Promise.resolve vs resolve

Question

I have this code:

var promise1 = new Promise(function(resolve, reject) {
  setTimeout(() => {
         console.warn(\'Elo\');
         resolve(\'First response         


        

Answer 1

Another way to think about it is:

Resolve === resolveCallback === first argument provided to your Promise callback Promise.resolve === a function to returns a new Promise

These two are functional equivalents:

`const foo = Promise.resolve('First response').then( /* ... */ );`

`const bar = new Promise(function(resolveCallback, rejectCallback) {
    resolveCallback('First response');
  }).then( /* ... */ );`

Answer 2

The new Promise constructor passes a specific function into your callback, which becomes your resolve parameter. That promise (the one you're constructing there with new Promise) can only be resolved by calling that specific resolve function.

Promise.resolve simply creates a new "pre-resolved" promise. It does not resolve any existing promise (nor would it have any way of knowing which promise it's supposed to resolve).