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What do you mean by promise?

A Promise is an object which shows the result of the asynchronous operation. The result can be a resolved value or a reason why the process failed like “a network error occurred.

A promise can be any of the 3 states:-
  • Pending - the promise’s result hasn’t yet been identified because the asynchronous operation has not been completed yet.
  • Fulfilled - the asynchronous operation has completed, and the promise has now a resolved value.
  • Rejected - the asynchronous operation has failed, and the promise has a reason that indicates why the process failed.

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