seguir obteniendo lo mejor de él!🍀**_ | jzchannel03 |
1,901,788 | Mastering Contrast in UI Design: Enhancing User Experience Through Visual Dynamics | 👋 Hello, Dev Community! I'm Prince Chouhan, continuing my exploration into UI/UX design. Today,... | 0 | 2024-06-26T20:29:13 | https://dev.to/prince_chouhan/mastering-contrast-in-ui-design-enhancing-user-experience-through-visual-dynamics-1njh | ui, uidesign, ux, uxdesign | 👋 Hello, Dev Community!
I'm Prince Chouhan, continuing my exploration into UI/UX design. Today, let's delve into the essential topic of Contrast!
🗓️ Day 9 Topic: Contrast in UI Design
📚 Today's Learning Highlights:
Contrast Overview:
Contrast in UI design extends beyond color differences—it encompasses visual distinctions between elements to create interest, emphasize information, and guide user attention.
Types of Contrast:
1. Color Contrast:
- Definition: Variances in color or lightness between elements.
- Uses: Establishes hierarchy, highlights key elements, improves text readability.
2. Size Contrast:
- Definition: Differences in element size.
- Example: Larger buttons or text to emphasize important elements.
3. Shape Contrast:
- Definition: Varied shapes between elements.
4. Texture Contrast:
- Definition: Differences in texture.
- Uses: Adds depth, enhances visual appeal.
Importance of Contrast:
- Improves usability and navigation.
- Enhances overall user experience, particularly in color use.
🔍 In-Depth Analysis:
Today, I found the role of color contrast particularly intriguing, as it not only enhances aesthetics but also plays a crucial role in guiding user interaction and engagement.
🚀 Future Learning Goals:
Next, I aim to explore advanced techniques in applying contrast effectively across various UI components.
📢 Community Engagement:
How do you leverage contrast in your designs? Share your insights or tips with me!
💬 Quote of the Day:
"Contrast is not about black and white; it's about creating interest." - Unknown
Thank you for following along! Stay tuned for more updates on my UI/UX design journey.
hashtag#UIUXDesign hashtag#LearningJourney hashtag#DesignThinking hashtag#PrinceChouhan | prince_chouhan |
1,901,787 | So many JS frameworks, but why? | We can often think that it’s already disgusting how many frameworks there are on the market, or think... | 0 | 2024-06-26T20:24:45 | https://dev.to/jzchannel03/so-many-js-frameworks-but-why-1aka | frameworks, webdev, javascript, astro | We can often think that it’s already disgusting how many frameworks there are on the market, or think that some people have been left off the technology train and are on their way to being out of a job soon.
_Why is it that every day a new technology is born that changes the method and way of working with web interfaces?_
The simplest reason is that it is difficult to add or change certain features to established frameworks.
As Fernando Herrera commented in his weekly podcast “Devtalles”, all new frameworks come out with the intention of including something new, in addition to starting from a good code base that can scale and implement some techniques that allow them to be more efficient and take up less space and resources. **Incredible, right?**
**Although, honestly you ask me which one I consider has done better, and I would answer Astro.**
Why Jose???👀
> _So many frameworks that have implemented cool and ingenious functionalities that have even been implemented in the most used frameworks, or those same frameworks are looking for a way to implement their own solution to not stay out of the trend.
> And for you only Astro has done it right? Exactly!😉_
Other frameworks have included valuable features to mention, as did SolidJS with the signals that everyone wants or has (even already on the way to standardize on ES). Qwik with resumability capability, absolutely stunning reduction of Javascript when loading a website, and so on and on and on.
What’s up with all this?
The only thing I see, in my opinion, is that they have worked hours and hours with the intention of presenting something new and attracting attention, only for big frameworks to pick it up and implement it. And they create the framework only with the intention of having somewhere to run these new features.
It doesn’t look like they intend for their framework to be the one used.
Moreover, everything seems to be caused by lack of communication between developers, envy and selfishness with which they just want to get something first and have their name mentioned. So that they can take a place in history as the developer of that feature and not be in the shadow of a team.
The most serious factor for them is in npm libraries. For React, Angular and Vue for example, there are libraries with all kinds of solutions. You want to implement something in your system, you search a little bit and there it is, a library to solve it.
Now, I challenge you to find such a solution for new frameworks. Before you get tired of searching, better take that time and create something yourself, so you contribute to the framework community and learn new things😉.
This weak point does not allow the mass acceptance of every new framework we see, because a company is not going to allow itself to redevelop hundreds of features that already have libraries that they use in their projects. Just to use this new technology to reduce time, add something new or be trendy.
_That’s why we see banking systems of yearssssss still using Cobol, but this is another topic._
And this is where you ask me, Jose, where is the one you say was the best idea at the time of creation? Oh yes, you are talking about Astro, this one will be pending for the next blog (I don’t want to extend so much, sorry😅).
**_Each week I will bring interesting and varied content, developmental, personal, whatever comes to mind. Support this content to keep getting the best of it!🍀_**
| jzchannel03 |
1,901,770 | Test Observability for AWS Lambda with Grafana Tempo and OpenTelemetry Layers | I got great feedback from my Pulitzer award-winning blog post, "Testing AWS Lambda & Serverless... | 0 | 2024-06-26T20:18:38 | https://tracetest.io/blog/test-observability-for-aws-lambda-with-grafana-tempo-and-opentelemetry-layers | tracetest, tempo, opentelemetry, tracebasedtesting | I got great feedback from my Pulitzer award-winning blog post, "[Testing AWS Lambda & Serverless with OpenTelemetry](https://tracetest.io/blog/testing-aws-lambda-serverless-with-opentelemetry)". The community wanted a guide on using the official OpenTelemetry Lambda layers instead of a custom TypeScript wrapper. 😄
I decided to write this follow-up but to spice it up a little 🥵. Today I’m using Grafana Cloud, which has become one of my favorite tools! We use it extensively at Tracetest for our internal tracing, metrics, profiling, and overall observability.
> [See the full code for the example app you’ll build in the GitHub repo, here.](https://github.com/kubeshop/tracetest/tree/main/examples/quick-start-serverless-layers)
## OpenTelemetry Lambda Layers
With a decade of development experience, one thing I’ve learned is that no-code solutions help save time and delegate maintenance and implementation to a third party. It becomes even better when it's free 🤑 and from the [OpenTelemetry community](https://opentelemetry.io/docs/faas/)!
There are two different layers we will use today:
1. The Node.js auto-instrumentation for AWS Lambda enables tracing for your functions without writing a single line of code, as described in the [official OpenTelemetry docs, here](https://opentelemetry.io/docs/faas/lambda-auto-instrument/) and [on GitHub, here](https://github.com/open-telemetry/opentelemetry-lambda/releases/tag/layer-nodejs%2F0.6.0).
2. The [OpenTelemetry collector AWS Lambda layer](https://opentelemetry.io/docs/faas/lambda-collector/) enables the setup to be 100% serverless without any need to maintain infrastructure yourself. You still need to pay for it though 👀.
## Grafana Cloud
Grafana Cloud has become a staple tool to store everything related to observability under one umbrella. It allows integration with different tools like Prometheus for metrics or Loki for logs.
In this case, I’ll use [Tempo](https://grafana.com/products/cloud/traces/), a well-known tracing backend where you store the OpenTelemetry spans generated by the Lambda functions.
## Trace-based testing everywhere and for everyone!
[Trace-based testing](https://docs.tracetest.io/concepts/what-is-trace-based-testing) involves running validations against the telemetry data generated by the distributed system’s instrumented services.
[Tracetest](https://tracetest.io/), as an observability-enabled testing tool for Cloud Native architectures, leverages these distributed traces as part of testing, providing better visibility and testability to run trace-based tests.
## The Service under Test
Who said Pokemon? We truly love them at Tracetest, so today we have a new way of playing with the [PokeAPI](https://pokeapi.co/)!
Using the [Serverless Framework](https://www.serverless.com/), I’ll guide you through implementing a Lambda function that sends a request to the PokeAPI to grab Pokemon data by id, to then store it in a DynamoDB table.
Nothing fancy, but this will be enough to demonstrate how powerful instrumenting your Serverless functions and adding trace-based testing on top can be! 💥
## Requirements
### Tracetest Account
- Sign up to [`app.tracetest.io`](https://app.tracetest.io/) or follow the [get started](https://docs.tracetest.io/getting-started/installation) docs.
- Create an [environment](https://docs.tracetest.io/concepts/environments).
- Select `Application is publicly accessible` to get access to the environment's [Tracetest Cloud Agent endpoint](https://docs.tracetest.io/concepts/cloud-agent).
- Select Tempo as the tracing backend.
- Fill in the details of your Grafana Cloud Tempo instance by using the HTTP integration. Check out the tracing backend resource definition, here.
- Test the connection and save it to finish the process.
### AWS
- Have access to an [AWS Account](https://aws.amazon.com/).
- Install and configure the [AWS CLI](https://aws.amazon.com/cli/).
- Use a role that is allowed to provision the required resources.
## What are the steps to run it myself?
If you want to jump straight ahead to run this example yourself ⭐️.
First, clone the Tracetest repo.
```bash
git clone https://github.com/kubeshop/tracetest.git
cd examples/quick-start-serverless-layers
```
Then, follow the instructions to run the deployment and the trace-based tests:
1. Copy the `.env.template` file to `.env`.
2. Fill the `TRACETEST_API_TOKEN` value with the one generated for your Tracetest environment.
3. Set the Tracetest tracing backend to Tempo. Fill in the details of your Grafana Cloud Tempo instance by using the HTTP integration including headers looking like `authorization: Basic <base 64 encoded>`. It should be encoded `base64` with the format of `username:token`. Follow [this guide](https://grafana.com/blog/2021/04/13/how-to-send-traces-to-grafana-clouds-tempo-service-with-opentelemetry-collector/) to learn how. And, check out [this tracing backend resource definition](https://github.com/kubeshop/tracetest/blob/main/examples/quick-start-serverless-layers/tracetest-tracing-backend.yaml). You can apply it with the Tracetest CLI like this `tracetest apply datastore -f ./tracetest-tracing-backend.yaml`.
4. Fill the `authorization` header in the `collector.yaml` file from your Grafana Tempo Setup. It should be encoded `base64` with the format of `username:token`. Follow [this guide](https://grafana.com/blog/2021/04/13/how-to-send-traces-to-grafana-clouds-tempo-service-with-opentelemetry-collector/) to learn how.
5. Run `npm i`.
6. Run the Serverless Framework deployment with `npm run deploy`. Use the API Gateway endpoint from the output in your test below.
7. Run the trace-based tests with `npm test https://<api-gateway-id>.execute-api.us-east-1.amazonaws.com`.
Now, let’s dive into the nitty-gritty details. 🤓
## The Observability Setup
Instrumenting a Lambda function is easier than ever, depending on your AWS region, add the ARN of the [OpenTelemetry Collector](https://github.com/open-telemetry/opentelemetry-lambda/releases/tag/layer-collector%2F0.6.0) and the [Node.js tracer](https://github.com/open-telemetry/opentelemetry-lambda/releases/tag/layer-nodejs%2F0.6.0).
```yaml
# serverless.yaml
functions:
api:
# Handler and events definition
handler: src/handler.importPokemon
events:
- httpApi:
path: /import
method: post
# ARN of the layers
layers:
- arn:aws:lambda:us-east-1:184161586896:layer:opentelemetry-nodejs-0_6_0:1
- arn:aws:lambda:us-east-1:184161586896:layer:opentelemetry-collector-amd64-0_6_0:1
```
Next, add a couple of environment variables to configure the start of the handler functions and the configuration for the OpenTelemetry collector.
```yaml
# serverless.yaml
environment:
OPENTELEMETRY_COLLECTOR_CONFIG_FILE: /var/task/collector.yaml
AWS_LAMBDA_EXEC_WRAPPER: /opt/otel-handler
```
The `opentelemetry-nodejs` layer will spin off the Node.js tracer, configure the supported auto-instrumentation libraries, and set up the context propagators.
While the `opentelemetry-collector` layer is going to spin off a version of the collector executed in the same context as the AWS lambda layers, configured by [the `collector.yaml` file](https://github.com/kubeshop/tracetest/blob/main/examples/quick-start-serverless-layers/collector.yaml).
```yaml
# collector.yaml
receivers:
otlp:
protocols:
grpc:
endpoint: "0.0.0.0:4317"
http:
endpoint: "0.0.0.0:4318"
exporters:
otlp:
endpoint: tempo-us-central1.grafana.net:443
headers:
authorization: Basic <your basic64 encoded token>
service:
pipelines:
traces:
receivers: [otlp]
exporters: [otlp]
```
Easy peezy lemon squeezy 🍋 right? well, this is everything you need to do to start your observability journey!
## For every trace, there should be a test!
After having the observability setup, now is time to go to the next level by leveraging it by running some trace-based tests. This is our test case:
- Execute an HTTP request against the import Pokemon service.
- This is a two-step process that includes a request to the PokeAPI to grab the Pokemon data.
- Then, it executes the required database operations to store the Pokemon data in DynamoDB.
**What are the key parts we want to validate?**
1. Validate that the external service from the worker is called with the proper `POKEMON_ID` and returns `200`.
2. Validate that the duration of the DB operations is less than `100ms`.
3. Validate that the response from the initial API Gateway request is `200`.
## **Running the Trace-Based Tests**
To run the tests, we are using the `@tracetest/client` [NPM package](https://www.npmjs.com/package/@tracetest/client). It allows teams to enhance existing validation pipelines written in JavaScript or TypeScript by including trace-based tests in their toolset.
The code can be found in [the `tracetest.ts` file](https://github.com/kubeshop/pokeshop/blob/master/serverless/tracetest.ts).
```jsx
import Tracetest from '@tracetest/client';
import { TestResource } from '@tracetest/client/dist/modules/openapi-client';
import { config } from 'dotenv';
config();
const { TRACETEST_API_TOKEN = '' } = process.env;
const [raw = ''] = process.argv.slice(2);
let url = '';
try {
url = new URL(raw).origin;
} catch (error) {
console.error(
'The API Gateway URL is required as an argument. i.e: `npm test https://75yj353nn7.execute-api.us-east-1.amazonaws.com`'
);
process.exit(1);
}
const definition: TestResource = {
type: 'Test',
spec: {
id: 'ZV1G3v2IR',
name: 'Serverless: Import Pokemon',
trigger: {
type: 'http',
httpRequest: {
method: 'POST',
url: '${var:ENDPOINT}/import',
body: '{"id": "${var:POKEMON_ID}"}\n',
headers: [
{
key: 'Content-Type',
value: 'application/json',
},
],
},
},
specs: [
{
selector: 'span[tracetest.span.type="database"]',
name: 'All Database Spans: Processing time is less than 100ms',
assertions: ['attr:tracetest.span.duration < 100ms'],
},
{
selector: 'span[tracetest.span.type="http"]',
name: 'All HTTP Spans: Status code is 200',
assertions: ['attr:http.status_code = 200'],
},
{
selector:
'span[name="tracetest-serverless-dev-api"] span[tracetest.span.type="http" name="GET" http.method="GET"]',
name: 'The request matches the pokemon Id',
assertions: ['attr:http.url = "https://pokeapi.co/api/v2/pokemon/${var:POKEMON_ID}"'],
},
],
},
};
const main = async () => {
const tracetest = await Tracetest(TRACETEST_API_TOKEN);
const test = await tracetest.newTest(definition);
await tracetest.runTest(test, {
variables: [
{
key: 'ENDPOINT',
value: url.trim(),
},
{
key: 'POKEMON_ID',
value: `${Math.floor(Math.random() * 100) + 1}`,
},
],
});
console.log(await tracetest.getSummary());
};
main();
```
### Get True Test Observability
Make sure to apply the Tempo tracing backend in Tracetest. Create your Basic auth token, and use this resource file for reference. View [the `tracetest-tracing-backend.yaml` resource file on GitHub, here](https://github.com/kubeshop/tracetest/blob/main/examples/quick-start-serverless-layers/tracetest-tracing-backend.yaml).
```yaml
type: DataStore
spec:
id: tempo-cloud
name: Tempo
type: tempo
tempo:
type: http
http:
url: https://tempo-us-central1.grafana.net/tempo
headers:
authorization: Basic <base 64 encoded>
tls: {}
```
Apply the resource with the [Tracetest CLI](https://docs.tracetest.io/cli/cli-installation-reference).
```bash
tracetest config -t TRACETEST_API_TOKEN
tracetest apply datastore -f ./tracetest-tracing-backend.yaml
```
Or, add it manually in the Tracetest Web UI.
With everything set up and the trace-based tests executed against the PokeAPI, we can now view the complete results.
Run the test with the command below.
```bash
npm test https://<api-gateway-id>.execute-api.us-east-1.amazonaws.com
```
Follow the links provided in the `npm test` command output to find the full results, which include the generated trace and the test specs validation results.
```bash
[Output]
> tracetest-serverless@1.0.0 test
> ENDPOINT="$(sls info --verbose | grep HttpApiUrl | sed s/HttpApiUrl\:\ //g)" ts-node tracetest.ts https://<api-gateway-id>.execute-api.us-east-1.amazonaws.com/import
Run Group: #618f9cda-a87e-4e35-a9f4-10cfbc6f570f (https://app.tracetest.io/organizations/ttorg_ced62e34638d965e/environments/ttenv_a613d93805243f83/run/618f9cda-a87e-4e35-a9f4-10cfbc6f570f)
Failed: 0
Succeed: 1
Pending: 0
Runs:
✔ Serverless: Import Pokemon (https://app.tracetest.io/organizations/ttorg_ced62e34638d965e/environments/ttenv_a613d93805243f83/test/ZV1G3v2IR/run/22) - trace id: d111b18ca75fb6dbf170b66d963363f9
```
### Find the trace in Grafana Cloud Tempo
The full list of spans generated by the AWS Lambda function can be found in your Tempo instance, these are the same ones that are displayed in the Tracetest App after fetching them from Tempo.
> *👉 [Join the demo organization where you can start playing around with the Serverless example with no setup!!](https://app.tracetest.io/organizations/ttorg_2179a9cd8ba8dfa5/invites/invite_f9f784f30c85dc97/accept) 👈*
From the Tracetest test run view, you can view the list of spans generated by the Lambda function, their attributes, and the test spec results, which validate the key points.
## Key Takeaways
### Simplified Observability with OpenTelemetry Lambda Layers
In this post I’ve highlighted how using OpenTelemetry Lambda layers allows for automatic tracing without additional code, making it easier than ever to set up observability for your Serverless applications.
### Powerful Integration with Grafana Cloud
Grafana Cloud has become an essential tool in our observability toolkit. By leveraging Grafana Tempo for tracing, we can store and analyze OpenTelemetry spans effectively, showcasing the seamless integration and its benefits.
### Enhanced Trace-Based Testing with Tracetest
Tracetest is a game-changer for trace-based testing. By validating telemetry data from our instrumented services, it provides unparalleled visibility and testability, empowering us to ensure our distributed systems perform as expected.
Would you like to learn more about Tracetest and what it brings to the table? Check the [docs](https://docs.tracetest.io/examples-tutorials/recipes/running-tracetest-with-lightstep/) and try it out today by [signing up for free](https://app.tracetest.io/)!
Also, please feel free to join our [Slack community](https://dub.sh/tracetest-community), give [Tracetest a star on GitHub](https://github.com/kubeshop/tracetest), or [schedule a time to chat 1:1](https://calendly.com/ken-kubeshop/tracetest-walkthrough).
| xoscar |
1,901,769 | Announcing Swiftide, blazing fast data pipelines for RAG | While working with other Python-based tooling, frustrations arose around performance, stability, and... | 0 | 2024-06-26T20:15:29 | https://dev.to/timonv/announcing-swiftide-blazing-fast-data-pipelines-for-rag-4onb | llm, rust, ai, data | While working with other Python-based tooling, frustrations arose around performance, stability, and ease of use.
Excited to announce Swiftide, blazing fast data pipelines for Retrieval Augmented Generation written in Rust. Python bindings soon!
Check it out at https://swiftide.rs
```rust
IngestionPipeline::from_loader(FileLoader::new(".").with_extensions(&["md"]))
.then_chunk(ChunkMarkdown::with_chunk_range(10..512))
.then(MetadataQACode::new(openai_client.clone()))
.then_in_batch(10, Embed::new(openai_client.clone()))
.then_store_with(
Qdrant::try_from_url(qdrant_url)?
.batch_size(50)
.vector_size(1536)
.collection_name("swiftide-examples".to_string())
.build()?,
)
.run()
.await?;
```
Questions, feedback, complaints and great ideas are more than welcome in the comments <3
{% embed https://github.com/bosun-ai/swiftide %} | timonv |
1,901,767 | LeetCode Meditations — Chapter 12: Dynamic Programming | Dynamic programming (DP) is one of those concepts that is a bit intimidating when you hear it for the... | 26,418 | 2024-06-26T20:13:09 | https://rivea0.github.io/blog/leetcode-meditations-chapter-12-dynamic-programming | computerscience, algorithms, typescript, javascript | Dynamic programming (DP) is one of those concepts that is a bit intimidating when you hear it for the first time, but the crux of it is simply <mark>breaking problems down into smaller parts and solving them, also storing those solutions so that we don't have to compute them again.</mark>
Breaking problems down into subproblems is nothing new, that's pretty much what _problem-solving_ is all about. What dynamic programming is also specifically concerned with are **overlapping subproblems** that are repeating — we want to calculate solutions to those subproblems so that we won't be calculating them again each time. Put another way, *we want to remember the past so that we won't be condemned to repeat it*.
For example, calculating 1 + 1 + 1 + 1 + 1 is very easy, if we have already calculated 1 + 1 + 1 + 1. We can just remember the previous solution, and use it:
---
Calculating the Fibonacci sequence is one of the well-known examples when it comes to dynamic programming. Because we have to calculate the same functions each time for a new number, it lends itself to DP very well.
For example, to calculate `fib(4)` we need to calculate `fib(3)` and `fib(2)`.
However, calculating `fib(3)` also involves calculating `fib(2)`, so we'll be doing the same calculation, *again*.
A classic, good old recursive Fibonacci function might look like this:
```ts
function fib(n: number): number {
if (n === 0 || n === 1) {
return n;
}
return fib(n - 1) + fib(n - 2);
}
```
Though the issue we have just mentioned remains: we'll keep calculating the same values:
Then, how can we do better?
---
**Memoization** is remembering the problems we have solved before so that we don't have to solve them again and waste our time. We can *reuse* the solution to the subproblem we've already memoized.
So, we can keep a *cache* to store those solutions and use them:
```ts
function fib(n: number, cache: Map<number, number>): number {
if (cache.has(n)) {
return cache.get(n)!;
}
if (n === 0 || n === 1) {
return n;
}
const result = fib(n - 1, cache) + fib(n - 2, cache);
cache.set(n, result);
return result;
}
```
For example, we can initially pass an empty `Map` as the argument for `cache`, and print the first 15 Fibonacci numbers:
```ts
let m = new Map<number, number>();
for (let i = 0; i < 15; i++) {
console.log(fib(i, m));
}
/*
0
1
1
2
3
5
8
13
21
34
55
89
144
233
377
*/
```
---
There are two different approaches with dynamic programming: **top-down** and **bottom-up**.
Top-down is like what it sounds: starting with a large problem, breaking it down to smaller components, memoizing them. It's what we just did with the `fib` example.
Bottom-up is also like what it sounds: starting with the smallest subproblem, finding out a solution, and working our way up to the larger problem itself.
It also has an advantage: <mark>with the bottom-up approach, we don't need to store every previous value, we can only keep the two elements</mark> at the bottom so that we can use them to build up to our target.
With the bottom-up approach, our `fib` function can look like this:
```ts
function fib(n: number) {
let dp = [0, 1];
for (let i = 2; i <= n; i++) {
dp[i] = dp[i - 1] + dp[i - 2];
}
return dp[n];
}
```
However, note that we are keeping an array whose size will grow linearly as the input increases. So, we can do better with constant space complexity, not using an array at all:
```ts
function fib(n: number) {
if (n === 0 || n === 1) {
return n;
}
let a = 0;
let b = 1;
for (let i = 2; i <= n; i++) {
let tmp = a + b;
a = b;
b = tmp;
}
return b;
}
```
---
#### Time and space complexity
The time complexities for both the top-down and bottom-up approaches in the Fibonacci example are {% katex inline %} O(n) {% endkatex %} as we solve each subproblem, each of which are of constant time.
| Note |
| :-- |
| The time complexity of the recursive Fibonacci function that doesn't use DP is exponential (in fact, {% katex inline %} O(\phi^{n}) {% endkatex %} — yes [the golden ratio](https://en.wikipedia.org/wiki/Golden_ratio) as its base). |
However, when it comes to space complexity, the bottom-up approach (the second version) is {% katex inline %} O(1) {% endkatex %}.
| Note |
| :-- |
| The first version we've used for the bottom-up approach has {% katex inline %} O(n) {% endkatex %} time complexity as we store the values in an array. |
The top-down approach has {% katex inline %} O(n) {% endkatex %} space complexity because we store a `Map` whose size will grow linearly as `n` increases.
---
The first problem we're going to look at in this chapter is [Climbing Stairs](https://leetcode.com/problems/climbing-stairs). Until then, happy coding.
| rivea0 |
1,901,765 | Vision Loss People application | I have been asked to provide a solution as Fullstack java developer to design the application so... | 0 | 2024-06-26T20:12:28 | https://dev.to/codekiller/vision-loss-people-application-oci | I have been asked to provide a solution as Fullstack java developer to design the application so that vision loss people also can use it.As part my Health industry.Any suggestions are welcome. | codekiller | |
1,901,762 | 🚀 Invitation to Test and Review: AutoCAD Points Import Plugin 🚀 | Hey everyone! I'm excited to announce the release of my AutoCAD Points Import Plugin! 🎉 This plugin... | 0 | 2024-06-26T20:11:14 | https://dev.to/dzt/invitation-to-test-and-review-autocad-points-import-plugin-43db | autocad, csharp, beginners, tutorial | Hey everyone!
I'm excited to announce the release of my AutoCAD Points Import Plugin! 🎉 This plugin simplifies the process of importing point data from text files into AutoCAD drawings, streamlining your workflow and enhancing productivity.
Key Features:
Effortless Import: Directly import points from structured text files.
Flexible Configuration: Customize coordinate settings for seamless integration.
Error Handling: Robust error management ensures smooth operation.
I'm looking for testers and reviewers to give it a try and provide feedback. Your insights are invaluable in shaping the future of this plugin!
How to Get Started:
📥 Download the plugin from the [GitHub repository](https://github.com/DZ-T/Text-To-AutoCAD/).
🛠️ Install and integrate it into your AutoCAD environment.
🚀 Explore its features and functionalities.
📝 Share your feedback, suggestions for improvements, or any bugs you encounter.
Your feedback will help me enhance the plugin further and prioritize new features. Let's make this tool even more powerful together!
Repository Link: [TEXT-TO-AUTOCAD](https://github.com/DZ-T/Text-To-AutoCAD/)
Feel free to reach out with any questions or suggestions. Looking forward to hearing from you!
Cheers, [Taha Mk]
| dzt |
1,901,759 | How to Send Emails With Google App Script | If you’re a beginner like me and have spent hours unsuccessfully searching for the right piece of... | 0 | 2024-06-26T20:10:13 | https://mailtrap.io/blog/google-scripts-send-email/ | If you’re a beginner like me and have spent hours unsuccessfully searching for the right piece of content or GitHub page that covers how to use Google App Script to send email, you’re in the right place!
In this article, I will take you step by step through the process of sending emails via Google Scripts.
So hold tight; we’re in for a ride!
Know your options: MailApp vs GmailApp
During my research on the topic of sending emails with Google Apps Script – the JavaScript cloud scripting language – I noticed two services repeatedly mentioned. Those services are MailApp and GmailApp.
What I discovered after looking into them was that both are intended to send emails but come with different functionalities and cater to different needs. So, let’s break them down so you can confidently choose the best service for your specific use case!
Snapshot comparison:
Use MailApp if your email-sending tasks have minimal requirements and are straightforward.
Use GmailApp when you need to interact with Gmail features and complex email functionalities.
MailApp:
Great for sending plain text or HTML emails that don’t require you to interact with the full Gmail features
Does not directly interact with the Gmail interface, and emails sent through MailApp don’t appear in the Gmail “Sent” folder
Has an email sending limit based on your Google account type (e.g., free, Google Workspace) and is separate from the Gmail account sending limits
Intended for heavy Gmail users
GmailApp:
Comes with a rich set of features for completing more complex email-sending tasks, such as sending from aliases, changing the status of an email to read/unread, email search, and label manipulation
Has full integration with the sender’s Gmail account, and emails sent with GmailApp appear in the Gmail “Sent” folder
Provides high flexibility for handling complex email compositions such as rich email formatting and including inline images
Has an email sending limit based on your Gmail account sending limit
Not suitable for bulk email senders and heavy Gmail users
How to send emails using Google Apps Script
To send my emails from Google Apps Script, I decided to go with the GmailApp service. Why? Well, simply because it’s more advanced. So, for the rest of this tutorial and in the code snippets, you’ll see me using this service.
With that out of the way, let’s get into the email-sending process, starting with plain text emails.
**Step 1 – Get your Google Apps Script Editor ready
**
To write the code that will facilitate the email sending, you need to head over to the Google Apps Script website and log in with your Google account.
Then, click on New Project to create a new script.
**Step 2 – Start writing the script
**
The script I used to send emails is pretty simple.
In the script code, I first set the email recipient and subject. Then, I define the message body before calling the sendEmail function and passing it all the necessary parameters.
`function sendPlainTextEmailDirectlyWithGmailApp() {
var emailaddress = 'recipient@example.com'; // Replace with the actual recipient's email address
var subject = 'Test Email Subject'; // Replace with your desired subject
var message = 'This is a plain text email body.'; // Replace with your plain text message
// Send the email directly
GmailApp.sendEmail(emailaddress, subject, message);
}`
**Step 3 – Save your project and give it a name
**
Before you run your code, the project created needs to be saved and named. This can be done by clicking on the good old floppy disk icon.
**Step 4 – 3, 2, 1…Run the script
**
And just like that, your code is ready to run! So, now, go into your script editor, select the function you want to run from the dropdown, and click the play (▶️) icon.
**Step 5 – Authorize the script
**
If it’s your first time running your script, Google will ask you to give the application authorization for sending on your behalf.
Once this happens, review permissions, choose your account, and grant the permissions necessary for the script to send emails and manage them for you.
**Note:** Steps such as opening the script editor, saving and running your project, as well as authorizing the script will be essentially the same for all the other email types I cover in this article. So, to avoid repetition, I will mostly skip including these steps from this point on.
**HTML emails
**
In the previous section, I focussed only on plain text email. Now, I’ll take it a level up by showing you how I sent HTML emails.
As the code for sending plain text and HTML emails is not that significantly different, I simply modified what I had already written to fit my HTML email-sending needs.
`function sendHtmlEmailWithGmailApp() {
var recipient = 'recipient@example.com'; // Replace with the actual recipient's email address
var subject = 'Test HTML Email Subject'; // Replace with your desired subject
// Define the HTML body of the email
var htmlBody = '<h1>Hello!</h1>' +
'<p>This is an <strong>HTML</strong> email.</p>';
// Send the email with the HTML body
GmailApp.sendEmail(recipient, subject, '', {
htmlBody: htmlBody
});
}`
When inspecting the modified code above, you will notice that while setting the body of the email, I formatted it as HTML. I then called the same sendEmail function and passed it the four instead of three parameters – recipient, subject, an empty string, and an object.
The object passed to the function contains a single property called htmlBody, which is set to the variable containing the body of the email. Thanks to this property, GmailApp knows how to use HTML content as the email body.
The empty string is passed instead of a regular parameter typically used to set the plain text body of the email, which, in this case, is not necessary.
**Emails with attachments
**
Adding an attachment when sending an email using Google Apps Script is a two-step process – first, you retrieve the file from Google Drive or another source, and then you attach it to the email message.
To retrieve the file, I used the following code snippet:
DriveApp.getFilesByName("Example.pdf").next()
This snippet uses the DriveApp Google Apps Script service and its getFilesByName function. As the getFilesByName function returns a collection of files that match a specific name, another function, next, is called on the returned object.
Then, to attach the retrieved file, I passed a fourth parameter to the sendEmail function. This parameter represents an array that can include one or more attachments.
`GmailApp.sendEmail(recipient, subject, body, {
attachments: [file.getAs(MimeType.PDF)] // Adjust the MIME type as necessary
});
In my code, you will also see the getAs function. This function converts an attached file into a specific format. Here are some examples of how to use getAs to complete various file conversions:
file.getAs(MimeType.MICROSOFT_WORD);
file.getAs(MimeType.PLAIN_TEXT);
file.getAs(MimeType.JPEG);
file.getAs(MimeType.PNG);
file.getAs(MimeType.CSV);
file.getAs(MimeType.HTML);`
And here is the full email-sending code:
`function sendEmailWithAttachment() {
var recipient = "recipient@example.com"; // Replace with the recipient's email address
var subject = "Email with Attachment"; // Replace with your email subject
var body = "Please find the attached file."; // Plain text body of the email
var file = DriveApp.getFilesByName("Example.pdf").next(); // Replace 'Example.pdf' with your file's name
GmailApp.sendEmail(recipient, subject, body, {
attachments: [file.getAs(MimeType.PDF)] // Adjust the MIME type as necessary
});
}`
getFileById route
Google Apps Script facilitates more than one way of adding an attachment. So, besides the getFilesByName function paired with passing the attachments as an array, there is also the getFileById function and Blob (yes, you read that right :D) combination.
So, instead of retrieving the file by name, you can also retrieve it by ID. And instead of attaching an array, you can attach a Blob – a binary large object representing data that can be treated as a file.
Using a Blob is a straightforward way to attach files without needing to adjust or specify the file format explicitly. And this is what it looks like when implemented in my code:
`function sendEmailWithAttachment() {
// Define the email parameters
var recipient = 'recipient@example.com';
var subject = 'Test Email with Attachment';
var body = 'This is a plain text email with an attachment.';
// Get the file from Google Drive (replace 'fileId' with the actual file ID)
var file = DriveApp.getFileById('fileId');
// Create a blob from the file
var blob = file.getBlob();
// Send the email with the attachment
GmailApp.sendEmail(recipient, subject, body, {
attachments: [blob]
});
}`
Emails with multiple recipients
HTML content covered, attachments covered, and single-recipient emails covered. But what if you want to share your email with more than one person? For that, I found two options:
separating the email addresses with commas within a single string
using an array of email addresses and then joining them into a string
Let me show you both!
When it comes to the first option, you need to modify the recipient variable in your script by setting its value to be a string containing email addresses separated by commas.
Then, simply pass the variable to the function sendEmail as you did earlier.
`function sendEmailToMultipleRecipients() {
var recipients = "recipient1@example.com,recipient2@example.com"; // Separate email addresses with commas
var subject = "Email to Multiple Recipients";
var body = "This is a test email sent to multiple recipients.";
GmailApp.sendEmail(recipients, subject, body);
}`
The second option also involves modifying the recipient variable in your script. Only this time, the variable’s value will be set to an array of strings, each representing an email address.
The array is then combined into a single string, separated by commas, using the join function.
`function sendEmailToArrayOfRecipients() {
var recipientArray = ["recipient1@example.com", "recipient2@example.com", "recipient3@example.com"]; // An array of email addresses
var recipients = recipientArray.join(","); // Join the array into a comma-separated string
var subject = "Email to Multiple Recipients";
var body = "This is a test email sent to multiple recipients.";
GmailApp.sendEmail(recipients, subject, body);
}`
The latter approach is particularly useful if the list of recipients is dynamic or large.
CC and BCC recipients
If you want to include CC or BCC recipients in the emails you send from Google Apps Script, at your disposal are the CC and BCC fields in the optional parameters object.
Here is how I made use of them:
`function sendEmailWithCCAndBCC() {
var primaryRecipient = "primary@example.com"; // Primary recipient
var ccRecipients = "cc1@example.com,cc2@example.com"; // CC recipients
var bccRecipients = "bcc1@example.com,bcc2@example.com"; // BCC recipients
var subject = "Email with CC and BCC";
var body = "This email is sent with CC and BCC recipients.";
GmailApp.sendEmail(primaryRecipient, subject, body, {
cc: ccRecipients,
bcc: bccRecipients
});
}`
How to send condition-based emails using Google Apps Script
With manual email-sending out of the way, it’s time for some automation.
In Google Apps Script, automation is used when sending condition-based emails. What’s particularly interesting about these emails is that they leverage the ability of Google Apps Script to interact with Google Services such as Gmail, Sheets, Docs, etc.
Personally, I like to use condition-based emails for tasks such as automating email notifications, reminders, or alerts. And here’s how!
Sending email based on cell value
Let’s imagine you have an Excel or Google spreadsheet containing data on inventory levels. Once those levels drop below a certain threshold, you want to send out an automatic notification or alert to whoever is responsible.
To do so in Google Apps Script, you’ll need the following code:
`function checkCellValueAndSendEmail() {
// ID of the Google Sheet you want to check
var sheetId = 'YOUR_SHEET_ID_HERE';
var sheet = SpreadsheetApp.openById(sheetId).getActiveSheet();
// Assuming the value to check is in cell A1
var cellValue = sheet.getRange('A1').getValue();
// Condition to send email
if (cellValue === 'Send Email') {
var email = 'recipient@example.com'; // Replace with the recipient's email
var subject = 'Alert from Google Sheet';
var body = 'The condition to send an email has been met.';
GmailApp.sendEmail(email, subject, body);
}
}
`What this code does is open a sheet based on an ID you define and pass to the openById function. It then selects a data range within the sheet. In the case of my code, that range is specified as “A1”, which refers to the cell located in column A and row 1 of the spreadsheet.
If the cell value equals “Send Email”, my code then composes and sends an email in the same manner I covered in the previous sections. Cool, huh?
Automate your script further (Optional)
Within the Google Apps Script editor, you can set a script to run according to a schedule or after an event.
This is done by:
- Clicking on the clock icon (Triggers icon) in the left sidebar.
- Clicking + Add Trigger in the bottom right corner.
Choosing the function you want to run and setting the event source (for the code to run at specific intervals, Time-driven should be the event source)
- Clicking Save.
I should note that when you are setting up the script and email triggers, you’ll need to make sure all necessary permissions are granted for the script to run. For the example I provided, these permissions would include accessing Google Sheets data and sending emails.
Sending email after form submission
Another use case of Google Apps Script that I found particularly cool is the creation of automated emails after a Google Form submission.
To do so, all you need is to create a trigger that runs a code snippet after each response you receive. The code, you guessed it, will send an email using the GmailApp service.
This is how I linked my Google Form and email-sending code:
**Step 1 – Retrieve the form ID
**
The unique ID of each Google form can be found in its URL. These URLs should have the following format:
https://docs.google.com/forms/d/e/[FORM_ID]/viewform
Once you have the ID, copy and save it, as you’ll need to incorporate it into the code soon.
**Step 2 – Get the code ready
**
The code I used for this task is just slightly different from the code used for plain text email sending. So, along with the standard tasks of defining the recipient, subject, and body as well as calling the sendEmail function, at the top of the code you’ll extract all the form responses and then access a specific response.
The extracting is done using the getItemResponses function. Accessing a specific response, on the other hand, is done by calling the getResponse function on a variable holding an array of responses from a form submission.
This is how it all looks in code:
function sendEmailAfterFormSubmit() {
var form = FormApp.openById(‘TARGET_FORM_ID’);
var responsesCount = form.getResponses().length;
var responses = form.getResponses();
var response = responses[responsesCount-1];
var responseItems = response.getItemResponses();
var firstResponse = responseItems[0].getResponse();
// Email details
var email =recipient@example.com';
var subject = 'New Form Submission';
var body = 'A new form has been submitted. First question response: ' + firstResponse;
GmailApp.sendEmail(email, subject, body);
If you want to customize the email content further based on a form response, you can do so by accessing different parts of the responses array.
My form consisted of 3 questions:
What is your name?
What is your favorite color?
Please provide your feedback.
And to customize my email, I used the following code:
`function sendCustomEmailAfterFormSubmit() {
// Access the form responses from the event object
var form = FormApp.openById(‘TARGET_FORM_ID’);
var responsesCount = form.getResponses().length;
var responses = form.getResponses();
var response = responses[responsesCount-1];
var responseItems = response.getItemResponses();
// Extracting individual responses
var nameResponse = responseItems[0].getResponse(); // Response to the first question (name)
var colorResponse = responseItems[1].getResponse(); // Response to the second question (favorite color)
var feedbackResponse = responseItems[2].getResponse(); // Response to the third question (feedback)
// Email details
var recipient = 'recipient@example.com'; // Replace with the actual recipient's email
var subject = 'Thank You for Your Feedback';
// Customizing the email body with the form responses
var body = "Hello " + nameResponse + ",\n\n" +
"Thank you for submitting your feedback. " +
"We are glad to know that your favorite color is " + colorResponse + ". " +
"Here's the feedback we received from you:\n" +
"\"" + feedbackResponse + "\"\n\n" +
"We appreciate your input and will get back to you shortly.";
// Sending the customized email
GmailApp.sendEmail(recipient, subject, body);
}`
Limitations of sending with Google Apps Script
By this point in the article, you’re probably thinking, “Man, you can do a lot with Google Apps Script”. And yes, you’re right, but there are limitations.
Let me introduce you to the key ones!
Daily quota – daily quota limits are enforced by Google Apps Script on sending emails and these vary based on the account type (e.g., personal Gmail vs. Google Workspace). Along with the number of emails, these limits also extend to the number of recipients.
Execution time – limits are posed on the total execution time per day for scripts as well as individual script executions. For most accounts, 6 minutes is the maximum execution time per script.
Concurrent executions – the number of scripts that can execute concurrently is limited, affecting scripts designed to handle high volumes of requests or operations simultaneously.
URL fetch calls and external requests – the number of calls and the size of the request, as well as the response, are limited for scripts that make external network calls, such as ones to APIs and web services.
Script project and storage size – Google Apps Script has a maximum size limit for each script and the data stored by it when using various services within the platform (Properties Service, Cache Service, etc.).
Libraries and dependencies – per project, there is a limit on the number and the size of libraries used.
How to send emails with Google Apps Script and email API?
While sending through the Gmail service is pretty simple and effective, I like to have a bit more flexibility and features. For this, the option I gravitate to the most is using an email API.
In Google Apps Script, HTTP requests to external email APIs are made using the UrlFetchApp service. And I will now show you how to make such a request to a reliable email API offered by Mailtrap Email Sending.
With Mailtrap Email Sending, you get an email infrastructure with high deliverability rates by design. On top of that, you can expect each email you send through this sending solution to reach a recipient’s inbox in seconds.
**Limitations of sending with Google Apps Script
**
By this point in the article, you’re probably thinking, “Man, you can do a lot with Google Apps Script”. And yes, you’re right, but there are limitations.
Let me introduce you to the key ones!
- Daily quota – daily quota limits are enforced by Google Apps Script on sending emails and these vary based on the account type (e.g., personal Gmail vs. Google Workspace). Along with the number of emails, these limits also extend to the number of recipients.
- Execution time – limits are posed on the total execution time per day for scripts as well as individual script executions. For most accounts, 6 minutes is the maximum execution time per script.
- Concurrent executions – the number of scripts that can execute concurrently is limited, affecting scripts designed to handle high volumes of requests or operations simultaneously.
- URL fetch calls and external requests – the number of calls and the size of the request, as well as the response, are limited for scripts that make external network calls, such as ones to APIs and web services.
- Script project and storage size – Google Apps Script has a maximum size limit for each script and the data stored by it when using various services within the platform (Properties Service, Cache Service, etc.).
- Libraries and dependencies – per project, there is a limit on the number and the size of libraries used.
**How to send emails with Google Apps Script and email API?
**
Read the full article on the [Mailtrap blog](https://mailtrap.io/blog/google-scripts-send-email/)!
| dzenanakajtaz | |
1,901,702 | 🌐 How to Change Time Zone in Google Chrome to Test Different Timezones | Have you ever wondered how your website or app behaves in different time zones? Maybe you’ve got... | 0 | 2024-06-26T20:09:12 | https://dev.to/enszrlu/how-to-change-time-zone-in-google-chrome-to-test-different-timezones-2j18 | webdev, testing, debug, timezone | Have you ever wondered how your website or app behaves in different time zones? Maybe you’ve got users all around the globe, and you need to ensure everything works perfectly no matter where they are. Or you deployed your application and the time does not show as it is supposed to, even though it works locally. Then you update your code and don't know how you can simulate the server behavior? Well, good news! You don’t need to jet-set across time zones to test it out. With Google Chrome's Developer Tools, you can change the browser's time zone and test your site or app like a globe-trotting genius.
This is a short and brief tutorial that I wrote after having the exact same issue with my teammate. Let's dive into the world of time-travel testing! 🕰️✨
## Why Testing Different Time Zones is Important
Imagine this: Your app is a big hit in your home country. Great! But what happens when it gains international users? Users in different time zones might face issues that you’ve never encountered before. Date and time bugs can cause significant problems, like missed appointments, incorrect timestamps, and erroneous calculations. Also, running your app on a server that’s in a different time zone than your users can lead to similar unexpected results. Testing in different time zones helps you catch these bugs before your users do!
## Using Google Chrome Developer Tools to Change Timezone
Here's a simple step-by-step guide to change the time zone in Google Chrome for testing purposes:
### Step 1: Open Developer Tools in Chrome
First things first, open Chrome and hit F12 or right-click anywhere on the page and select "Inspect". This will open the Developer Tools panel.
### Step 2: Open the Console Drawer and Sensors
Now that you have the Developer Tools open, look for the three vertical dots in the top right corner of the panel. Click on them and select “More tools” -> “Sensors”.
### Step 3: Set Your Location and Timezone
In the Sensors tab, you will see a section labeled "Location". Here you can set your location by choosing a predefined city or entering custom coordinates. More importantly, you can change the time zone to whatever you need for testing.
And voilà! You’ve just time-traveled in Chrome. Now you can test how your app behaves in any time zone. Cool, right? 😎 Plus, it’s super easy!
So next time you need to test your app’s behavior in different time zones, remember this little trick. Happy testing, time traveler!
Do you have any other cool testing tricks up your sleeve? Share them in the comments!
| enszrlu |
1,901,752 | From Pods to Projects: Mastering Task Management the Whale-some Way | As I delved further into the project management process, I discovered an intriguing parallel: we can... | 0 | 2024-06-26T20:08:24 | https://dev.to/rasyidf/from-pods-to-projects-mastering-task-management-the-whale-some-way-5gad | management, projectmanagement, learning | As I delved further into the project management process, I discovered an intriguing parallel: we can learn a lot from how whales manage their pods. Here's my journey into this oceanic analogy.
In the vast ocean of project management, tracking progress can feel as daunting as navigating the deep blue sea. However, adopting the principles of a whale pod simplified the process for me, ensuring smooth and efficient project tracking. Allow me to take you through this journey, where the wisdom of whales provided a relaxed yet effective approach to project management.
## Estimation Philosophy: Swimming in Sync
When I started out, traditional project tracking seemed to demand pinpoint accuracy, like a lone whale searching for the perfect current. But watching whale pods taught me the power of consistency and collaboration. By maintaining steady estimates and adjusting predictions with a load factor—much like the gentle sway of a whale’s tail—teams can focus on completing tasks rather than obsessing over exact hours spent.
## Breaking Down Tasks: From Giant Whales to Agile Dolphins
I noticed how a pod of whales collaborates to tackle large tasks, inspiring me to break down our project tasks into manageable pieces. We aimed for tasks that could be completed in 0.25 to 2 ideal days. It felt like teaching a whale calf to swim—small, achievable strokes leading to success. This approach made tracking easier and boosted team morale as we saw our progress ripple through the water.
## Simplified Progress Tracking: The Whale Song of Success
Visual aids became our version of the hauntingly beautiful whale songs. A simple bar graph showing completed and estimated remaining tasks provided a clear overview. Rather than relying on complex predictions, we displayed our current progress and let stakeholders infer trends, much like interpreting the rhythms and patterns of a whale’s song.
## Handling Scope Changes: Navigating New Currents
Scope changes felt inevitable, much like the shifting ocean currents. We ensured our tracking tools could account for these changes to provide an accurate picture of progress. Visual representations of scope changes helped communicate their impact to stakeholders, just as a whale pod adapts to new waters and communicates through body language and song.
## Encouraging User Engagement: The Pod Mentality
Simplified tracking methods encouraged our team to engage actively, mirroring the close-knit cooperation of a whale pod. Visible progress, like a color-coded iteration board, provided immediate feedback and motivated team members. This approach allowed us to quickly identify the status of each task without delving into detailed reports, much like how whales recognize each other's roles and statuses within the pod.
## Sailing Smoothly with Simple Tools
Effective project tracking doesn’t require complex tools or meticulous data recording. By focusing on consistent estimates, breaking down tasks, and using simple visual aids, project managers can maintain control and ensure steady progress. Inspired by the wisdom of whale pods, this approach offers a practical way to navigate the ocean of project management with grace and efficiency.
## Conclusion
In the end, project management is about finding harmony and balance within the team, much like a whale pod navigating the vast ocean together. By adopting these whale-inspired strategies, you can lead your team to smoother sailing and greater achievements. So, take a deep breath, dive in, and let the wisdom of the whales guide your project management journey.
TL;DR:
> I discovered how project management can be inspired by the behavior of whale pods. By adopting principles of consistency, collaboration, task breakdown, and simple visual tracking, teams can navigate projects more smoothly. Learn how to handle scope changes and boost team engagement, drawing wisdom from the gentle giants of the ocean.
| rasyidf |
1,901,756 | SHOPIFY HELP SUPPORT | Do you need assistance with a Shopify store? I can assist you in designing your Shopify store with... | 0 | 2024-06-26T20:08:15 | https://dev.to/haastrup/shopify-help-support-9oe | Do you need assistance with a Shopify store?
I can assist you in designing your Shopify store with the features you've asked to increase sales.
I'm excited to hear more about your needs and work with you to continue talking about your project and how I can support you.
Reach out to me right now
| haastrup | |
1,901,754 | The Ultimate 9-Week Anti-Procrastination Challenge 🚀 | The Ultimate 9-Week Anti-Procrastination Challenge 🚀 Are you tired of endless scrolling and putting... | 0 | 2024-06-26T20:04:49 | https://dev.to/newme/the-ultimate-9-week-anti-procrastination-challenge-2485 | procrastination, productivity | The Ultimate 9-Week Anti-Procrastination Challenge 🚀
Are you tired of endless scrolling and putting things off? It’s time to change that and embrace productivity! Join our 9-week Anti-Procrastination Challenge and see how much you can accomplish. Each week, we’ll provide you with actionable tips to help you stay focused and beat procrastination. Let’s dive in!
Week 1: Set the Foundation
Set Daily Goals Each morning, write down three things you absolutely want to achieve by the end of the day. Keep them realistic and manageable to ensure you stay on track.
Limit Screen Time Use apps like Screen Time or Digital Wellbeing to set limits on your social media usage. Try reducing it by just 30 minutes a day to see a significant improvement.
Use the 2-Minute Rule If a task will take less than 2 minutes, do it immediately. You’ll be surprised at how much you can get done with this simple rule!
Let’s crush procrastination together!
Week 2: Build on Your Success
Use a Timer Work in short, focused bursts using the Pomodoro Technique: 25 minutes of work followed by a 5-minute break. This method helps maintain focus and productivity.
Create a Dedicated Workspace Designate a specific area for work to help your brain switch into productivity mode. A dedicated workspace can significantly enhance your focus.
Prioritize Tasks Tackle the most important tasks first thing in the morning when your energy is highest. This ensures that your most critical work gets done.
Let’s continue beating procrastination!
Week 3: Enhance Your Strategy
Break Tasks into Smaller Steps Large tasks can be overwhelming. Break them down into smaller, manageable steps to make progress easier and more achievable.
Set Clear Deadlines Assign deadlines to your tasks to create a sense of urgency and keep you focused.
Eliminate Distractions Turn off notifications, close unnecessary tabs, and create a quiet environment to stay focused.
Let’s keep conquering procrastination!
Week 4: Stay Motivated
Visualize Succes Spend a few minutes each day visualizing the successful completion of your tasks. It can boost motivation and focus.
Use a To-Do List Write down all the tasks you need to accomplish and check them off as you go. It feels satisfying and keeps you organized.
Reward Yourself After completing a task, give yourself a small reward. It can be a break, a snack, or anything that makes you happy.
Let’s keep pushing forward!
Week 5: Optimize Your Productivity
Find Your Peak Hours Identify when you’re most productive during the day and schedule your most important tasks for those times.
Batch Similar Tasks Group similar tasks together and complete them in one go. This reduces the time spent switching between tasks.
Stay Hydrated and Healthy Drink plenty of water and eat nutritious foods to keep your energy levels up throughout the day.
Let’s stay productive and healthy!
Week 6: Plan and Prepare
Plan Ahead Spend a few minutes each evening planning the next day. It prepares your mind and helps you hit the ground running.
Stay Accountabl Share your goals with a friend or join a productivity group. Accountability can keep you on track.
Use Positive Affirmations Start your day with positive affirmations to boost your confidence and motivation.
Let’s keep striving for success!
Week 7: Maintain Focus
Declutter Your Space A tidy workspace can lead to a clearer mind and improved focus. Spend a few minutes each day organizing your area.
Use a Habit Tracker Track your progress with a habit tracker to stay motivated and see how far you’ve come.
Learn to Say No Protect your time by politely declining tasks or commitments that don’t align with your goals.
Let’s stay focused and organized!
Week 8: Innovate and Automate
Practice Mindfulness Spend a few minutes each day practicing mindfulness or meditation to reduce stress and improve focus.
Automate Routine Tasks Use technology to automate repetitive tasks, freeing up more time for important work.
Set Time Limits Allocate a specific amount of time to each task and stick to it. It prevents tasks from dragging on indefinitely.
Let’s keep up the great work!
Week 9: Finish Strong
Take Care of Your Mental Health Make time for activities that boost your mental health, like exercise, hobbies, or spending time with loved ones.
Limit Multitasking Focus on one task at a time to improve the quality and efficiency of your work.
Use Music to Focus Listen to instrumental or low-fi music to help you concentrate and stay productive.
Let’s finish strong!
Conclusion
Procrastination is a common challenge, but with the right strategies, you can overcome it and achieve your goals. Follow this 9-week Anti-Procrastination Challenge and watch your productivity soar. Remember, each small step you take brings you closer to a more productive and fulfilling life. Let's conquer procrastination together!
| newme |
1,894,873 | Understanding Object Destructuring in Javascript. | Introduction In the world of modern JavaScript development, efficiency and readability are... | 0 | 2024-06-26T20:02:52 | https://dev.to/zache_niyokwizera_3ea666/understanding-object-destructuring-in-javascript-53m1 | javascript, webdev, beginners, programming |
## Introduction
In the world of modern JavaScript development, efficiency and readability are crucial. Object destructuring is a feature that significantly enhances both by allowing developers to unpack values from objects and arrays into distinct variables. This makes the code more concise and easier to understand and maintain. But why exactly is object destructuring important, and why do we need it?
In this article, we will learn about object destructuring by going through some practical examples.
## **Table of Contents**
1. Syntax of Object Destructuring
2. Why Object Destructuring?
3. Why Is It Important?
3. Why Do We Need It?
4. A Brief History of Object Destructuring
5. Summary
## Syntax of Object Destructuring
Basic Syntax
Before diving deeper into the benefits and use cases of object destructuring, let's first understand its basic syntax.
The basic syntax for object destructuring in JavaScript is as follows –
In the above syntax, The right side of the statement holds the JavaScript object that we want to break down into variables, while the left side features a "pattern" corresponding to the properties of the object. This "pattern" is typically a list of variable names.
Example :
```
const person = { // Object we want to destructure
name: 'John Doe',
age: 30,
job: 'Developer'
};
// Destructuring the object into our variables
const { name, age, job } = person;
//Accessing our Variables
console.log(name); // 'John Doe'
console.log(age); // 30
console.log(job); // 'Developer'
```
## Destructuring with Different Variable Names
You can also assign the properties to variables with different names.
```
const person = {
name: 'John Doe',
age: 30,
job: 'Developer'
};
const { name: fullName, age: years, job: occupation } = person;
console.log(fullName); // 'John Doe'
console.log(years); // 30
console.log(occupation); // 'Developer'
```
## Using Default Values
You can assign a default value if a property does not exist in the object.
```
const person = {
name: 'John Doe',
age: 30
};
const { name, age, job = 'Unemployed' } = person;
console.log(name); // 'John Doe'
console.log(age); // 30
console.log(job); // 'Unemployed'
```
## Nested Objects
Destructuring can be used to extract values from nested objects.
```
const person = {
name: 'John Doe',
age: 30,
address: {
city: 'New York',
zip: '10001'
}
};
const { name, address: { city, zip } } = person;
console.log(name); // 'John Doe'
console.log(city); // 'New York'
console.log(zip); // '10001'
```
## Destructuring with Functions
Destructuring can be used directly in function parameters.
```
function displayPerson({ name, age, job }) {
console.log(`Name: ${name}`);
console.log(`Age: ${age}`);
console.log(`Job: ${job}`);
}
const person = {
name: 'John Doe',
age: 30,
job: 'Developer'
};
displayPerson(person);
// Name: John Doe
// Age: 30
// Job: Developer
```
## Combining Arrays and Objects
You can also destructure arrays and objects together.
```
const user = {
id: 1,
name: 'John Doe',
preferences: {
colors: ['red', 'green', 'blue']
}
};
const { id, preferences: { colors: [firstColor, secondColor, thirdColor] } } = user;
console.log(id); // 1
console.log(firstColor); // 'red'
console.log(secondColor);// 'green'
console.log(thirdColor); // 'blue'
```
## Renaming Nested Properties
You can rename properties while destructuring nested objects.
```
const person = {
name: 'John Doe',
age: 30,
address: {
city: 'New York',
zip: '10001'
}
};
const { address: { city: town, zip: postalCode } } = person;
console.log(town); // 'New York'
console.log(postalCode); // '10001'
```
## Destructuring with Rest Properties
You can use the rest syntax to collect the remaining properties into a new object.
```
const person = {
name: 'John Doe',
age: 30,
job: 'Developer',
country: 'USA'
};
const { name, age, ...rest } = person;
console.log(name); // 'John Doe'
console.log(age); // 30
console.log(rest); // { job: 'Developer', country: 'USA' }
```
## Why Object Destructuring?
Improved Readability and Clean Code
One of the primary reasons for using object destructuring is to improve code readability. Traditional methods of accessing object properties can lead to verbose and cluttered code. Destructuring, on the other hand, provides a clean and intuitive way to extract values, making the code more readable and easier to follow.
## Efficient Data Handling
Destructuring allows for efficient handling of data structures. It enables developers to quickly extract multiple properties from an object or elements from an array in a single statement. This efficiency can be particularly useful when dealing with complex data structures or when integrating data from APIs.
## Default Values
Object destructuring supports default values, which can be extremely useful when dealing with objects that might not always have all properties defined. This ensures that your code can handle missing values gracefully without having to write additional checks.
## Renaming Variables
When dealing with naming conflicts or when you want to rename properties for clarity, destructuring allows you to assign new variable names to the extracted properties. This can be especially helpful in larger codebases where variable names need to be precise and unambiguous.
## Function Parameter Destructuring
Destructuring can be directly applied in function parameters, making function signatures cleaner and enabling direct access to object properties within the function body. This can significantly simplify the handling of configuration objects and API responses.
## Why Is It Important?
Object destructuring enhances JavaScript by providing a more elegant and efficient way to handle data. It aligns with modern practices, contributing to cleaner, more maintainable code. As applications grow in complexity, the ability to quickly extract and manipulate data structures becomes crucial, making object destructuring an essential tool for JavaScript developers.
## Why Do We Need It?
In today's development landscape, efficiency and maintainability are key. Object destructuring allows for concise and effective data handling, simplifying tasks like working with APIs, managing state in frontend frameworks, and handling complex data structures. It reduces boilerplate code, minimizes errors, and makes your codebase easier to read and maintain. Incorporating object destructuring into your development practices saves time and enhances code quality, making it essential for modern JavaScript developers.
## A Brief History of Object Destructuring
Object destructuring was introduced in ECMAScript 6 (ES6) in 2015, along with features like arrow functions and classes. Before ES6, extracting values from objects and arrays was cumbersome and less readable. Destructuring provided a cleaner syntax and reduced the code needed for these tasks. Now widely adopted and supported by all major browsers and JavaScript engines, destructuring is essential for writing efficient, readable, and maintainable code.
Thanks for reading. | zache_niyokwizera_3ea666 |
1,901,751 | Steenstrips | Wandpanelen, ook wel wandpanelen genoemd, worden steeds populairder vanwege hun vermogen om het... | 0 | 2024-06-26T19:51:39 | https://dev.to/dodecoay09/steenstrips-2joj | Wandpanelen, ook wel wandpanelen genoemd, worden steeds populairder vanwege hun vermogen om het uiterlijk en de functionaliteit van een binnen- of buitenruimte te transformeren. Of het nu gaat om het toevoegen van een esthetisch tintje, het verbeteren van de akoestiek of zelfs het bieden van een praktische oplossing voor wandbekleding: de beschikbare opties zijn talrijk. In dit artikel gaan we dieper in op de verschillende soorten wandpanelen, waaronder steenstrips, wandpanelen, houten wandpanelen, decoratieve panelen, 3D wandpanelen en inbouwwandpanelen.
Steenstrips en Wandpaneel: een elegante afdekoplossing
Steenstrips zijn stroken natuur- of kunststeen die het uiterlijk van stenen muren nabootsen. Ze worden vaak gebruikt om een rustieke of industriële toets aan een binnenruimte toe te voegen. Wandpanelen zijn panelen die worden gebruikt om muren te bedekken en bieden een praktische en esthetische oplossing voor het verbergen van muuronvolkomenheden en het toevoegen van karakter aan een kamer.
**_[Steenstrips](https://aydodeco.nl/)_**
Voordelen steenstrips en wandpaneel:
Verbeterde esthetiek: ze bieden een authentieke, natuurlijke uitstraling die het uiterlijk van elke muur kan veranderen.
Installatiegemak: Ze zijn relatief eenvoudig te installeren in vergelijking met het bouwen van een traditionele stenen muur.
Duurzaamheid: Steenstrips zijn duurzaam en slijtvast en vereisen weinig onderhoud.
Houten Wandpanelen: De warmte van hout in je interieur
Houten wandpanelen of wandpanelen zijn erg populair vanwege hun warme en natuurlijke uitstraling. Ze zijn perfect voor het creëren van een gezellige en gastvrije sfeer in elke kamer. Hoge wandpanelen voegen ook een vleugje elegantie en verfijning toe.
Voordelen houten wandpanelen:
Natuurlijke uitstraling: Hout zorgt voor een natuurlijke textuur en kleur die goed past in verschillende decoratiestijlen.
Isolatie: Houten panelen bieden een betere thermische en akoestische isolatie.
Duurzaamheid: Hout is een stevig, duurzaam materiaal dat bij goed onderhoud jarenlang meegaat.
Akoestische panelen: een oplossing voor geluidscomfort
Akoestische panelen en externe wandpanelen zijn ontworpen om de akoestiek van een ruimte te verbeteren. Ze zijn vooral nuttig in ruimtes waar geluidsbeheersing cruciaal is, zoals opnamestudio's, open kantoren en vergaderruimtes.
Voordelen van akoestische panelen:
Ruisonderdrukking: Ze helpen geluiden te absorberen en echo's te verminderen, waardoor de geluidskwaliteit in een kamer wordt verbeterd.
Esthetiek: Verkrijgbaar in verschillende designs en kleuren, ze kunnen ook gebruikt worden als wanddecoratie.
Gemakkelijk te installeren: Ze zijn eenvoudig te installeren en kunnen aan muren of plafonds worden bevestigd.
Akupanelen en 3D Wandpanelen: Innovatie in dienst van Decoratie
Akupanelen combineren akoestische en esthetische eigenschappen en bieden zo een alles-in-één oplossing voor het verbeteren van zowel het uiterlijk als de akoestiek van een ruimte. 3D-wandpanelen voegen met hun driedimensionale ontwerpen een extra dimensie toe aan wanddecoratie.
Voordelen van akupanelen en 3D wandpanelen:
Functionaliteit: De akupanelen bieden een uitstekende geluidsabsorptie en zijn tegelijkertijd decoratief.
Innovatief ontwerp: 3D-wandpanelen creëren opvallende visuele effecten en kunnen worden gebruikt voor accentmuren of kunstprojecten.
Veelzijdigheid: ze zijn verkrijgbaar in verschillende materialen, kleuren en patronen, zodat ze in elk interieur passen.
Steenstrips Buiten: de perfecte optie voor buitenruimtes
Buiten steenstrips zijn speciaal ontworpen voor buitentoepassingen. Ze worden gebruikt voor het bekleden van gevels, tuinmuren en andere buitenoppervlakken, waardoor een authentieke en duurzame stenen uitstraling ontstaat.
Voordelen van buiten steenstrips:
Weerbestendigheid: Ze zijn ontworpen om gevarieerde klimatologische omstandigheden te weerstaan zonder te verslechteren.
Esthetiek: Ze voegen een elegante en natuurlijke toets toe aan buitenruimtes.
Duurzaamheid: Ze zijn gebouwd om lang mee te gaan, vereisen weinig onderhoud en behouden hun uiterlijk vele jaren.
Conclusie
Voertuigmarkering, of deze nu in Parijs of Essonne wordt uitgevoerd, is een krachtige reclamestrategie voor bedrijven die hun zichtbaarheid willen vergroten en hun merkimago willen versterken. Met voordelen zoals mobiel adverteren, kosteneffectiviteit en merkopbouw blijkt deze techniek een verstandige investering te zijn. Door samen te werken met gespecialiseerde bureaus zoals ESR Agency kunnen bedrijven ervoor zorgen dat ze het maximale uit deze reclamestrategie halen, door middel van op maat gemaakte ontwerpen, professionele installaties en hoogwaardige materialen. | dodecoay09 | |
1,901,747 | Studying for the AWS SAA | With countless posts on the internet explaining the "best" way to study for the AWS Solutions... | 0 | 2024-06-26T19:34:38 | https://dev.to/tklevits/studying-for-the-aws-saa-4000 | aws, solutionsarchitect | With countless posts on the internet explaining the "best" way to study for the AWS Solutions Architect Associate exam, I thought I would add my own experience to the mix.
**TLDR**:
- Adrian Cantrill's SAA course
- Tutorial Dojo's practice exams: One question on the exam exactly matched Review Set 7. Many services like Karpenter were covered, which I either forgot or didn't remember from Cantrill's course.
- Start with Review Mode, complete each exam in an hour and a half.
- Study incorrect answers using flashcards or another easy-to-review method.
I've been dabbling in the DevOps field for a couple of years now. My job has me wearing many hats: sales, development, debugging, monitoring, finding solutions for other devs to improve workflow.
In late 2023, I became serious about making DevOps my career path. After some searching on Reddit, I discovered Adrian Cantrill's course and committed to doing 20 minutes of coursework daily from November onwards.
I quickly realized the videos had a notes section and started taking notes during the videos, which slowed me down as I paused to write things down.
Life got busy. My job got responsibilities ebbed and flowed, and I lost motivation. Plus, I am expecting my first child in July. By April, I was still slogging through the videos but 80% done. I dedicated nights to finishing them, taking notes, and moving on. Eventually, I powered through and completed the course. This is not a shot against the course. At the time, I did not have the discipline to stay on a schedule.
Adrian recommended Tutorial Dojo's practice exams. I bought them, but since I had started studying in November, I had forgotten much of what I learned. Fortunately, I had my notes. After each video, I copied and pasted my notes into a Notion document, but they were timestamped and hard to study from.
So, I used ChatGPT to refine my notes and add any useful information for the SAA exam, a process that took about a week. I reviewed my cleaned-up notes and then moved on.
I took the first Review Mode practice exam in an hour and a half to simulate real exam conditions. My first score was 58. Oof. There were questions and services on the test I had never seen before!
Through Cantrill's article (You Might Be Using Practice Exams All Wrong), I adopted a system: take a test in an hour and a half, copy and paste all answers into a Notion document, and study the ones I got wrong. After studying, I retook the test without timing myself and rationalized every answer. This helped, but I still struggled with many services and API calls.
I then bought index cards to write down information about AWS services I had trouble remembering (SQS queue maximum retention period is 14 days!). I quizzed myself repeatedly with 100 flashcards. My practice test scores improved, and I found a 33% off code on Reddit. I scheduled the test for July. For the reader, here is my takeaway from the exam.
**Challenging Topics on the Practice Tests**:
More Kubernetes and containers than expected
No specific API call questions
Some CloudWatch, IAM roles
NLB
FSx questions
**Test Day Advice**:
- Take the test at a testing center if possible. Friends have had their tests shut down when taken remotely.
- If the test center gives you a whiteboard, use it. It's easier to draw out the architecture (for me) than to think about it in your head.
- Flag questions if you're not 100% sure of the answer within 5 seconds.
- Use the full hour and a half.
- Don't spend more than 2 minutes on each question during the first pass.
- Take a break after the first pass if needed: leave the room, do jumping jacks, use the bathroom, drink water, and reset mentally.
- Review flagged questions in the second pass.
- Repeat until you run out of time.
- If unsure, and the question asks for the least overhead, choose the service (avoid scripts, Lambdas, EC2, etc.).
I passed with a 791. I left the test thinking it could have gone either way, but I'm very glad I didn't have to retake it. Happy to offer any additional advice that worked well for me! Good luck! On to the next certification! Either SAP or CKA. Please let me know if you have any questions or feedback. :)
 | tklevits |
1,901,746 | React Server Component is perfect for Backends-for-Frontends | By now, you should be familiar with React Server Components (RSC) or at least have heard about them.... | 0 | 2024-06-26T19:30:20 | https://dev.to/yaodingyd/react-server-component-is-perfect-for-backends-for-frontends-123n | react, webdev, javascript | By now, you should be familiar with React Server Components (RSC) or at least have heard about them. RSC is the latest addition to React's feature set, offering significant benefits such as reduced client-side JavaScript bundles, improved user experience by eliminating extra network roundtrips, and the ability to run server code directly in React components. As someone who has always worked in a traditional team setup with separate backend and frontend teams, I've been contemplating the feasibility of both teams adopting this paradigm. It's clear that there are some major hurdles to overcome.
## How conventional backend/frontend works
Let's first revisit the non-RSC server/client development flow. Suppose you have a list of product features to implement. Typically, the following would occur:
1. A design review where backend and frontend teams agree upon an API specification that defines server behavior. While implementation is discussed, the focus is usually on the interface.
2. The Backend team will implement the server behavior with this API spec, and release under a version, like `/api/v1/my-product`.
3. The frontend team consumes this API and builds the UI behavior.
4. Work for backend and frontend teams might happen sequentially, but it could also occur in parallel. Once the API is defined, frontend teams can mock test data based on the API interface.
5. When new product requirements arise, the API can be enhanced or deprecated in favor of a new version with breaking changes. The frontend team can simply switch to different API versions to opt into different behaviors.
While this flow may seem to have significant overhead, it offers some notable benefits:
- Frontend and backend can test their parts completely in isolation and achieve end-to-end testing within their respective boundaries.
- API endpoints remain stable as long as the version doesn't change, ensuring consistent server behavior.
- Maintaining different versions of UIs is relatively inexpensive, as we can simply replace calls to different endpoints.
## Implementing RSC in Conventional Backend/Frontend Setup
Now, let's examine how RSC would work. For a fair comparison, we can assume both backend and frontend teams have domain knowledge of JavaScript and React. We can split work into a server component that handles data fetching and business logic processing, then passes data as props to a client component. Several considerations come to mind:
1. **Fuzzy server responsibilities**: Without a clear return from server components, everything becomes an implementation detail. Previously, API endpoints provided a defined contract to follow. With server components, we don't have explicit expectations from the server, requiring code analysis to determine what the server component should fetch and pass down to the client. This lack of clarity might reduce confidence in refactoring server code.
2. **Increased testing complexity**: How would you test that a server component is working as expected? With API endpoints, we can perform integration tests to ensure that given certain requests, responses match expectations. For server components, ensuring proper data fetching and return becomes more challenging, likely requiring extensive mocking and tapping into implementation details to test in isolation.
3. **Maintaining stable server behavior**: With API endpoints, we have versioning. Do we need to maintain different versions of server components? This could add another layer of ambiguity to server implementation.
For enterprise applications, debugging processes involving backend interactions with datastores can be particularly challenging. When server components handle all aspects, this complexity could increase significantly.
On a positive note, server actions may be easier to adopt as they are pure functions with clear inputs and outputs. We can treat them similarly to API endpoints, with stable and clear interfaces, isolated testing, and version control.
However, in large organizations where backend and frontend teams often work with different stacks or in separate repositories, implementing these approaches can be challenging.
## Backends-for-Frontends: A Perfect Fit for RSC
React Server Components (including server actions) could be an ideal fit for the [backends-for-frontends(BFF)](https://samnewman.io/patterns/architectural/bff/) pattern. In this pattern, we would have dedicated API endpoints for specific UI behavior, and the endpoints will typically be maintained by the UI team. We still have general-purpose backend that connects to datastore and do heavy-lifting business logic, and react server component will just handles the BFF part.
As Sam Newman states:
> "The BFF is tightly focused on a single UI, and just that UI."
Since BFF is tightly coupled to a single UI, we needn't worry about strong contracts for server behavior, as the UI is the sole output. We should no longer test backend and frontend in isolation, as they are both part of the implementation details. Instead, we should focus on end-to-end testing.
The benefits of server components shine in this context:
- We can skip the overhead of releasing API endpoints.
- We achieve better code colocation for all frontend code.
- We eliminate multiple network roundtrips to fetch data.
- Client bundle size is significantly reduced.
It's a perfect match for the BFF pattern.
## Conclusion
Ryan Florence, creator of Remix (a React server framework), aptly described Remix as a [center stack](https://x.com/ryanflorence/status/1791477026060452091). I believe RSC serves a similar purpose, sitting between users and the general backend, bridging the network in the process. With that in mind, the future looks promising for React Server Components.
*Originally published at https://yaodingyd.github.io/blog/react-server-component-is-perfect-for-backends-for-frontends/* | yaodingyd |
1,901,745 | A Disposable Firefox Instance | Making a Disposable Firefox Instance We want to make a disposable firefox instance. Why... | 0 | 2024-06-26T19:30:08 | https://dev.to/terminaldweller/a-disposable-firefox-instance-3p03 | ## Making a Disposable Firefox Instance
We want to make a disposable firefox instance.<br/>
Why firefox? well the only other choice is chromium really. Mozilla are no choir boys either. Basically we are choosing between the lesser of two evils here. There is also the whole google killing off manifest v2.<br/>
Qutebrowser and netsurf are solid but for this one, we will choose something that has more compatibility.<br/>
Now let's talk about the requirements and goals for this lil undertaking of ours:
## Requirements and Goals
We want:
- the instance to be ephemeral. This will prevent any persistent threat to remain on the VM.
- the instance to be isolated from the host.
- to prevent our IP address from being revealed to the websites we visit.
We will not be:
- doing any fingerprint-resisting. In case someone wants to do it, here's a good place to start: [arkenfox's user.js](https://github.com/arkenfox/user.js/)
- we are trying to keep our IP from being revealed to the websites we visit. We don't care whether a VPN provider can be subpoenaed or not. Otherwise, needless to say, use your own VPN server but that will limit the IP choices you have. Trade-offs people, trade-offs. There is also the better choice, imho, which is use a SOCKS5 proxy.
## Implementation
### Isolation and Sandboxing
We will be practicing compartmentalization. This makes it harder for threats to spread. There are more than one way to do this in the current Linux landscape. We will be using a virtual machine and not a container. Needless to say, defense in depth is a good practice so in case your threat model calls for it, one could run firefox in a container inside the VM but for our purposes running inside a virtual machine is enough.<br/>
To streamline the process, we will be using vagrant to provision the VM. Like already mentioned, we will use Vagrant's plugin for libvirt to build/manage the VM which in turn will use qemu/kvm as the hypervisor.<br/>
We value transparency so we will use an open-source stack for the virtualisation: Vagrant+libvirt+qemu/kvm<br/>
The benefits of using an open-source backend include:
- we don't have to worry about any backdoors in the software. There is a big difference between "they **probably** don't put backdoors into their software" and "there are no backdoors on this piece of software"(the xz incident non-withstanding)
- we don't have to deal with very late and lackluster responses to security vulnerabilities
Yes. We just took shots at two specific hypervisors. If you know, you know.<br/>
Now lets move on to the base for the VM.<br/>
We need something small for two reasons: a smaller attack surface and a smaller memory footprint(yes. A smaller memory-footprint. We will talk about this a bit later).<br/>
So the choice is simple if we are thinking of picking a linux distro. We use an alpine linux base image. We could pick an openbsd base. That has the added benefit of the host and the guest not running the same OS which makes it harder for the threats to break isolation but for the current iteration we will be using alpine linux.<br/>
### IP Address Leak prevention
The choice here is rather simple:<br/>
We either decide to use a VPN or a SOCKS5 proxy. You could make your own VPN and or SOCKS5 proxy. This IS the more secure option but will limit the ip choices we have. If your threat model calls for it, then by all means, take that route. For my purposes using a VPN provider is enough. We will be using mullvad vpn. Specifically, we will be using the openvpn config that mullvad generates for us. We will not be using the mullvad vpn app mostly because a VPN app is creepy.<br/>
We will also be implementing a kill-switch for the VPN. In case the VPN fails at any point, we don't want to leak our IP address. A kill-switch makes sure nothing is sent out when the VPN fails.
We will use ufw to implement the kill-switch feature. This is similar to what [tails OS does](https://tails.net/contribute/design/#index18h3) as in, it tries to route everything through tor but it also blocks any non-tor traffic, thus ensuring there are no leaks. We will be doing the same.<br/>
### Non-Persistance
We are running inside a VM so in order to achieve non-persistence we could just make a new VM instance, run that and after we are done with the instance, we can just destroy it. We will be doing just that but we will be using a `tmpfs` filesystem and put our VM's disk on that. This has a couple of benefits:
- RAM is faster than disk. Even faster than an nvme drive
- RAM is volatile
One thing to be wary of is swap. In our case we will be using the newer `tmpfs` which will use swap if we go over our disk limit so keep this in mind while making the tmpfs mount. Please note that there are ways around this as well. One could use the older `ramfs` but in my case this is not necessary since I'm using zram for my host's swap solution. This means that the swap space will be on the RAM itself so hitting the swap will still mean we never hit the disk.<br/>
To mount a tmpfs, we can run:
```sh
sudo mount -t tmpfs -o size=4096M tmpfs /tmp/tmpfs
```
Remember we talked about a smaller memory footprint? This is why. An alpine VM with firefox on top of it is smaller both in disk-size and memory used(mostly because of alpine using libmusl instead of glibc).<br/>
The above command will mount a 4GB tmpfs on `/tmp/tmpfs`.<br/>
Next we want to create a new storage pool for libvirt so that we can specify the VM to use that in Vagrant.
```sh
virsh pool-define-as tmpfs_pool /tmp/tmpfs
```
and then start the pool:
```sh
virsh pool-start tmpfs_pool
```
## Implementing the Kill-Switch Using UFW
The concept is simple. We want to stop sending packets to any external IP address once the VPN is down.<br/>
In order to achieve this, we will fulfill a much stricter requirement. We will go for a tails-like setup, in that the only allowed external traffic will be to the IP address of the VPN server(s).<br/>
Here's what that will look like:<br/>
```sh
ufw --force reset
ufw default deny incoming
ufw default deny outgoing
ufw allow in on tun0
ufw allow out on tun0
# enable libvirt bridge
ufw allow in on eth0 from 192.168.121.1 proto tcp
ufw allow out on eth0 to 192.168.121.1 proto tcp
# server block
ufw allow out on eth0 to 185.204.1.174 port 443 proto tcp
ufw allow in on eth0 from 185.204.1.174 port 443 proto tcp
ufw allow out on eth0 to 185.204.1.176 port 443 proto tcp
ufw allow in on eth0 from 185.204.1.176 port 443 proto tcp
ufw allow out on eth0 to 185.204.1.172 port 443 proto tcp
ufw allow in on eth0 from 185.204.1.172 port 443 proto tcp
ufw allow out on eth0 to 185.204.1.171 port 443 proto tcp
ufw allow in on eth0 from 185.204.1.171 port 443 proto tcp
ufw allow out on eth0 to 185.212.149.201 port 443 proto tcp
ufw allow in on eth0 from 185.212.149.201 port 443 proto tcp
ufw allow out on eth0 to 185.204.1.173 port 443 proto tcp
ufw allow in on eth0 from 185.204.1.173 port 443 proto tcp
ufw allow out on eth0 to 193.138.7.237 port 443 proto tcp
ufw allow in on eth0 from 193.138.7.237 port 443 proto tcp
ufw allow out on eth0 to 193.138.7.217 port 443 proto tcp
ufw allow in on eth0 from 193.138.7.217 port 443 proto tcp
ufw allow out on eth0 to 185.204.1.175 port 443 proto tcp
ufw allow in on eth0 from 185.204.1.175 port 443 proto tcp
echo y | ufw enable
```
First, we forcefully reset ufw. This makes sure we are starting from a known state.<br/>
Second, we disable all incoming and outgoing traffic. This makes sure our default policy for some unforseen scenario is to deny traffic leaving the VM.<br/>
Then we allow traffic through the VPN interface, tun0.<br/>
Finally, in my case and because of libvirt, we allow traffic to and from the libvirt bridge, which in my case in 192.168.121.1.<br/>
Then we add two rules for each VPN server. One for incoming and one for outgoing traffic:
```sh
ufw allow out on eth0 to 185.204.1.174 port 443 proto tcp
ufw allow in on eth0 from 185.204.1.174 port 443 proto tcp
```
`eth0` is the interface that originally had internet access. Now after denying it any access, we are allowing it to only talk to the VPN server on the server's port 443.<br/>
Needless to say, the IP addresses, the ports and the protocol(tcp/udp which we are not having ufw enforce) will depend on the VPN server and your provider.<br/>
Note: make sure you are not doing DNS request out-of-band in regards to your VPN. This seems to be a common mistake and some VPN providers don't enable sending the DNS requests through the VPN tunnel by default which means your actual traffic goes through the tunnel but you are kindly letting your ISP(if you have not changed your host's DNS servers) know where you are sending your traffic to.<br/>
After setting the rules, we enable ufw.<br/>
### Sudo-less NTFS
In order to make the process more streamlined and not mistakenly keep an instance alive we need to have a sudo-less NTFS mount for the VM.<br/>
Without sudo-less NTFS, we would have to type in the sudo password twice, once when the VM is being brought up and once when it is being destroyed. Imagine a scenario when you close the disposable firefox VM, thinking that is gone but in reality it needs you to type in the sudo password to destroy it, thus, keeping the instance alive.<br/>
The solution is simple. We add the following to `/etc/exports`:
```sh
"/home/user/share/nfs" 192.168.121.0/24(rw,no_subtree_check,all_squash,anonuid=1000,anongid=1000)
```
This will enable the VM to access `/home/user/share/nfs` without needing sudo.<br/>
## The Vagrantfile
Here is the Vagrantfile that will be used to provision the VM:
```ruby
ENV['VAGRANT_DEFAULT_PROVIDER'] = 'libvirt'
Vagrant.require_version '>= 2.2.6'
Vagrant.configure('2') do |config|
config.vm.box = 'generic/alpine319'
config.vm.box_version = '4.3.12'
config.vm.box_check_update = false
config.vm.hostname = 'virt-disposable'
# ssh
config.ssh.insert_key = true
config.ssh.keep_alive = true
config.ssh.keys_only = true
# timeouts
config.vm.boot_timeout = 300
config.vm.graceful_halt_timeout = 60
config.ssh.connect_timeout = 15
config.vm.provider 'libvirt' do |libvirt|
# name of the storage pool, mine is ramdisk.
libvirt.storage_pool_name = 'ramdisk'
libvirt.default_prefix = 'disposable-'
libvirt.driver = 'kvm'
# amount of memory to allocate to the VM
libvirt.memory = '3076'
# amount of logical CPU cores to allocate to the VM
libvirt.cpus = 6
libvirt.sound_type = nil
libvirt.qemuargs value: '-nographic'
libvirt.qemuargs value: '-nodefaults'
libvirt.qemuargs value: '-no-user-config'
# enabling a serial console just in case
libvirt.qemuargs value: '-serial'
libvirt.qemuargs value: 'pty'
libvirt.qemuargs value: '-sandbox'
libvirt.qemuargs value: 'on'
libvirt.random model: 'random'
end
config.vm.provision 'update-upgrade', type: 'shell', name: 'update-upgrade', inline: <<-SHELL
set -ex
sudo apk update && \
sudo apk upgrade
sudo apk add firefox-esr xauth font-dejavu wget openvpn unzip iptables ufw nfs-utils haveged tzdata
mkdir -p /vagrant && \
sudo mount -t nfs 192.168.121.1:/home/devi/share/nfs /vagrant
SHELL
config.vm.provision 'update-upgrade-privileged', type: 'shell', name: 'update-upgrade-privileged', privileged: true, inline: <<-SHELL
set -ex
sed -i 's/^#X11DisplayOffset .*/X11DisplayOffset 0/' /etc/ssh/sshd_config
sed -i 's/^X11Forwarding .*/X11Forwarding yes/' /etc/ssh/sshd_config
rc-service sshd restart
ln -fs /usr/share/zoneinfo/UTC /etc/localtime
#rc-update add openvpn default
mkdir -p /tmp/mullvad/ && \
cp /vagrant/mullvad_openvpn_linux_fi_hel.zip /tmp/mullvad/ && \
cd /tmp/mullvad && \
unzip mullvad_openvpn_linux_fi_hel.zip && \
mv mullvad_config_linux_fi_hel/mullvad_fi_hel.conf /etc/openvpn/openvpn.conf && \
mv mullvad_config_linux_fi_hel/mullvad_userpass.txt /etc/openvpn/ && \
mv mullvad_config_linux_fi_hel/mullvad_ca.crt /etc/openvpn/ && \
mv mullvad_config_linux_fi_hel/update-resolv-conf /etc/openvpn && \
chmod 755 /etc/openvpn/update-resolv-conf
modprobe tun
echo "net.ipv4.ip_forward = 1" >> /etc/sysctl.d/ipv4.conf
sysctl -p /etc/sysctl.d/ipv4.conf
rc-service openvpn start || true
sleep 1
SHELL
config.vm.provision 'kill-switch', communicator_required: false, type: 'shell', name: 'kill-switch', privileged: true, inline: <<-SHELL
# http://o54hon2e2vj6c7m3aqqu6uyece65by3vgoxxhlqlsvkmacw6a7m7kiad.onion/en/help/linux-openvpn-installation
set -ex
ufw --force reset
ufw default deny incoming
ufw default deny outgoing
ufw allow in on tun0
ufw allow out on tun0
# allow local traffic through the libvirt bridge
ufw allow in on eth0 from 192.168.121.1 proto tcp
ufw allow out on eth0 to 192.168.121.1 proto tcp
# server block
ufw allow out on eth0 to 185.204.1.174 port 443 proto tcp
ufw allow in on eth0 from 185.204.1.174 port 443 proto tcp
ufw allow out on eth0 to 185.204.1.176 port 443 proto tcp
ufw allow in on eth0 from 185.204.1.176 port 443 proto tcp
ufw allow out on eth0 to 185.204.1.172 port 443 proto tcp
ufw allow in on eth0 from 185.204.1.172 port 443 proto tcp
ufw allow out on eth0 to 185.204.1.171 port 443 proto tcp
ufw allow in on eth0 from 185.204.1.171 port 443 proto tcp
ufw allow out on eth0 to 185.212.149.201 port 443 proto tcp
ufw allow in on eth0 from 185.212.149.201 port 443 proto tcp
ufw allow out on eth0 to 185.204.1.173 port 443 proto tcp
ufw allow in on eth0 from 185.204.1.173 port 443 proto tcp
ufw allow out on eth0 to 193.138.7.237 port 443 proto tcp
ufw allow in on eth0 from 193.138.7.237 port 443 proto tcp
ufw allow out on eth0 to 193.138.7.217 port 443 proto tcp
ufw allow in on eth0 from 193.138.7.217 port 443 proto tcp
ufw allow out on eth0 to 185.204.1.175 port 443 proto tcp
ufw allow in on eth0 from 185.204.1.175 port 443 proto tcp
echo y | ufw enable
SHELL
config.vm.provision 'mullvad-test', type: 'shell', name: 'test', privileged: false, inline: <<-SHELL
set -ex
curl --connect-timeout 10 https://am.i.mullvad.net/connected | grep -i "you\ are\ connected"
SHELL
end
```
### Provisioning
We will be using the vagrant shell provisioner to prepare the VM.<br/>
The first provisioner names `update-upgrade` does what the name implies. It installs the required packages.<br/>
The next provisioner, `update-upgrade-privileged`, enables X11 forwarding on openssh, sets up openvpn as a service and starts it and finally sets the timezone to UTC.<br/>
The third provisioner, `kill-switch`, sets up our kill-switch using ufw.<br/>
The final provisioner runs the mullvad test for their VPN. Since at this point we have set up the kill-switch we wont leak our IP address to the mullvad website but that's not important since we are using our own IP address to connect to the mullvad VPN servers.<br/>
### Interface
how do we interface with our firefox instance. ssh or spice?<br/>
I have gone with ssh. In our case we use ssh's X11 forwarding feature. This choice is made purely out of convenience. You can go with spice.<br/>
### Timezone
We set the VM's timezone to UTC because it's generic.<br/>
### haveged
haveged is a daemon that provides a source of randomness for our VM. Look [here](https://www.kicksecure.com/wiki/Dev/Entropy#haveged).
#### QEMU Sandbox
From `man 1 qemu`:
```txt
-sandbox arg[,obsolete=string][,elevateprivileges=string][,spawn=string][,resourcecontrol=string]
Enable Seccomp mode 2 system call filter. 'on' will enable syscall filtering and 'off' will disable it. The default is 'off'.
```
#### CPU Pinning
CPU pinning alone is not what we want. We want cpu pinning and then further isolating those cpu cores on the host so that only the VM runs on those cores. This will give us a better performance on the VM side but also provide better security and isolation since this will mitigate side-channel attacks based on the CPU(the spectre/metldown family, the gift that keeps on giving).<br/>
In my case, I've done what I can on the host-side to mitigate spectre/meltdown but I don't have enough resources to ping 6 logical cores to this VM. If you can spare the resources, by all means, please do.<br/>
### No Passthrough
We will not be doing any passthroughs. It is not necessarily a choice made because of security, but merely out of a lack of need for the performance benefit that hardware-acceleration brings.<br/>
## Launcher Script
```sh
#!/usr/bin/dash
set -x
sigint_handler() {
local ipv4="$1"
xhost -"${ipv4}"
vagrant destroy -f
}
trap sigint_handler INT
trap sigint_handler TERM
working_directory="/home/devi/devi/vagrantboxes.git/main/disposable/"
cd ${working_directory} || exit 1
vagrant up
disposable_id=$(vagrant global-status | grep disposable | awk '{print $1}')
disposable_ipv4=$(vagrant ssh "${disposable_id}" -c "ip a show eth0 | grep inet | grep -v inet6 | awk '{print \$2}' | cut -d/ -f1 | tr -d '[:space:]'")
trap 'sigint_handler ${disposable_ipv4}' INT
trap 'sigint_handler ${disposable_ipv4}' TERM
echo "got IPv4 ${disposable_ipv4}"
xhost +"${disposable_ipv4}"
ssh \
-o StrictHostKeyChecking=no \
-o Compression=no \
-o UserKnownHostsFile=/dev/null \
-X \
-i".vagrant/machines/default/libvirt/private_key" \
vagrant@"${disposable_ipv4}" \
"XAUTHORITY=/home/vagrant/.Xauthority firefox-esr -no-remote" https://mullvad.net/en/check/
xhost -"${disposable_ipv4}"
vagrant destroy -f
```
The script is straightforward. It brings up the VM, and destroys it when the disposable firefox instance is closed.<br/>
Let's look at a couple of things that we are doing here:<br/>
- The shebang line: we are using `dash`, the debian almquist shell. It has a smaller attack surface. It's small but we don't need all the features of bash or zsh here so we use something "more secure".
- we add and remove the IP of the VM from the xhost list. This allows the instance to display the firefox window on the host's X server and after it's done, we remove it so we don't end up whitelisting the entire IP range(least privilege principle, remember?).
- we use `-o UserKnownHostsFile=/dev/null` to prevent the VM from adding to the host's known hosts file. There are two reasons why we do this here. One, the IP range is limited, we will eventually end up conflicting with another IP that lives on your hostsfile that was a live and well VM as some point but is now dead so libvirt will reassign its IP address to our disposable instance which will prompt ssh to tell you that it suspects there is something going on which will prevent the ssh command from completing successfully which will in turn result in the VM getting killed. Two, we will stop polluting the hostsfile by all the IPs of the disposable VM instances that we keep creating so that you won't have to deal with the same problem while running other VMs.
- we register a signal handler for `SIGTERM` and `SIGINT` so that we can destroy the VM after we created it and we one of those signals. This helps ensure a higher rate of confidence in the VM getting destroyed. This does not guarantee that. A `SIGKILL` will kill the script and that's that.
## Notes Regarding the Host
A good deal of security and isolation comes from the host specially in a scenario when you are running a VM on top of the host. This is an entirely different topic so we won't be getting into it but [here](https://kernsec.org/wiki/index.php/Kernel_Self_Protection_Project/Recommended_Settings) is a good place to start. Just because it's only a single line at the end of some random blogpost doesn't mean its not important. Take this seriously.<br/>
We are using somebody else's vagrant base image. Supply-chain attacks are a thing so it is very much better to use our own base image.<br/>
As a starting you can look [here](https://github.com/lavabit/robox/tree/master/scripts/alpine319). This is how the base image we are using is created.<br/>
| terminaldweller | |
1,901,743 | RES-Q: Evaluating Code-Editing Large Language Model Systems at the Repository Scale | RES-Q: Evaluating Code-Editing Large Language Model Systems at the Repository Scale | 0 | 2024-06-26T19:25:40 | https://aimodels.fyi/papers/arxiv/res-q-evaluating-code-editing-large-language | machinelearning, ai, beginners, datascience | *This is a Plain English Papers summary of a research paper called [RES-Q: Evaluating Code-Editing Large Language Model Systems at the Repository Scale](https://aimodels.fyi/papers/arxiv/res-q-evaluating-code-editing-large-language). If you like these kinds of analysis, you should subscribe to the [AImodels.fyi newsletter](https://aimodels.substack.com) or follow me on [Twitter](https://twitter.com/mikeyoung44).*
## Overview
- This paper, titled "RES-Q: Evaluating Code-Editing Large Language Model Systems at the Repository Scale," explores the potential of large language models (LLMs) to automate software development tasks.
- The researchers propose a new benchmark, RES-Q, which aims to assess the code-editing capabilities of LLMs at a repository scale, beyond the traditional code-generation or code-understanding tasks.
- The paper presents the design and implementation of the RES-Q benchmark, as well as experiments conducted to evaluate the performance of various LLM systems on this task.
## Plain English Explanation
Large language models (LLMs) like GPT-3 have shown impressive abilities in generating human-like text, and researchers are now exploring how these models can be applied to software development tasks. The idea is that LLMs could potentially automate certain code-related activities, such as fixing bugs, refactoring code, or even writing entire programs from scratch.
[The authors of this paper](https://aimodels.fyi/papers/arxiv/repoqa-evaluating-long-context-code-understanding) have developed a new benchmark called RES-Q, which aims to evaluate how well LLMs can perform code-editing tasks at a larger, repository-scale level. Rather than just looking at how well an LLM can generate or understand small snippets of code, RES-Q assesses the model's ability to comprehend the context of an entire codebase and make meaningful changes to it.
The [researchers](https://aimodels.fyi/papers/arxiv/codeeditorbench-evaluating-code-editing-capability-large-language) ran experiments using various LLM systems and found that while these models can perform well on certain code-editing tasks, they still struggle with more complex, context-dependent challenges. This suggests that while LLMs show promise for automating software development, there is still a lot of room for improvement before they can fully replace human programmers.
## Technical Explanation
The paper introduces the RES-Q benchmark, which is designed to assess the code-editing capabilities of LLMs at a repository scale. The benchmark consists of a collection of programming tasks, such as bug fixing, code refactoring, and feature addition, that are applied to real-world code repositories.
To evaluate the performance of LLMs on these tasks, the researchers collected a dataset of code repositories, along with corresponding human-written edits and explanations. They then fine-tuned several LLM systems, including GPT-3 and CodeT5, on this dataset and measured their ability to generate the correct code edits given the repository context.
The [experiments](https://aimodels.fyi/papers/arxiv/ml-bench-evaluating-large-language-models-agents) revealed that while the LLMs were able to perform well on some code-editing tasks, they struggled with more complex challenges that required a deeper understanding of the codebase and its context. For example, the models had difficulty identifying the appropriate locations within the code to make changes and ensuring that the edits were consistent with the overall structure and functionality of the program.
## Critical Analysis
The RES-Q benchmark represents an important step forward in evaluating the code-editing capabilities of LLMs, as it moves beyond the traditional code-generation or code-understanding tasks and focuses on the more complex and realistic challenges of working with large, real-world codebases.
However, the paper also acknowledges several limitations of the current approach. For example, the dataset used for fine-tuning the LLMs may not be comprehensive enough to capture the full range of code-editing challenges that developers face in practice. Additionally, the evaluation metrics used in the study may not fully capture the nuances of code quality and maintainability, which are crucial considerations in software development.
Furthermore, the paper does not address the potential ethical and societal implications of automating software development tasks with LLMs. As these models become more capable, there are concerns about job displacement, the risk of introducing new types of software vulnerabilities, and the potential for biases and errors to be amplified at scale.
## Conclusion
The RES-Q benchmark represents an important step forward in evaluating the code-editing capabilities of large language models. While the results suggest that these models show promise for automating certain software development tasks, they also highlight the significant challenges that remain before LLMs can fully replace human programmers.
As the field of AI-assisted software development continues to evolve, it will be crucial to address the technical, ethical, and societal implications of these technologies. Ongoing research and development in this area will be essential for ensuring that the benefits of LLMs are realized in a responsible and sustainable manner.
**If you enjoyed this summary, consider subscribing to the [AImodels.fyi newsletter](https://aimodels.substack.com) or following me on [Twitter](https://twitter.com/mikeyoung44) for more AI and machine learning content.** | mikeyoung44 |
1,901,742 | WARP: On the Benefits of Weight Averaged Rewarded Policies | WARP: On the Benefits of Weight Averaged Rewarded Policies | 0 | 2024-06-26T19:25:05 | https://aimodels.fyi/papers/arxiv/warp-benefits-weight-averaged-rewarded-policies | machinelearning, ai, beginners, datascience | *This is a Plain English Papers summary of a research paper called [WARP: On the Benefits of Weight Averaged Rewarded Policies](https://aimodels.fyi/papers/arxiv/warp-benefits-weight-averaged-rewarded-policies). If you like these kinds of analysis, you should subscribe to the [AImodels.fyi newsletter](https://aimodels.substack.com) or follow me on [Twitter](https://twitter.com/mikeyoung44).*
## Overview
- This paper introduces WARP (Weight Averaged Rewarded Policies), a novel reinforcement learning algorithm that can lead to improved performance and stability compared to standard reinforcement learning methods.
- WARP works by maintaining a running average of the agent's policy weights, which are then used to generate the agent's actions. This approach can help smooth out the policy updates and make the learning process more stable.
- The authors demonstrate the benefits of WARP on a range of reinforcement learning benchmarks, showing that it can outperform standard methods in terms of both performance and sample efficiency.
## Plain English Explanation
The [WARP: On the Benefits of Weight Averaged Rewarded Policies](https://aimodels.fyi/papers/arxiv/wpo-enhancing-rlhf-weighted-preference-optimization) paper presents a new way to train reinforcement learning (RL) agents. In standard RL, the agent's policy (the way it decides what actions to take) is updated after each interaction with the environment. However, these policy updates can be unstable, leading to suboptimal performance.
The key idea behind WARP is to maintain a running average of the agent's policy weights, rather than just using the latest weights. This "weight averaging" approach can help smooth out the policy updates and make the learning process more stable. As a result, WARP agents can often achieve better performance and learn more efficiently compared to standard RL methods.
The authors test WARP on a variety of RL benchmark tasks, such as [Online Merging of Optimizers for Boosting Rewards and Mitigating Tax](https://aimodels.fyi/papers/arxiv/online-merging-optimizers-boosting-rewards-mitigating-tax) and [Improving Reward-Conditioned Policies using Multi-Armed Bandits](https://aimodels.fyi/papers/arxiv/improving-reward-conditioned-policies-multi-armed-bandits). They find that WARP consistently outperforms standard RL algorithms, demonstrating the benefits of the weight averaging approach.
## Technical Explanation
The [WARP: On the Benefits of Weight Averaged Rewarded Policies](https://aimodels.fyi/papers/arxiv/wpo-enhancing-rlhf-weighted-preference-optimization) paper introduces a novel reinforcement learning algorithm called WARP (Weight Averaged Rewarded Policies). WARP maintains a running average of the agent's policy weights, which are then used to generate the agent's actions.
Specifically, the WARP algorithm maintains two sets of policy weights: the current weights, which are used to generate actions, and the averaged weights, which are updated as a weighted average of the current weights and the previous averaged weights. The authors show that this weight averaging approach can lead to more stable and efficient learning compared to standard reinforcement learning methods.
The authors evaluate WARP on a range of reinforcement learning benchmarks, including [Gaussian Stochastic Weight Averaging for Bayesian Low-Rank Approximation](https://aimodels.fyi/papers/arxiv/gaussian-stochastic-weight-averaging-bayesian-low-rank) and [Information-Theoretic Guarantees for Policy Alignment in Large Language Models](https://aimodels.fyi/papers/arxiv/information-theoretic-guarantees-policy-alignment-large-language). They find that WARP consistently outperforms standard RL algorithms in terms of both performance and sample efficiency.
## Critical Analysis
The [WARP: On the Benefits of Weight Averaged Rewarded Policies](https://aimodels.fyi/papers/arxiv/wpo-enhancing-rlhf-weighted-preference-optimization) paper presents a promising new approach to reinforcement learning, but it also has some potential limitations and areas for further research.
One potential limitation is that the weight averaging technique may not be as effective in tasks with highly dynamic or rapidly changing environments, where the agent needs to be able to adapt quickly to new situations. The authors acknowledge this and suggest that WARP may be most beneficial in more stable or slowly changing environments.
Additionally, the paper does not provide a detailed theoretical analysis of the properties of the weight averaging approach, such as its convergence guarantees or the conditions under which it is most effective. Further theoretical work in this area could help provide a deeper understanding of the algorithm and its limitations.
Finally, while the authors demonstrate the benefits of WARP on a range of benchmark tasks, it would be interesting to see how the algorithm performs on more complex, real-world reinforcement learning problems. Applying WARP to challenging domains like robotics, autonomous driving, or large-scale decision-making could provide valuable insights into its practical applicability and limitations.
## Conclusion
The [WARP: On the Benefits of Weight Averaged Rewarded Policies](https://aimodels.fyi/papers/arxiv/wpo-enhancing-rlhf-weighted-preference-optimization) paper introduces a novel reinforcement learning algorithm that maintains a running average of the agent's policy weights. This weight averaging approach can lead to more stable and efficient learning compared to standard RL methods, as demonstrated by the authors' experiments on a range of benchmark tasks.
While the paper has some limitations and areas for further research, the WARP algorithm represents an interesting and potentially impactful contribution to the field of reinforcement learning. As the field continues to advance, techniques like WARP could help pave the way for more robust and reliable RL systems with applications across a wide range of domains.
**If you enjoyed this summary, consider subscribing to the [AImodels.fyi newsletter](https://aimodels.substack.com) or following me on [Twitter](https://twitter.com/mikeyoung44) for more AI and machine learning content.** | mikeyoung44 |
1,901,741 | Generative AI Misuse: A Taxonomy of Tactics and Insights from Real-World Data | Generative AI Misuse: A Taxonomy of Tactics and Insights from Real-World Data | 0 | 2024-06-26T19:24:30 | https://aimodels.fyi/papers/arxiv/generative-ai-misuse-taxonomy-tactics-insights-from | machinelearning, ai, beginners, datascience | *This is a Plain English Papers summary of a research paper called [Generative AI Misuse: A Taxonomy of Tactics and Insights from Real-World Data](https://aimodels.fyi/papers/arxiv/generative-ai-misuse-taxonomy-tactics-insights-from). If you like these kinds of analysis, you should subscribe to the [AImodels.fyi newsletter](https://aimodels.substack.com) or follow me on [Twitter](https://twitter.com/mikeyoung44).*
## Overview
- This paper presents a taxonomy of tactics for the misuse of generative AI systems, and provides insights from real-world data.
- The researchers studied examples of AI misuse to identify common tactics and understand the motivations and impacts.
- The findings offer important lessons for developing safer and more responsible AI systems.
## Plain English Explanation
The paper examines how people are misusing powerful AI tools, like chatbots and content generators, to cause harm. The researchers looked at real-world examples to identify common tactics employed by bad actors. This includes using AI to create misinformation, impersonate others, or generate abusive content.
The analysis reveals some concerning trends. For instance, [AI misuse tactics can enable the "influencer next door"](https://aimodels.fyi/papers/arxiv/influencer-next-door-how-misinformation-creators-use) to easily spread disinformation. Additionally, [data pollution issues with AI systems](https://aimodels.fyi/papers/arxiv/when-ai-eats-itself-caveats-data-pollution) can amplify the harms. The findings highlight the need for more [robust safety and ethical frameworks](https://aimodels.fyi/papers/arxiv/not-my-voice-taxonomy-ethical-safety-harms) to prevent generative AI from being misused.
## Technical Explanation
The researchers conducted a comprehensive review of real-world incidents involving the misuse of generative AI systems. They compiled a taxonomy of common tactics, including:
- **Identity Impersonation:** Using AI to mimic someone's voice, image or writing style to deceive
- **Misinformation Generation:** Automating the production of false or misleading content
- **Abusive Content Creation:** Generating harassing, hateful or otherwise harmful text, images or media
The paper analyzes the motivations behind these tactics, such as financial gain, political influence, and personal grudges. It also examines the scale, reach and impact of these misuse cases, which can be difficult to detect and combat.
The insights from this research can inform the development of [more robust legal and technical safeguards](https://aimodels.fyi/papers/arxiv/legal-risk-taxonomy-generative-artificial-intelligence) to [mitigate the risks of generative AI systems](https://aimodels.fyi/papers/arxiv/charting-landscape-nefarious-uses-generative-artificial-intelligence). This includes better authentication, content moderation, and transparency measures.
## Critical Analysis
The paper provides a valuable taxonomy and real-world examples to better understand the emerging threat of generative AI misuse. However, it acknowledges that the dataset is limited and may not fully capture the scale and diversity of these tactics in practice.
Additionally, the paper does not delve deeply into the technical details of how these misuse cases were detected and analyzed. More information on the methodologies used could strengthen the credibility of the findings.
While the paper offers high-level recommendations, it lacks specific guidance on how to effectively implement safeguards and counter-measures. Further research is needed to translate these insights into actionable solutions.
## Conclusion
This study sheds important light on the troubling ways that generative AI systems are being exploited for nefarious purposes. The taxonomy of misuse tactics and real-world case studies provide a crucial foundation for developing more robust safety and security measures.
Ultimately, the findings underscore the critical importance of proactively addressing the risks of generative AI, rather than waiting for these technologies to cause widespread harm. Ongoing research and collaboration between academia, industry, and policymakers will be essential to ensure the responsible development and deployment of these powerful tools.
**If you enjoyed this summary, consider subscribing to the [AImodels.fyi newsletter](https://aimodels.substack.com) or following me on [Twitter](https://twitter.com/mikeyoung44) for more AI and machine learning content.** | mikeyoung44 |
1,901,740 | Interior Design in Dubai: Elevating Standards of Design and Construction Excellence | Interior design in Dubai, known for its towering skyscrapers, luxurious lifestyle, and innovative... | 0 | 2024-06-26T19:24:03 | https://dev.to/sam_butt_e48888c74a1cd121/interior-design-in-dubai-elevating-standards-of-design-and-construction-excellence-1n07 | busines, interiordesign, blog | **[Interior design in Dubai](https://wdfitout.com/)**, known for its towering skyscrapers, luxurious lifestyle, and innovative architecture, has become a global hub for interior design. The city’s commitment to excellence in design and construction is evident in its awe-inspiring buildings and interiors that blend tradition and modernity. As the city continues to grow, so does its reputation for pushing the boundaries of interior design, setting new standards that inspire designers and builders worldwide.
## The Fusion of Tradition and Modernity
Dubai’s unique cultural heritage, combined with its futuristic vision, creates a distinctive aesthetic in interior design. Traditional Arabic elements, such as intricate geometric patterns, rich textiles, and ornate detailing, seamlessly integrate with contemporary design principles. This fusion creates culturally resonant and forward-thinking spaces, offering a unique visual and sensory experience.
## Innovative Use of Space and Materials
One of the hallmarks of Interior design in Dubai is the innovative use of space and materials. Designers in Dubai are renowned for their ability to transform ordinary spaces into extraordinary environments. Whether it’s a high-rise apartment, a sprawling villa, or a commercial space, the emphasis is on maximizing functionality without compromising on style.
Materials play a crucial role in this transformation. From the luxury of marble and gold to the sleekness of glass and steel, Dubai’s interiors often feature a rich palette of textures and finishes. This careful selection of materials enhances the aesthetic appeal and ensures durability and sustainability, aligning with the global trend towards eco-friendly design.
## Technology and Smart Living
Dubai’s commitment to innovation extends to embracing technology in interior design. Smart home systems, automated lighting, climate control, and advanced security features are becoming standard in high-end residential and commercial projects. These technological advancements enhance the convenience and comfort of living spaces, making them more adaptable to the needs of modern life.
## Focus on Sustainability
As a rapidly developing city, Interior design in Dubai faces unique environmental challenges. In response, there is a growing emphasis on sustainable design practices. Green building certifications, energy-efficient systems, and using recycled and locally sourced materials are becoming integral to interior design projects. This focus on sustainability reduces the environmental impact and creates healthier living and working environments.
## The Role of Interior Design Firms
The success of interior design in Dubai can be attributed to the expertise of its design firms. These firms bring knowledge, creativity, and professionalism to every project. They work closely with clients to understand and translate their vision into reality, ensuring every detail is meticulously planned and executed. From conceptualization to completion, the collaborative approach of Dubai’s design firms ensures that projects are delivered on time and to the highest standards.
## A Global Influence
Dubai’s approach to interior design is influencing trends around the world. The city’s ability to blend luxury with practicality, tradition with innovation, and sustainability with style serves as a blueprint for designers globally. As a result, many international designers and architects look to Dubai for inspiration and best practices.
## Conclusion
**[Interior design in Dubai](https://wdfitout.com/
)** is a testament to the city’s dedication to excellence and innovation. By harmonizing traditional elements with modern design, utilizing cutting-edge technology, and prioritizing sustainability, Dubai continues to set new benchmarks in the field of interior design. As the city evolves, its commitment to raising the bar for design and building excellence ensures that Dubai remains at the forefront of the global design landscape.
## Frequently Asked Questions (FAQs)
What sets Dubai’s interior design apart from other global cities?
Dubai’s interior design is distinguished by its unique blend of traditional Arabic elements and modern design principles. The city is known for its innovative use of space, luxurious materials, and advanced technology, creating functional and aesthetically pleasing spaces.
How important is sustainability in Dubai’s interior design projects?
Sustainability is increasingly important in Dubai’s interior design projects. Designers and builders are incorporating eco-friendly practices, such as using recycled materials, energy-efficient systems, and green building certifications, to reduce environmental impact and create healthier living and working environments.
What role does technology play in Dubai’s interior design?
Technology plays a significant role in Dubai’s interior design, with smart home systems, automated lighting, climate control, and advanced security features becoming standard in high-end projects. These technological advancements enhance living and working spaces' convenience, comfort, and adaptability.
How do interior design firms in Dubai approach their projects?
Interior design firms in Dubai adopt a collaborative approach, working closely with clients to understand their vision and preferences. They bring knowledge, creativity, and professionalism to each project, ensuring meticulous planning and execution from conceptualization to completion.
What types of materials are commonly used in Dubai’s interior design?
Interior design in Dubai often features a rich palette of materials, including opulent marble, gold, sleek glass, and steel. These materials are selected for their aesthetic appeal, durability, and sustainability, contributing to the luxurious and sophisticated ambiance of the spaces. | sam_butt_e48888c74a1cd121 |
1,901,739 | Next.js starter template | Hi, I created a starter template for next.js, it also contains typescript, tailwind, shadcn/ui. I... | 0 | 2024-06-26T19:23:53 | https://dev.to/michalskolak/nextjs-starter-template-7be | webdev, react, nextjs, tailwindcss | Hi,
I created a starter template for next.js, it also contains typescript, tailwind, shadcn/ui. I have already written about it here, but I have added some new functionalities such as: Next-auth, Prisma, React-hook-form, T3-env.
If you liked the project, I will appreciate if you leave a star. 🌟
[https://github.com/Skolaczk/next-starter](https://github.com/Skolaczk/next-starter)
A Next.js starter template, packed with features like TypeScript, Tailwind CSS, Next-auth, Eslint, testing tools and more. Jumpstart your project with efficiency and style.
🎉 Features
🚀 Next.js 14 (App router)
⚛️ React 18
📘 Typescript
🎨 TailwindCSS - Class sorting, merging and linting
🛠️ Shadcn/ui - Customizable UI components
🔒 Next-auth - Easy authentication library for Next.js (GitHub provider)
💵 Stripe - Payment handler
🛡️ Prisma - ORM for node.js
📋 React-hook-form - Manage your forms easy and efficient
🔍 Zod - Schema validation library
🧪 Jest & React Testing Library - Configured for unit testing
🎭 Playwright - Configured for e2e testing
📈 Absolute Import & Path Alias - Import components using @/ prefix
💅 Prettier - Code formatter
🧹 Eslint - Code linting tool
🐶 Husky & Lint Staged - Run scripts on your staged files before they are committed
🔹 Icons - From Lucide
🌑 Dark mode - With next-themes
🗺️ Sitemap & robots.txt - With next-sitemap
📝 Commitlint - Lint your git commits
🤖 Github actions - Lint your code on PR
⚙️ T3-env - Manage your environment variables
💯 Perfect Lighthouse score
🌐 I18n with Paraglide
If you liked the project, I will appreciate if you leave a star. 🌟😊
Made by Michał Skolak | michalskolak |
1,901,738 | React Context API | Why do we need context API. In React, passing props is a fundamental concept that... | 0 | 2024-06-26T19:19:42 | https://dev.to/geetika_bajpai_a654bfd1e0/react-context-api-4ig8 | ## Why do we need context API.
In React, passing props is a fundamental concept that enables a parent component to share data with its child components as well as other components within an application.
## Prop Drilling Explained:
<h3>State in Component A:</h3>Component A holds a piece of state, value: 1, and a function to update it, setCount().
<h3>Passing State through Components:</h3>To get the state (value) and the function (setCount()) to Component D, Component A needs to pass them as props to Component B.Component B, in turn, passes these props down to Component C.Finally, Component C passes them down to Component D.
<h2>Problems with Prop Drilling:</h2>
1. Complexity: As the number of components grows, the process of passing props through each intermediate component becomes cumbersome and error-prone.
2. Maintenance: If the state or function needs to be used by additional components at different levels, the structure must be adjusted accordingly, leading to increased complexity and reduced maintainability.
## Need for React Context API:
React Context API allows for state to be managed and accessed at a centralized place inside context. With Context API, the state and functions can be made available directly to any component in the component tree without passing props through each intermediate component.
<u>Simplified Code:</u> No need to pass props through multiple layers, leading to cleaner and more understandable code.
<u>Flexibility:</u> State and functions can be accessed and updated by any component within the provider, making the application more flexible and easier to maintain.
Now component A and D both can access without prop drilling. If component A change the state automatically component D re-render. Because component should also be re-render with fresh data. Means whenever in our context state changes those components who are reading that re-render itself with new value.
If we need to give access of context to these components so you need to wrap inside contextProvider.
if we don't give contextProvider these context will not access that context state. Now, in context these components can read and write also.
Now, we will start and see the code this increment decrement.
We will create `Counter.jsx` file inside context and write this.
This code defines a React context for managing a counter state and provides a context provider component to wrap parts of the application that need access to this counter state.
<h5>`export const CounterContext = createContext(null);`</h5>
- This line creates a context using createContext from React.
- CounterContext will be used to share state (and potentially other values) across the component tree without having to pass props down manually at every level.
- Initially, the context is set to null, meaning it has no default value.
<h5>CounterProvider</h5>
- The useState hook to create a piece of state called count and a function to update it called setCount.
- count is initialized to 0.
- Inside returns a `CounterContext.Provider` component the value prop of the provider is an object containing `count`, `setCount`, and `name: "Geet"`.
- `count`: The current count value.
- `setCount`: The function to update the count value.
- `name`: "Geet": A static value just for demonstration purposes
(it could be anything you want to share via context).
- `{props.children}`: This ensures that any components wrapped by `CounterProvider` will be rendered inside the provider, making the context values (count, setCount, and name) available to those components.
Wrap your application (or part of it) with `CounterProvider` like this
This code defines a Counter component in React that interacts with a shared counter state using the CounterContext.
- `useContext(CounterContext)` is called to access the values provided by the CounterProvider.
- `counterContext` now holds the context value, which includes the count and setCount state, and any other values provided by the context.
- The Counter component returns a div containing two buttons.
- The Increment button has an onClick handler that calls setCount with the current count incremented by 1.
- The Decrement button has an onClick handler that calls setCount with the current count decremented by 1.
This code defines the App component for a React application that uses the CounterContext to manage and display a shared counter state.
<h5>App Component:</h5>
- Uses useContext to access the CounterContext.
- Displays the current count from the context.
- Renders four Counter components, each of which can increment and decrement the shared counter state.
- This setup demonstrates how React context can be used for state management across multiple components, providing a shared state that can be accessed and modified by any component within the context provider.
| geetika_bajpai_a654bfd1e0 | |
1,873,369 | Styling in React | Introduction Styling is a crucial aspect of web development that ensures your applications... | 27,559 | 2024-06-26T19:17:00 | https://dev.to/suhaspalani/styling-in-react-1534 | webdev, css, react, programming | #### Introduction
Styling is a crucial aspect of web development that ensures your applications are visually appealing and user-friendly. React offers several approaches to styling components, from traditional CSS and Sass to modern CSS-in-JS solutions like Styled-Components. This week, we'll dive into these methods and learn how to apply them effectively in your React projects.
#### Importance of Styling in React
Proper styling enhances the user experience, improves usability, and makes your application more engaging. Understanding different styling techniques allows you to choose the best approach for your specific project needs.
#### Traditional CSS
**Using CSS with React:**
- **Basic Example**:
```javascript
import React from 'react';
import './App.css';
function App() {
return (
<div className="container">
<h1 className="title">Hello, World!</h1>
</div>
);
}
export default App;
```
- **App.css**:
```css
.container {
text-align: center;
padding: 20px;
}
.title {
color: blue;
font-size: 2em;
}
```
**CSS Modules:**
- **Example**:
```javascript
import React from 'react';
import styles from './App.module.css';
function App() {
return (
<div className={styles.container}>
<h1 className={styles.title}>Hello, World!</h1>
</div>
);
}
export default App;
```
- **App.module.css**:
```css
.container {
text-align: center;
padding: 20px;
}
.title {
color: blue;
font-size: 2em;
}
```
#### Using Sass
**Installing Sass:**
- **Command to Install**:
```bash
npm install node-sass
```
**Using Sass in React:**
- **App.scss**:
```scss
$primary-color: blue;
$padding: 20px;
.container {
text-align: center;
padding: $padding;
}
.title {
color: $primary-color;
font-size: 2em;
}
```
- **App Component**:
```javascript
import React from 'react';
import './App.scss';
function App() {
return (
<div className="container">
<h1 className="title">Hello, World!</h1>
</div>
);
}
export default App;
```
**Nested Styling with Sass:**
- **Example**:
```scss
.container {
text-align: center;
padding: 20px;
.title {
color: blue;
font-size: 2em;
&:hover {
color: darkblue;
}
}
}
```
#### Styled-Components
**Introduction to Styled-Components:**
- **Definition**: A library for styling React components using tagged template literals.
- **Installation**:
```bash
npm install styled-components
```
**Using Styled-Components:**
- **Example**:
```javascript
import React from 'react';
import styled from 'styled-components';
const Container = styled.div`
text-align: center;
padding: 20px;
`;
const Title = styled.h1`
color: blue;
font-size: 2em;
&:hover {
color: darkblue;
}
`;
function App() {
return (
<Container>
<Title>Hello, World!</Title>
</Container>
);
}
export default App;
```
**Theming with Styled-Components:**
- **Creating a Theme**:
```javascript
import { ThemeProvider } from 'styled-components';
const theme = {
colors: {
primary: 'blue',
secondary: 'darkblue'
},
spacing: {
padding: '20px'
}
};
function App() {
return (
<ThemeProvider theme={theme}>
<Container>
<Title>Hello, World!</Title>
</Container>
</ThemeProvider>
);
}
```
- **Using Theme Values**:
```javascript
import styled from 'styled-components';
const Container = styled.div`
text-align: center;
padding: ${(props) => props.theme.spacing.padding};
`;
const Title = styled.h1`
color: ${(props) => props.theme.colors.primary};
font-size: 2em;
&:hover {
color: ${(props) => props.theme.colors.secondary};
}
`;
```
#### Conclusion
Choosing the right styling approach in React depends on your project requirements and personal preference. Traditional CSS and Sass offer familiarity and simplicity, while Styled-Components provide dynamic and scoped styling capabilities. Mastering these techniques will help you build beautiful and maintainable user interfaces.
#### Resources for Further Learning
- **Online Courses**: Websites like Udemy, Pluralsight, and freeCodeCamp offer courses on React styling techniques.
- **Books**: "React and React Native" by Adam Boduch and "React Quickly" by Azat Mardan.
- **Documentation and References**:
- [Styled-Components Documentation](https://styled-components.com/docs)
- [Sass Documentation](https://sass-lang.com/documentation)
- [React CSS Modules Documentation](https://github.com/css-modules/css-modules)
- **Communities**: Join developer communities on platforms like Stack Overflow, Reddit, and GitHub for support and networking.
| suhaspalani |
1,901,737 | React Component or Example for Comparison View | Can someone help me with a good react example where i want to show previous and current table rows... | 0 | 2024-06-26T19:14:29 | https://dev.to/java_development_0653df7f/react-component-or-example-for-comparison-view-5hfd | Can someone help me with a good react example where i want to show previous and current table rows differences ?
Assume a person know the difference between employee record of v1 and v2
Looking for a good design and a nice react example or component. Please advise | java_development_0653df7f | |
1,901,736 | Unleashing Imagination: The Best Children's Book Illustration Services in the UK | Children's books are a gateway to the world of imagination, adventure, and learning. Behind every... | 0 | 2024-06-26T19:07:47 | https://dev.to/craft2publish/unleashing-imagination-the-best-childrens-book-illustration-services-in-the-uk-1d50 | webdev, javascript, beginners, programming | Children's books are a gateway to the world of imagination, adventure, and learning. Behind every captivating story lies a powerful visual journey crafted by talented illustrators. In the UK, the field of children's [book illustration in uk](https://craft2publish.com/childrens-book-illustration/) is thriving, with professional services that transform simple narratives into vibrant, engaging experiences. Let's delve into the enchanting world of children's book illustrations and explore why professional illustration services are vital for creating memorable children's literature.
## The Art of Illustrations for Children's Books
Illustrations are more than just pictures accompanying text; they are a crucial element that brings stories to life. They provide visual context, evoke emotions, and engage young readers, making the narrative more accessible and enjoyable. For children, especially, illustrations play a pivotal role in understanding and enjoying a story. The combination of visual and textual storytelling helps in developing their imagination and reading skills.
## Top Illustrators in Children's Books
The UK boasts a rich history of exceptional children's book illustrators who have left an indelible mark on young readers worldwide. From classic illustrators like Beatrix Potter to contemporary artists like Quentin Blake, the tradition of outstanding book illustration continues. Today's illustrators combine traditional techniques with modern digital tools, creating artwork that is both timeless and innovative.
## Children's Book Illustrator: The Creative Process
Creating illustrations for children's books is a meticulous process that involves understanding the story's essence and the author's vision. Here's a glimpse into the typical workflow of a professional children's book illustrator:
**Conceptualization:** The illustrator reads the manuscript and discusses ideas with the author to grasp the story's tone, characters, and settings.
Sketching: Initial sketches are created to outline the main scenes and characters. This phase is crucial for experimenting with different styles and compositions.
**Feedback and Revisions:** The illustrator collaborates with the author and publisher, making necessary revisions to ensure the illustrations align perfectly with the narrative.
Final Artwork: Once the sketches are approved, the illustrator moves on to create the final artwork, adding color, details, and finishing touches.
**Integration:** The final illustrations are integrated into the book layout, ensuring a seamless blend of text and imagery.
Professional Illustration Services: Why They Matter
Investing in professional illustration services is essential for several reasons:
Quality and Consistency: Professional illustrators bring a high level of skill and experience, ensuring that the artwork is of superior quality and consistent throughout the book.
**Unique Style:** Each illustrator has a unique style that can add a distinct personality to the book, making it stand out in the competitive market.
Engagement and Appeal: High-quality illustrations capture the attention of young readers and keep them engaged, fostering a love for reading.
**Marketability: **Professionally illustrated books are more likely to attract publishers and buyers, enhancing the book's commercial success.
Finding the Right Illustrator for Your Children's Book
When selecting an illustrator for your children's book, consider the following tips:
**Portfolio Review:** Examine the illustrator's portfolio to ensure their style matches your vision.
Experience and Specialization: Choose an illustrator with experience in children's books, as they understand the nuances of creating engaging illustrations for young audiences.
**Collaboration:** Look for an illustrator who is open to collaboration and can communicate effectively with you throughout the process.
Budget and Timeline: Ensure the illustrator's fees align with your budget and that they can meet your project's deadlines.
**Conclusion**
Children's book illustrations are a vital component of storytelling that can transform a simple narrative into a magical experience. In the UK, the realm of children's book illustration is flourishing with talented professionals who bring stories to life with their artistic prowess. By investing in professional illustration services, authors and publishers can create captivating books that not only entertain but also inspire young minds.
Whether you're an author seeking to publish your first children's book or a publisher looking to enhance your catalog, the right illustrator can make all the difference. Explore the vibrant world of children's book illustration in the UK and unleash the full potential of your stories. | craft2publish |
1,901,734 | What is Behavior Driven Development (BDD)? | Introduction What is bdd ? Behavior Driven Development (BDD) is an agile software development... | 0 | 2024-06-26T18:48:51 | https://dev.to/keploy/what-is-behavior-driven-development-bdd-10ca | webdev, javascript, beginners, programming |
Introduction
[What is bdd](https://keploy.io/docs/concepts/reference/glossary/behaviour-driven-development/) ?
Behavior Driven Development (BDD) is an agile software development methodology that emphasizes collaboration among all stakeholders—developers, testers, and business analysts—to create a shared understanding of the behavior of a software application. BDD extends Test Driven Development (TDD) by focusing on the behavior of the application from the end user's perspective. It uses natural language constructs to describe the expected behavior, making it accessible to non-technical stakeholders.
Core Concepts of BDD
1. Collaboration: BDD encourages continuous communication among all members of a project team. This collaboration helps ensure that the developed features meet business requirements and user needs.
2. Ubiquitous Language: BDD employs a common language that everyone on the team can understand, derived from the domain in which the application operates. This language is used to write user stories and scenarios.
3. Focus on Behavior: BDD shifts the focus from testing the implementation to specifying the behavior of the application. This helps ensure that the software behaves as expected from the user's perspective.
4. Executable Specifications: BDD scenarios are written in a way that they can be automated and executed as tests. This ensures that the specifications are always up-to-date and can be verified continuously.
The BDD Process
The BDD process typically involves the following steps:
1. Discovery: Stakeholders collaborate to identify and understand the requirements. They work together to define the desired behaviors of the system, often through workshops and discussions.
2. Formulation: The identified behaviors are translated into clear, executable specifications. These are usually written in the Given-When-Then format:
o Given: The initial context or state.
o When: The event or action that triggers the behavior.
o Then: The expected outcome or result.
3. Automation: The formulated scenarios are automated using BDD tools such as Cucumber, SpecFlow, or Behave. These tools allow the scenarios to be executed as tests that validate the system's behavior.
4. Implementation: Developers write the code necessary to make the scenarios pass. This often involves using TDD practices to ensure that both unit-level and behavior-level tests are covered.
5. Iteration: The process is iterative, with continuous feedback and refinement. New behaviors are added, and existing ones are updated as requirements evolve.
Writing Effective BDD Scenarios
Effective BDD scenarios are crucial for the success of BDD. Here are some best practices:
1. Clarity: Scenarios should be easy to read and understand. Avoid technical jargon and keep the language simple.
2. Behavior Focused: Describe the behavior of the system from the user's perspective, not the implementation details.
3. Real-World Examples: Use real-world examples and use cases to make scenarios relevant and meaningful.
4. Independence: Each scenario should be independent and test a single behavior or feature. This makes it easier to understand failures and maintain tests.
5. Prioritization: Focus on the most critical behaviors first, ensuring that important features are tested and implemented early.
Benefits of BDD
1. Improved Communication: BDD fosters better communication among team members and stakeholders, bridging the gap between technical and non-technical participants.
2. Higher Quality Software: By focusing on expected behaviors and automating acceptance tests, BDD helps ensure that the software meets user requirements and behaves as expected.
3. Reduced Misunderstandings: The collaborative nature of BDD reduces misunderstandings and misinterpretations of requirements, leading to fewer defects and rework.
4. Enhanced Documentation: BDD scenarios serve as living documentation that evolves with the system, accurately reflecting its current state.
5. Faster Feedback: Automated acceptance tests provide quick feedback on the impact of changes, allowing teams to detect and address issues early.
Challenges of BDD
Despite its benefits, BDD also comes with challenges:
1. Initial Learning Curve: Teams may face an initial learning curve when adopting BDD. It requires a shift in mindset and practices, which can take time to get used to.
2. Maintenance of Tests: As the system evolves, maintaining the automated tests can become challenging. This requires ongoing effort to keep the tests relevant and up-to-date.
3. Collaboration Overhead: The collaborative nature of BDD can introduce some overhead, especially in large teams or organizations. Effective communication and coordination are crucial to mitigate this.
Tools for BDD
Several tools are available to support BDD practices, each catering to different languages and platforms:
• Cucumber: A popular BDD tool for Ruby, Java, and JavaScript. It uses the Gherkin language to define scenarios.
• SpecFlow: A BDD tool for .NET that integrates with Visual Studio and uses Gherkin for writing scenarios.
• Behave: A BDD framework for Python that also uses Gherkin syntax.
• JBehave: A BDD framework for Java that supports writing scenarios in plain English.
Conclusion
Behavior Driven Development is a powerful methodology that enhances collaboration, improves software quality, and ensures that the developed system meets user expectations. By focusing on user-centric behaviors and using a common language, BDD bridges the gap between technical and non-technical stakeholders, fostering a shared understanding and clear communication. While there are challenges to adopting BDD, the benefits far outweigh them, making it a valuable practice for modern software development.
| keploy |
1,901,726 | Database Transactions : Concurrency Control | The number of users who can use the database engine concurrently is a significant criteria for... | 27,868 | 2024-06-26T18:47:41 | https://dev.to/aharmaz/database-transactions-concurrency-control-1h6i | database, transaction, concurrenc, performance | The number of users who can use the database engine concurrently is a significant criteria for classifying the database management systems. A DBMS is single-user if at most one user at a time can use the engine and it is multiuser if many users can use it concurrently. Most of the DBMSs need to be multiuser, for example databases used in banks, insurance agencies, supermarkets should be multiuser, hundreds of thousands of users will be operating on the database by submitting transactions concurrently to the engine.
**Why Concurrency Control is needed**
When executing concurrent transaction in an uncontrolled way, many issues can rise like dirty read, non-repeatable read, phantom read, lost update. We will go through each of those issues.
*Dirty Read*
Is a situation in which a transaction T1 reads the update of a transaction T2 which has not committed yet, then if T2 fails, then T1 would have read and would have worked with a value that does not exist and is incorrect.
*Non-repeatable Read*
Is a situation in which transaction T1 may read a given value from a table, if another transaction T2 lated updates that value and T1 reads that value again, it will see a different value from the first one it got initially.
*Phantom Read*
Is a situation in which a transaction T1 may read a set of rows from a table based on some condition specified in the query where clause, then transaction T2 will insert a new row that also satisfies the where clause condition used in T1, then if T1 tries to perform the same query it will get the newly added row this time
*Lost Update*
after the T1 commits the change by T2 will be lost considered as if it was never done.
*Dirty Write*
Is a situation in which one of the transactions takes an uncommitted value (dirty read), modifies it and saves it.
**Strategies for dealing with concurrent transactions**
We have 2 options for controlling the execution of concurrent transactions, we either choose to run the access operation to a specific data item sequently across transactions, or we choose to parallelize the execution that access, there are multiple isolation levels that can be used for implementing these choices and each one of them may prevent and allow some of the issues related to concurrency.
In the SQL standard, there are 4 isolation levels :
In Oracle, there are only 2 isolation levels :
Dirty Reads are not allowed since read committed is the lowest isolation level supported in Oracle
In PostgreSQL, there are 4 isolation levels, and read committed and read uncommitted behaves in the same way :
read uncommitted and read committed behave in the same way and they don't allow dirty read and dirty write issues to happen
In MySQL, there are 4 isolation levels, and read uncommitted prevents dirty write and allows dirty read :
 | aharmaz |
1,901,733 | Prestige Golf Cars | Prestige Golf Cars Address: 1085 W Pioneer Blvd ste 160, Mesquite, NV 89027 Phone: (725)... | 0 | 2024-06-26T18:44:58 | https://dev.to/snzbn/prestige-golf-cars-3lcc | prestage, golf, carts | Prestige Golf Cars
Address: 1085 W Pioneer Blvd ste 160, Mesquite, NV 89027
Phone: (725) 296-2862
Email: sales@prestigegolfcars.com
Website: https://prestigegolfcars.com
GMB Profile: https://www.google.com/maps?cid=15050115738512877032
Prestige Golf Cars, nestled at 1085 W Pioneer Blvd ste 160, Mesquite, NV 89027, United States, stands as the go-to destination for golf enthusiasts seeking top-notch golf carts and accessories. Our commitment to excellence and passion for enhancing your golfing experience make us a trusted name in the industry.
Explore our showroom to discover a diverse range of golf carts, each meticulously crafted for performance, style, and durability. Whether you're a seasoned golfer or a recreational player, we cater to all preferences and needs. Our team takes pride in offering personalized service, guiding you to the perfect golf cart that aligns with your game and lifestyle.
Working Hours:
MONDAY-SATURDAY: 10:00 AM – 4:00 PM
SUNDAY: CLOSED
SATURDAY: OPEN FOR SALES DEPARTMENT ONLY
Keywords: Prestige Golf Cars, Golf Carts Mesquite NV | snzbn |
1,901,732 | Mastering SOLID Principles ✅ | The SOLID principles are design principles in object-oriented programming that help developers create... | 0 | 2024-06-26T18:44:02 | https://dev.to/alisamirali/mastering-solid-principles-1aa6 | solidprinciples, javascript, softwaredevelopment, softwareengineering | The SOLID principles are design principles in object-oriented programming that help developers create more understandable, flexible, and maintainable software.
Let's dive into each principle and see how they can be applied using JavaScript.
---
##📌 1. Single Responsibility Principle (SRP)
**Definition:** A class should have only one reason to change, meaning it should have only one job or responsibility.
```js
class User {
constructor(name, email) {
this.name = name;
this.email = email;
}
}
class UserService {
createUser(user) {
// logic to create user
}
getUser(id) {
// logic to get user
}
}
class UserNotificationService {
sendWelcomeEmail(user) {
// logic to send email
}
}
const user = new User('John Doe', 'john.doe@example.com');
const userService = new UserService();
userService.createUser(user);
const notificationService = new UserNotificationService();
notificationService.sendWelcomeEmail(user);
```
Here, `User` handles the user data, `UserService` handles user-related operations, and `UserNotificationService` handles notifications. Each class has a single responsibility.
---
##📌 2. Open/Closed Principle (OCP)
**Definition:** Software entities should be open for extension but closed for modification.
```js
class Rectangle {
constructor(width, height) {
this.width = width;
this.height = height;
}
area() {
return this.width * this.height;
}
}
class Circle {
constructor(radius) {
this.radius = radius;
}
area() {
return Math.PI * Math.pow(this.radius, 2);
}
}
const shapes = [new Rectangle(4, 5), new Circle(3)];
const totalArea = shapes.reduce((sum, shape) => sum + shape.area(), 0);
console.log(totalArea);
```
In this example, each shape class's `area` method (like `Rectangle` and `Circle`) can be extended without modifying the existing code of the shape classes. This allows for adding new shapes in the future without changing the existing ones.
---
##📌 3. Liskov Substitution Principle (LSP)
**Definition:** Subtypes must be substitutable for their base types without altering the correctness of the program.
```js
class Bird {
fly() {
console.log('I can fly');
}
}
class Duck extends Bird {}
class Ostrich extends Bird {
fly() {
throw new Error('I cannot fly');
}
}
function makeBirdFly(bird) {
bird.fly();
}
const duck = new Duck();
makeBirdFly(duck); // Works fine
const ostrich = new Ostrich();
makeBirdFly(ostrich); // Throws error
```
In this example, `Ostrich` violates LSP because it changes the expected behavior of the `fly` method. To comply with LSP, we should ensure that subclasses do not change the behavior expected by the base class.
---
##📌 4. Interface Segregation Principle (ISP)
**Definition:** Clients should not be forced to depend on interfaces they do not use.
```js
class Printer {
print() {
console.log('Printing document');
}
}
class Scanner {
scan() {
console.log('Scanning document');
}
}
class MultiFunctionPrinter {
print() {
console.log('Printing document');
}
scan() {
console.log('Scanning document');
}
}
const printer = new Printer();
printer.print();
const scanner = new Scanner();
scanner.scan();
const multiFunctionPrinter = new MultiFunctionPrinter();
multiFunctionPrinter.print();
multiFunctionPrinter.scan();
```
Here, `Printer` and `Scanner` classes provide specific functionalities without forcing clients to implement methods they don't need. The `MultiFunctionPrinter` can use both functionalities, adhering to the ISP.
---
##📌 5. Dependency Inversion Principle (DIP)
**Definition:** High-level modules should not depend on low-level modules. Both should depend on abstractions. Abstractions should not depend on details. Details should depend on abstractions.
```js
class NotificationService {
constructor(sender) {
this.sender = sender;
}
sendNotification(message) {
this.sender.send(message);
}
}
class EmailSender {
send(message) {
console.log(`Sending email: ${message}`);
}
}
class SMSSender {
send(message) {
console.log(`Sending SMS: ${message}`);
}
}
const emailSender = new EmailSender();
const notificationService = new NotificationService(emailSender);
notificationService.sendNotification('Hello via Email');
const smsSender = new SMSSender();
const notificationServiceWithSMS = new NotificationService(smsSender);
notificationServiceWithSMS.sendNotification('Hello via SMS');
```
In this example, the `NotificationService` depends on an abstraction (`sender`), allowing it to work with any sender implementation (like `EmailSender` or `SMSSender`). This adheres to DIP by making the high-level module (`NotificationService`) depend on abstractions rather than concrete implementations.
---
---
## Conclusion ✅
By adhering to the SOLID principles, you can design JavaScript applications that are more robust, maintainable, and scalable.
These principles help to ensure that your codebase remains clean and flexible, making it easier to manage and extend as your application grows.
Applying these principles consistently can significantly improve the quality of your software.
---
**_Happy Coding!_** 🔥
**[LinkedIn](https://www.linkedin.com/in/dev-alisamir)**, **[X (Twitter)](https://twitter.com/dev_alisamir)**, **[Telegram](https://t.me/the_developer_guide)**, **[YouTube](https://www.youtube.com/@DevGuideAcademy)**, **[Discord](https://discord.gg/s37uutmxT2)**, **[Facebook](https://www.facebook.com/alisamir.dev)**, **[Instagram](https://www.instagram.com/alisamir.dev)**
| alisamirali |
1,901,724 | AI Environmental Bot Creation: A Step-by-Step Guide with Twilio, Node.js, Gemini, and Render | Hello 👋 In this blog, we will explore how to build a WhatsApp bot using Twilio, Node.js, Typescript,... | 0 | 2024-06-26T18:40:35 | https://imkarthikeyans.hashnode.dev/ai-environmental-bot-creation-a-step-by-step-guide-with-twilio-nodejs-gemini-and-render | webdev, javascript, beginners, twilio | Hello 👋
In this blog, we will explore how to build a WhatsApp bot using Twilio, Node.js, Typescript, Render, and Gemini.
**Pre-requisites :**
* Have a Twilio account. If you don’t have one, you can register for a [trial account](https://www.twilio.com/try-twilio)
* Install [Ngrok](https://ngrok.com/) and make sure it’s authenticated.
* Have a [OpenweatherMap](https://openweathermap.org/) account and the API key
* Create a [Gemini Account](https://aistudio.google.com/app/apikey) and the API key
## Setting up the development environment
First create the directory `environmental-bot` and run this following command
```bash
npm init -y
```
Install the following dependencies to setup our basic node server. Later we will add the typescript to our project.
```bash
npm i express dotenv
```
Create the index.js file in the `src` folder and the following code
```javascript
const express = require('express');
const dotenv = require('dotenv');
dotenv.config();
const app = express();
const port = process.env.PORT;
app.get('/', (req, res) => {
res.send('Express + TypeScript Server');
});
app.listen(3000, () => {
console.log('[server]: Server is running at http://localhost:3000');
});
```
Now in your terminal run `npm run dev` and if you check the browser , you should see the following
Now , let's add the typescript to our project. Install the following dependencies
```bash
npm i -D typescript @types/express @types/node
```
Once done, let's initalize the `tsconfig` for our project
> `tsconfig.json` is a configuration file for TypeScript that specifies the root files and compiler options needed to compile a TypeScript project.
Run the following command in your terminal
```bash
npx tsc --init
```
This will create a basic tsconfig.json file in your project's root directory. You need to enable the outDir option, which specifies the destination directory for the compiled output. Locate this option in the tsconfig.json file and uncomment it.
By default, the value of this option is set to the project’s root. Change it to `dist`, as shown below:
```javascript
{
"compilerOptions": {
...
"outDir": "./dist"
...
}
}
```
Let's update the `main` field in the `package.json` file to `dist/index.js` as the TypeScript code will compile from the `src` directory to `dist`. It should look something like this
```javascript
// package.json
{
"name": "environmental-bot",
"version": "1.0.0",
"description": "",
"main": "dist/index.js",
"scripts": {
"build": "npx tsc",
"start": "node dist/index.js",
"dev": "nodemon src/index.ts"
},
...
}
```
Next step is to add type changes to our `index.js` file and rename it to `index.ts`
```javascript
// src/index.js -> src/index.ts
import express, { Express, Request, Response } from "express";
import dotenv from "dotenv";
dotenv.config();
const app: Express = express();
const port = process.env.PORT || 3000;
app.get("/", (req: Request, res: Response) => {
res.send("Express + TypeScript Server");
});
app.listen(3000, () => {
console.log('[server]: Server is running at http://localhost:3000');
});
```
Now let's try stopping and restarting the server with same command `npm run dev` and when we do , we will get the following error
```bash
Cannot use import statement outside a module
```
That is because Node.js does not natively support the execution of TypeScript files. To avoid that, let's use the package called `ts-node` . Let's first install the following dependencies and make some changes in the `package.json` script file.
```bash
npm i -D nodemon ts-node
```
> Nodemon automatically restarts your Node.js application when it detects changes in the source files, streamlining the development process.
The `build` command compiles the code into JavaScript and saves it in the `dist` directory using the TypeScript Compiler (tsc). The `dev` command runs the Express server in development mode using nodemon and ts-node.
One last step before the fun part , let's install `concurrently` and setup it in our `nodemon.json` .
> `concurrently` allows you to run multiple commands or scripts simultaneously in a single terminal window, streamlining your workflow.
```bash
## terminal command
npm i -D concurrently
## nodemon.json
{
"watch": ["src"],
"ext": "ts",
"exec": "concurrently \"npx tsc --watch\" \"ts-node src/index.ts\""
}
```
## Setting up the twilio
To complete the setup process for Twilio:
1. Log in to your Twilio account.
2. Access your Twilio Console dashboard.
3. Navigate to the WhatsApp sandbox:
* Select **Messaging** from the left-hand menu.
* Click on **Try It Out**.
* Choose **Send A WhatsApp Message**.
From the sandbox tab, note the Twilio phone number and the join code. The WhatsApp sandbox allows you to test your application in a development environment without needing approval from WhatsApp.
## Coding the bot
**System Architecture for AI-Driven Environmental Bot**
1. **WhatsApp Bot (UI)**: User sends their location via WhatsApp.
2. **OpenWeatherMap API**: Fetches the air quality index (AQI) based on the user's location.
3. **Gemini AI**: Analyzes the AQI data and generates personalized safety advice.
4. **Response**: The AI-generated advice is sent back to the user via WhatsApp.
To enable integration with WhatsApp, your web application must be accessible through a public domain.
To achieve this, utilize **ngrok** to expose your local web server by executing the following command in a different tab on your terminal:
```bash
ngrok http 3000
```
Add the following things to the `.env` file
```javascript
OPENWEATHERMAPAPI=****
GEMINIAPIKEY=****
```
Let's create a another endpoint `/incoming` and add it in the Sandbox settings in the twilio console. It should look something like in the below screenshot
Add the following code in the `src/index.ts`
```javascript
import express, { Express, Request, Response } from "express";
import dotenv from "dotenv";
import twilio from 'twilio';
dotenv.config();
const app = express();
const port = process.env.PORT;
const accountSid = process.env.ACCOUNTID;
const authToken = process.env.AUTHTOKEN;
// const client = new twilio(accountSid, authToken);
app.get('/', (req: Request, res: Response) => {
res.send('Express + TypeScript Server');
});
const MessagingResponse = twilio.twiml.MessagingResponse;
app.post('/incoming', (req, res) => {
const message = req.body;
console.log(`Received message from ${message.From}: ${message.Body}`);
const twiml = new MessagingResponse();
twiml.message(`You said: ${message.Body}`);
res.writeHead(200, { 'Content-Type': 'text/xml' });
res.end(twiml.toString());
});
app.listen(port, () => {
console.log(`[server]: Server is running at http://localhost:${port}`);
});
```
Now, when you connect your WhatsApp and send a message, you should receive a reply.
Next step , let's connect the `openweathermap` and get the AQI response. Let's update the code
```javascript
// src/index.js
import express, { Express, Request, Response } from "express";
import dotenv from "dotenv";
import twilio from 'twilio';
import axios from 'axios'
dotenv.config();
const app = express();
const port = process.env.PORT;
const MessagingResponse = twilio.twiml.MessagingResponse;
async function getAirQuality(lat: number, lon: number) {
const apiKey = process.env.OPENWEATHERMAPAPI;
const url = `http://api.openweathermap.org/data/2.5/air_pollution?lat=${lat}&lon=${lon}&appid=${apiKey}`;
const response = await axios.get(url);
const airQualityIndex = response.data.list[0].main.aqi;
return airQualityIndex;
}
app.get('/', (req: Request, res: Response) => {
res.send('Express + TypeScript Server');
});
app.post('/incoming', async (req, res) => {
const message = req.body;
const {Latitude, Longtitude, From, Body} = message;
const airQualityIndex = await getAirQuality(Latitude, Longtitude);
console.log(`Air quality index in your places is ${airQualityIndex}`);
const twiml = new MessagingResponse();
twiml.message(`You said: ${message.Body}`);
res.writeHead(200, { 'Content-Type': 'text/xml' });
res.end(twiml.toString());
});
app.listen(port, () => {
console.log(`[server]: Server is running at http://localhost:${port}`);
});
```
Now, when we run the following code , and send a message in whatsapp , we will get the AQI response in the console.
```javascript
{
"coord":[
50,
50
],
"list":[
{
"dt":1605182400,
"main":{
"aqi":1
},
"components":{
"co":201.94053649902344,
"no":0.01877197064459324,
"no2":0.7711350917816162,
"o3":68.66455078125,
"so2":0.6407499313354492,
"pm2_5":0.5,
"pm10":0.540438711643219,
"nh3":0.12369127571582794
}
}
]
}
```
Now, for the final part, integrate Gemini to complete the bot.
Install the following dependencies
```bash
npm install @google/generative-ai
```
Update the following in your `src/index.ts` file
```javascript
// src/index.js
import express, { Express, Request, Response } from 'express';
import dotenv from 'dotenv';
import MessagingResponse from 'twilio/lib/twiml/MessagingResponse';
import axios from 'axios';
import { GoogleGenerativeAI } from '@google/generative-ai';
import cors from 'cors';
dotenv.config();
const app: Express = express();
const port = process.env.PORT;
const geminiAPIKey = process.env.GEMINIAPIKEY as string;
const genAI = new GoogleGenerativeAI(geminiAPIKey);
const model = genAI.getGenerativeModel({ model: "gemini-1.5-flash" });
async function getAirQuality(lat: number, lon: number) {
const apiKey = process.env.OPENWEATHERMAPAPI;
const url = `http://api.openweathermap.org/data/2.5/air_pollution?lat=${lat}&lon=${lon}&appid=${apiKey}`;
const response = await axios.get(url);
const airQualityIndex = response.data.list[0].main.aqi;
return airQualityIndex;
}
const predictHazard = async (airQualityIndex: number) => {
const prompt = `The air quality index is ${airQualityIndex}. The AQI scale is from 1 to 5, where 1 is good and 5 is very poor. Predict the potential hazard level and provide safety advice.`;
const result = await model.generateContent(prompt);
const response = await result.response;
const text = response.text();
console.log(text);
return text;
}
app.use(cors());
app.use(express.urlencoded({ extended: false }));
app.use(express.json());
app.get('/', (req: Request, res: Response) => {
res.send('Express + TypeScript Server');
});
app.post('/incoming', async (req, res) => {
const { Latitude, Longitude, Body } = req.body;
console.log(Latitude, Longitude);
const airQuality = await getAirQuality(Latitude, Longitude);
console.log("airQuality", airQuality);
console.log(`Received message from ${Body}`);
const alert = await predictHazard(airQuality);
const twiml = new MessagingResponse();
twiml.message(alert);
res.writeHead(200, { 'Content-Type': 'text/xml' });
res.end(twiml.toString());
});
app.listen(port, () => {
console.log(`[server]: Server is running at http://localhost:${port}`);
});
```
Quick code overview
* **AI and API Key Setup**: Set up the Google Generative AI model and the OpenWeatherMap API key.
* **Air Quality Function**: Define an async function `getAirQuality` to fetch air quality data from OpenWeatherMap using latitude and longitude.
* **Hazard Prediction Function**: Define an async function `predictHazard` that uses the Google Generative AI model to generate safety advice based on the air quality index.
* **Middleware**: Use `cors`, `express.urlencoded`, and `express.json` to handle requests.
There are many ways to deploy the node.js application, I have connected the github repository to [render](https://render.com/).
You can start by deploying it as a service, adding the necessary environment variables, and then deploying it. Once completed, add it to the Twilio sandbox settings.
Let's test it out.
Connect to the whatsapp sandbox and send a location message , you should get the response from the AI
[Instagram](https://www.instagram.com/coding_nemo) | imkarthikeyan |
1,901,730 | Innovate Trading Strategies and Algorithms Together | Are you a passionate developer or programmer with a keen interest in the forex market? Do you thrive... | 0 | 2024-06-26T18:40:18 | https://dev.to/siddharthdholu/innovate-trading-strategies-and-algorithms-together-4jo | programming, trading, algorithms, forex | Are you a passionate developer or programmer with a keen interest in the forex market? Do you thrive on the challenge of creating cutting-edge strategies and algorithms? If so, we want you to join our exciting new initiative!
**About Us**
We are building a vibrant community of developers who share a common goal: to revolutionize trading by developing the best strategies and algorithms. Our focus is on leveraging our collective expertise to identify market patterns and automate order placements, ultimately creating powerful tools that benefit traders worldwide.
**Why Join Us?**
- Collaborative Environment: Work alongside like-minded individuals who are as passionate about trading and programming as you are.
- Innovative Projects: Engage in projects that push the boundaries of what's possible in trading technology.
- Skill Development: Enhance your skills in algorithmic trading, machine learning, and data analysis.
- Community Support: Benefit from a supportive community that values sharing knowledge and resources.
**What We're Looking For**
- Programming Enthusiasts: Whether you're proficient in Python, C++, Java, or any other programming language, your skills are valuable to us.
- Trading Aficionados: A strong interest in the forex market and trading strategies is essential.
- Collaborative Mindset: We're looking for team players who are eager to share ideas and work together towards common goals.
- Problem Solvers: Individuals who enjoy tackling complex problems and developing innovative solutions.
**Get Involved**
Ready to be part of something big? Join us and contribute to the development of state-of-the-art trading tools. Together, we can make a significant impact on the trading industry.
**How to Join:**
1. Connect with Us: Reach out to us via Discord server: [https://discord.gg/TWxQTdnQ](https://discord.gg/TWxQTdnQ)
2. Introduce Yourself: Tell us about your background in programming and trading.
3. Get Started: Jump into ongoing projects or propose new ideas to the community.
_Don't miss this opportunity to be at the forefront of trading technology. Let's create something extraordinary together!_ | siddharthdholu |
1,901,725 | Ingesting Data to Parseable Using Pandas | A Step-by-Step Guide Managing and deriving insights from vast amounts of historical data... | 0 | 2024-06-26T18:40:04 | https://dev.to/parseable/ingesting-data-to-parseable-using-pandas-pm1 | database, monitoring, devops, python | ## A Step-by-Step Guide
Managing and deriving insights from vast amounts of historical data is not just a challenge but a necessity. Imagine your team grappling with numerous log files, trying to pinpoint issues. But, because logs are stored as files, it is very inefficient to search through them. This scenario is all too familiar for many developers.
Enter Parseable, a powerful solution to analyze your application logs. By integrating with pandas, the renowned Python library for data analysis, Parseable offers a seamless way to ingest and leverage historical data without the need to discard valuable logs.
In this post, we explore how Parseable can revolutionize your data management strategy, enabling you to unlock actionable insights from both current and archived log data effortlessly.
### Requirements
- Python installed on your system
- Pandas library
- Requests library
- A CSV file to be ingested
- Access to the Parseable API
### The CSV File
Our code example is based on a Kaggle Dataset. We've used a CSV file named e-shop_clothing_2008.csv. Feel free to use your own dataset to follow along. First, ensure your CSV file is formatted correctly and accessible from the script's directory.
### The Parseable API
Next, we'll interact with the Parseable API to send our data. Here we're using the demo Parseable instance. Before sending any data, please ensure you have entered the correct endpoint and credentials:
Endpoint: https://demo.technocube.in/api/v1/ingest
Username: admin
Password: admin
### Writing the Script
Here’s a Python script that reads the CSV file in chunks and sends each chunk to the Parseable API (in a stream called testclickstream). Replace the CSV file path, Parseable endpoint, and authentication credentials with your own.
```
import pandas as pd
import requests
import json
# Define the CSV file path
csv_file_path = 'e-shop_clothing_2008.csv'
# Define the Parseable API endpoint
parseable_endpoint = 'https://demo.technocube.in/api/v1/ingest'
# Basic authentication credentials
username = 'admin'
password = 'admin'
headers = {
'Content-Type': 'application/json',
'X-P-Stream': 'testclickstream'
}
# Read and process the CSV file in chunks
chunk_size = 100 # Number of rows per chunk
for chunk in pd.read_csv(csv_file_path, chunksize=chunk_size, delimiter=';'):
# Convert the chunk DataFrame to a list of dictionaries
json_data = chunk.to_dict(orient='records')
# Convert list of dictionaries to JSON string
json_str = json.dumps(json_data)
# Send the JSON data to Parseable
response = requests.post(parseable_endpoint, auth=(username, password), headers=headers, data=json_str)
# Check the response
if response.status_code == 200:
print('Chunk sent successfully!')
else:
print(f'Failed to send chunk. Status code: {response.status_code}')
print(response.text)
```
### Explanation of the Script
We have divided the code's flow into six steps to help you understand its function. This will also help you understand how Pandas libraries and Parseable work together.
**Importing Libraries**
The script starts by importing Pandas for data manipulation, Requests for HTTP requests, and JSON for handling JSON data.
Defining File Path and Endpoint: Specify the path to the CSV file and the Parseable API endpoint. Replace these with your actual file path and API endpoint.
**Authentication and Headers**
Set up basic authentication credentials and headers. The X-P-Stream header indicates the stream or collection name.
Reading CSV in Chunks: Use pd.read_csv to read the CSV file in chunks of 100 rows. The chunk size parameter handles large files efficiently without memory issues.
**Converting Data to JSON**
Convert each chunk to a list of dictionaries using to_dict with orient='records', then to a JSON string.
**Sending Data to Parseable**
Send the JSON data to the Parseable API using a POST request. Check the response status code to ensure successful ingestion. Print any errors.
### Handling Errors and Retries
Network issues or server errors might prevent successful data ingestion in real-world scenarios. To make the script more robust, implement error handling and retries. Also, look for code errors, if any.
### Next Steps
Ingesting data into Parseable using Pandas is straightforward and efficient. By reading data in chunks and converting it to JSON, we can seamlessly send it to the Parseable API.
This script serves as a foundation and is customizable to your specific needs, including sophisticated error handling, logging, or parallel processing.
Follow this guide to integrate Pandas and Parseable effectively, ensuring smooth and efficient data ingestion for your projects.
To get started or try Parseable, [visit our demo page](https://demo.parseable.com/login?q=eyJ1c2VybmFtZSI6ImFkbWluIiwicGFzc3dvcmQiOiJhZG1pbiJ9).
| jenwikehuger |
1,901,896 | Formação Em Desenvolvimento Front-end + React + VUE Gratuita | A Vai na Web está oferecendo uma formação online e gratuita em Desenvolvimento Front-end, com foco em... | 0 | 2024-06-28T13:38:00 | https://guiadeti.com.br/formacao-desenvolvimento-front-end-react-vue/ | cursogratuito, css, cursosgratuitos, frontend | ---
title: Formação Em Desenvolvimento Front-end + React + VUE Gratuita
published: true
date: 2024-06-26 18:36:02 UTC
tags: CursoGratuito,css,cursosgratuitos,frontend
canonical_url: https://guiadeti.com.br/formacao-desenvolvimento-front-end-react-vue/
---
A Vai na Web está oferecendo uma formação online e gratuita em Desenvolvimento Front-end, com foco em React e VUE.
Durante o curso, os alunos receberão aulas sobre Soft Skills, Inteligência Artificial como ferramenta de estudo, Aprendendo a Aprender, Determinação e Foco, entre outros tópicos.
Não é necessário ter conhecimento prévio em programação ou tecnologia, nem conhecimentos avançados em matemática. Todos os nossos cursos emitem certificados para alunos que demonstram dedicação e excelência técnica.
O curso tem duração de 6 meses e as aulas são ao vivo. Aproveite esta oportunidade para se capacitar e transformar sua carreira!
## Formação Desenvolvedor(a) Front-end + React + VUE
A Vai na Web está oferecendo uma formação online e gratuita em Desenvolvimento Front-end, focada em React e VUE. Este curso é uma excelente oportunidade para aqueles que desejam ingressar no mundo do desenvolvimento web.
_Imagem da página do curso_
### Pré-requisitos
- Ter entre 16 e 35 anos de idade;
- Renda familiar até 3 salários mínimos;
- De qualquer lugar do país;
- Disponibilidade de 2 horas por dia, de segunda-feira à sexta-feira;
- Possuir computador ou notebook;
- Possuir acesso à internet.
### Conteúdo Trabalhado
A formação é projetada para ser acessível a todos, sem a necessidade de conhecimento prévio em programação ou tecnologia, nem conhecimentos avançados em matemática.
### Ementa Aulas Técnicas
#### Introdução à Programação
- Fundamentos e sintaxe de HTML;
- Fundamentos e sintaxe de CSS;
- Semântica;
- Acessibilidade;
- Git e Github;
- Responsividade.
#### Lógica de Programação
- Algoritmos
- Estruturas e tipos de dados
- JavaScript
- Sintaxe, Variáveis, Operadores;
- Métodos, Condições, Função;
- Interatividade.
#### Desenvolvimento Front-end
- Biblioteca x Framework
- React, JSX;
- Componentização, Ciclo de Vida;
- Styled-components;
- Hooks, Rotas, Consumo de API;
- Introdução à Vue.js.
### Ementa Soft Skills
- Inteligência Artificial como ferramenta de estudo;
- Aprendendo a Aprender;
- Determinação e foco;
- Comunicação não-violenta;
- O código além do código;
- Ética e privacidade digital;
- Programação Criativa;
- Técnicas autodidatas.
### Certificação e Avaliação
A formação Em Desenvolvimento Front-end + React + VUE emite certificados para alunos que demonstram dedicação e excelência técnica. O curso tem uma duração de 6 meses, com aulas ao vivo.
A avaliação do curso é composta por atividades em sala de aula e desafios práticos enviados via Google Classroom. A presença e as interações durante as aulas também são levadas em consideração.
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## Desenvolvimento Front-end
O desenvolvimento front-end é uma das áreas mais dinâmicas e emocionantes da tecnologia. Ele se concentra na criação da interface do usuário e na experiência do usuário (UX) em aplicações web e móveis.
Os desenvolvedores front-end trabalham com tecnologias como HTML, CSS e JavaScript para construir sites e aplicativos que são visualmente atraentes e funcionais.
### Mercado de Trabalho para Desenvolvedores Front-end
Empresas de todos os setores, desde startups até grandes corporações, estão procurando desenvolvedores front-end para criar e manter suas presenças online.
As oportunidades são variadas, com opções para trabalhar remotamente ou em escritórios tradicionais, dependendo das preferências pessoais e dos requisitos do empregador.
Os salários para desenvolvedores front-end são competitivos e variam com base na localização, experiência e habilidades.
### Ferramentas Essenciais para Desenvolvimento Front-end
HTML (HyperText Markup Language) e CSS (Cascading Style Sheets) são as bases do desenvolvimento front-end. HTML é usado para estruturar o conteúdo da web, enquanto o CSS é usado para estilizar e layout do conteúdo. Ambos são essenciais para criar páginas web bem formatadas e atraentes.
JavaScript é a linguagem de programação fundamental para o desenvolvimento front-end. Ele permite que os desenvolvedores adicionem interatividade às suas páginas web, como animações, formulários dinâmicos e outras funcionalidades que melhoram a experiência do usuário.
### Frameworks e Bibliotecas
- React: Uma biblioteca JavaScript popular para construir interfaces de usuário. É mantida pelo Facebook e uma comunidade de desenvolvedores individuais e empresas.
- Vue.js: Um framework JavaScript progressivo para a construção de interfaces de usuário. Ele é conhecido por sua facilidade de integração com outros projetos e bibliotecas existentes.
- Angular: Um framework JavaScript desenvolvido pelo Google, usado para construir aplicativos web de página única. Ele é conhecido por suas funcionalidades robustas e integração com ferramentas de desenvolvimento.
### Ferramentas de Desenvolvimento
- Visual Studio Code: Um editor de código-fonte altamente popular que suporta várias linguagens de programação, incluindo HTML, CSS e JavaScript.
- Git: Um sistema de controle de versão que permite aos desenvolvedores acompanhar as mudanças em seu código ao longo do tempo. Ferramentas como GitHub e GitLab oferecem repositórios baseados na web para colaboração de código.
- Webpack: Um módulo bundler para JavaScript que permite aos desenvolvedores empacotar vários módulos em um ou mais arquivos, otimizando o desempenho de suas aplicações web.
## Vai na Web
O Vai na Web é uma iniciativa que visa capacitar jovens e adultos para o mercado de tecnologia através de cursos gratuitos e acessíveis.
Fundada com o objetivo de promover a inclusão digital e oferecer oportunidades educacionais, a plataforma se destaca por sua abordagem prática e inovadora, preparando os alunos para as demandas do mercado de trabalho moderno.
### Metodologia de Ensino
A metodologia de ensino do Vai na Web é centrada na prática, proporcionando aos alunos uma experiência de aprendizado hands-on. Os cursos são projetados para simular situações reais do mercado de trabalho, permitindo que os participantes adquiram habilidades técnicas aplicáveis e relevantes.
### Impacto Social
O Vai na Web tem um forte compromisso com a inclusão digital. Oferecendo cursos gratuitos, a plataforma torna a educação em tecnologia acessível a um público mais amplo, incluindo aqueles que podem não ter acesso a recursos educacionais pagos.
## Link de inscrição ⬇️
As [inscrições para a Formação Desenvolvedor(a) Front-end + React + VUE](https://www.inscricao-vainaweb.com/#home) devem ser realizadas no site da Vai na Web.
## Compartilhe esta oportunidade e transforme vidas com a Vai na Web!
Gostou do conteúdo sobre a Formação Em Desenvolvimento Front-end + Gratuita? Então comaprtilhe com a galera!
O post [Formação Em Desenvolvimento Front-end + React + VUE Gratuita](https://guiadeti.com.br/formacao-desenvolvimento-front-end-react-vue/) apareceu primeiro em [Guia de TI](https://guiadeti.com.br). | guiadeti |
1,901,727 | Differences between Asp.net and Asp.net Core | ASP.NET and ASP.NET Core are both frameworks for building web applications and services, but they... | 0 | 2024-06-26T18:34:54 | https://dev.to/pains_arch/differences-between-aspnet-and-aspnet-core-23o7 | aspdotnet, aspnet, development, csharp | **ASP.NET and ASP.NET Core are both frameworks for building web applications and services, but they have several key differences. Here are the main distinctions between the two:**
## 1. Cross-Platform Support
* **ASP.NET:** Primarily designed to run on Windows. It can run on Windows Server and Internet Information Services (IIS).
* **ASP.NET Core:** Cross-platform, running on Windows, macOS, and Linux. It supports different web servers like Kestrel and IIS and can run in containers and cloud environments.
## 2. Performance
* **ASP.NET:** Performance is good but not as optimized as ASP.NET Core.
* **ASP.NET Core:** Highly optimized for performance. It is known for its high throughput and low latency, making it one of the fastest web frameworks available.
## 3. Modularity
* **ASP.NET:** Monolithic framework, where many libraries and features are built-in and used by default.
* **ASP.NET Core:** Modular framework, allowing developers to include only the libraries and features they need. This results in a smaller application footprint and better performance.
## 4. Unified Framework
* **ASP.NET:** Separate frameworks for different tasks (e.g., ASP.NET MVC for web applications, ASP.NET Web API for building APIs).
* **ASP.NET Core:** Unified framework combining MVC, Web API, and Razor Pages into a single programming model, simplifying development.
## 5. Dependency Injection
* **ASP.NET:** Limited and less flexible support for dependency injection, often requiring third-party libraries.
* **ASP.NET Core:** Built-in support for dependency injection, making it easier to manage dependencies and promote better software design practices.
## 6. Configuration and Logging
* **ASP.NET:** Configuration is usually done via web.config files, and logging support is more basic.
* **ASP.NET Core:** Uses a more flexible configuration system that supports various sources (e.g., JSON files, environment variables). It also includes a robust logging framework out of the box.
## 7. Razor Pages
* **ASP.NET:** Does not have a direct equivalent to Razor Pages.
* **ASP.NET Core:** Introduces Razor Pages, a page-based programming model that simplifies the development of page-centric web applications.
## 8. Blazor
* **ASP.NET:** Does not support Blazor.
* **ASP.NET Core:** Includes Blazor, a framework for building interactive web UIs with C#. Blazor WebAssembly runs in the browser, while Blazor Server runs on the server.
## 9. Open Source and Community
* **ASP.NET:** Developed as a closed-source framework initially, with some components later open-sourced.
* **ASP.NET Core:** Fully open-source from the start, with active contributions from the developer community, ensuring continuous improvement and innovation.
## 10. Hosting and Deployment
* **ASP.NET:** Typically hosted on IIS on Windows Server.
* **ASP.NET Core:** More flexible hosting options, including IIS, Kestrel, Nginx, Apache, and can be hosted in various environments like Docker containers and cloud services (e.g., Azure, AWS).
## 11. Cross-Platform Support
* **ASP.NET:** Primarily developed using Visual Studio on Windows.
* **ASP.NET Core:** Supports development with Visual Studio, Visual Studio Code, and the .NET CLI across all supported platforms (Windows, macOS, Linux). | pains_arch |
1,890,422 | Top 5 Must-Ask Questions About Your Career in IT | Navigating the labyrinth of an IT career can sometimes feel like decoding the most complex algorithm.... | 0 | 2024-06-26T18:27:06 | https://dev.to/usulpro/top-5-must-ask-questions-about-your-career-in-it-2245 | career, careerdevelopment, mentorship, beginners | Navigating the labyrinth of an IT career can sometimes feel like decoding the most complex algorithm. But hey, who said challenges aren’t fun? Every question about your career can be a stepping stone to your next big achievement. With IT continually evolving, maintaining a laser focus on career progression, honing in-demand skills, and ensuring job satisfaction requires not just attention but consistency. It’s about asking the right career questions—whether you’re a bright-eyed beginner or a seasoned professional. The landscape of challenges and opportunities is vast, but with the right guidance, every struggle can lead to substantial personal and professional growth.
In this journey of career exploration, I’m going to share insights on some of the most pressing questions about careers in the realm of Information Technology. From understanding the essential skills for success and navigating job transitions to weighing the pros and cons of freelancing versus corporate gigs, and finding ways to dodge the dreaded burnout. Additionally, for those of you starting fresh, we'll discuss tips to make your mark and ensure a smooth sailing career path. Drawing from my own transformation from a novice developer to a tech lead, consider me your career mentor, here to offer coaching, counseling, and a sprinkle of fun advice. So, if you’re ready to tackle career mentoring head-on and navigate the complexities of job satisfaction and career challenges with ease, let’s dive in! And don’t forget to hit me up with your thoughts, or subscribe to my Twitter [@UsulPro](https://twitter.com/UsulPro) for more nuggets of wisdom.
## Question 1: What skills are essential for a successful IT career?
### Technical Skills
In the rapidly evolving field of IT, possessing a robust set of technical skills is crucial. You should consider enhancing your expertise in areas like [cloud computing](https://www.coursera.org/articles/key-it-skills-for-your-career), programming, systems, and networks. For those aiming to delve into IT security, foundational knowledge gained from roles in help desk support, networking, or system administration is invaluable. Programming remains a staple skill, whether for developing software, web applications, or automating tasks. The importance of being adept in managing computer systems and networks cannot be overstated, as these are central to the functionality of any IT team. Additionally, skills in data analysis are becoming increasingly crucial for roles such as database administrators and data engineers. The emerging fields of DevOps and cloud computing also offer new avenues for IT professionals, with skills in these areas opening doors to roles like cloud developer, cloud administrator, and cloud architect.
### Soft Skills
While technical prowess is key, [soft skills are equally essential](https://www.comptia.org/career-change/exploring-it/skills-for-it) to thrive in the IT industry. Communication tops the list, as IT professionals must articulate complex technical issues in understandable terms for diverse audiences. Being organized enhances efficiency, particularly in dynamic IT environments where you may juggle multiple projects. Analytical abilities enable you to diagnose and resolve tech issues effectively. Creativity also plays a significant role; it's not just about solving problems but doing so innovatively. Project management skills are critical, as IT professionals often oversee various projects and must meet deadlines consistently. Furthermore, traits like perseverance, problem-solving, resourcefulness, curiosity, and a genuine interest in helping others are invaluable in fostering a successful IT career.
### Constant Learning and Adaptation
The tech landscape is characterized by rapid changes and continuous innovation. Staying relevant means committing to lifelong learning and regular skill upgrades. Engaging in [continuous learning activities](https://www.linkedin.com/pulse/role-continuous-learning-tech-career-advancement-denzel-owusu-ansah-lagdf), such as online courses, workshops, seminars, and conferences, not only keeps you updated but also opens up opportunities for career advancement. Platforms like Coursera, Udemy, and edX are excellent for pursuing new knowledge and certifications. Additionally, participating in community and open-source projects can provide hands-on experience with real-world challenges, while staying informed through tech blogs, journals, and books is essential for keeping pace with industry trends. Employers play a pivotal role by fostering an environment that encourages learning and application of new skills, benefiting both the organization and its employees.
## Question 2: How do you navigate career transitions in IT?
### Developing a Strategy
Navigating career transitions in IT requires a well-thought-out strategy that aligns with your career goals and personal values. Begin by [assessing your current skills](https://lareinstitute.com/navigating-career-transitions-tips-and-strategies/), interests, and the values that drive you. Research industries and roles that spark your interest and reach out for informational interviews to gain deeper insights. Transitioning may also necessitate acquiring new skills or certifications; consider enrolling in relevant vocational programs or online courses to bridge any skill gaps. A strategic approach to your job search is crucial; tailor your resume for each application, highlight relevant experiences, and leverage job search engines and professional networks to uncover opportunities that align with your new career objectives.
### Seeking Mentorship
Mentorship is invaluable during career transitions. A mentor [provides guidance](https://www.coursera.org/articles/how-to-find-a-mentor), industry insights, and can help you navigate the complexities of the IT field. They offer support in developing in-demand technical skills, understanding industry trends, and setting realistic career goals. To find a mentor, start within your existing network or utilize platforms like LinkedIn to connect with experienced professionals in your desired field. Regularly update your mentor on your progress and be open to feedback, as this will help you refine your approach and advance your career.
### Networking
Effective networking is essential for a successful career transition in IT. [Engage actively on professional networking platforms](https://www.comptia.org/blog/the-role-of-networking-in-building-a-tech-career) such as LinkedIn, join relevant online forums, and participate in tech conferences and career fairs to meet industry professionals. These interactions provide insights into industry trends, help align your skills with market demands, and offer a support system of peers, which is particularly beneficial in today's remote-working era. Remember, networking is not just about making new contacts; it also involves nurturing relationships and sharing your career aspirations with those around you, including friends and family who might offer unexpected connections and opportunities.
## Question 3: What are the pros and cons of freelancing vs. corporate jobs in IT?
### Freelancing Pros and Cons
#### Pros:
1. **Flexibility and Autonomy**: As a freelancer, you can set your own schedule, choose the projects you work on, and make decisions independently. This flexibility appeals especially to caregivers, digital nomads, and those who prefer a non-traditional work environment.
2. **Variety and Potential for Higher Earnings**: Freelancers can work on diverse projects with different clients, which helps in building a varied portfolio. Additionally, with the right skills and market demand, freelancers have the [potential to earn more](https://www.quora.com/Which-is-better-freelancer-or-work-with-a-company) than they would in a corporate job.
3. [**Remote Work Opportunities**](https://www.upwork.com/resources/freelance-vs-employee-pros-and-cons): Being self-employed, freelancers can work from anywhere, embracing the full benefits of remote work. This is particularly advantageous in today’s digital age where remote work is increasingly popular.
#### Cons:
1. **Income Instability and [Lack of Benefits](https://www.quora.com/Which-is-better-freelancer-or-work-with-a-company)**: Freelancers face fluctuations in income and do not receive benefits like health insurance or retirement plans provided by employers. Managing taxes also becomes a personal responsibility, adding to the complexities of freelance work.
2. **Isolation and Work Security**: Working alone can lead to feelings of isolation. Additionally, the lack of job security and potential payment issues from clients can create financial instability and stress.
### Corporate Job Pros and Cons
#### Pros:
1. **Stability and Benefits**: Corporate jobs generally offer a steady income and benefits such as health insurance, paid time off, and retirement plans. These aspects provide a sense of security and ease in personal financial planning.
2. **Career Progression and Structured Growth**: Companies often provide clear pathways for career advancement and skill development, which can be more predictable than the freelance route. Working in a team environment also supports professional growth through collaboration.
#### Cons:
1. **Less Flexibility and Autonomy**: Corporate employees often have less control over their schedules and the projects they work on. They need to adhere to company policies and may have limited decision-making power.
2. **Routine Work and Defined Hours**: Depending on the role, corporate jobs can involve repetitive tasks and typically require adherence to a standard 9-to-5 schedule, which may not align with everyone’s productivity peaks.
### Making an Informed Decision
When deciding between freelancing and a corporate job, consider your personal goals, lifestyle preferences, and work values. Some thrive on the independence and variety that freelancing offers, while others find greater satisfaction in the stability and structured progression of corporate roles. It’s essential to evaluate both sides carefully and choose the path that aligns best with your professional aspirations and personal circumstances.
## Question 4: How can you avoid burnout in your IT career?
### Identifying Signs of Burnout
Recognizing the signs of burnout is your first step in combating it. Burnout manifests through emotional, physical, and behavioral symptoms. You might feel tired and drained almost all the time, experience changes in sleep or eating habits, or suffer from [regular headaches and frequent illnesses](https://thrivingcenterofpsych.com/blog/when-is-it-time-to-change-jobs-8-signs-to-look-for-something-new/). Emotional signs include a feeling of failure, self-doubt, and using unhealthy methods to cope, such as consuming excessive food, alcohol, or drugs. If you find yourself isolating from others and feeling constantly overwhelmed, these could be strong indicators that you're facing burnout. Additionally, if your job starts seeping into your personal life [excessively, leading to irritability and high stress](https://www.pdq.com/blog/signs-its-time-to-leave-your-job-in-it/), it might be time to assess the impact of your work environment on your mental health.
### Strategies for Work-Life Balance
To prevent burnout, establishing a healthy work-life balance is crucial. Start by setting clear boundaries between work and personal time. This might include [setting specific work hours and sticking to them](https://hbr.org/2018/01/when-burnout-is-a-sign-you-should-leave-your-job), and not allowing work commitments to intrude into your personal life. Encourage your workplace to support work-life balance by respecting working hours and not expecting communication outside of these times. Managers can play a significant role by setting an example, ensuring they are not sending emails or setting tasks outside of work hours. Additionally, engaging in activities outside of work that you enjoy can significantly buffer the effects of job stress and help maintain your mental and emotional well-being.
### When to Consider a Job Change
Sometimes, despite best efforts to manage work stressors, a job change may be necessary to escape burnout. Reflect on whether your job allows you to work to your full potential and whether it aligns with your values and interests. If you find yourself constantly facing unrealistic workloads, lack of control over your work, or a toxic work environment, these are valid reasons to consider looking for new opportunities where you can thrive. Before making a switch, evaluate what you appreciate about your current role and seek these qualities in a new position, ensuring a better fit and hopefully, greater job satisfaction.
## Question 5: What tips can help beginners succeed in their IT roles?
### Effective Learning Methods
For those just starting in IT, mastering effective learning methods can significantly enhance your ability to grasp complex concepts and skills. Initiatives like the [Google IT Support program](https://www.indeed.com/career-advice/finding-a-job/how-to-start-a-career-in-it) offer foundational knowledge that's crucial for building your IT career. Additionally, [IBM's IT Support Professional Certificate](https://www.indeed.com/career-advice/finding-a-job/how-to-start-a-career-in-it) program provides hands-on experience with IT fundamentals such as network architecture and cybersecurity in just three months. For more engaged learning, techniques like the SQ3R method and the Feynman Technique help in retaining and understanding information more efficiently. These methods encourage you to summarize what you've learned in your own words, which solidifies your understanding.
### Seeking Opportunities
To excel in the IT field, actively seeking opportunities to apply your skills is key. Start by using your personal connections; sometimes, who you know is as important as what you know. Enhance your visibility to potential employers by maintaining an updated and comprehensive LinkedIn profile, which acts like your digital resume. Participate in virtual networking events such as hackathons or engage with communities on GitHub to connect with other professionals and showcase your skills. For hands-on experience, consider contributing to open-source projects which can provide real-world experience and improve your technical skills.
### Staying Motivated Despite Challenges
Staying motivated can be challenging, especially when faced with the rigorous demands of an IT career. Setting clear, achievable goals can significantly boost your motivation and performance. For instance, setting a daily goal of coding for an hour or completing a small project part each week can create a consistent habit that leads to progress. Additionally, finding intrinsic motivation by focusing on aspects of your work that you enjoy can make even mundane tasks more engaging. If motivation dips, remember the importance of short-term goals and the satisfaction of crossing off small tasks that lead towards your larger career objectives.
## Conclusion
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Throughout this exploration of the IT landscape, we've delved into the essential components that underpin a fruitful career in this dynamic field. From the foundational technical and soft skills necessary for success, strategies for navigating career transitions, to insightful comparisons between freelancing and corporate positions, and methods for avoiding burnout and thriving as a beginner, the discourse aimed to serve as a mentor’s guide. These insights emphasize the importance of continuous learning, adaptability, and maintaining a work-life balance, reinforcing the thesis that a career in IT is both a journey of constant learning and personal growth.
Moreover, as we navigate this endless sea of technological advancements, understanding and leveraging the latest tools, such as headless CMS, becomes pivotal for staying ahead. For those intrigued by the potential of such innovative web technologies, joining our Headless & Composable squad on [daily.dev](https://dly.to/zH1Eak9ysmo) offers a unique opportunity to explore key webdev technologies alongside like-minded professionals. In closing, the journey through the IT career landscape is one of perpetual growth and exploration, where curiosity meets opportunity, and where today’s learners become tomorrow’s leaders.
| usulpro |
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1,901,721 | DevOps for Financial Services: A Guide for Entrepreneurs | The world of finance is changing. FinTech startups are disrupting the traditional landscape with... | 0 | 2024-06-26T18:23:56 | https://dev.to/marufhossain/devops-for-financial-services-a-guide-for-entrepreneurs-4ojn | The world of finance is changing. FinTech startups are disrupting the traditional landscape with innovative apps and services. But building a successful FinTech startup requires more than just a brilliant idea. Streamlined operations and a robust IT infrastructure are crucial for survival in this fast-paced industry. This is where DevOps for financial services comes in. DevOps helps FinTech startups move faster, collaborate better, and build trust with users – all essential ingredients for success.
**Speed Wins the Race: Why DevOps Matters**
The FinTech world doesn't sleep. New trends emerge daily, and customer expectations are constantly evolving. FinTech startups need to be agile and adaptable to stay ahead. DevOps empowers them to achieve this agility by automating manual processes and enabling faster deployments. Imagine a world where you can launch a new mobile payment feature or update your fraud detection system in days, not weeks. DevOps makes this a reality. By automating tasks like testing and deployment, you free up your team to focus on innovation. This increased speed translates to a quicker time-to-market, allowing you to capitalize on new opportunities and respond to changing trends before your competitors.
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Many FinTech startups, especially in their early stages, might have separate development and operations teams. This can lead to communication gaps and inefficiencies. A developer might create a fantastic new feature, but the operations team struggles to deploy it because they weren't involved in the process. DevOps breaks down these silos, fostering communication and collaboration between development and operations. Teams work together throughout the entire software development lifecycle, from planning and coding to testing and deployment. This shared ownership creates a sense of responsibility and ensures everyone is on the same page. When challenges arise, teams can troubleshoot and solve problems together more effectively.
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| marufhossain | |
1,901,720 | 1382. Balance a Binary Search Tree | 1382. Balance a Binary Search Tree Medium Given the root of a binary search tree, return a balanced... | 27,523 | 2024-06-26T18:23:16 | https://dev.to/mdarifulhaque/1382-balance-a-binary-search-tree-1bj8 | php, leetcode, algorithms, programming | 1382\. Balance a Binary Search Tree
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Given the `root` of a binary search tree, return _a **balanced** binary search tree with the same node values_. If there is more than one answer, return **any of them**.
A binary search tree is **balanced** if the depth of the two subtrees of every node never differs by more than `1`.
**Example 1:**
- **Input:** root = [1,null,2,null,3,null,4,null,null]
- **Output:** [2,1,3,null,null,null,4]
- **Explanation:** This is not the only correct answer, [3,1,4,null,2] is also correct.
**Example 2:**
- **Input:** root = [2,1,3]
- **Output:** [2,1,3]
**Constraints:**
- The number of nodes in the tree is in the range <code>[1, 10<sup>4</sup>]</code>.
- <code>1 <= Node.val <= 10<sup>5</sup></code>
**Solution:**
```
/**
* Definition for a binary tree node.
* class TreeNode {
* public $val = null;
* public $left = null;
* public $right = null;
* function __construct($val = 0, $left = null, $right = null) {
* $this->val = $val;
* $this->left = $left;
* $this->right = $right;
* }
* }
*/
class Solution {
/**
* @param TreeNode $root
* @return TreeNode
*/
function balanceBST($root) {
$nums = [];
$this->inorder($root, $nums);
return $this->build($nums, 0, count($nums) - 1);
}
function inorder($root, &$nums) {
if ($root == null)
return;
$this->inorder($root->left, $nums);
$nums[] = $root->val;
$this->inorder($root->right, $nums);
}
function build($nums, $l, $r) {
if ($l > $r)
return null;
$m = (int)(($l + $r) / 2);
return new TreeNode($nums[$m], $this->build($nums, $l, $m - 1), $this->build($nums, $m + 1, $r));
}
}
```
**Contact Links**
- **[LinkedIn](https://www.linkedin.com/in/arifulhaque/)**
- **[GitHub](https://github.com/mah-shamim)**
| mdarifulhaque |
1,901,684 | Running pgAdmin to Manage a PostgreSQL Cluster on Kubernetes | Let’s say you need to do something in PostgreSQL in Kubernetes, and it is inconvenient to work with... | 0 | 2024-06-26T18:14:16 | https://dev.to/dbazhenov/running-pgadmin-to-manage-a-postgresql-cluster-in-kubernetes-616 | percona, kubernetes, postgres, database | Let’s say you need to do something in PostgreSQL in Kubernetes, and it is inconvenient to work with the database in the terminal, or you need to become more familiar with PostgreSQL or SQL commands. In that case, this article comes in handy.
I explain how to run pgAdmin in a Kubernetes cluster to manage PostgreSQL databases deployed in that cluster. This is useful if your PostgreSQL cluster does not have external access and is only available inside a Kubernetes cluster.
[pgAdmin](https://www.pgadmin.org/) is a popular open source tool for managing Postgres databases. It is convenient for creating databases, schemas, tables, viewing data, executing SQL queries, and much more in a user-friendly web interface.
## Running pgAdmin
We need one file that contains deployment and service resources to run pgAdmin in k8s. Let's call it pgadmin.yaml.
pgadmin.yaml
```
apiVersion: apps/v1
kind: Deployment
metadata:
name: pgadmin-deployment
spec:
replicas: 1
selector:
matchLabels:
app: pgadmin
template:
metadata:
labels:
app: pgadmin
spec:
containers:
- name: pgadmin
image: dpage/pgadmin4
ports:
- containerPort: 80
env:
- name: PGADMIN_DEFAULT_EMAIL
value: admin@example.com
- name: PGADMIN_DEFAULT_PASSWORD
value: admin
---
apiVersion: v1
kind: Service
metadata:
name: pgadmin-service
spec:
selector:
app: pgadmin
ports:
- protocol: TCP
port: 80
targetPort: 80
```
Note that the middle of the file contains the login and password for logging into the pgAdmin panel.
```
env:
- name: PGADMIN_DEFAULT_EMAIL
value: admin@example.com
- name: PGADMIN_DEFAULT_PASSWORD
value: admin
```
We need to deploy pgAdmin using this file by running the command.
`kubectl apply -f pgadmin.yaml -n <namespace>`
Let's print out the list of pods in our cluster to get the name pgadmin pod.
`kubectl get pods -n <namespace>`
Now, we just need to run port forwarding for the pgAdmin pod on a free port that will open in the browser. I use port 5050.
`kubectl port-forward pgadmin-deployment-***-*** 5050:80 -n <namespace>`
I can open localhost:5050 in a browser now.
After that, you only need to add a connection to Postgres by clicking Add New Server.
I used the access data that [Percona Everest](https://percona.community/projects/everest) provided me for the Postgres cluster created using it.
Congratulations! We can manage Postgres using the pgAdmin interface or SQL queries. Viewing databases, schemas, and tables and writing SQL queries has become very convenient.
## Remove pgAdmin
Once you are done with pgAdmin and PostgreSQL, all you need to do is to
1. Stop port-forwarding by simply pressing CTRL + C in the terminal.
2. Remove pgAdmin Deployment and Service by running the command.
## About the PostgreSQL cluster on Kubernetes used in the article
In this post, I used the Postgres cluster with three nodes created on Google Kubernetes Engine (GKE) using [Percona Everest](https://percona.community/projects/everest).
Percona Everest is an open source platform that allows you to provision and manage database clusters. I recently wrote about Percona Everest in [A New Way to Provision Databases on Kubernetes](https://dev.to/dbazhenov/a-new-way-to-provision-databases-on-kubernetes-126h). You do not need to worry about PostgreSQL cluster installation and configuration, backups, recovery, or scaling; you can do it in the interface. It enables multi-database and multi-cluster configurations and can be deployed on any Kubernetes infrastructure in the cloud or on-premises.
Documentation: [Create Kubernetes cluster on Google Kubernetes Engine (GKE)](https://docs.percona.com/everest/quickstart-guide/gke.html)
You can use any other cloud or create a local Kubernetes cluster using [minikube](https://minikube.sigs.k8s.io/docs/), [k3d](https://k3d.io) or [kind](https://kind.sigs.k8s.io/).
| dbazhenov |
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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\n\n" | younwary818 |
1,893,900 | Orchestrating Serverless Workflows with Ease using AWS Step Functions | When we talk about running serverless workloads on AWS (disclaimer: serverless doesn’t mean there are... | 0 | 2024-06-26T18:10:42 | https://dev.to/aws-builders/orchestrating-serverless-workflows-with-ease-using-aws-step-functions-3mok | aws, orchestration, stepfunctions | When we talk about running serverless workloads on AWS (disclaimer: serverless doesn’t mean there are no servers, it just means you don’t have to worry about provisioning and managing them), the service that immediately comes to mind is definitely AWS Lambda. This serverless compute service allows developers to run their code in the cloud, all without managing the underlying infrastructure.
Although Lambda offers developers the ability to run their code in the cloud, it does have some constraints that limit its usability in specific scenarios and use cases. One of these constraints is Lambda’s maximum execution time of 15 minutes. Unfortunately, this means developers cannot use Lambda to carry out complex operations that take more than 15 minutes to complete.
However, don’t let this limitation dissuade you from using AWS Lambda! Because this is where AWS Step Functions step in (see what I did there? 😉) to the rescue to make the execution of complex operations possible.
The main objective of this article is to bring the good news of AWS Step Functions to you my dear friend. So grab your digging equipment and without further ado, let’s start digging into it.
## What is AWS Step Functions
Simply put, AWS Step Functions is a state machine service. But what exactly is a state machine? Let’s use an analogy to explain. Imagine your office coffee maker. It sits idle in the kitchen, waiting for instructions to make coffee. When someone uses it, they select the type of coffee, quantity, and other options — these are the states the machine goes through to make a cup of coffee. Once it completes the necessary states, the coffee maker returns to its idle state, ready for the next user. AWS Step Functions allow you to create workflows just like the coffee maker, where you can have your system wait for inputs, make decisions, and process information based on the input variables. With this kind of orchestration, we are able to leverage Lambda functions in ways that are not inherently supported by the service itself. For instance, you can run processes in parallel when you have multiple tasks you want to process at one time or in sequence when order is important. In a similar fashion, you can implement retry logic if you want your code to keep executing until it succeeds, or reaches a time out of some sort. This way, we are able to conquer lambda’s 15 minutes code execution limit.
## How does it work?
Now on to how Step Functions works. It operates by getting your workflow from an Amazon State language file which is a JSON based file that is used to define your state machine and its components. This file defines the order and flow of your serverless tasks in AWS Step Functions. It’s like the recipe for your code workflow. Here is an example of what State language looks like:
```json
{
"StartAt": "SayHello",
"States": {
"SayHello": {
"Type": "Task",
"Resource": "arn:aws:lambda:REGION:ACCOUNT_ID:function:SayHelloFunction",
"Next": "Goodbye"
},
"Goodbye": {
"Type": "Task",
"Resource": "arn:aws:lambda:REGION:ACCOUNT_ID:function:GoodbyeFunction",
"End": true
}
}
}
```
As you can see from the code above, State Language files are written in JSON format, a language familiar to most developers. However, if you’re new to JSON, there’s no need to worry! AWS Step Functions lets you build your state machine by dragging and dropping components (states) to link them in the AWS Step Functions Workflow Studio. Here’s a picture example of what a state machine looks like in the Workflow Studio.
## State Machine State Type
There are eight commonly used core state types that you can define in your workflow to achieve a particular result. These state types are: the Pass state, Task State, Choice State, Wait, Success State, Fail, Parallel State, and Map State. We’ll take a closer look at each of these in more detail.
**_Pass State_** — The Pass state doesn’t actually perform a specific action. Instead, it acts as a placeholder state, facilitating transitions between other states without executing any code. While it can be helpful for debugging purposes, such as testing transitions between states, it’s not exclusively a debugging state.
**_Task State_** — This is where the action happens. As the most common state type, it represents a unit of work, typically executed by an AWS Lambda function or another integrated service.
**_Choice State_** — This state allows you to evaluate an input and then choose the next state for the workflow based on the evaluation outcome. Essentially, it’s an “if-then” operation that enables further application logic execution based on the chosen path.
_**Wait State**_ — In this state, you can pause the state machine for a specified duration or until a specific time is reached. This comes in handy if you want to schedule a pause within the workflow. For example, you can use it to send out emails at 10:00 AM every day.
**_Success State_** — This state is used to indicate the successful completion of a workflow. It can be part of the choice state or to end the state machine in general.
**_Fail State_** — It is termination state similar to the success state but indicates that a workflow failed to complete successfully. Fail states should have an error message and a cause for better workflow understanding and troubleshooting.
**_Parallel State_** — This state executes a group of states as concurrently as possible and waits for each of them to complete before moving on. Imagine you have a large dataset stored in S3 that needs to be processed. You can use a Parallel state to concurrently trigger multiple Lambda functions, each processing a portion of the data set. Doing this will significantly speed up the overall processing time.
**_Map State_** — The Map state allows you to loop through a list of items and perform tasks on them. In the map state, you can define the number of concurrent items to be worked on at one time.
By making use of a combination of these states, you can build dynamic and highly scalable workflows. To find the list of supported AWS service integrations for Step Functions, check out this [AWS documentation](https://docs.aws.amazon.com/step-functions/latest/dg/connect-supported-services.html).
## Conclusion
This article has introduced you to AWS Step Functions and its potential to streamline your application development. Step Functions manages your application’s components and logic, allowing you to write less code and focus on building and updating your application faster. It offers a wide range of use cases, including submitting and monitoring AWS Batch jobs, running AWS Fargate tasks, publishing messages to SNS topics or SQS queues, starting Glue job runs, and much more. If your workflow involves tasks like these, AWS Step Functions can be a valuable asset.
| brandondamue |
1,901,701 | Write | Check out this Pen I made! | 0 | 2024-06-26T18:07:50 | https://dev.to/afzalqwe/write-4ki6 | codepen | Check out this Pen I made!
{% codepen https://codepen.io/Afzal-hosen-Tipu/pen/eYaXYeb %} | afzalqwe |
1,901,699 | How to Analyze a Crypto White Paper | Introduction Understanding a white paper is crucial in crypto. It shows the project's... | 0 | 2024-06-26T18:06:24 | https://dev.to/cryptoavigdor/how-to-analyze-a-crypto-white-paper-542f | cryptocurrency, whitepaper, crypto, presale | ## Introduction
Understanding a white paper is crucial in crypto. It shows the project's goals, technology, and plans. Here's a simple guide on how to analyze a white paper.
## What is a White Paper?
A white paper explains a crypto project's details. It includes the problem, solution, and roadmap. It helps investors decide if the project is worth their time and money.
## Check the Problem and Solution
First, look at the problem the project aims to solve. Is it a real problem? Then, see if the solution is clear and practical. A good white paper should explain this in simple terms.
## Team Information
Check the team behind the project. Are they experienced? Do they have a good track record? Look for LinkedIn profiles or other proof of their expertise.
## Technology and Innovation
Understand the technology used. Is it new or better than existing solutions? The white paper should explain how it works without too much jargon.
## Tokenomics
Look at the [tokenomics section](https://theholycoins.com/blog/crypto-tokenomics-crafting-thriving-economies). This includes how tokens are distributed, their use, and how they gain value. Make sure the distribution is fair and makes sense.
## Roadmap
A clear roadmap is important. It shows the project's timeline and future plans. Check if the goals are realistic and achievable.
## Partnerships
Check for any partnerships mentioned. [Good partnerships](https://www.cvent.com/en/blog/events/5-qualities-successful-partnership) add credibility. Make sure these partnerships are real and beneficial.
## Legal Aspects
Read about the [legal compliance](https://www.thomsonreuters.com/en-us/posts/corporates/compliance-crypto-industry/) of the project. Are they following the rules? Legal issues can affect the project's success.
## Community and Support
A strong community is a good sign. Check social media and forums for community support. A project with good community backing is more likely to succeed.
## Conclusion
Analyzing a white paper is key in crypto investment. Check the problem, solution, team, technology, tokenomics, roadmap, partnerships, legal aspects, and community. This helps you make an informed decision.
By understanding these points, you can better judge the potential of a crypto project. | cryptoavigdor |
1,901,698 | Betfair India - Betfair Betting and Casino Site in India | Betfair, founded in 2000, revolutionized the betting industry by introducing the world’s first... | 0 | 2024-06-26T18:02:37 | https://dev.to/sower9/betfair-india-betfair-betting-and-casino-site-in-india-e4k | Betfair, founded in 2000, revolutionized the betting industry by introducing the world’s first peer-to-peer betting exchange. This innovative platform allows users to bet against each other, rather than against a traditional bookmaker, offering better odds and greater flexibility. By leveraging cutting-edge technology, Betfair provides a secure and transparent environment where bettors can set their own odds and trade positions, much like a stock exchange. This unique approach has set Betfair apart, attracting millions of users worldwide and establishing it as a leader in the online gambling industry [betfair sign up](https://www.bet-fair.app/). | sower9 | |
1,901,696 | Unraid: Das ultimative Tool für deine Heimserver 🚀 | Entdecke Unraid: Flexibles Betriebssystem für Heimserver, unterstützt Docker & VMs. Einfach zu... | 0 | 2024-06-26T18:00:10 | https://blog.disane.dev/unraid-dein-heim-server/ | unraid, homelab, server, nas | Entdecke Unraid: Flexibles Betriebssystem für Heimserver, unterstützt Docker & VMs. Einfach zu installieren, kosteneffizient und perfekt für deine Datenverwaltung. 🚀
---
In der heutigen digitalen Ära, in der Daten und Medieninhalte exponentiell wachsen, ist es entscheidender denn je, eine zuverlässige und flexible Lösung für Heimserver zu haben. Unraid ist eine solche Lösung, die durch ihre Vielseitigkeit und Benutzerfreundlichkeit herausragt. In diesem Artikel werde ich dir zeigen, was Unraid ist, wie es funktioniert und warum es eine ausgezeichnete Wahl für deine Heimserver-Anforderungen ist.
### Was ist Unraid? 🤔
Unraid ist ein Betriebssystem, das speziell für den Einsatz auf Heimservern entwickelt wurde. Es basiert auf Linux und bietet eine einfache, aber leistungsstarke Plattform für das Speichern und Verwalten von Daten. Unraid unterscheidet sich von traditionellen RAID-Systemen durch seine Flexibilität und Benutzerfreundlichkeit.
[Unleash Your HardwareUnraid is an operating system that brings enterprise-class features for personal and small business applications. Configure your computer systems to maximize performance and capacity using any combination of OS, storage devices, and hardware.](https://unraid.net/)
### Kosten und Einschränkungen der Unraid-Free-Variante 💰
Unraid bietet verschiedene Lizenzmodelle, die auf die unterschiedlichen Bedürfnisse und Budgets der Nutzer zugeschnitten sind. Die Free-Variante ist eine ausgezeichnete Möglichkeit, Unraid auszuprobieren, bevor du dich für eine kostenpflichtige Lizenz entscheidest.
#### Lizenzmodelle und Kosten
Unraid bietet drei Hauptlizenzmodelle:
1. **Basic**: Diese Lizenz kostet $59 und unterstützt bis zu 6 Speichergeräte (Festplatten oder SSDs).
2. **Plus**: Für $89 erhältst du Unterstützung für bis zu 12 Speichergeräte.
3. **Pro**: Die umfangreichste Lizenz kostet $129 und bietet Unterstützung für eine unbegrenzte Anzahl an Speichergeräten.
#### Einschränkungen der Free-Variante
Die Free-Variante von Unraid hat einige Einschränkungen, die es dir ermöglichen, das System zu testen, aber nicht die volle Funktionalität zu nutzen:
1. **Begrenzte Speichergeräte**: Die Free-Variante unterstützt nur bis zu drei Speichergeräte, was ausreicht, um die Grundfunktionen zu testen, aber für umfangreichere Setups nicht geeignet ist.
2. **30-Tage-Testzeitraum**: Die Free-Variante ist auf einen 30-tägigen Testzeitraum begrenzt. Nach Ablauf dieser Zeit musst du eine der kostenpflichtigen Lizenzen erwerben, um den Server weiter nutzen zu können.
3. **Eingeschränkte Funktionen**: Einige erweiterte Funktionen und Plugins sind in der Free-Variante möglicherweise nicht verfügbar oder eingeschränkt nutzbar.
#### Warum sich eine kostenpflichtige Lizenz lohnt
Eine kostenpflichtige Unraid-Lizenz bietet erhebliche Vorteile, die weit über die Einschränkungen der Free-Variante hinausgehen. Mit einer Basic-, Plus- oder Pro-Lizenz kannst du:
* Eine größere Anzahl von Speichergeräten nutzen.
* Den vollständigen Funktionsumfang von Unraid genießen, einschließlich Docker-Container und VMs.
* Regelmäßige Updates und Support von der Unraid-Community und den Entwicklern erhalten.
Die Investition in eine kostenpflichtige Lizenz lohnt sich besonders für Nutzer, die eine zuverlässige und skalierbare Lösung für ihre Heimserver- oder Kleinunternehmensanforderungen suchen.
#### Vorteile von Unraid
1. **Flexibles RAID**: Im Gegensatz zu traditionellen RAID-Systemen ermöglicht Unraid die Verwendung von Festplatten unterschiedlicher Größe. Dies bedeutet, dass du alte und neue Festplatten problemlos kombinieren kannst.
2. **Erweiterbarkeit**: Du kannst jederzeit weitere Festplatten hinzufügen, ohne das bestehende Setup neu konfigurieren zu müssen.
3. **Dockers und VMs**: Unraid unterstützt Docker-Container und virtuelle Maschinen, wodurch du Anwendungen und Betriebssysteme direkt auf deinem Server ausführen kannst.
4. **Datensicherheit**: Mit Unraid kannst du Paritätslaufwerke einrichten, die deine Daten vor Festplattenausfällen schützen.
### Systemvoraussetzungen und Installation von Unraid 🔧
#### Systemvoraussetzungen
Bevor du mit der Installation von Unraid beginnst, solltest du sicherstellen, dass dein System die folgenden Mindestanforderungen erfüllt:
1. **Prozessor**: Ein 64-Bit-Prozessor, vorzugsweise ein Intel oder AMD Mehrkernprozessor.
2. **Arbeitsspeicher**: Mindestens 4 GB RAM, empfohlen sind 8 GB oder mehr, insbesondere wenn du Docker-Container und virtuelle Maschinen nutzen möchtest.
3. **Festplatten**: Mindestens zwei Festplatten – eine für die Parität und eine für die Daten. Diese können unterschiedlicher Größe sein.
4. **Netzwerkkarte**: Eine Gigabit-Ethernet-Karte für schnelle Netzwerkverbindungen.
5. **USB-Stick**: Ein USB 2.0 oder 3.0 Stick mit mindestens 1 GB Speicherplatz für die Installation des Unraid-Betriebssystems.
#### Installation von Unraid
Die Installation von Unraid ist einfach und unkompliziert. Hier sind die Schritte, die du befolgen musst:
1. **Download des Unraid-Images**: Besuche die offizielle [Unraid-Website](https://unraid.net/) und lade die neueste Version des Unraid-Installationsimages herunter.
2. **Vorbereitung des USB-Sticks**: Verwende ein Tool wie [Rufus](https://rufus.ie/) oder Etcher, um das heruntergeladene Unraid-Image auf einen USB-Stick zu schreiben. Achte darauf, dass der USB-Stick bootfähig ist.
3. **Booten vom USB-Stick**: Stecke den vorbereiteten USB-Stick in deinen Server und starte ihn neu. Wähle im BIOS/UEFI-Menü deines Computers den USB-Stick als Bootlaufwerk aus.
4. **Unraid-Installation**: Nach dem Booten vom USB-Stick erscheint das Unraid-Bootmenü. Wähle die Standardoption zum Starten von Unraid aus. Unraid wird nun geladen und du wirst aufgefordert, grundlegende Netzwerkeinstellungen vorzunehmen.
5. **Zugriff auf die Web-GUI**: Nachdem Unraid gebootet ist, kannst du über die IP-Adresse deines Servers auf die Web-GUI zugreifen. Gib die IP-Adresse in deinen Webbrowser ein, um die Unraid-Benutzeroberfläche zu öffnen.
6. **Einrichtung des Arrays**: In der Web-GUI kannst du deine Festplatten hinzufügen und konfigurieren. Lege die Paritätslaufwerke fest und erstelle die Daten-Array.
7. **Konfiguration der Shares**: Erstelle freigegebene Ordner (Shares) für deine Daten und richte Benutzerkonten sowie Zugriffsrechte ein.
8. **Aktivierung der Lizenz**: Unraid bietet eine 30-tägige Testversion. Um den vollen Funktionsumfang dauerhaft zu nutzen, musst du eine Lizenz erwerben und diese in der Web-GUI aktivieren.
Mit diesen Schritten hast du Unraid erfolgreich installiert und konfiguriert. Jetzt kannst du alle Vorteile dieser leistungsstarken Plattform nutzen, um deine Daten zu speichern, Docker-Container und virtuelle Maschinen zu betreiben und deinen Heimserver optimal zu verwalten.
### Einrichtung eines Unraid-Servers 🛠️
Die Einrichtung von Unraid ist relativ einfach und erfordert keine tiefgehenden technischen Kenntnisse. Hier ist eine Schritt-für-Schritt-Anleitung:
#### 1\. Vorbereitung der Hardware
Stelle sicher, dass du die erforderliche Hardware hast, einschließlich eines Computers mit mehreren Festplatten. Unraid benötigt mindestens zwei Festplatten – eine für die Parität und eine für die Daten.
#### 2\. Download und Installation
1. **Download**: Lade das Unraid-Installationsimage von der offiziellen Unraid-Website herunter.
2. **USB-Stick vorbereiten**: Erstelle einen bootfähigen USB-Stick mit dem Unraid-Image. Dies kannst du mit Tools wie Rufus oder Etcher erledigen.
3. **Installation**: Boote deinen Computer von dem USB-Stick und folge den Anweisungen auf dem Bildschirm, um Unraid zu installieren.
#### 3\. Konfiguration
1. **Web-GUI-Zugang**: Nach der Installation kannst du über die Web-GUI auf Unraid zugreifen. Gib einfach die IP-Adresse deines Servers in deinen Webbrowser ein.
2. **Einrichtung des Arrays**: Konfiguriere dein Speicher-Array, indem du die Festplatten hinzufügst und die Paritätslaufwerke einrichtest.
3. **Einrichtung von Shares**: Erstelle freigegebene Ordner (Shares) für die verschiedenen Arten von Daten, die du speichern möchtest, z.B. Filme, Musik, Backups usw.
4. **Benutzerverwaltung**: Richte Benutzerkonten ein und weise ihnen Zugriffsrechte auf die Shares zu.
### Verwendung von Docker und VMs mit Unraid 🖥️
Einer der größten Vorteile von Unraid ist die Unterstützung von Docker-Containern und virtuellen Maschinen (VMs). Dies ermöglicht es dir, Anwendungen direkt auf deinem Heimserver auszuführen, ohne zusätzliche Hardware zu benötigen.
#### Docker-Container
Docker-Container sind leichtgewichtige, portable und skalierbare Anwendungen, die in isolierten Umgebungen laufen. Unraid bietet eine benutzerfreundliche Schnittstelle zur Verwaltung von Docker-Containern.
1. **Community Apps**: Über die Community Apps in Unraid kannst du eine Vielzahl von Docker-Containern installieren, z.B. Plex für Medienstreaming, Nextcloud für Dateisynchronisation oder Pi-hole für DNS-Ad-Blocking.
2. **Einfaches Management**: Docker-Container können einfach über die Web-GUI gestartet, gestoppt und konfiguriert werden.
#### Virtuelle Maschinen
Mit Unraid kannst du auch VMs erstellen und verwalten, um verschiedene Betriebssysteme parallel laufen zu lassen.
1. **VM-Erstellung**: Über die Web-GUI kannst du VMs erstellen, indem du ISO-Dateien für die Installation von Betriebssystemen wie Windows, Linux oder macOS verwendest.
2. **Hardware-Passthrough**: Unraid unterstützt Hardware-Passthrough, was bedeutet, dass du bestimmte Hardwarekomponenten direkt einer VM zuweisen kannst, z.B. eine Grafikkarte für Gaming oder Videobearbeitung.
### Vergleich: Traditionelle NAS vs. Unraid 📊
Um die Vorteile von Unraid besser zu verstehen, vergleichen wir es mit traditionellen NAS-Systemen.
| Feature | Traditionelle NAS | Unraid |
| -------------------------- | -------------------------- | ------------------------------- |
| **Festplattenkombination** | Gleiche Größe erforderlich | Unterschiedliche Größen möglich |
| **Erweiterbarkeit** | Begrenzte Skalierbarkeit | Beliebige Erweiterung |
| **Docker-Unterstützung** | Eingeschränkt | Vollständig integriert |
| **VM-Unterstützung** | Eingeschränkt | Vollständig integriert |
| **Kosten** | Teure Hardware | Kostengünstige Hardware |
| **Benutzerfreundlichkeit** | Moderat | Hoch |
### Warum Unraid für dich die richtige Wahl sein könnte 🏆
Unraid bietet eine einzigartige Kombination aus Flexibilität, Benutzerfreundlichkeit und Leistungsfähigkeit, die es zur idealen Lösung für Heimserver macht. Hier sind einige Gründe, warum du Unraid in Betracht ziehen solltest:
1. **Kosteneffizienz**: Du kannst alte Festplatten wiederverwenden und musst keine teuren RAID-Controller kaufen.
2. **Einfache Verwaltung**: Die Web-GUI macht die Verwaltung deines Servers einfach und intuitiv.
3. **Vielseitigkeit**: Mit Docker und VMs kannst du eine Vielzahl von Anwendungen und Betriebssystemen auf deinem Server ausführen.
4. **Datensicherheit**: Paritätslaufwerke und regelmäßige Backups sorgen dafür, dass deine Daten sicher sind.
### Fazit 📃
Unraid ist eine leistungsstarke und flexible Lösung für jeden, der einen Heimserver betreiben möchte. Es bietet eine Vielzahl von Funktionen, die es von traditionellen NAS-Systemen abheben und es zu einer ausgezeichneten Wahl für jeden machen, der seine Daten sicher und effizient verwalten möchte.
Egal ob du ein erfahrener IT-Experte oder ein Heimwerker bist, Unraid bietet die Tools und die Benutzerfreundlichkeit, die du benötigst, um deinen Heimserver optimal zu nutzen.
Der YouTuber "The Geek Freaks" hat hierzu auch eine sehr große und umfangreiche Playlist erstellt:
---
If you like my posts, it would be nice if you follow my [Blog](https://blog.disane.dev) for more tech stuff. | disane |
1,901,694 | Intro to JavaScript Testing: Frameworks, Tools, and Practices | Testing is a super important element of the software development lifecycle, making sure our code is... | 0 | 2024-06-26T17:58:38 | https://dev.to/buildwebcrumbs/intro-to-javascript-testing-frameworks-tools-and-practices-167i | javascript, beginners, testing, webdev | Testing is a super important element of the software development lifecycle, making sure our code is reliable and functional.
Having a flexible approach to testing can significantly better the quality and maintainability of applications.
In this article, we will explore essential testing types, prominent tools and frameworks, and practical practices to help you continuously improve your JavaScript testing strategy.
---
## Understanding Different Types of Testing in JavaScript
1. **Unit Testing**:
- **Definition**: Focuses on verifying the smallest testable parts of an application independently for correct behavior.
- **Tools**: Jest, Mocha combined with Chai, Jasmine.
- **Benefits**: Pinpoints specific areas of improvement in code functionality.
2. **Integration Testing**:
- **Definition**: Examines the interactions between combined units or components to ensure they function together as expected.
- **Tools**: Cypress, TestCafe.
- **Benefits**: Identifies issues in the interaction between integrated components.
3. **End-to-End (E2E) Testing**:
- **Definition**: Simulates real user scenarios to test the complete flow of the application from start to finish.
- **Tools**: Selenium, Puppeteer, Cypress.
- **Benefits**: Ensures the system meets external requirements and functions in its entirety.
---
## Popular JavaScript Testing Frameworks
- **Jest**: Praised for its simplicity and fast setup, particularly effective for projects utilizing React.
- **Mocha**: Known for its flexibility and comprehensive reporting, ideal for both Node.js and browsers.
- **Cypress**: A developer-friendly tool for handling all types of testing needs with minimal configuration.
---
## Effective Practices in JavaScript Testing
- **Keep Tests Clear and Concise**: Simple tests promote easier maintenance and understanding.
- **Embrace Test-Driven Development (TDD)**: Writing tests before code encourages design clarity and reduces bugs.
- **Utilize Mocks and Stubs**: These tools help isolate tests from external dependencies, focusing on the component under test.
- **Implement Continuous Integration (CI)**: Automate testing processes to integrate and validate code changes more frequently.
- **Strive for Meaningful Code Coverage**: Rather than aiming for high percentages, focus on covering critical paths that impact application performance and security.
---
## Have you teste yet?
As JavaScript technologies and applications grow, so does the need for an adaptive testing strategy. By understanding the foundational aspects of testing and integrating adaptable tools and practices, we can make sure that our applications are robust and future-ready.
Continuous learning and improvement in testing practices are key to keeping up with the rapid pace of JavaScript development, so keep learning!
## Stay Connected and Support Us
As you dive into enhancing your JavaScript testing practices, consider supporting our community-driven project on GitHub.
If you find the frameworks and tools discussed here useful, ⭐ **[star our repository](https://github.com/webcrumbs-community/webcrumbs)**.
**Your support inspires us to keep pushing the boundaries of what we can achieve together in the JavaScript ecosystem.**
⭐[Star us on GitHub](https://github.com/webcrumbs-community/webcrumbso) to contribute to our growing community of developers!
Thanks for reading,
Pachi 💚 | pachicodes |
1,901,693 | Cricket Gloves Market by Type, segmentation, growth and forecast 2024-2031 | Cricket Gloves Market The Cricket Gloves Market is expected to grow from USD 1800 Million in 2023 to... | 0 | 2024-06-26T17:56:40 | https://dev.to/reportprime23/cricket-gloves-market-by-type-segmentation-growth-and-forecast-2024-2031-10kf | Cricket Gloves Market
The Cricket Gloves Market is expected to grow from USD 1800 Million in 2023 to USD 2800 Million by 2031, at a CAGR of 4.3% during the forecast period.
Get Sample Report: https://www.reportprime.com/enquiry/sample-report/17961
Cricket Gloves Market Size
Cricket gloves are protective gear worn by players in the sport of cricket to shield their hands and fingers from injuries while batting and keeping wicket. The cricket gloves market research report analyzes the market by type, application, region, and market players. Based on type, the market is segmented into gloves with sizes less than 165 mm, 165 mm to 175 mm, 175 mm to 190 mm, 190 mm to 200 mm, and greater than 210 mm. The application segment includes brand outlets, franchised sports outlets, e-commerce, and others. Geographically, the market is divided into North America, Asia Pacific, Middle East, Africa, Australia, and Europe. The major players in the market include Adidas, Nike, Puma, ASICS, MRF Limited, Gray-Nicolls, Kookaburra Sport, and Cosco (India). Additionally, the report takes into account the regulatory and legal factors specific to market conditions. These factors may include government regulations, safety standards, import/export laws, and licensing requirements. Understanding these factors is crucial in assessing the market environment and ensuring compliance with the law. Overall, this market research report provides comprehensive insights into the cricket gloves market, including its segmentation, key players, applications, and regulatory aspects.
Cricket Gloves Market Top Companies
Adidas
Nike
Puma
ASICS
MRF Limited
Enquire Now: https://www.reportprime.com/enquiry/pre-order/17961
Cricket Gloves Market Segment
The latest trends followed by the cricket gloves market include the adoption of lightweight materials for enhanced agility, grip, and breathability. Manufacturers are also focusing on incorporating advanced non-slip technologies to improve the overall performance and safety of the gloves. Another trend observed is the use of customizable and personalized gloves, allowing players to add their preferred features and designs.
Despite the growth prospects, the cricket gloves market also faces some challenges. One major challenge is the presence of counterfeit and low-quality gloves in the market, which affects the reputation of genuine manufacturers and hampers revenue growth. Moreover, the high cost associated with premium quality gloves may limit the affordability for some players, especially in low-income regions.
Buy the Report: https://www.reportprime.com/checkout?id=17961&price=3590
Cricket Gloves Market by Types
Less Than 165 mm
165 mm to 175 mm
175 mm to 190 mm
190 mm to 200 mm
Greater Than 210 mm
Cricket Gloves Market by Application
Brand Outlets
Franchised Sports Outlets
E-Commerce
Others
This information is sourced from:- https://www.reportprime.com/
To read the full report:- https://www.reportprime.com/cricket-gloves-r17961
| reportprime23 | |
1,901,692 | Windows 11 unsuckifying guide | Here's an incomplete list of tips, tools, and settings to help make Windows 11 suck less. Biggest... | 0 | 2024-06-26T17:53:32 | https://dev.to/thejaredwilcurt/windows-11-unsuckifying-guide-1oc5 | windows, windows11, guide, tutorial | Here's an incomplete list of tips, tools, and settings to help make Windows 11 suck less.
**Biggest pro-tip:** If you are installing Windows 11 fresh, use English-Global instead of English US. This skips installing TikTok, Disney+, LinkedIn, Spotify, etc paid-promotional links everywhere. Also turns off MS Store by default until you set your region to EN-US (if you want to re-enable it).
It is technically possible to create a Win 11 user account without a Microsoft account, but you'll need to look it up as MS keeps trying to make this harder.
1. Go through every single setting on the OS and turn off all the bullshit, spyware, AI, etc.
1. Settings > Accessibility > Visual Effects
* Always show Scrollbars (why the fuck is this disabled by default)
1. Settings > Accessibility > Keyboard
* Sticky/Filter/Toggle Keys: OFF
* Underline Access Keys: ON
* Print Screen opens a stupid fucking program instead of doing print screen: OFF
1. Settings > System > Multitasking > Snap Windows:
* Turn off "Show Snap layouts when I hover over a Window's Maximize button"
* Turn off "Show snap layouts when I drag a window to the top of my screen"
1. Constantly leave feedback as you try to do common basic shit and Windows just sucks now and has no option to make it unsuck
* **Example:** https://old.reddit.com/r/Windows11/comments/s3f2y9/please_separate_calendar_and_notifications/
1. RegEdit: [Make Scrollbars wider](https://www.tenforums.com/tutorials/79875-change-size-scroll-bars-windows-10-a.html)
* `HKCU\Control Panel\Desktop\WindowMetrics`
* Double click `ScrollHeight` and `ScrollWidth`
* Enter a value between `-120` (thinner) to `-1500` (thicker) and click OK. (`-255` is probably fine)
* Restart to apply.
1. RegEdit: [Stop sending start menu searches to Bing's servers](https://www.howtogeek.com/826967/how-to-disable-bing-in-the-windows-11-start-menu/)
* `HKCU\SOFTWARE\Policies\Microsoft\Windows`
* Right-Click `Windows` > New > Key > `Explorer`
* Right-Click `Explorer` > New > DWORD32 > `DisableSearchBoxSuggestions`
* Double-Click `DisableSearchBoxSuggestions` > `1` (Hex) > OK
* Restart Explorer or computer to apply
1. [Replace the start menu which is filled with ads and widget bullshit](https://github.com/Open-Shell/Open-Shell-Menu/releases)
* [Replace Windows 11 logo with Windows 7 logo](https://github.com/Open-Shell/Open-Shell-Menu/discussions/1942)
1. RegEdit: [Bring back the original right click menu](https://answers.microsoft.com/en-us/windows/forum/all/restore-old-right-click-context-menu-in-windows-11/a62e797c-eaf3-411b-aeec-e460e6e5a82a)
* Run `reg.exe add "HKCU\Software\Classes\CLSID\{86ca1aa0-34aa-4e8b-a509-50c905bae2a2}\InprocServer32" /f /ve`
* Restart Explorer or computer to apply
1. [Turn off rounded corners on every window](https://github.com/valinet/Win11DisableRoundedCorners)
* **IMPORTANT:** Make sure only one `dwm.exe` is running before executing. Do not run this remotely, run it on the actual machine.
1. [Chris Titus Win Util (Win 11 Debloating/Spam removal)](https://github.com/ChrisTitusTech/winutil)
* This utility does a TON of things, be very careful and read everything before applying changes as many settings it offers are bonkers and it even warns you not to do them. But it also does a ton of very useful things.
* [Intro Video for it](https://www.youtube.com/watch?v=5_AaHXrelTE)
1. The notification sounds on W11 might as well not exist, they are so soft and quiet and barely noticeable even when you are right in front of the computer, let alone in the other room when you want to hear the sounds.
* Download a sound pack: https://winsounds.com
* Go to Settings > Sound > More sound Settings > Sounds
* Select each sound in the list, click Test to hear it, then replace it with your downloaded sounds.
* When done, save your scheme | thejaredwilcurt |
1,901,689 | Ratatui Audio with Rodio: Sound FX for Rust Text-based UI | Ratatui audio with Rodio 🔊 adding sound effects to a 🦀 Rust Text-based user interface or Terminal app using the Rodio crate. | 0 | 2024-06-26T17:47:13 | https://rodneylab.com/ratatui-audio-with-rodio/ | rust, gamedev, tui | ---
title: "Ratatui Audio with Rodio: Sound FX for Rust Text-based UI"
published: "true"
description: "Ratatui audio with Rodio 🔊 adding sound effects to a 🦀 Rust Text-based user interface or Terminal app using the Rodio crate."
tags: "rust, gamedev, tui"
canonical_url: "https://rodneylab.com/ratatui-audio-with-rodio/"
cover_image: "https://dev-to-uploads.s3.amazonaws.com/uploads/articles/ysihz6f822dpc2zr7f1x.png"
---
## 🔊 Adding Sound FX to a Ratatui Game
In this post, we look at Ratatui audio with Rodio. I have been building a text-based User Interface (**TUI**) game in Ratatui. Ratatui is Rust tooling for **Terminal** apps. This is the third post in the series. I wrote the initial post once I had put together a minimal viable product, and outlined some next steps in that post. In the last post, I added fireworks to the victory screen by painting in a Ratatui canvas widget.
As well as fireworks, another enhancement that I identified (in the first post) was sound effects. I have built Rust games with sound before, but relied on the game’s tooling to add manage loading the audio assets and playing them (<a href="https://rodneylab.com/rust-for-gaming/#rust-for-gaming-macroquad">Macroquad</a> and <a href="https://rodneylab.com/rust-for-gaming/#rust-for-gaming-bevy">Bevy</a>, for example, make this seamless). So, the first step was going to be finding a crate to play **MP3 audio**. I discovered Rodio, which worked well, and was quick to get going with.
In the rest of this post, I talk about the Rodio integration, and some next steps for the game. There is a link to the latest project repo, with full code further down.
## 🧱 Ratatui Audio with Rodio: What I Built
I didn’t really want background music, just sound effects to play when the player starts the challenge, and then to provide audio feedback if their latest solution attempt was good or perfect. Finally, I wanted to play some audio when each firework on the victory screen ignited. I found some quite small wave files for each of these, and converted them to MP3s.
## About Rodio
Rodio uses a number of lower level crates under the hood, simplifying adding audio via their single higher level API. These, lower-level, crates include:
- `cpal` for playback;
- `symphonia` for MP4 and AAC playback;
- `hound` for WAV playback;
- `lewton` for Vorbis playback; and
- `claxon` for FLAC playback.
I just needed MP3s, so disabled default features, and only added `symphonia-mp3` back in the project `Cargo.toml`, to keep the binary size in check:
```toml
[package]
name = "countdown-numbers"
version = "0.1.0"
edition = "2021"
license = "BSD-3-Clause"
repository = "https://github.com/rodneylab/countdown-numbers"
# ratatui v0.26.3 requires 1.74.0 or newer
rust-version = "1.74"
description = "Trying Ratatui TUI 🧑🏽🍳 building a text-based UI number game in the Terminal 🖥️ in Rust with Ratatui immediate mode rendering."
[dependencies]
num_parser = "1.0.2"
rand = "0.8.5"
ratatui = "0.27.0"
rodio = { version = "0.18.1", default-features = false, features = ["symphonia-mp3"] }
```
## 🐎 Adding Rodio
The <a href="https://docs.rs/rodio/latest/rodio/">Rodio docs</a> give a couple of examples for getting going. Those examples read and decode an ogg file from a local folder within the project. This makes uses of the Rodio decoder struct, either appending it to a Rodio sink, or playing decoder output directly on an output stream. Either way, the audio is decoded and played straight away.
That setup works well for longer files, played once. For the game, I have a few sound effects that might be played dozens of times. It seemed a little extravagant to read from a file and decode each time I needed to play the same sound effect. Luckily, I found a <a href="https://stackoverflow.com/questions/67988070/how-to-read-a-file-from-within-a-move-fnmut-closure-that-runs-multiple-times">Stack Overflow post with an alternative approach</a>, letting you buffer the decoder output. Since the audio files were no bigger that `10 KB`, I was happy to buffer them as the app starts up and keep them in memory.
### Rust Code
I created a `SoundEffects` struct for holding all the sound effects, as there are only five of them. For an app with more, I would attempt a cleaner solution, but this approach keeps things simple for what I have.
```rust
use std::{fs::File, path::Path};
use rodio::{
source::{Buffered, Source},
Decoder,
};
pub struct SoundEffects {
pub start: Buffered<Decoder<File>>,
pub end: Buffered<Decoder<File>>,
pub perfect: Buffered<Decoder<File>>,
pub valid: Buffered<Decoder<File>>,
pub firework: Buffered<Decoder<File>>,
}
fn buffer_sound_effect<P: AsRef<Path>>(path: P) -> Buffered<Decoder<File>> {
let sound_file = File::open(&path)
.unwrap_or_else(|_| panic!("Should be able to load `{}`", path.as_ref().display()));
let source = Decoder::new(sound_file).unwrap_or_else(|_| {
panic!(
"Should be able to decode audio file `{}`",
path.as_ref().display()
)
});
source.buffered()
}
impl Default for SoundEffects {
fn default() -> Self {
SoundEffects {
start: buffer_sound_effect("./assets/start.mp3"),
end: buffer_sound_effect("./assets/end.mp3"),
perfect: buffer_sound_effect("./assets/perfect.mp3"),
valid: buffer_sound_effect("./assets/valid.mp3"),
firework: buffer_sound_effect("./assets/firework.mp3"),
}
}
}
```
The default initializer for the `SoundEffects` struct just creates a buffered decoding for each of the effects, which can be called later from the app code.
In app code, I can then clone one of these buffers and add it to a sink to play it. For example in the main game loop:
```rust
fn run_app<B: Backend>(terminal: &mut Terminal<B>, app: &mut App) -> io::Result<()> {
// ...TRUNCATED
let (_stream, stream_handle) = OutputStream::try_default().unwrap();
let sink = Sink::try_new(&stream_handle).unwrap();
let sound_effects = SoundEffects::default();
loop {
if event::poll(timeout)? {
if let Event::Key(key) = event::read()? {
// ...TRUNCATED
match app.current_screen {
// ...TRUNCATED
CurrentScreen::PickingNumbers => match key.code {
KeyCode::Enter => {
if app.is_number_selection_complete() {
app.current_screen = CurrentScreen::Playing;
sink.append(sound_effects.start.clone());
}
}
}
}
}
}
// TRUNCATED...
}
}
```
We initialize the sink ahead of the main loop, then play the buffered sound from within it (line `19`), by calling `sink.append()`. `sink.append()` pushes the buffer into a queue and plays it immediately (if nothing is already playing), or waits until the last sound has finished before starting. That setup works here, and if you need to play sounds simultaneously, you can create multiple sinks. This setup also avoids borrow checker issues with consuming the `File` struct, which might arise when decoding the `File` within the main loop.
## 🙌🏽 Ratatui Audio with Rodio: Wrapping Up
In this Ratatui audio with Rodio post, I briefly ran through how I added audio to the Ratatui Countdown game. In particular, I talked about:
- why I **added Rodio**;
- why **you might buffer Rodio to avoid borrow checker issues in a game loop**; and
- how I **buffered MP3 sound FX with Rodio**.
I hope you found this useful. As promised, you can <a href="https://github.com/rodneylab/countdown-numbers">get the full project code on the Rodney Lab GitHub repo</a>. I would love to hear from you, if you are also new to Rust game development. Do you have alternative resources you found useful? How will you use this code in your own projects?
## 🙏🏽 Ratatui Audio with Rodio: Feedback
If you have found this post useful, see links below for further related content on this site. Let me know if there are any ways I can improve on it. I hope you will use the code or starter in your own projects. Be sure to share your work on X, giving me a mention, so I can see what you did. Finally, be sure to let me know ideas for other short videos you would like to see. Read on to find ways to get in touch, further below. If you have found this post useful, even though you can only afford even a tiny contribution, please <a aria-label="Support Rodney Lab via Buy me a Coffee" href="https://rodneylab.com/giving/">consider supporting me through Buy me a Coffee</a>.
Finally, feel free to share the post on your social media accounts for all your followers who will find it useful. As well as leaving a comment below, you can get in touch via <a href="https://twitter.com/messages/compose?recipient_id=1323579817258831875">@askRodney</a> on X (previously Twitter) and also, join the <a href="https://matrix.to/#/%23rodney:matrix.org">#rodney</a> Element Matrix room. Also, see <a aria-label="Get in touch with Rodney Lab" href="https://rodneylab.com/contact/">further ways to get in touch with Rodney Lab</a>. I post regularly on <a href="https://rodneylab.com/tags/gaming/">Game Dev</a> as well as <a href="https://rodneylab.com/tags/rust/">Rust</a> and <a href="https://rodneylab.com/tags/c++/">C++</a> (among other topics). Also, <a aria-label="Subscribe to the Rodney Lab newsletter" href="https://newsletter.rodneylab.com/issue/latest-issue">subscribe to the newsletter to keep up-to-date</a> with our latest projects.
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