ArrayBuffer.prototype.resizable

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

undefined

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:

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

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

Specifications

See also