promise-utils

promise-utils.js

// version 1: using promise with utility functions
const passthrough = fn => data => Promise.all([data, fn(data)])
const spread = fn => list => fn(...list)

const makeRequest = () => promise1()
  .then(passthrough(promise2))
  .then(spread(promise3))
  

// version 2: async/await
const makeRequest = async () => {
  const value1 = await promise1()
  const value2 = await promise2(value1)
  return promise3(value1, value2)
}