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Uint16Array

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A typed array (array escrita à máquina) Uint16Array representa uma sequência de números inteiros não negativos de 16-bits utilizando a ordem de bytes (endianness) da plataforma. Se for necessário o controle sobre a ordem de bytes de cada número, use DataView em vez. Cada número inicia por 0. Síntaxe:

new Uint16Array(tamanhoDeElementos);
new Uint16Array(arrayComElementos);
new Uint16Array(objetoDescritivo);
new Uint16Array(buffer [, posiçãoDoPrimeiroByte [, tamanhoDeElementos]]);

Para mais informação sobre a síntaxe do construtor e seus parâmetros, veja TypedArray.

Properties

Uint16Array.BYTES_PER_ELEMENT
Returns a number value of the element size. 2 in the case of an Uint16Array.
Uint16Array.length
Static length property whose value is 0. For the actual length (number of elements), see Uint16Array.prototype.length.
Uint16Array.name
Returns the string value of the constructor name. In the case of the Uint16Array type: "Uint16Array".
Uint16Array.prototype
Prototype for the TypedArray objects.

Methods

Uint16Array.from()
Creates a new Uint16Array from an array-like or iterable object. See also Array.from().
Uint16Array.of()
Creates a new Uint16Array with a variable number of arguments. See also Array.of().

Uint16Array prototype

All Uint16Array objects inherit from %TypedArray%.prototype.

Properties

Uint16Array.prototype.constructor
Returns the function that created an instance's prototype. This is the Uint16Array constructor by default.
Uint16Array.prototype.buffer Somente leitura
Returns the ArrayBuffer referenced by the Uint16Array Fixed at construction time and thus read only.
Uint16Array.prototype.byteLength Somente leitura
Returns the length (in bytes) of the Uint16Array from the start of its ArrayBuffer. Fixed at construction time and thus read only.
Uint16Array.prototype.byteOffset Somente leitura
Returns the offset (in bytes) of the Uint16Array from the start of its ArrayBuffer. Fixed at construction time and thus read only.
Uint16Array.prototype.length Somente leitura
Returns the number of elements hold in the Uint16Array. Fixed at construction time and thus read only.

Methods

Uint16Array.prototype.copyWithin()
Copies a sequence of array elements within the array. See also Array.prototype.copyWithin().
Uint16Array.prototype.entries()
Returns a new Array Iterator object that contains the key/value pairs for each index in the array. See also Array.prototype.entries().
Uint16Array.prototype.every()
Tests whether all elements in the array pass the test provided by a function. See also Array.prototype.every().
Uint16Array.prototype.fill()
Fills all the elements of an array from a start index to an end index with a static value. See also Array.prototype.fill().
Uint16Array.prototype.filter()
Creates a new array with all of the elements of this array for which the provided filtering function returns true. See also Array.prototype.filter().
Uint16Array.prototype.find()
Returns the found value in the array, if an element in the array satisfies the provided testing function or undefined if not found. See also Array.prototype.find().
Uint16Array.prototype.findIndex()
Returns the found index in the array, if an element in the array satisfies the provided testing function or -1 if not found. See also Array.prototype.findIndex().
Uint16Array.prototype.forEach()
Calls a function for each element in the array. See also Array.prototype.forEach().
Uint16Array.prototype.includes()
Determines whether a typed array includes a certain element, returning true or false as appropriate. See also Array.prototype.includes().
Uint16Array.prototype.indexOf()
Returns the first (least) index of an element within the array equal to the specified value, or -1 if none is found. See also Array.prototype.indexOf().
Uint16Array.prototype.join()
Joins all elements of an array into a string. See also Array.prototype.join().
Uint16Array.prototype.keys()
Returns a new Array Iterator that contains the keys for each index in the array. See also Array.prototype.keys().
Uint16Array.prototype.lastIndexOf()
Returns the last (greatest) index of an element within the array equal to the specified value, or -1 if none is found. See also Array.prototype.lastIndexOf().
Uint16Array.prototype.map()
Creates a new array with the results of calling a provided function on every element in this array. See also Array.prototype.map().
Uint16Array.prototype.move() Unimplemented
Former non-standard version of Uint16Array.prototype.copyWithin().
Uint16Array.prototype.reduce()
Apply a function against an accumulator and each value of the array (from left-to-right) as to reduce it to a single value. See also Array.prototype.reduce().
Uint16Array.prototype.reduceRight()
Apply a function against an accumulator and each value of the array (from right-to-left) as to reduce it to a single value. See also Array.prototype.reduceRight().
Uint16Array.prototype.reverse()
Reverses the order of the elements of an array — the first becomes the last, and the last becomes the first. See also Array.prototype.reverse().
Uint16Array.prototype.set()
Stores multiple values in the typed array, reading input values from a specified array.
Uint16Array.prototype.slice()
Extracts a section of an array and returns a new array. See also Array.prototype.slice().
Uint16Array.prototype.some()
Returns true if at least one element in this array satisfies the provided testing function. See also Array.prototype.some().
Uint16Array.prototype.sort()
Sorts the elements of an array in place and returns the array. See also Array.prototype.sort().
Uint16Array.prototype.subarray()
Returns a new Uint16Array from the given start and end element index.
Uint16Array.prototype.values()
Returns a new Array Iterator object that contains the values for each index in the array. See also Array.prototype.values().
Uint16Array.prototype.toLocaleString()
Returns a localized string representing the array and its elements. See also Array.prototype.toLocaleString().
Uint16Array.prototype.toString()
Returns a string representing the array and its elements. See also Array.prototype.toString().
Uint16Array.prototype[@@iterator]()
Returns a new Array Iterator object that contains the values for each index in the array.

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

Specification Status Comment
Typed Array Specification Obsolete Superseded by ECMAScript 2015.
ECMAScript 2015 (6th Edition, ECMA-262)
The definition of 'TypedArray constructors' in that specification.
Standard Initial definition in an ECMA standard. Specified that new is required.
ECMAScript 2017 Draft (ECMA-262)
The definition of 'TypedArray constructors' in that specification.
Draft  

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support 7.0 4.0 (2) 10 11.6 5.1
new is required ? 44 (44) ? ? ?
Iterable in constructor ? 52 (52) ? ? ?
Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support 4.0 (Yes) 4.0 (2) 10 11.6 4.2
new is required ? ? 44.0 (44) ? ? ?
Iterable in constructor ? ? 52.0 (52) ? ? ?

Compatibility notes

Starting with ECMAScript 2015 (ES6), 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]);

See also

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