Web/JavaScript/Reference/Global objects/TypedArray/join

The join() method joins all elements of an array into a string. This method has the same algorithm as Array.prototype.join(). TypedArray is one of the typed array types here.

Syntax

typedarray.join([separator = ',']);

Parameters

separator Optional: Specifies a string to separate each element. The separator is converted to a string if necessary. If omitted, the typed array elements are separated with a comma (",").

Return value

A string with all array elements joined.

Examples

Using join()

var uint8 = new Uint8Array([1,2,3]);
uint8.join();      // '1,2,3'
uint8.join(' / '); // '1 / 2 / 3'
uint8.join('');    // '123'

Polyfill

Since there is no global object with the name TypedArray, polyfilling must be done on an "as needed" basis.

// https://tc39.github.io/ecma262/#sec-%typedarray%.prototype.join
if (!Uint8Array.prototype.join) {
  Object.defineProperty(Uint8Array.prototype, 'join', {
    value: Array.prototype.join
  });
}

If you need to support truly obsolete JavaScript engines that don't support Object.defineProperty, it's best not to polyfill Array.prototype methods at all, as you can't make them non-enumerable.

Specifications

Specification
[(ECMA-262)The definition of 'TypedArray.prototype.join' in that specification.]

Browser compatibility

Update compatibility data on GitHub

	Desktop						Mobile						Server
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet	Node.js
`join`	Chrome Full support 45	Edge Full support 14	Firefox Full support 37	IE No support No	Opera Full support 32	Safari Full support 9.1	WebView Android Full support 45	Chrome Android Full support 45	Firefox Android Full support 37	Opera Android Full support 32	Safari iOS Full support 9.3	Samsung Internet Android Full support 5.0	nodejs Full support 4.0.0

Legend

Full support: Full support
No support: No support