目录

JavaScript Array forEach()

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Example 1

Calls a function for each element in fruits:

const fruits = ["apple", "orange", "cherry"];
fruits.forEach(myFunction);

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Description

The forEach() method calls a function for each element in an array.

The forEach() method is not executed for empty elements.

See Also:

The Array map() Method

The Array filter() Method

Syntax

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

Parameters

function()	Required. A function to run for each array element.
currentValue	Required. The value of the current element.
index	Optional. The index of the current element.
arr	Optional. The array of the current element.
thisValue	Optional. Default `undefined`. A value passed to the function as its `this` value.

Return Value

undefined

More Examples

Compute the sum:

let sum = 0;
const numbers = [65, 44, 12, 4];
numbers.forEach(myFunction);

function myFunction(item) {
sum += item;
}

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Multiply each element:

const numbers = [65, 44, 12, 4];
numbers.forEach(myFunction)

function myFunction(item, index, arr) {
arr[index] = item * 10;
}

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Related Pages:

Array Iterations

Browser Support

forEach() is an ECMAScript5 (ES5) feature.

ES5 (JavaScript 2009) fully supported in all browsers:


Chrome	Edge	Firefox	Safari	Opera	IE
Yes	Yes	Yes	Yes	Yes	9-11

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