slice-source/concat.js

A readable stream reader that reads a desired number of bytes.

export default function concat(a, b) {
  if (!a.length) return b;
  if (!b.length) return a;
  var c = new Uint8Array(a.length + b.length);
  c.set(a);
  c.set(b, a.length);
  return c;
}