Promise.longRace()

Promise.longRace(
  Iterable<any>|Promise<Iterable<any>> input,
  [int numWinners = 1],
  [Array results = []]
) -> Promise

Similar to Promise.race, but will not reject as long as there is a chance that at least numWinners will sucessfully resolve.

Usage

npm install --save long-race

Then just require('long-race') to augment the global Promise object with the longRace() method.

Example

The following code

let car1 = new Promise((r, reject) => setTimeout(reject, 2000, 'Car 1.'));
let car2 = new Promise(resolve => setTimeout(resolve, 4000, 'Car 2.'));
let car3 = new Promise(resolve => setTimeout(resolve, 3000, 'Car 3.'));
let car4 = new Promise(resolve => setTimeout(resolve, 6000, 'Car 4.'));
 
Promise.properRace([car1, car2, car3, car4], 3).then(winners => {
  console.log('Race ended');
  console.log('Gold medal:', winners[0]);
  console.log('Silver medal:', winners[1]);
  console.log('Bronze medal:', winners[2]);
});

will output:

Race ended
Gold medal: Car 3.
Silver medal: Car 2.
Bronze medal: Car 4.

Credits

https://www.jcore.com/2016/12/18/promise-me-you-wont-use-promise-race/