How to go from Blob to ArrayBuffer

Question

I was studying Blobs, and I noticed that when you have an ArrayBuffer, you can easily convert this to a Blob as follows:

var dataView = new DataView(arrayBuf         


        

Answer 1

There is now (Chrome 76+ & FF 69+) a Blob.prototype.arrayBuffer() method which will return a Promise resolving with an ArrayBuffer representing the Blob's data.

(async () => {
  const blob = new Blob(['hello']);
  const buf = await blob.arrayBuffer();
  console.log( buf.byteLength ); // 5
})();