Functional JavaScript — Generators

Generators and async.

Callback Hell

If we some functions like:

let sync = () => {
  //..
}
let sync2 = () => {
  //...
}
let sync3 = () => {
  //...
}

and each function is synchronous, then we can call it one by one and compose them our way.

But if they’re async, then we can’t call one by one.

An async function may have a callback to let us call the callback when we get the result:

let async1 = (fn) => {
  //...
  fn( /* result data */ )
}
let async2 = (fn) => {
  //...
  fn( /* result data */ )
}
let async3 = (fn) => {
  //...
  fn( /* result data */ )
}

Then if we want to call them sequentially, we’ve to write something like:

async1(function(x) {
  async2(function(y) {
    async3(function(z) {
      //...
    });
  });
});

As we can see, there’s a lot of nesting in our code.

We got to make this cleaner.

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