Web/JavaScript/Reference/Global objects/TypedArray/find

The find() method returns a value of an element in the typed array, if it satisfies the provided testing function. Otherwise undefined is returned. TypedArray is one of the typed array types here.

See also the findIndex() method, which returns the index of a found element in the typed array instead of its value.

Syntax

typedarray.find(callback[, thisArg])

Parameters

callback: Function to execute on each value in the typed array, taking three 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 array find() was called upon.

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

Return value

A value in the array if an element passes the test; otherwise, undefined.

Description

The find() 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, find() immediately returns the value of that element. Otherwise, find() returns undefined. callback is invoked only for indexes of the typed array which have assigned values; it is not invoked for indexes which have been deleted or which have never been assigned values.

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

If a thisArg parameter is provided to find(), it will be used as the this for each invocation of the callback. If it is not provided, then undefined is used.

find() does not mutate the typed array on which it is called.

The range of elements processed by find() is set before the first invocation of callback. Elements that are appended to the typed array after the call to find() begins will not be visited by callback. If an existing, unvisited element of the typed array is changed by callback, its value passed to the visiting callback will be the value at the time that find() visits that element's index; elements that are deleted are not visited.

Examples

Find a prime number in a typed array

The following example finds an element in the typed array that is a prime number (or returns undefined if there is no prime number).

function isPrime(element, index, array) {
  var start = 2;
  while (start <= Math.sqrt(element)) {
    if (element % start++ < 1) {
      return false;
    }
  }
  return element > 1;
}

var uint8 = new Uint8Array([4, 5, 8, 12]);
console.log(uint8.find(isPrime)); // 5

Specifications

Specification
[(ECMA-262)The definition of '%TypedArray%.prototype.find' 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
`find`	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