uint8arrays/esm/src/concat.js

Utility functions to make dealing with Uint8Arrays easier

export function concat(arrays, length) {
  if (!length) {
    length = arrays.reduce((acc, curr) => acc + curr.length, 0);
  }
  const output = new Uint8Array(length);
  let offset = 0;
  for (const arr of arrays) {
    output.set(arr, offset);
    offset += arr.length;
  }
  return output;
}