ArrayBuffer

new ArrayBuffer(length)

length

byte

ArrayBuffer 0

Exceptions

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

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

ArrayBuffer

• From a Base64 string

ArrayBuffer.length

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

ArrayBuffer[Symbol.species]

The constructor function that is used to create derived objects.

ArrayBuffer

Allows the addition of properties to all ArrayBuffer objects.

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.

ArrayBuffer

ArrayBuffer ArrayBuffer.

ArrayBuffer.prototype[Symbol.toStringTag]

The initial value of the Symbol.toStringTag property is the string "ArrayBuffer". This property is used in Object.prototype.toString().

ArrayBuffer.prototype.byteLength

The read-only size, in bytes, of the ArrayBuffer. This is established when the array is constructed and cannot be changed.

ArrayBuffer.prototype.slice()

Returns a new ArrayBuffer whose contents are a copy of this ArrayBuffer's bytes from begin (inclusive) up to end (exclusive). If either begin or end is negative, it refers to an index from the end of the array, as opposed to from the beginning.

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);

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.

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

var dv = new ArrayBuffer(10);

• TypedArray
• SharedArrayBuffer