Run array stacks in series (create stacks from an array and run them in series) - Async function is supported

stacks-series.js

const { forEachSeries } = require('p-iteration');

// Async function
function asyncFn(item, time = 1000) {
  return new Promise((resolve) => {
    setTimeout(() => {
      console.log(item);
      resolve(item);
    }, time);
  });
}

// Stack creator
function getStacks(list = [], size = 2) {
  const stacks = [];
  const { length } = list;

  if (length < size) {
    return [list];
  }

  for (let i = 0; i < length; i += size) {
    const slice = list.slice(i, i + size);
    stacks.push(slice);
  }

  return stacks;
}

// Demo
(async () => {
  console.log('Start');

  /*
   * Create 5 stacks from the array and run them in series
   */
  const collection = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
  const stackSize = 2;
  const listStacks = getStacks(collection, stackSize);

  await forEachSeries(listStacks, async (stack, i) => {
    const process = stack.map((item) => (asyncFn(item, 2000)));
    console.log(`Running stack ${i}`);
    await Promise.all(process);
    console.log('OK!');
  });

  console.log('End');
})();