30-seconds-of-code/snippets/chainAsync.md

chainAsync

Chains asynchronous functions.

Loop through an array of functions containing asynchronous events, calling next when each asynchronous event has completed.

The tenerary function checks the next function exists before calling it, otherwise it will exit.

const chainAsync = fns => {
  let curr = 0;
  const next = () => fns[++curr] ? fns[curr](next) : false;
  next();
};

chainAsync([
  next => {
    console.log('0 seconds');
    setTimeout(next, 1000);
  },
  next => {
    console.log('1 second');
  }
]);