A promise is a commitment by someone to do or not do something. As a noun promise means a declaration assuring that one will or will not do something.
Sep 29, 2017 ... The Promise object represents the eventual completion (or failure) of an asynchronous operation, and its resulting value.
Promise definition, a declaration that something will or will not be done, given, etc ., by one: unkept political promises. See more.
Define promise: a declaration that one will do or refrain from doing something specified — promise in a sentence.
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Promises are an alternative to callbacks for delivering the results of an asynchronous computation. They require more effort from implementors of asynchronous ...