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JavaScript Array forEach() Method

Last Updated : 1 Jun, 2026

The JavaScript Array forEach() method is a built-in function that executes a provided function once for each array element. It does not return a new array and does not modify the original array. It's commonly used for iteration and performing actions on each array element.

Syntax

array.forEach(callback(element, index, arr), thisArg);

Parameters

This method accepts five parameters as mentioned above and described below:

ParameterDescription
callbackIt is a callback function executes for each array element.
elementThe current element being processed in the array.
index (Optional)The index of current element. The array indexing starts from 0.
array (Optional)The array on which forEach() is called.
thisArg (Optional)Value to use as this when executing the callback function.

Return value

This method may or may not change the original array provided as it depends upon the functionality of the argument function.

Example 1: Basic iteration to print array elements on console.

Example 2: Copy elements from one array to another using forEach().

Example 3: Calculates the square of every element of the array using forEach() method.

Limitations of forEach() Method

  • No Break or Continue: Unlike for loops, you cannot break the forEach() loop or use continue to skip to the next iteration. It will always iterate over all elements.
  • No Return Value: The forEach() loop does not return a new array, it returns undefined.
  • Asynchronous Issues: The forEach() loop does not handle asynchronous operations well. If you need to perform asynchronous operations, consider using for...of with async/await or Promise.all.
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