NOTE: This is my experiment, you can use Rx or something better than mine one XD

At the time, I need an array method act like array.forEach methods I thinking about to create the first function in this gist.

Here I describe example ways to use these functions in code. (I'm so boring to write a story :3)

Exmaple 1: When you to update a list item one by one asynchronously. you may use asyncForEach

async function magicSpell() {
  const birdIds = [1,2,3,4,5,6,7,8,9,10]; // list of items
  
  try {
    await asyncForEach(birdsIds, async (birdId) => {
      await axios.post(`https://shootbirds.com/onebyone/${birdId}`, { hit: true });
    });
    
    console.log('Awesome! let make dinner.');
  } catch (err) {
    console.log('Whoop! All other escape!');
  }
}

Example 2: When you need list of item asynchronously.

async function magicSpell() {
  const cities = 'Yangon Mandalay Pathein'.split(' ');

  const weatherData = await asyncMap(cities, async (cityName) => {
    const { data: weatherStats } = await axios.get(`https://samples.openweathermap.org/data/2.5/weather?q=${cityName}`);
    return weatherStats;
  })
  
  console.log(weatherData) // [weatherStats, weatherStats, weatherStats]
}

Example 3: Or you may want to reduce for combine function

// mock async data retrever
function getPrice(vocherId) {
  const amounts = {
    123: 10000,
    124: 20000,
    125: 30000,
    126: 40000,
  }
  return new Promise((resolve, reject) => {
    return amounts[voucherId] || 0;
  })
}


async function magicSpell() {
  const vouchers = '123 124 125 126'.split(' ');

  const totalPrice = await asyncReduce(vouchers, async (total, voucherId) => {
    return total + await getPrice(voucherId)
  }, 0);
  
  console.log(totalPrice) // 1,000,000
}