[ASYNC examples] #javascript

snippet.js

//do one thing after another is finished
const doThing = async function(timeout) {
	const resp = await fetch(scheduleEndpoint, {method: 'POST', body: params}); //needs to return a promise?
  	return resp;
}
await doThing();          //do an api call or something async that returns a promise
console.log('all done');  //don't do anything else until that is finished.

//do a bunch of things in series, then do something else
//https://zellwk.com/blog/async-await-in-loops/
const fruitsToGet = ['apple', 'grape', 'pear'];

const forLoop = async _ => {
  console.log('Start')

  for (let index = 0; index < fruitsToGet.length; index++) {
    const fruit = fruitsToGet[index];
    const numFruit = await getNumFruit(fruit);
    console.log(numFruit);
  }

  console.log('End');
}


//do a bunch of things in parallel, then do something else
const mapLoop = async _ => {
  console.log('Start')

  const promises = fruitsToGet.map(async fruit => {
    const numFruit = await getNumFruit(fruit)
    return numFruit
  })
  
  const numFruits = await Promise.all(promises)
  console.log(numFruits)

  console.log('End')
}