How to fire multiple async calls in koa using generators+promises

I'm new to generators and having a hard time finding an example of how to fire off multiple async calls with generators + native promises

so far I have in a sudo code format

function *getData (){
var data = yeild makeAPICall ();
}

function makeAPICall (){
  async code
  return async code
}

How would I structure my code if I wanted to make multiple calls to makeAPICall in parallel using native javascript promises.