Arrays are one of the most important parts of JavaScript. Often, we need to loop through arrays and perform some action — like doubling numbers, filtering values, or adding everything together. JavaScript gives us some very useful methods: forEach()...
1. forEach() Function The forEach() method is used to execute a provided function once for each element in an array. It does not return a new array; it simply iterates over the array. Syntax: array.forEach(callback(currentValue, index, array)); cal...
Filter The filter method creates a new array with all elements that pass a test implemented by the provided function. It doesn't change the original array but returns a new one based on the specified condition. Example: const products = [ { id: 1, ...
Expert-Level Explanation Array methods in JavaScript are functions that can be used to perform operations on arrays. These include map, filter, reduce, and forEach, each serving a different purpose. Creative Explanation Think of array methods as diff...
Introduction A function that can take another function as an argument, or that returns a function as a result, is known as a Higher-Order Function(HOF). They are a special type of function that can be used to create more complex and powerful funct...
1. What is a map()? In a very crude definition, in JavaScript, the .map() function goes through each item in a list (called an array). It makes some changes to each item and gives you a new list with those changed items. 2. Why is it required? The pu...
💡 In this article, you will learn more about Mapping, how it makes the project easier, and how it can be reused. I had a hard time understanding JavaScript's mapping functions until I came across a project using React (a JavaScript framework). Thr...
Overview: JavaScript is a powerful programming language that provides developers with many built-in functions that can help the developer to manipulate data in many different ways. Three of these functions are map(), filter(), and reduce(). In this b...
Interview Question: If you can guess the output of the below code successfully then you can skip this blog :) Code: let input_array=[1,6,3,7,9,2]; let updated_array=input_array.map((element)=>{ return element<4; }) console.log(updated_array); If...
A map is a collection of elements where each element is stored as a Key, value pair. It remembers the original insertion order of the keys. A key in the Map may only occur once; it is unique in the Map's collection. Iteration happens in insertion ord...
