The then method always returns a promise that will either be handled or rejected.
In our example code, we assign the output to the reapPromise variable, which will hold the value:
var reapPromise = getInputPromise()
.then(function (input) {
}, function (reason) {
});The reapPromise variable is the new promise for the return value of either handler. Only one handler will ever be called and it will be responsible for resolving reapPromise as a function, which can only either return a value (a future value) or throw an exception.
Whatever is the case, there will be the following possible outcomes:
If you return a value in a handler,
reapPromisewill get fulfilledIf an exception is thrown in a handler,
reapPromisewill get rejectedIf a promise is returned in a handler,
reapPromisewill become that promiseAs it will become a new promise, it will be useful for managing delays, combining results, or recovering from errors.
If the getInputPromise() promise gets rejected and you forget...