newLength

The new length, in bytes, to resize the SharedArrayBuffer to.

None (undefined).

TypeError

Thrown if the SharedArrayBuffer is not growable.

RangeError

Thrown if newLength is larger than the maxByteLength of the SharedArrayBuffer or smaller than the byteLength.

The grow() method grows a SharedArrayBuffer to the size specified by the newLength parameter, provided that the SharedArrayBuffer is growable and the new size is less than or equal to the maxByteLength of the SharedArrayBuffer. New bytes are initialized to 0.

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

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

if (buffer.growable) {
  console.log("SAB is growable!");
  buffer.grow(12);
}

• SharedArrayBuffer
• SharedArrayBuffer.prototype.growable
• SharedArrayBuffer.prototype.maxByteLength