JavaScript Dev

JavaScript Dev


JavaScript forEach Method By Example

Today we are going to show how to use JavaScript forEach Array Method & how it works. We will give an easy example of forEach array function.

The JavaScript Array Method – forEach () imposes a specific function for each item in a particular array individually. Javascript Array forEach provided functions can perform any kind of operation on the elements of the given array.

JavaScript forEach Array Method


  • JavaScript Array forEach() Method Syntax
  • forEach() Method Example
  • Output

JavaScript Array forEach() Method Syntax

array.forEach(function(currentValue, index, arr), thisValue)
  • currentValue In forEach method, value of the current element
  • index In forEach, array index of the current element
  • arr forEach array object the current element belongs to

forEach() Method Example 1

 var num = [18, 12, 10, 15];
 num.forEach(function(item) {


 // return 

18 12 10 15

forEach() Method Example 2

var num = [2, 5, 10, 12];
var newArr = [];




// return


Note : The JavaScript Example to calculate square root of given numbers in array

The JavaScript forEach functions code example here. We take a number array name num and it have used with forEach. This forEach functions return the simple values

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Buddha Community

JavaScript forEach Method By Example
Coy  Roberts

Coy Roberts


Javascript Array forEach() Method Example

Javascript array foreach is an inbuilt function that can be used to execute a function on each item in the array. The forEach() method is called on the array Object and is passed the function that is called on each item in the array.  The  callback function can also take the second parameter of the index in case you need to reference the index of the current element in the array.

Understanding Javascript Array forEach

In a nutshell, Javascript forEach() method executes a provided function once for each array element. Javascript forEach only be used on the Arrays, Maps, and  Sets. This article briefly describes how to use the forEach() method to iterate the items of the array in JavaScript.

What’s the usual thing you do with an  array? Add or remove items from an array. Iterate through its items! This is where the forEach() array method shines.

Before we dive into seeing how forEach() works, we need to take a look at how looping works. Looping is a fundamental computer science concept. If you want to be a sound programmer, mastering loops are amidst the first steps you need to take.

Here’s an example of a for loop in Javascript.

let languages = ['Python', 'Javascript', 'PHP', 'Golang'];

for (i = 0; i < languages.length; i++) {

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Javascript Foreach Example | Javascript Array forEach()

Javascript array forEach() is an inbuilt function that executes the provided function once for each array item. The forEach() array method is used to iterate through each item in an array. When using forEach, we have to specify a callback function. This callback function will be executed on each item in the array.

The method is called on the array  Object and is passed the function that is called on each item in the  array. It can only be used on the  Arrays, Maps, and  Sets.

The  callback function can also take a second parameter of an index in case you need to reference the index of the current item in the array.

Javascript forEach

The syntax for the forEach Javascript function is the following.

array.forEach(function(currentValue, index, arr), thisValue)

The currentValue is the current item in an array that is iterating right now.

The index an optional parameter, which is the current element index of an array.

The arr is an optional parameter, which is an  array object that is the current element belongs to.

The thisValue is an optional parameter that is the value to be passed to the function to be used as its “this” value.

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Rahul Jangid


What is JavaScript - Stackfindover - Blog

Who invented JavaScript, how it works, as we have given information about Programming language in our previous article ( What is PHP ), but today we will talk about what is JavaScript, why JavaScript is used The Answers to all such questions and much other information about JavaScript, you are going to get here today. Hope this information will work for you.

Who invented JavaScript?

JavaScript language was invented by Brendan Eich in 1995. JavaScript is inspired by Java Programming Language. The first name of JavaScript was Mocha which was named by Marc Andreessen, Marc Andreessen is the founder of Netscape and in the same year Mocha was renamed LiveScript, and later in December 1995, it was renamed JavaScript which is still in trend.

What is JavaScript?

JavaScript is a client-side scripting language used with HTML (Hypertext Markup Language). JavaScript is an Interpreted / Oriented language called JS in programming language JavaScript code can be run on any normal web browser. To run the code of JavaScript, we have to enable JavaScript of Web Browser. But some web browsers already have JavaScript enabled.

Today almost all websites are using it as web technology, mind is that there is maximum scope in JavaScript in the coming time, so if you want to become a programmer, then you can be very beneficial to learn JavaScript.

JavaScript Hello World Program

In JavaScript, ‘document.write‘ is used to represent a string on a browser.

<script type="text/javascript">
	document.write("Hello World!");

How to comment JavaScript code?

  • For single line comment in JavaScript we have to use // (double slashes)
  • For multiple line comments we have to use / * – – * /
<script type="text/javascript">

//single line comment

/* document.write("Hello"); */


Advantages and Disadvantages of JavaScript

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Hire Dedicated JavaScript Developers -Hire JavaScript Developers

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Niraj Kafle


The essential JavaScript concepts that you should understand

As a JavaScript developer of any level, you need to understand its foundational concepts and some of the new ideas that help us developing code. In this article, we are going to review 16 basic concepts. So without further ado, let’s get to it.

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