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Interview question based on setTimeout and Closures

Mar 4, 20254 min read

JavaScript Functions: Declarations, Expressions, and First-Class Citizens

Feb 28, 20252 min read

Understanding the JavaScript Engine, Browser power, Call Stack, and Asynchronous Operations

The Browser and Its JavaScript Engine The browser has a built-in JavaScript engine responsible for executing JavaScript code. The Call Stack always resides inside this engine and handles synchronous code execution. However, the browser is much more p...

Mar 20, 20254 min read

Scope, Scope chain ,Lexical and Closures

Feb 24, 20255 min read

undefined vs not defined in JavaScript:

Feb 22, 20252 min read

JavaScript Hoisting

In JavaScript, hoisting is a behavior where variable and function declarations are moved to the top of their containing scope during the execution phase. This allows you to access variables and functions even before they are declared in the code. Hoi...

Feb 21, 20257 min read

How JavaScript Runs Code

Everything in JavaScript happens inside an execution context. An execution context is like a big box that contains all the types of code in JavaScript. The execution context is divided into two parts: Memory Code In the memory part, JavaScript st...

Feb 20, 20255 min read

Block and shadowing in javascript

Block Referring to is grouping multiple statements together inside a block (curly braces {}) in JavaScript. This is often done when JavaScript expects a single statement but you want to execute multiple statements in that context Example: if (true) {...

Feb 14, 20252 min read

React 19 useTransition() hook

In React 18 When a user wants to change their name, the process typically involves typing the new name into an input box and then clicking the submit button (which triggers an API call). After submitting, we receive a response. In this case, we need ...

Feb 9, 20253 min read

promise in javascript

Before promises, we handled asynchronous operations using callback functions, but callbacks are not a good way to handle asynchronous operations. Callbacks: Callback functions are passed as arguments to asynchronous functions(fetchData) and are exec...

Feb 7, 202514 min read

async and await keyword

Before the async/await keywords, we handled promises like this: const p = new Promise((resolve, reject) => resolve("resolved promise")); p.then((res) => { console.log(res); }); console.log("hello"); JavaScript doesn't "suspend" execution when ha...

Feb 5, 20255 min read

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