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Create a pending promise ES6

I came across the source code of tiny-async-pool npm package, in there there's this composition

const p = Promise.resolve().then(() => iterator(index, array))

I am a bit confused by this implementation, so I started to do some checks, my understanding is that what it actually does is creating a pending promise, when I log in my terminal I get this:

;(async () => {
  const store = []

  const promiseFn1 = () => 'I say one'
  const promise1 = Promise.resolve().then(() => promiseFn1())
  console.log('promise1: ', promise1)
  store.push(promise1)

  const promiseFn2 = () => 'I say two'
  const promise2 = Promise.resolve(promiseFn2())
  console.log('promise2: ', promise2)
  store.push(promise2)

  const promiseFn3 = () => 'I say three'
  const promise3 = new Promise((resolve) => resolve(promiseFn3()))
  console.log('promise3: ', promise3)
  store.push(promise3)

  await Promise.all(store)
})()

Is this what the code is doing and if so, is this the only way to create a pending promise that can be stored on an array of promises?

Thanks.

about 4 years ago · Juan Pablo Isaza

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Create a pending promise ES6

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