TypedArray.prototype.forEach()

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since September 2016.

The forEach() method of TypedArray instances executes a provided function once for each typed array element. This method has the same algorithm as Array.prototype.forEach().

Try it

const uint8 = new Uint8Array([10, 20, 30]);

uint8.forEach((element) => console.log(element));

// Expected output: 10
// Expected output: 20
// Expected output: 30

Syntax

forEach(callbackFn)
forEach(callbackFn, thisArg)

Parameters

callbackFn

A function to execute for each element in the typed array. Its return value is discarded. The function is called with the following arguments:

element: The current element being processed in the typed array.
index: The index of the current element being processed in the typed array.
array: The typed array forEach() was called upon.

thisArg Optional

A value to use as this when executing callbackFn. See iterative methods.

Return value

None (undefined).

Description

See Array.prototype.forEach() for more details. This method is not generic and can only be called on typed array instances.

Examples

Logging the contents of a typed array

The following code logs a line for each element in a typed array:

function logArrayElements(element, index, array) {
  console.log(`a[${index}] = ${element}`);
}

new Uint8Array([0, 1, 2, 3]).forEach(logArrayElements);
// Logs:
// a[0] = 0
// a[1] = 1
// a[2] = 2
// a[3] = 3

Specifications

Specification
ECMAScript® 2026 Language Specification # sec-%typedarray%.prototype.foreach