What happens if the promise executor throws an error in JavaScript?
The promise is rejected with the thrown error. You do not need to try/catch inside the executor; the Promise constructor catches thrown errors and rejects automatically.
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More FAQs in Creating Promises in JavaScript
Use new Promise((resolve, reject) => { ... }). The executor runs immediately. Call resolve(value) to fulfill or reject(reason) to reject. For already-settled promises, use Promise.resolve(value) or Promise.reject(reason).
Immediately and synchronously, when the promise is created. The executor is not deferred. But resolve/reject can be called asynchronously (inside a setTimeout, event handler, etc.).
Creating an already-fulfilled promise. Use it when you have a value but need a promise (e.g., returning from a function that sometimes does sync work). Example: if (cached) return Promise.resolve(cached); else return fetch(url);
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