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Array.prototype.myMap = function(callback) let tempArray = []; for (let i = 0; i < this.length; i++) // 'this' refers to the array calling myMap tempArray.push(callback(this[i], i, this)); return tempArray; ; // Test const arr = [1, 2, 3]; const double = arr.myMap((num) => num * 2); console.log(double); // [2, 4, 6] Use code with caution. Polyfill for Array.prototype.filter

JavaScript is a language, meaning it executes one task at a time. To handle asynchronous operations without blocking the main thread, it relies on the Event Loop . Call Stack: Executes synchronous code.

Instead of adding event listeners to dozens of individual child elements, you attach a single listener to a parent element. The parent analyzes the event target property ( e.target ) to determine which child triggered the event. This saves substantial memory and setup time.

Interviewers frequently ask you to write native methods from scratch to test your understanding of prototypes and callbacks. javascript happy rawat javascript interview questions pdf free best

Websites like LeetCode or HackerRank are fantastic for testing your algorithmic thinking in JavaScript.

7. Explain the JavaScript Event Loop, Macrotask, and Microtask queues

Based on his curriculum, you should focus on these core areas: Call Stack: Executes synchronous code

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Debouncing limits the rate at which a function gets invoked. It ensures a function is only called after a certain amount of time has elapsed since it was last triggered (e.g., search bar typing). javascript

Speak out loud while writing code. Interviewers evaluate your thought process and communication skills just as much as your final code syntax. This saves substantial memory and setup time

Asynchronous programming is the backbone of modern web applications. Interviewers love to probe this area deeply. How Does the Event Loop Work?

Browser threads handle asynchronous tasks like setTimeout , DOM events, or fetch requests.