JavaScript

JavaScript

5/26/2025, 7:08:48 PM

Python Coding Challenge 👇👇 https://whatsapp.com/channel/0029VaiM08SDuMRaGKd9Wv0L/1661

JavaScript

5/26/2025, 12:48:03 PM

*Some Useful JavaScript tricks:* 1. *Quick Boolean Conversion*: Use `!!value` to convert any value to true/false instantly. 2. *Default Parameters*: Set default values in functions like `function greet(name = "Guest")` to avoid undefined errors. 3. *Template Literals*: Build dynamic strings easily: `` `Hello, ${name}!` ``. 4. *Destructuring*: Extract values from arrays/objects in one line: `let [x, y] = ;` or `let {name, age} = person;`. 5. *Debounce/Throttle Events*: Prevent performance issues on scroll/resize by debouncing or throttling event handlers. 6. *Replace All in Strings*: Use regex with `/g` flag: `"potato potato".replace(/pot/g, "tom")` gives `"tomato tomato"`. 7. *Memory Management*: Use `AbortController` to clean up event listeners and avoid memory leaks. *React ❤️ for more*

JavaScript

5/28/2025, 10:01:35 AM

*JavaScript interview questions with answers*! 🚀 1. *What are the different data types in JavaScript?* String, Number, Boolean, Undefined, Null, Symbol, BigInt, and Object. 2. *What is hoisting in JavaScript?* Hoisting is JavaScript’s behavior of moving variable and function declarations to the top of their scope before code execution. 3. *Explain closures.* A closure is a function that remembers its outer scope even after the outer function has finished executing. 4. *What is the difference between `==` and `===`?* `==` checks for value equality with type conversion, while `===` checks for both value and type equality. 5. *What are first-class functions?* Functions in JavaScript can be assigned to variables, passed as arguments, and returned from other functions—making them first-class citizens. 6. *What is a promise?* A promise is an object that represents the eventual completion or failure of an asynchronous operation. 7. *How do you handle errors in JavaScript?* By using `try`, `catch`, and `finally` blocks to catch and manage exceptions. 8. *What is an IIFE?* Immediately Invoked Function Expression—runs as soon as it’s defined. 9. *What are arrow functions?* Arrow functions are a shorter syntax for writing functions, introduced in ES6, and they don’t have their own `this`. 10. *What is event delegation?* Event delegation lets you handle events at a parent level instead of adding listeners to individual child elements. *React ❤️ for more*

JavaScript

5/27/2025, 8:01:14 AM

*JavaScript Interview Questions with Answers*: 1. *What are the different data types in JavaScript?* JavaScript has string, number, boolean, null, undefined, object, and symbol data types. 2. *What is hoisting in JavaScript?* Hoisting means variable and function declarations are moved to the top of their scope before code execution, so you can use them before they're defined. 3. *What’s the difference between == and ===?* `==` checks for value equality with type conversion, while `===` checks for both value and type equality. 4. *What is a closure?* A closure is a function that remembers its outer scope even after the outer function has finished executing. 5. *What are promises in JavaScript?* Promises handle asynchronous operations, letting you run code after an async task completes (resolved) or fails (rejected). React ♥️ for more!

JavaScript

5/26/2025, 7:53:17 AM

Beginner in JavaScript? 🧵 Must Learn these Topics: - Variables: var/let/const - Operators - Syntax - Arrays - Data Types - Conditionals Statements - Loops - Objects & Classes - Functions & Scope - Arrow Functions - JSON data - DOM - Async/Await - Events *React ❤️ for more*

JavaScript

5/28/2025, 5:38:59 AM

*Don't overwhelm to learn JavaScript, JavaScript is only this much* 1.Variables • var • let • const 2. Data Types • number • string • boolean • null • undefined • symbol 3.Declaring variables • var • let • const 4.Expressions Primary expressions • this • Literals • [] • {} • function • class • function* • async function • async function* • /ab+c/i • string • ( ) Left-hand-side expressions • Property accessors • ?. • new • new .target • import.meta • super • import() 5.operators • Arithmetic Operators: +, -, *, /, % • Comparison Operators: ==, ===, !=, !==, <, >, <=, >= • Logical Operators: &&, ||, ! 6.Control Structures • if • else if • else • switch • case • default 7.Iterations/Loop • do...while • for • for...in • for...of • for await...of • while 8.Functions • Arrow Functions • Default parameters • Rest parameters • arguments • Method definitions • getter • setter 9.Objects and Arrays • Object Literal: { key: value } • Array Literal: [element1, element2, ...] • Object Methods and Properties • Array Methods: push(), pop(), shift(), unshift(), splice(), slice(), forEach(), map(), filter() 10.Classes and Prototypes • Class Declaration • Constructor Functions • Prototypal Inheritance • extends keyword • super keyword • Private class features • Public class fields • static • Static initialization blocks 11.Error Handling • try, • catch, • finally (exception handling) ADVANCED CONCEPTS 12.Closures • Lexical Scope • Function Scope • Closure Use Cases 13.Asynchronous JavaScript • Callback Functions • Promises • async/await Syntax • Fetch API • XMLHttpRequest 14.Modules • import and export Statements (ES6 Modules) • CommonJS Modules (require, module.exports) 15.Event Handling • Event Listeners • Event Object • Bubbling and Capturing 16.DOM Manipulation • Selecting DOM Elements • Modifying Element Properties • Creating and Appending Elements 17.Regular Expressions • Pattern Matching • RegExp Methods: test(), exec(), match(), replace() 18.Browser APIs • localStorage and sessionStorage • navigator Object • Geolocation API • Canvas API 19.Web APIs • setTimeout(), setInterval() • XMLHttpRequest • Fetch API • WebSockets 20.Functional Programming • Higher-Order Functions • map(), reduce(), filter() • Pure Functions and Immutability 21.Promises and Asynchronous Patterns • Promise Chaining • Error Handling with Promises • Async/Await 22.ES6+ Features • Template Literals • Destructuring Assignment • Rest and Spread Operators • Arrow Functions • Classes and Inheritance • Default Parameters • let, const Block Scoping 23.Browser Object Model (BOM) • window Object • history Object • location Object • navigator Object 24.Node.js Specific Concepts • require() • Node.js Modules (module.exports) • File System Module (fs) • npm (Node Package Manager) 25.Testing Frameworks • Jasmine • Mocha • Jest *React ❤️ for more*

JavaScript

5/28/2025, 6:42:50 PM

🔰 *Learn JavaScript In 3 Minutes*👇

JavaScript

5/26/2025, 10:26:34 AM

*JavaScript essentials* every beginner should know in 2025: 1. *Variables & Data Types*: Learn about `let`, `const`, and `var`, plus types like string, number, boolean, array, and object. 2. *Operators & Expressions*: Get comfortable with arithmetic, comparison, logical, and assignment operators. 3. *Functions*: Understand function declarations, expressions, arrow functions, and concepts like closure and hoisting. 4. *Control Structures*: Use `if`, `else`, `switch`, loops (`for`, `while`, `forEach`) to control program flow. 5. *ES6 Features*: Master arrow functions, template literals, destructuring, spread/rest operators, and modules for modern code. 6. *DOM Manipulation*: Learn how JavaScript interacts with HTML using the DOM—select elements, change content/styles, and handle events. 7. *Objects & Arrays*: Work with objects and arrays, including methods for adding, removing, and updating data. 8. *Asynchronous JS*: Handle async code with callbacks, promises, and `async/await`. 9. *Debugging*: Use browser dev tools to debug and test your code. *React ❤️ for more*

JavaScript

5/25/2025, 4:03:29 PM

Don't overwhelm to learn JavaScript, JavaScript is only this much 1.Variables • var • let • const 2. Data Types • number • string • boolean • null • undefined • symbol 3.Declaring variables • var • let • const 4.Expressions Primary expressions • this • Literals • [] • {} • function • class • function* • async function • async function* • /ab+c/i • string • ( ) Left-hand-side expressions • Property accessors • ?. • new • new .target • import.meta • super • import() 5.operators • Arithmetic Operators: +, -, *, /, % • Comparison Operators: ==, ===, !=, !==, <, >, <=, >= • Logical Operators: &&, ||, ! 6.Control Structures • if • else if • else • switch • case • default 7.Iterations/Loop • do...while • for • for...in • for...of • for await...of • while 8.Functions • Arrow Functions • Default parameters • Rest parameters • arguments • Method definitions • getter • setter 9.Objects and Arrays • Object Literal: { key: value } • Array Literal: [element1, element2, ...] • Object Methods and Properties • Array Methods: push(), pop(), shift(), unshift(), splice(), slice(), forEach(), map(), filter() 10.Classes and Prototypes • Class Declaration • Constructor Functions • Prototypal Inheritance • extends keyword • super keyword • Private class features • Public class fields • static • Static initialization blocks 11.Error Handling • try, • catch, • finally (exception handling) ADVANCED CONCEPTS 12.Closures • Lexical Scope • Function Scope • Closure Use Cases 13.Asynchronous JavaScript • Callback Functions • Promises • async/await Syntax • Fetch API • XMLHttpRequest 14.Modules • import and export Statements (ES6 Modules) • CommonJS Modules (require, module.exports) 15.Event Handling • Event Listeners • Event Object • Bubbling and Capturing 16.DOM Manipulation • Selecting DOM Elements • Modifying Element Properties • Creating and Appending Elements 17.Regular Expressions • Pattern Matching • RegExp Methods: test(), exec(), match(), replace() 18.Browser APIs • localStorage and sessionStorage • navigator Object • Geolocation API • Canvas API 19.Web APIs • setTimeout(), setInterval() • XMLHttpRequest • Fetch API • WebSockets 20.Functional Programming • Higher-Order Functions • map(), reduce(), filter() • Pure Functions and Immutability 21.Promises and Asynchronous Patterns • Promise Chaining • Error Handling with Promises • Async/Await 22.ES6+ Features • Template Literals • Destructuring Assignment • Rest and Spread Operators • Arrow Functions • Classes and Inheritance • Default Parameters • let, const Block Scoping 23.Browser Object Model (BOM) • window Object • history Object • location Object • navigator Object 24.Node.js Specific Concepts • require() • Node.js Modules (module.exports) • File System Module (fs) • npm (Node Package Manager) 25.Testing Frameworks • Jasmine • Mocha • Jest *React ❤️ for more*