The Uint16Array()
typed array constructor creates an array of 16-bit unsigned integers in the platform byte order.
Uint16Array() constructor
Syntax
new Uint16Array(); // new in ES2017 new Uint16Array(length); new Uint16Array(typedArray); new Uint16Array(object); new Uint16Array(buffer); new Uint16Array(buffer, byteOffset); new Uint16Array(buffer, byteOffset, length);
Parameters
-
length
-
When called with a
length
argument, an internal array buffer is created in memory, of sizelength
multiplied byBYTES_PER_ELEMENT
bytes, containing zeros. -
typedArray
-
When called with a
typedArray
argument, which can be an object of any of the non-bigint typed-array types (such asInt32Array
), thetypedArray
gets copied into a new typed array. Each value intypedArray
is converted to the corresponding type of the constructor before being copied into the new array. The length of the new typed array will be same as the length of thetypedArray
argument. -
object
-
When called with an
object
argument, a new typed array is created as if by theTypedArray.from()
method. -
buffer
,byteOffset
,length
-
When called with a
buffer
, and optionally abyteOffset
and alength
argument, a new typed array view is created that views the specifiedArrayBuffer
. ThebyteOffset
andlength
parameters specify the memory range that will be exposed by the typed array view. If both are omitted, all ofbuffer
is viewed; if onlylength
is omitted, the remainder ofbuffer
is viewed.
Description
The Uint16Array()
typed array constructor creates an array of 16-bit unsigned integers in the platform byte order. If control over byte order is needed, use DataView
instead. The contents are initialized to 0
. Once established, you can reference elements in the array using the object's methods, or using standard array index syntax (that is, using bracket notation).
Starting with ECMAScript 2015, Uint16Array
constructors require to be constructed with a new
operator. Calling a Uint16Array
constructor as a function without new
, will throw a TypeError
from now on.
var dv = Uint16Array([1, 2, 3]); // TypeError: calling a builtin Uint16Array constructor // without new is forbidden
var dv = new Uint16Array([1, 2, 3]);
Examples
Different ways to create a Uint16Array
// From a length var uint16 = new Uint16Array(2); uint16[0] = 42; console.log(uint16[0]); // 42 console.log(uint16.length); // 2 console.log(uint16.BYTES_PER_ELEMENT); // 2 // From an array var arr = new Uint16Array([21,31]); console.log(arr[1]); // 31 // From another TypedArray var x = new Uint16Array([21, 31]); var y = new Uint16Array(x); console.log(y[0]); // 21 // From an ArrayBuffer var buffer = new ArrayBuffer(8); var z = new Uint16Array(buffer, 0, 4); // From an iterable var iterable = function*(){ yield* [1,2,3]; }(); var uint16 = new Uint16Array(iterable); // Uint16Array[1, 2, 3]
Specifications
Browser compatibility
Desktop | Mobile | Server | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | Deno | Node.js | |
Uint16Array |
7
|
12
|
4
|
10
|
11.6
|
5.1
|
4
|
18
|
4
|
12
|
4.2
|
1.0
|
1.0
|
0.10.0
|
constructor_without_parameters |
7
|
12
|
55
|
10
|
11.6
|
5.1
|
≤37
|
18
|
55
|
12
|
5
|
1.0
|
1.0
|
0.10.0
|
iterable_allowed |
39
|
14
|
52
|
No
|
26
|
10
|
39
|
39
|
52
|
26
|
10
|
4.0
|
1.0
|
4.0.0
|
new_required |
7
|
14
|
44
|
No
|
15
|
5.1
|
≤37
|
18
|
44
|
14
|
5
|
1.0
|
1.0
|
0.12.0
|
See also
© 2005–2022 MDN contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Uint16Array/Uint16Array