How to structure nested Promises

Question

I have a situation where I think the only choice for me is to nest some Promises within each other. I have a Promise that needs to be performed and a method that does someth

Answer 1

Use .then()

let doStuff = (resolve, reject) => {/* resolve() or reject() */};
let promise = new Promise(doStuff);
doSomethingUntilPromiseisDone(
  promise 
  .then(value => fetchValue(url))
  .then(value => value.blob())
  .then(saveToCache)
)
.then(success => console.log("success!!"))
.catch(err => console.error(err))