اکنون در دسترس! پژوهش تلگرام ۲۰۲۵ — مهمترین بینشهای سال 
Web development
رفتن به کانال در Telegram
Web development learning path Frontend and backend resources. HTML, CSS, JavaScript, React, APIs and project ideas. Join 👉 https://rebrand.ly/bigdatachannels DMCA: @disclosure_bds Contact: @mldatascientist
نمایش بیشتر4 146
مشترکین
+224 ساعت
+107 روز
+4930 روز
در حال بارگیری داده...
کانالهای مشابه
ابر برچسبها
اشارات ورودی و خروجی
---
---
---
---
---
---
جذب مشترکین
ژوئن '26
ژوئن '26
+9
در 0 کانالها
مه '26
+114
در 1 کانالها
Get PRO
آوریل '26
+155
در 1 کانالها
Get PRO
مارس '26
+84
در 0 کانالها
Get PRO
فوریه '26
+81
در 0 کانالها
Get PRO
ژانویه '26
+104
در 9 کانالها
Get PRO
دسامبر '25
+76
در 0 کانالها
Get PRO
نوامبر '25
+92
در 1 کانالها
Get PRO
اکتبر '25
+82
در 0 کانالها
Get PRO
سپتامبر '25
+71
در 0 کانالها
Get PRO
اوت '25
+61
در 0 کانالها
Get PRO
ژوئیه '25
+91
در 0 کانالها
Get PRO
ژوئن '25
+85
در 0 کانالها
Get PRO
مه '25
+78
در 0 کانالها
Get PRO
آوریل '25
+81
در 0 کانالها
Get PRO
مارس '25
+89
در 1 کانالها
Get PRO
فوریه '25
+120
در 0 کانالها
Get PRO
ژانویه '25
+279
در 1 کانالها
Get PRO
دسامبر '24
+319
در 1 کانالها
Get PRO
نوامبر '24
+133
در 0 کانالها
Get PRO
اکتبر '24
+180
در 1 کانالها
Get PRO
سپتامبر '24
+117
در 2 کانالها
Get PRO
اوت '24
+129
در 1 کانالها
Get PRO
ژوئیه '24
+148
در 0 کانالها
Get PRO
ژوئن '24
+181
در 0 کانالها
Get PRO
مه '24
+175
در 1 کانالها
Get PRO
آوریل '24
+216
در 0 کانالها
Get PRO
مارس '24
+300
در 0 کانالها
Get PRO
فوریه '24
+422
در 2 کانالها
Get PRO
ژانویه '24
+387
در 0 کانالها
Get PRO
دسامبر '23
+342
در 1 کانالها
Get PRO
نوامبر '23
+9
در 0 کانالها
Get PRO
اکتبر '23
+15
در 0 کانالها
Get PRO
سپتامبر '23
+549
در 0 کانالها
| تاریخ | رشد مشترکین | اشارات | کانالها | |
| 03 ژوئن | +4 | |||
| 02 ژوئن | +4 | |||
| 01 ژوئن | +1 |
پستهای کانال
| 2 | What is the primary trade-off of using an event-driven, single-threaded architecture (like Node.js) compared to multi-threaded servers? | 226 |
| 3 | ▎Common Node.js Terms
1. Node.js: An open-source, cross-platform JavaScript runtime environment that allows developers to execute JavaScript code on the server side.
2. NPM (Node Package Manager): The default package manager for Node.js, used to install, share, and manage dependencies in Node.js applications.
3. Express.js: A minimal and flexible Node.js web application framework that provides a robust set of features for building web and mobile applications.
4. Middleware: Functions in Express.js that have access to the request and response objects, allowing developers to execute code, modify requests and responses, and end requests.
5. Asynchronous Programming: A programming paradigm in Node.js that allows operations to run concurrently without blocking the main execution thread, often using callbacks, promises, or async/await syntax.
6. Event Loop: The mechanism that allows Node.js to perform non-blocking I/O operations by offloading operations to the system kernel whenever possible.
7. Callback: A function passed as an argument to another function that is executed after a certain event or operation has completed.
8. Promise: An object representing the eventual completion (or failure) of an asynchronous operation and its resulting value, providing a cleaner alternative to callbacks.
9. Async/Await: Syntactic sugar built on top of promises that allows developers to write asynchronous code in a more synchronous manner, improving readability.
10. RESTful API: An architectural style for designing networked applications that rely on stateless communication and standard HTTP methods (GET, POST, PUT, DELETE) to interact with resources.
11. Socket.io: A library for real-time web applications that enables bi-directional communication between clients and servers over WebSockets.
12. Mongoose: An Object Data Modeling (ODM) library for MongoDB and Node.js, providing a schema-based solution for modeling application data.
13. Cluster Module: A built-in Node.js module that enables the creation of child processes that share the same server port, allowing for better utilization of multi-core systems.
14. Environment Variables: Key-value pairs used to configure applications at runtime, often containing sensitive information like API keys and database connection strings.
15. Stream: An abstract interface for working with streaming data in Node.js, allowing for efficient processing of large amounts of data without loading everything into memory at once.
16. File System (fs) Module: A built-in Node.js module that provides an API for interacting with the file system, allowing developers to read, write, and manipulate files and directories.
17. Package.json: A JSON file that contains metadata about a Node.js project, including its dependencies, scripts, and configuration settings.
18. Debugging: The process of identifying and resolving issues or bugs in a Node.js application, often using tools like the built-in debugger or external libraries like debug.
19. Web Framework: A framework built on top of Node.js that simplifies web application development by providing tools and libraries for routing, middleware, and templating. Examples include Express.js and Koa.js.
20. Deployment: The process of making a Node.js application available on a server or cloud platform so that it can be accessed by users over the internet. Common platforms include Heroku, AWS, and DigitalOcean. | 242 |
| 4 | 400+ javascript questions .pdf | 666 |
| 5 | ✅ JavaScript Advanced Concepts You Should Know 🔍💻
These concepts separate beginner JS from production-level code. Understanding them helps with async patterns, memory, and modular apps.
1️⃣ Closures
A function that "closes over" variables from its outer scope, maintaining access even after the outer function returns. Useful for data privacy and state management.
function outer() {
let count = 0;
return function inner() {
count++;
console.log(count);
};
}
const counter = outer();
counter(); // 1
counter(); // 2
2️⃣ Promises & Async/Await
Promises handle async operations; async/await makes them read like sync code. Essential for APIs, timers, and non-blocking I/O.
// Promise chain
fetch(url).then(res => res.json()).then(data => console.log(data)).catch(err => console.error(err));
// Async/Await (cleaner)
async function getData() {
try {
const res = await fetch(url);
const data = await res.json();
console.log(data);
} catch (err) {
console.error(err);
}
}
3️⃣ Hoisting
Declarations (var, function) are moved to the top of their scope during compilation, but initializations stay put. let/const are block-hoisted but in a "temporal dead zone."
console.log(x); // undefined (hoisted, but not initialized)
var x = 5;
console.log(y); // ReferenceError (temporal dead zone)
let y = 10;
4️⃣ The Event Loop
JS is single-threaded; the event loop processes the call stack, then microtasks (Promises), then macrotasks (setTimeout). Explains why async code doesn't block.
5️⃣ this Keyword
Dynamic binding: refers to the object calling the method. Changes with call site, new, or explicit binding.
const obj = {
name: "Sam",
greet() {
console.log(`Hi, I'm ${this.name}`);
},
};
obj.greet(); // "Hi, I'm Sam"
// In arrow function, this is lexical
const arrowGreet = () => console.log(this.name); // undefined in global
6️⃣ Spread & Rest Operators
Spread (...) expands iterables; rest collects arguments into arrays.
const nums = [1, 2, 3];
const more = [...nums, 4]; // [1, 2, 3, 4]
function sum(...args) {
return args.reduce((a, b) => a + b, 0);
}
sum(1, 2, 3); // 6
7️⃣ Destructuring
Extract values from arrays/objects into variables.
const person = { name: "John", age: 30 };
const { name, age } = person; // name = "John", age = 30
const arr = [1, 2, 3];
const [first, second] = arr; // first = 1, second = 2
8️⃣ Call, Apply, Bind
Explicitly set 'this' context. Call/apply invoke immediately; bind returns a new function.
function greet() {
console.log(`Hi, I'm ${this.name}`);
}
greet.call({ name: "Tom" }); // "Hi, I'm Tom"
const boundGreet = greet.bind({ name: "Alice" });
boundGreet(); // "Hi, I'm Alice"
9️⃣ IIFE (Immediately Invoked Function Expression)
Self-executing function to create private scope, avoiding globals.
(function() {
console.log("Runs immediately");
let privateVar = "hidden";
})();
🔟 Modules (import/export)
ES6 modules for code organization and dependency management.
// math.js
export const add = (a, b) => a + b;
export default function multiply(a, b) { return a * b; }
// main.js
import multiply, { add } from './math.js';
console.log(add(2, 3)); // 5
💡 Practice these in a Node.js REPL or browser console to see how they interact. | 341 |
| 6 | What is the primary function of a CDN (Content Delivery Network) edge cache? | 319 |
| 7 | ▎Common React.js Terms
1. Component: A reusable piece of UI that can manage its own state and lifecycle. Components can be functional or class-based.
2. JSX (JavaScript XML): A syntax extension for JavaScript that allows writing HTML-like code within JavaScript, commonly used to define React components.
3. Props (Properties): A mechanism for passing data from parent components to child components. Props are read-only and help in making components dynamic.
4. State: An object that determines the behavior and rendering of a component. Unlike props, state is managed within the component and can change over time.
5. Lifecycle Methods: Special methods in class components that allow developers to hook into different stages of a component's lifecycle, such as componentDidMount, componentDidUpdate, and componentWillUnmount.
6. Hooks: Functions that let you use state and other React features in functional components. Common hooks include useState, useEffect, and useContext.
7. Virtual DOM: A lightweight representation of the actual DOM that React uses to optimize rendering performance by minimizing direct manipulation of the real DOM.
8. React Router: A library for managing navigation and routing in a React application, allowing for dynamic rendering of components based on URL paths.
9. Higher-Order Component (HOC): A pattern for reusing component logic by creating a function that takes a component and returns a new component with additional props or functionality.
10. Context API: A feature that allows for sharing values (like state) between components without explicitly passing props through every level of the component tree.
11. Redux: A state management library often used with React to manage global application state through a unidirectional data flow, using actions and reducers.
12. Reducer: A pure function in Redux that takes the current state and an action as arguments and returns a new state, used to manage state transitions.
13. Action: An object that describes an event or change in the application state, typically containing a type and optional payload.
14. Thunk: A middleware for Redux that allows action creators to return functions instead of plain action objects, enabling asynchronous operations.
15. Fragment: A lightweight wrapper that allows grouping multiple elements without adding extra nodes to the DOM, used to return multiple children from a component.
16. Portal: A feature that allows rendering a component's children into a different part of the DOM tree, outside of its parent hierarchy.
17. Memoization: A performance optimization technique that involves caching the results of expensive function calls to avoid unnecessary recalculations.
18. Controlled Component: A form element whose value is controlled by React state, ensuring that the React component is the single source of truth for the input value.
19. Uncontrolled Component: A form element that maintains its own internal state and is not directly controlled by React, often using refs to access its value.
20. React DevTools: A browser extension that provides debugging tools for inspecting React component hierarchies, props, state, and performance metrics. | 346 |
| 8 | Angular Roadmap.pdf | 338 |
| 9 | 🔐Authentication vs. Authorization 🛂
These two terms sound almost identical, but they represent two completely different steps in web security. Mixing them up can lead to massive security holes in your application.
🔹 1. Authentication (AuthN): "Who are you?"
Authentication is the process of verifying the identity of a user. It’s the very first step. The system checks if you are who you claim to be.
• Common Methods: Entering a username/password, using Fingerprint/FaceID, or logging in via Google/GitHub.
• Success means: "Yes, this is definitely John Doe."
🔹 2. Authorization (AuthZ): "What are you allowed to do?"
Authorization happens after authentication. Once the system knows who you are, it checks your permissions to see what parts of the app you can access.
• Common Examples: Can this user delete a post? Can they see the admin billing page? Are they a "Premium" member or a "Free" member?
• Success means: "John Doe is logged in, but he is NOT an admin, so he cannot delete this user."
🔹 3. The "Airport Analogy" (Easy to Remember!)
• Authentication: Showing your Passport at the security desk. It proves your identity.
• Authorization: Showing your Boarding Pass. It proves you have permission to sit in a specific seat or enter the VIP lounge.
🔹 4. How they are implemented
• Authentication Tools:
• JWT (JSON Web Tokens): For stateless mobile/web apps.
• Sessions/Cookies: Traditional server-side login.
• OAuth: Letting users log in via "Sign in with Google."
• Authorization Tools:
• RBAC (Role-Based Access Control): Assigning roles like "Admin," "Editor," or "User."
• ABAC (Attribute-Based Access Control): Permissions based on specific rules (e.g., "Only the author can edit this post").
🔹 5. Key Takeaway
You can be Authenticated (logged in) but NOT Authorized (no permission) to see a specific page. This is why you sometimes see a 403 Forbidden error instead of a 401 Unauthorized error.
👉 Authentication is the door; Authorization is the floor you’re allowed to visit!
🎯 What you should do
✔️ Distinguish between identity (AuthN) and permissions (AuthZ)
✔️ Identify which error codes (401 vs 403) belong to which concept
✔️ Use roles to manage what users can do in your app | 393 |
| 10 | In a relational database, which normal form specifically eliminates transitive dependencies? | 358 |
| 11 |  👨💻 JavaScript Event Loop: A Complete Guide
If you’ve ever been confused why your JavaScript code runs in unexpected order, why setTimeout doesn’t always fire exactly when you want, or how async/await actually works under the hood, you’re not alone.
Most developers use promises and async code daily but still get surprised by bugs that come from not fully understanding the event loop.
This practical guide breaks it all down clearly:
✅ How the JavaScript Event Loop really works behind the scenes ✅ Call Stack, Web APIs, Callback Queue, and Microtask Queue explained
✅ The difference between setTimeout, Promises, and async/await
✅ Common mistakes that cause blocking or unexpected behavior
✅ Real-world examples and mental models you can actually use
🔗 Read the Full Guide Here
@web_dev_bds | 403 |
| 12 | 🤫 JavaScript Closures (The "Hidden" Power) 🧠
Closures are one of those JavaScript concepts that are heard everywhere but often remain a mystery.
🔹 1. What is a Closure?
A closure is the combination of a function and the lexical environment within which that function was declared. Essentially, a closure has access to its outer function's scope, variables, and parameters, even after the outer function has finished executing.
🔹 2. How They Work (The "Memory" of Functions)
When a function is created, it "remembers" the environment (variables, parameters) where it was created. If this function is passed around or returned from another function, it carries that remembered environment with it.
Example:
function outerFunction() {
let outerVariable = "I'm from the outer scope";
function innerFunction() { // This is the closure
print(outerVariable); // It can still access outerVariable!
}
return innerFunction;
}
const myClosure = outerFunction(); // outerFunction finishes, but its scope is remembered
myClosure(); // Calling the inner function
Output: I'm from the outer scope
🔹 3. Common Use Cases
• Data Privacy (Private Variables): You can create functions that have access to "private" variables that cannot be accessed directly from the outside.
Example:
function createCounter() {
let count = 0; // Private variable
return function() { // The closure
count++;
print(count);
};
}
const counter1 = createCounter();
counter1(); // Output: 1
counter1(); // Output: 2
const counter2 = createCounter(); // Creates a *new* closure with its own 'count'
counter2(); // Output: 1
Notice counter1 and counter2 have their own separate count.
• Callback Functions: When you pass a function to another function (like setTimeout or event handlers), it often forms a closure.
• Currying & Partial Application: Advanced techniques where functions are transformed to return new functions.
🔹 4. The "Gotcha" (Loop Issue)
A classic mistake is using var inside a for loop to create functions that reference loop variables. Because var has function scope, all closures created inside the loop end up referencing the *last* value of the loop variable.
Example (The Problem):
// DON'T DO THIS with `var`
for (var i = 0; i < 3; i++) {
setTimeout(function() {
print(i); // Will print 3, 3, 3!
}, 100);
}
🔹 5. The Fix (Using let or IIFEs)
Using let (which has block scope) or an Immediately Invoked Function Expression (IIFE) solves the loop issue by creating a new scope for each iteration.
Example (The Fix with let):
for (let i = 0; i < 3; i++) { // 'let' creates a new 'i' for each loop
setTimeout(function() {
print(i); // Will correctly print 0, 1, 2!
}, 100);
}
🎯 What you should do
✔️ Understand that functions "remember" their creation environment
✔️ See how closures enable data privacy
✔️ Recognize and fix the common loop variable "gotcha" | 354 |
| 13 | What does 'git rebase' primarily achieve for commit history? | 326 |
| 14 | 50 JavaScript Interview Questions .pdf | 414 |
| 15 | Which JavaScript method converts JSON text into an object? | 490 |
| 16 | 📘 Git Internals
✍️ Author: Scott Chacon
🗓 Year: 2008
📄 Pages: 121
🧠 This book is aimed at the developer who does not particularly like Subversion, Perforce or whatever SCM system they are currently using, has heard good things about Git, but doesn't know where to start or why it's so wonderful. It is meant to explain Git as simply as possible in a clean, concise, easily readable volume. The goal is to help you understand Git internals as well as usage at a fundamental level by the time you finish this book.
#Git | 478 |
| 17 | 📦 Webpack & Bundlers (Modern JS Build Tools)
Modern web applications often consist of hundreds (or thousands!) of JavaScript files, CSS, images, and other assets. Simply loading all of these separately would make your website incredibly slow. This is where Bundlers come in.
🔹 1. The "Problem" (Why we need them)
• Too Many Files: Browsers have limits on how many requests they can make simultaneously. Many small files mean many slow network requests.
• Browser Incompatibility: Newer JavaScript features (like import/export or async/await) aren't supported by all older browsers.
• Optimization: Raw code isn't optimized for production (large file sizes, hard to cache).
🔹 2. What are Bundlers? (The Solution)
A bundler is a tool that takes all your individual project assets (JS, CSS, images, fonts, etc.) and bundles them into a smaller number of optimized files, ready for the browser. Think of it like a smart factory for your code.
🔹 3. Key Features & What They Do
• Bundling: Combines multiple JavaScript files (and other assets) into one or a few output files. Fewer requests = faster loading.
• Transpilation: Uses tools like Babel to convert modern JavaScript code (ES6+) into older, widely supported JavaScript (ES5) for broader browser compatibility.
• Minification/Uglification: Removes unnecessary characters (whitespace, comments) and shortens variable names to reduce file size.
• Code Splitting: Instead of one giant bundle, it splits your code into smaller, "on-demand" chunks, so the browser only loads what's needed for the current view.
• Asset Management: Can import and process images, fonts, CSS preprocessors (Sass/Less), and other non-JS files directly from your JavaScript.
🔹 4. How it Works (Simplified)
1. Entry Point: You tell the bundler where your application starts (e.g., src/index.js).
2. Dependency Graph: The bundler reads this file, sees what it imports, then what those files import, building a complete map of all your project's code.
3. Processing (Loaders/Plugins): It applies specific rules (e.g., "use Babel for JS files," "compress images") to each piece of code.
4. Output: It generates optimized, bundled files (like bundle.js, main.css) in a dist/ or build/ folder, ready for deployment.
🔹 5. Common Bundlers
• Webpack: The most popular and highly configurable. (Often comes pre-configured with React via Create React App).
• Rollup: Great for libraries, focuses on efficiency.
• Parcel: Zero-config, easy for smaller projects.
• Vite: A newer, very fast alternative that uses native ES modules during development.
🎯 What you should do
✔️ Understand why bundling is crucial for web performance
✔️ Learn how bundlers optimize and transform your code
✔️ Recognize the role of tools like Webpack in modern development | 416 |
| 18 | Which ACID property ensures all or nothing transaction completion? | 377 |
| 19 | 30+ ChatGPT Prompts for Web Developers.pdf | 703 |
| 20 | ▎Common Web Development Terms
1. HTML (HyperText Markup Language): The standard markup language used for creating web pages. It structures the content on the web.
2. CSS (Cascading Style Sheets): A stylesheet language used to describe the presentation of HTML documents, including layout, colors, and fonts.
3. JavaScript: A programming language that enables interactive web pages and is an essential part of web development. It allows for dynamic content manipulation.
4. DOM (Document Object Model): A programming interface for web documents that represents the structure of a document as a tree of objects, allowing for dynamic changes to the content and structure.
5. API (Application Programming Interface): A set of rules and protocols for building and interacting with software applications, enabling communication between different systems or components.
6. HTTP (HyperText Transfer Protocol): The protocol used for transferring data over the web. It defines how messages are formatted and transmitted.
7. HTTPS (HTTP Secure): An extension of HTTP that provides secure communication over a computer network by encrypting data using SSL/TLS.
8. Frontend: The client-side part of a web application that users interact with directly, typically involving HTML, CSS, and JavaScript.
9. Backend: The server-side part of a web application that handles data processing, storage, and business logic, often involving databases and server-side languages like Node.js, Python, or Ruby.
10. Framework: A pre-built collection of code and tools that provides a foundation for developing applications more efficiently. Examples include React, Angular, and Django.
11. Library: A collection of pre-written code that developers can use to optimize tasks without having to write code from scratch. Examples include jQuery and Lodash.
12. Responsive Design: An approach to web design that ensures web pages render well on various devices and screen sizes by using flexible layouts, images, and CSS media queries.
13. SEO (Search Engine Optimization): The practice of optimizing web pages to improve their visibility in search engine results, aiming to increase organic traffic.
14. Version Control: A system that records changes to files over time, allowing developers to track revisions and collaborate more effectively. Git is a popular version control system.
15. Deployment: The process of making a web application available for use on a server or hosting platform after development is complete.
16. CMS (Content Management System): A software application that allows users to create, manage, and modify content on a website without needing specialized technical knowledge. Examples include WordPress and Joomla.
17. Web Hosting: A service that provides the infrastructure and resources necessary to store and serve websites on the internet.
18. SSL (Secure Sockets Layer): A standard security technology for establishing an encrypted link between a web server and a browser, ensuring secure data transmission.
19. Accessibility (a11y): The practice of making websites usable for people with disabilities by following guidelines and standards that enhance usability for all users.
20. Progressive Web App (PWA): A type of application software delivered through the web that combines the best of web and mobile apps, providing offline capabilities, push notifications, and fast loading times. | 501 |
