Created: 2022-01-29T22:38:25-06:00
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Promises/Futures are something which is fired off and has an indeterminate value until completed.
A promise is fulfilled when a value is determined.
A promise is rejected if that value is an error.
A `then` method associates a callback to when the promise is fulfilled or rejected.
NB in languages like Nim or Io there may be an async scheduler instead which pauses a thread until the future is complete replacing it with the error or value. Promise/A+ is specifically a NodeJS/javascript specification.