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DOMTokenList: forEach() method

The forEach() method of the DOMTokenList interface calls the callback given in parameter once for each value pair in the list, in insertion order.

Syntax

forEach(callback)
forEach(callback, thisArg)

Parameters

callback

The function to execute for each element, eventually taking three arguments:

currentValue: The current element being processed in the array.
currentIndex: The index of the current element being processed in the array.
listObj: The array that forEach() is being applied to.

thisArg Optional

The value to use as this when executing callback.

Return value

None.

Example

In the following example we retrieve the list of classes set on a <pre> element as a DOMTokenList using Element.classList. We when retrieve an iterator containing the values using forEach(), writing each one to the <pre>'s Node.textContent inside the forEach() inner function.

HTML

html

<pre class="a b c"></pre>

JavaScript

const pre = document.querySelector("pre");
const classes = pre.classList;
const iterator = classes.values();

classes.forEach(function (value, key, listObj) {
  pre.textContent += `(${value}${key})/${this}\n`;
}, "arg");

Result

Specifications

No specification found

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Browser compatibility

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	WebView Android	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet
`forEach`	42	16	50	No	29	10.1	42	42	50	29	10.3	4.0