Function loop

src/index.js:50–59

(i = 0)

  opts.batchSize = opts.batchSize || 1;

  const loop = (i = 0) => {
    for (let count = 0; i < arr.length && count < opts.batchSize; ++i, ++count) {
      iteratee(arr[i], i, arr);
    }
    if (i < arr.length) {
      timers.setImmediate(() => loop(i));
      return;
    }
    done();
  };
  loop();
};