I have a pure JavaScript Promise (built-in implementation or poly-fill):
var promise = new Promise(function (resolve, reject) { /* ... */ });
From the specification, a Promise can be one of:
- ‘settled’ and ‘resolved’
- ‘settled’ and ‘rejected’
- ‘pending’
I have a use case where I wish to interrogate the Promise synchronously and determine:
-
is the Promise settled?
-
if so, is the Promise resolved?
I know that I can use #then() to schedule work to be performed asynchronously after the Promise changes state. I am NOT asking how to do this.
This question is specifically about synchronous interrogation of a Promise’s state. How can I achieve this?