TypedArray.prototype.forEach()

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

{{InteractiveExample("JavaScript Demo: TypedArray.prototype.forEach()")}}

```js interactive-example const uint8 = new Uint8Array([10, 20, 30]);

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

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

## Syntax

```js-nolint
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_inline}}
• : A value to use as this when executing callbackFn. See iterative methods.

Return value#

None ({{jsxref("undefined")}}).

Description#

See {{jsxref("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#

{{Specifications}}

Browser compatibility#

{{Compat}}

See also#

• Polyfill of TypedArray.prototype.forEach in core-js
• JavaScript typed arrays guide
• {{jsxref("TypedArray")}}
• {{jsxref("TypedArray.prototype.find()")}}
• {{jsxref("TypedArray.prototype.map()")}}
• {{jsxref("TypedArray.prototype.filter()")}}
• {{jsxref("TypedArray.prototype.every()")}}
• {{jsxref("TypedArray.prototype.some()")}}
• {{jsxref("Array.prototype.forEach()")}}
• {{jsxref("Map.prototype.forEach()")}}
• {{jsxref("Set.prototype.forEach()")}}