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jamiebuilds/tweet-promise-isfulfilled.js

Created June 14, 2021 17:07
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tweet-promise-isfulfilled.js
// Synchronously check if a promise has already been fulfilled
Promise.isFulfilled(promise)
// >> true | false
// This allow you to make decisions synchronously
if (Promise.isFulfilled(promise)) {
// We know we're not taking a "risk" awaiting this promise
await promise
} else {
// i.e. Avoid "flash of loading spinner"
renderLoadingScreen()
await promise
}
// You cannot use this API to get the fulfilled value of the
// promise synchronously, avoiding the most serious "zalgo" problems.
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