When either of these options occur, the associated handlers queued up by a promise's then method are called. The eventual state of a pending promise can either be fulfilled with a value or rejected with a reason (error). rejected: meaning that the operation failed.fulfilled: meaning that the operation was completed successfully.pending: initial state, neither fulfilled nor rejected.This lets asynchronous methods return values like synchronous methods: instead of immediately returning the final value, the asynchronous method returns a promise to supply the value at some point in the future. It allows you to associate handlers with an asynchronous action's eventual success value or failure reason. ()Ī Promise is a proxy for a value not necessarily known when the promise is created.Object.prototype._lookupSetter_() Deprecated.Object.prototype._lookupGetter_() Deprecated.Object.prototype._defineSetter_() Deprecated.Object.prototype._defineGetter_() Deprecated.
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