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  1. Tecnologia Web para desenvolvedores
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  3. Referência JavaScript
  4. Objetos Globais
  5. ArrayBuffer
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ArrayBuffer

Baseline Widely available *

This feature is well established and works across many devices and browser versions. It’s been available across browsers since julho de 2015.

* Some parts of this feature may have varying levels of support.

O objeto ArrayBuffer é um tipo de dado usado para representar um genérico, buffer de dados binários de tamanho fixo. Você não pode manipular diretamente os conteúdos de um ArrayBuffer; em vez disso, você cria um objeto ArrayBufferView que representa o buffer em um formato específico, e usa para ler e escrever os conteúdos do buffer.

In this article

Experimente

// Create an ArrayBuffer with a size in bytes const buffer = new ArrayBuffer(8); console.log(buffer.byteLength); // Expected output: 8

Syntax

new ArrayBuffer(length)

Parameters

length

The size, in bytes, of the array buffer to create.

Return value

A new ArrayBuffer object of the specified size. Its contents are initialized to 0.

Exceptions

A RangeError is thrown if the length is larger than Number.MAX_SAFE_INTEGER (>= 2 ** 53) or negative.

Description

The ArrayBuffer constructor creates a new ArrayBuffer of the given length in bytes.

Getting an array buffer from existing data

Properties

ArrayBuffer.length

The ArrayBuffer constructor's length property whose value is 1.

get ArrayBuffer[@@species]

The constructor function that is used to create derived objects.

ArrayBuffer.prototype

Allows the addition of properties to all ArrayBuffer objects.

Methods

ArrayBuffer.isView(arg)

Returns true if arg is one of the ArrayBuffer views, such as typed array objects or a DataView. Returns false otherwise.

ArrayBuffer.transfer(oldBuffer [, newByteLength])

Returns a new ArrayBuffer whose contents are taken from the oldBuffer's data and then is either truncated or zero-extended by newByteLength.

Instances

All ArrayBuffer instances inherit from ArrayBuffer.prototype.

Properties

Methods

ArrayBuffer.slice()

Has the same functionality as ArrayBuffer.prototype.slice().

Exemplo

In this example, we create a 8-byte buffer with a Int32Array view referring to the buffer:

var buffer = new ArrayBuffer(8); var view = new Int32Array(buffer);

Especificações

Specification
ECMAScript® 2027 Language Specification
# sec-arraybuffer-objects

Compatibilidade com navegadores

Enable JavaScript to view this browser compatibility table.

Compatibility notes

Starting with ECMAScript 2015, ArrayBuffer constructors require to be constructed with a new operator. Calling an ArrayBuffer constructor as a function without new, will throw a TypeError from now on.

js
var dv = ArrayBuffer(10); // TypedError: calling a builtin ArrayBuffer constructor // without new is forbidden
js
var dv = new ArrayBuffer(10);

Veja também

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This page was last modified on 17 de fev. de 2025 by MDN contributors.

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  1. Objetos Globais
  2. ArrayBuffer
  3. Construtor
    1. ArrayBuffer()
  4. Métodos estáticos
    1. isView()
  5. Propriedades estáticas
    1. [Symbol.species]
  6. Métodos de instância
    1. resize()
    2. slice()
    3. transfer()
    4. transferToFixedLength()
  7. Propriedades de instância
    1. byteLength
    2. detached
    3. maxByteLength
    4. resizable
  8. Herança
  9. Object/Function
  10. Métodos estáticos
    1. Function.prototype.apply()
    2. Function.prototype.bind()
    3. Function.prototype.call()
    4. Function.prototype.toString()
    5. [Symbol.hasInstance]()
  11. Propriedades estáticas
    1. Function.displayName
    2. Function.length
    3. Function.name
    4. prototype
    5. Function.arguments
    6. Function.caller
  12. Métodos de instância
    1. Object.prototype.__defineGetter__()
    2. Object.prototype.__defineSetter__()
    3. Object.prototype.__lookupGetter__()
    4. Object.prototype.__lookupSetter__()
    5. Object.prototype.hasOwnProperty()
    6. Object.prototype.isPrototypeOf()
    7. Object.prototype.propertyIsEnumerable()
    8. Object.prototype.toLocaleString()
    9. Object.prototype.toString()
    10. Object.prototype.valueOf()
  13. Propriedades de instância
    1. Object.prototype.__proto__
    2. Object.prototype.constructor

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