async-run

Async run with ES6 yield function like a charm

npm install async-run

Example:

//The Async function

function doAsync(value) {
  return new Promise((resolve, reject) => {
    setTimeout(() => {
      if (value > 5) return reject('Too big value')
      resolve(`result${value}`)
    }, 200)
  })
}

Let's call it multiple time

var run = require('async-run').run

run(function*() {
  var result1 = yield doAsync(1)
  // do stuff with result 1 here

  var result2 = yield doAsync(2)
  // do stuff with result 2 here

  var result3 = yield doAsync(3)
  // do stuff with result 3 here

  var result4 = yield doAsync(4)
  // do stuff with result 4 here

  return [result1, result2, result3, result4]
}).then(result => {
  console.log(result)
  // [result1, result2, result3, result4]
})

Sometime, when you want catch an error

run(function*() {
  var bigResult = yield doAsync(10)
}).catch(err => {
  console.log(err)
  // Too big value
})

Or just use try catch

run(function*() {
  try {
    var result = yield doAsync(1)
    // do stuff for result

    var failed = yield doAsync(10)
    // Exception was raised here

  } catch (err) {
    console.log(err)
    // Too big value
  }
})