JavaScript Array.forEach() Method Example

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The forEach() method executes a provided function once for each array element.

Syntax

arr.forEach(function callback(currentValue [, index [, array]]) { //your iterator }[, thisArg]);

1. callback - Function to execute on each element, taking three arguments:

• currentValue - The current element being processed in the array.
• index (Optional) - The index of the current element being processed in the array.
• array (Optional) - The array forEach() was called upon.

2. thisArg (Optional) - Value to use as this when executing the callback.

Examples

Example 1: Simple Array.forEach() Example

 var progLangs = ['Java', 'C', 'C++', 'PHP', 'Python']; progLangs.forEach(element => { console.log(element); });

Output:

Java C C++ PHP Python

Example 2: Converting a for loop to forEach

const items = ['item1', 'item2', 'item3']; const copy = []; // before for (let i=0; i<items.length; i++) { copy.push(items[i]); } // after items.forEach(function(item){ copy.push(item); });