If you want to make forEach Over an Array in JavaScript then you need to check this article and example. Also, we attached a file for you, you can download and will get full resources.

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forEach Method – How to Loop Through an Array in JavaScript

one of the several ways to loop through arrays method is the JavaScript forEach. So, each method has individual and different features, and it is up to you, depending on what you are doing, to decide which one to use.

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Whatever, we are going to take a closer look at the JavaScript forEach method with an example below:

Firstly, we consider that we have the following array as like below:

const numbers = [1, 2, 3, 4, 5];

Here, we are using the traditional “for loop” to loop through the array would be like this below:

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

What makes the forEach( ) method different?

The JavaScript forEach method is also used to loop through arrays, but it uses a function differently than the classic “for loop”.

forEach method, JavaScript passes a callback function for each element of an array with the following parameters

  • First is Current Value (it is required) – The value of the current array element
  • The Second is Index (it is optional) – The current element’s index number
  • Third is Array (it is optional) – The array object to which the current element belongs

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Firstly, to loop through an array by using the forEach method and you need a callback function:

numbers.forEach(function() {
// code
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Therefore, the function will be executed for every single element of the array. Also, it will be must take at least one parameter which represents the elements of an array

numbers.forEach(function(number) {

Here, we can use the ES6 array function that representation for simplifying the code

numbers.forEach(number => console.log(number));

forEach optional parameters

Index: Now, let’s continue with the optional parameters. Here, the first one is the “index” parameter, which represents the index number of each element.

However, we can see below the index number of an element if we include it as a second parameter:

numbers.forEach((number, index) => {
console.log('Index: ' + index + ' Value: ' + number);

Array: The second optional parameter is the array itself and it is also optional and can be used if needed in various operations.

Otherwise, if we call it then it will just get printed as many times as the number of elements of the array

numbers.forEach((number, index, array) => {

Finally, this array forEach method is supported in all browsers except IE version 8 or earlier.

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