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型付き配列を連結する

Uint8Array の配列を引数として、それらを連結した単一の配列を返す関数 concat(arrays) を書いてください。

function concat(arrays) {
  // sum of individual array lengths
  let totalLength = arrays.reduce((acc, value) => acc + value.length, 0);

  if (!arrays.length) return null;

  let result = new Uint8Array(totalLength);

  // for each array - copy it over result
  // next array is copied right after the previous one
  let length = 0;
  for(let array of arrays) {
    result.set(array, length);
    length += array.length;
  }

  return result;
}

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