`Promise.race` use case?

I’d love to hear what are some use cases to the more obscure functions like Promise.race 😃

[spion]

@benjamingr I think not - the difference is that any will continue to wait for the successful fulfillment of one of the promises.

Basically:

.all - wait success of all, fail if just one

.some(arr, N) - wait success of N, fail when impossible to fulfill N (because arr.length - N + 1 have failed)

.any(arr) - wait for success of 1, fail when impossible to fulfill 1 (only when everyone fails)

.race(arr) - wait for 1 promise to succeed, fail if just a single one fails.

.settle(arr) - wait for all promises to settle (either with a value or with an error, doesnt matter)

[spion]

Sorry, I didn’t explain it very well. In a client side framework for example, I want the UI update to fail if the router’s route changes – there is no point in updating it anymore.

orRouteChangedFail() will fail if the route changes, causing the race to also fail.

Also,

Promise.any(someAction(), Promise.delay(1000)).then(value => ...)

will result with value == undefined – so if the action we’re waiting for also has no return results, we will be unable to distinguish the timeout from the successful completion of the action.