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CSSStyleDeclaration JS Conversion


JavaScript Typed Array Reference

Example

const myArr = new Int8Array(10);
Try it Yourself »

JavaScript Typed Arrays

In Javascript, a typed array is an array-like buffer of binary data.

There is no JavaScript property or object named TypedArray, but properties and methods can be used with typed array objects:


Typed Array Objects

Object Data Type Range
Int8Array Signed integer (byte) -128/127
Uint8Array Unsigned integer (octet) 0/255
Uint8ClampedArray Unsigned integer (octet) 0/255
Int16Array Short integer -32768/32767
Uint16Array Unsigned short integer 0/65535
Int32Array Signed long integer -231/231-1
Uint32Array Unsigned long integer 0/232
Float32Array Float - 7 significant digits 1.2x10-38/3.4x1038
Float64Array Double - 16 significant digits 5.0x10-324/1.8x10308
BigInt64Array Big signed integer -263/263-1
BigUint64Array Big unsigned integer 0/264

Note

Typed arrays are not arrays.

isArray() on a typed array returns false.

Many array methods (like push and pop) are not supported by typed arrays.

Typed arrays are array-like objects for storing binary data in memory.



Typed Array Methods and Properties

Method / Property Description
BYTES_PER_ELEMENT Property to count the number of bytes used to store one element
fill() Fill all elements with a value
find() Returns the first element that satisfies a condition
name Returns the name of the typed array
of() Method to create a typed array from an array
some() Reurns true if one element satisfies a condition

Uint8Array vs Uint8ClampedArray

The difference between an Uint8Array and an Uint8ClampedArray is how values are added.

If you set one element in an Uint8ClampedArray to a value outside the 0-255 range, it will default to 0 or 255.

A typed array will just take the first 8 bits of the value.


Typed Array Benefits

Typed arrays provide a way to handle binary data as efficiently as arrays work in C.

Typed arrays are raw memory, so JavaScript can pass them directly to any function without converting the data to another representation.

Typed arrays are serously faster than normal arrays, for passing data to functions that can use raw binary data (Computer Games, WebGL, Canvas, File APIs, Media APIs).


Browser APIs Supporting Typed Arrays

Fetch API Example

fetch(url)
.then(request => request.arrayBuffer())
.then(arrayBuffer =>...);

Canvas Example

const canvas = document.getElementById('my_canvas');
const context = canvas.getContext('2d');
const imageData = context.getImageData(0, 0, canvas.width, canvas.height);
const uint8ClampedArray = imageData.data;

Browser Support

typedArray is an ECMAScript6 (ES6) feature.

ES6 (JavaScript 2015) is supported in all modern browsers:

Chrome Edge Firefox Safari Opera
Yes Yes Yes Yes Yes

typedArray is not supported in Internet Explorer 11 (or earlier).