Last Updated : 11 Jul, 2025
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.
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