How to Check If an Array Index Exists in JavaScript

How to Check If an Array Index Exists in JavaScript

Here are three ways to check if an array index exists in JavaScript. Using the in operator Checking against undefined Using the hasOwnProperty method Method 1: Using the in operator The in operator in JavaScript returns true if the specified property/index exists and false otherwise. let arr = [10, 20, 30]; console.log(1 in arr); console.log(5 … Read more

How to Create an Empty Object in JavaScript

How to Create an Empty Object in JavaScript

Here are two primary ways to create an empty Object in JavaScript. Using the Object Literal syntax ({ }) Using the Object Constructor (new Object()) Method 1: Using the Object Literal syntax ({ }) The most easy and clean way to create an empty Object in JavaScript is to use the Object literal syntax ({ … Read more

What is the Fastest way to convert JavaScript NodeList to Array

What is the Fastest way to convert JavaScript NodeList to Array

The fastest way to convert NodeList to Array in JavaScript is to use the “Array.prototype.from()” method. The Array.prototype.from() method is used to create a shallow-copied new Array instance from an array-like or iterable object. Syntax let main_arr = Array.from(nodelist) Example let nodelist = document.querySelectorAll(‘div’); let main_arr = Array.from(nodelist); console.log(main_arr); for (let val of main_arr) { … Read more

How to Find the First Element of an Array Matching a Condition in JavaScript

How to Find the First Element of an Array Matching a Condition in JavaScript

Here are two ways to find the first element of an array matching a condition in JavaScript. Using Array.prototype.find() Using Array.prototype.filter() Method 1: Using Array.prototype.find() To find the first element of an array matching a condition in JavaScript, use the “Array.prototype.find()” method. The find() method accepts a callback function as its argument and returns the … Read more

How to Convert a Map to Array in JavaScript

How to Convert an Map to Array in JavaScript

Here are three ways to convert a Map to an Array in JavaScript. Using the “Array.from()” and “Map.keys()” Using the “Spread operator” and “Map.keys()” Using “for..of loop” Method 1: Using the Array.from() and Map.keys() The Array.prototype.from() method creates a new array instance from an iterable object, such as a Map. It can conjunction with the … Read more

How to Return the Response from an Asynchronous Call in JavaScript

How to Return the Response from an Asynchronous Call in JavaScript

Here are three ways to return the response from an Asynchronous Call in JavaScript. Promises with async/await (ES2017+) Promises with then() (ES2015+) Callback function Method 1: Promises with async/await (ES2017+) The ECMAScript version released in 2017 introduced syntax-level support for asynchronous functions. With the help of async and await, you can write asynchronous code in … Read more