files/en-us/web/javascript/reference/global_objects/arraybuffer/resizable/index.md

metadata

title: ArrayBuffer.prototype.resizable
short-title: resizable
slug: Web/JavaScript/Reference/Global_Objects/ArrayBuffer/resizable
page-type: javascript-instance-accessor-property
browser-compat: javascript.builtins.ArrayBuffer.resizable
sidebar: jsref

The resizable accessor property of {{jsxref("ArrayBuffer")}} instances returns whether this array buffer can be resized or not.

{{InteractiveExample("JavaScript Demo: ArrayBuffer.prototype.resizable")}}

const buffer1 = new ArrayBuffer(8, { maxByteLength: 16 });
const buffer2 = new ArrayBuffer(8);

console.log(buffer1.resizable);
// Expected output: true

console.log(buffer2.resizable);
// Expected output: false

Description

The resizable property is an accessor property whose set accessor function is undefined, meaning that you can only read this property. The value is established when the array is constructed. If the maxByteLength option was set in the constructor, resizable will return true; if not, it will return false.

Examples

Using resizable

In this example, we create a 8-byte buffer that is resizable to a max length of 16 bytes, then check its resizable property, resizing it if resizable returns true:

const buffer = new ArrayBuffer(8, { maxByteLength: 16 });

if (buffer.resizable) {
  console.log("Buffer is resizable!");
  buffer.resize(12);
}

Specifications

{{Specifications}}

Browser compatibility

{{Compat}}

See also

• {{jsxref("ArrayBuffer")}}
• {{jsxref("ArrayBuffer.prototype.maxByteLength")}}
• {{jsxref("ArrayBuffer.prototype.resize()")}}