ArrayBuffer.prototype.resizable

Baseline Newly available

This feature works across the latest devices and browser versions. This feature might not work in older devices or browser versions. It's been available across browsers since July 2024.

The resizable accessor property of ArrayBuffer instances returns whether this array buffer can be resized or not.

Try it

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

Specification
ECMAScript® 2027 Language Specification # sec-get-arraybuffer.prototype.resizable

Browser compatibility

	Desktop					Mobile							Server
	Chrome	Edge	Firefox	Opera	Safari	Chrome Android	Firefox for Android	Opera Android	Safari on iOS	Samsung Internet	WebView Android	WebView on iOS	Bun	Deno	Node.js
`resizable`	111	111	128	97	16.4	111	128	75	16.4	22.0	111	16.4	1.0.0	1.33	20.0.0