TypedArray.prototype.includes()
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since September 2016.
Theincludes() method ofTypedArray instances determines whether a typed array includes a certain value among its entries, returningtrue orfalse as appropriate. This method has the same algorithm asArray.prototype.includes().
Try it
const uint8 = new Uint8Array([10, 20, 30, 40, 50]);console.log(uint8.includes(20));// Expected output: true// Check from position 3console.log(uint8.includes(20, 3));// Expected output: falseSyntax
includes(searchElement)includes(searchElement, fromIndex)Parameters
searchElementThe value to search for.
fromIndexOptionalZero-based index at which to start searching,converted to an integer.
Return value
A boolean value which istrue if the valuesearchElement is found within the typed array (or the part of the typed array indicated by the indexfromIndex, if specified).
Description
SeeArray.prototype.includes() for more details. This method is not generic and can only be called on typed array instances.
Examples
Using includes()
const uint8 = new Uint8Array([1, 2, 3]);uint8.includes(2); // trueuint8.includes(4); // falseuint8.includes(3, 3); // false// NaN handling (only relevant for floating point arrays)new Uint8Array([NaN]).includes(NaN); // false, since the NaN passed to the constructor gets converted to 0new Float32Array([NaN]).includes(NaN); // trueSpecifications
| Specification |
|---|
| ECMAScript® 2026 Language Specification # sec-%typedarray%.prototype.includes |