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.

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);
}

• ArrayBuffer
• ArrayBuffer.prototype.maxByteLength
• ArrayBuffer.prototype.resize()