Function at

deno/corejs/index.js:10268–10270

(shift)

    var triplet;

    var at = function (shift) {
      return charAt(alphabet, (triplet >> (6 * shift)) & 63);
    };

    for (; i + 2 < length; i += 3) {
      triplet = (array[i] << 16) + (array[i + 1] << 8) + array[i + 2];