JavaScript ArrayBuffer() Constructor (original) (raw)

Last Updated : 18 May, 2023

JavaScript ArrayBuffer Constructor is used to create a new ArrayBuffer object**. ArrayBuffer** object is used to represent a generic, fixed-length raw binary data buffer. This object can only be created with the new keyword. If the object is created without the new keyword it will throw a TypeError

Syntax:

new ArrayBuffer(byteLength, opt)

Parameters: It accepts two parameters where the second parameter is optional.

Return value: It returns a new ArrayBuffer object of the specified size and the content is initialized to 0.

Example 1: This example creates ArrayBufferobject with different parameters.

JavaScript `

const arr1 = new ArrayBuffer(8, {maxByteLength: 24}); const arr2 = new ArrayBuffer(8);

console.log(arr1); console.log(arr2);

console.log(arr1.maxByteLength); console.log(arr2.maxByteLength);

`

Output: The ArrayBuffer which was created without specifying the max byte length has a default max byte length equal to its byte length specified during the creation of the object

ArrayBuffer(8) ArrayBuffer(8) 24 8

Example 2: In this example, we will see the use of the Javascript ArrayBuffer() method.

javascript `

//Create a 16byte buffer let buffer = new ArrayBuffer(16);

//Create a DataView referring to the buffer let view1 = new DataView(buffer);

//Create a Int8Array view referring to the buffer let view2 = new Int8Array(buffer);

//Put value of 32bits view1.setInt32(0, 0x76543210);

//prints the 32bit value console.log(view1.getInt32(0).toString(16));

//prints only 8bit value console.log(view1.getInt8(0).toString(16)); console.log(view2[0].toString(16));

`

Output:

76543210 76 76

Supported Browsers:

We have a complete list of ArrayBuffer methods and properties, to check Please go through the JavaScript ArrayBuffer Reference article.