Can promises be cancelled in JavaScript?
Promises themselves cannot be cancelled. But fetch and some other APIs support AbortController: create a controller, pass its signal to fetch, and call controller.abort() to cancel.
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More FAQs in How Promises Solve Callback Problems in JavaScript
Promises use .then chains instead of nested callbacks. Each .then returns a new promise, so you can chain flatly instead of nesting. This eliminates the pyramid of doom.
A promise settles exactly once. resolve/reject can only be called once. .then callbacks always run asynchronously as microtasks. You trust the promise spec, not the function calling the callback.
One .catch at the end of a .then chain handles errors from anywhere in the chain. With callbacks, each callback must check if (err) and propagate, which is repetitive.
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