Web/JavaScript/Reference/Global objects/TypedArray/some

The some() method tests whether some element in the typed array passes the test implemented by the provided function. This method has the same algorithm as Array.prototype.some(). TypedArray is one of the typed array types here.

The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.

Syntax

typedarray.some(callback[, thisArg])

Parameters

callback: Function to test for each element, taking three arguments:

currentValue 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 some was called upon.

thisArg: Optional. Value to use as this when executing callback.

Return value

true if the callback function returns a truthy value for any array element; otherwise, false.

Description

The some method executes the callback function once for each element present in the typed array until it finds one where callback returns a true value. If such an element is found, some immediately returns true. Otherwise, some returns false.

callback is invoked with three arguments: the value of the element, the index of the element, and the array object being traversed.

If a thisArg parameter is provided to some, it will be passed to callback when invoked, for use as its this value. Otherwise, the value undefined will be passed for use as its this value. The this value ultimately observable by callback is determined according to the usual rules for determining the this seen by a function.

some does not mutate the typed array on which it is called.

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.some
if (!Uint8Array.prototype.some) {
  Object.defineProperty(Uint8Array.prototype, 'some', {
    value: Array.prototype.some
  });
}

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.

Examples

Testing size of all typed array elements

The following example tests whether any element in the typed array is bigger than 10.

function isBiggerThan10(element, index, array) {
  return element > 10;
}
new Uint8Array([2, 5, 8, 1, 4]).some(isBiggerThan10); // false
new Uint8Array([12, 5, 8, 1, 4]).some(isBiggerThan10); // true

Testing typed array elements using arrow functions

Arrow functions provide a shorter syntax for the same test.

new Uint8Array([2, 5, 8, 1, 4]).some(elem => elem > 10); // false
new Uint8Array([12, 5, 8, 1, 4]).some(elem => elem > 10); // true

Specifications

Specification

[(ECMA-262)The definition of 'TypedArray.prototype.some' 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
`some`	Chrome Full support 45	Edge Full support 14	Firefox Full support 37	IE No support No	Opera Full support 32	Safari Full support 10	WebView Android Full support 45	Chrome Android Full support 45	Firefox Android Full support 37	Opera Android No support No	Safari iOS Full support 10	Samsung Internet Android Full support 5.0	nodejs Full support 4.0.0

Legend

Full support: Full support
No support: No support