External module "promise/monadic-operations"

Lifts a single value or a function into a Promise-like object. Provides a method of wrapping a single value or a function into a Promise, in order that the following operation may conform to the standard Promise operation. In some scenario, we may first attempt to get a value from cache. Motivation. In this case, we need to return a value. However, if the value is not available in the cache, we may have to go ahead to load it asynchronously. Loading a value asynchronously usually returns a Promise. To untify the return from two cases, we escalate a single value into a Promise.

Lifts a value into an rejected state.

Converts the given promise into a promise which does not reject anything.

Converts a given promise into another promise which ensures that the given guard evalutes to be true from the state of the given promise.

Transforms a given promise with additonal pipeline processing. Specifically, in this method, compared to the given promise, the return promise contains validating and adpating stages.

Settles a promise.

Transforms a given promise into one promise with our own implementation.