I'm finding it difficult to understand the distinction between calling a resolver's resolve() as opposed to fulfill(). Both functions and terms "resolve a promise" and "fulfill a promise" are frequently used interchangeably.
Can you provide guidance on when each should be used?
It is recommended to utilize the resolve method. When you use
deferredPromise.resolve(nextPromise)deferredPromise will now wait for nextPromise. If nextPromise is not a promise, it will be transformed into a fulfilled promise which notifies anything awaiting its value has become available.
The use of the fulfill method is discouraged and may eventually be phased out completely. In practical terms, fulfill serves the same purpose as resolve. Its only advantage is that deferredPromise.fulfill(value) may be easier for people to understand compared to deferredPromise.resolve(value), especially since resolve covers both nextPromise and finalValue.
The main issue with keeping fulfill in use is that
deferredPromise.fulfill(rejectedPromise)To put it simply, the concept of resolve involves either achieving success or encountering failure. This triggers the execution of actions specified within the then method and can only occur once for a given promise.
Fulfillment, on the other hand, denotes successful resolution, leading to the activation of success callbacks within the then method. Conversely, in case of failure, the counterpart of "fulfill" is known as reject.
Viewed from another angle, the status of a promise at any given moment can be classified as either "unresolved" (or sometimes referred to as pending) or "resolved", which further branches into "fulfilled" and "rejected" sub-statuses. A promise labeled as "fulfilled" contains a value, while one labeled as "rejected" holds a reason.
The terminology and methods used to represent these concepts vary across different APIs. Unfortunately, confusion often arises due to frequent misinterpretations, such as substituting "fullfill" when actually referring to "resolve" or vice versa.
My knowledge about Q might be limited, but based on my understanding, its resolve function essentially leads to fulfilling the promise:
Utilizing resolve with a non-promise value results in the promise being fulfilled by that specific value.
A notable twist comes into play when creating promises within the API. In particular, invoking deferred.resolve with an existing promise allows the initial promise to assimilate the state of the passed promise. This implies a somewhat peculiar scenario where a method named resolve does not directly result in resolving the promise.
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