There's more

As you may have guessed, the results of the constituent promises don't have to return the same value. This can be useful, for example, when performing multiple independent network requests. The index of the result for each promise corresponds to the index of the operation within the argument to Promise.all. In these cases, it can be useful to use array destructuring to name the argument of the then callback:

 Promise.all([ 
  findAstronomers, 
  findAvailableTechnicians, 
  findAvailableEquipment 
]).then(function ([astronomers, technicians, equipment]) { 
  // use results for astronomers, technicians, and equipment 
});