Explain the three states of a Promise.

Q: Explain the three states of a Promise.

**Pending:** The initial state, when the Promise is neither fulfilled nor rejected. **Fulfilled:** The state when the asynchronous operation completes successfully. **Rejected:** The state when the asynchronous operation encounters an error.

Difficulty: 3/10

promise lifecycle, async handling, error propagation

pending, fulfilled and rejected are three states of a promise.

1
Pending: The initial state, when the Promise is neither fulfilled nor rejected.
2
Fulfilled: The state when the asynchronous operation completes successfully.
3
Rejected: The state when the asynchronous operation encounters an error.

Scenario Questions

0-2 years experience

1If you call fetch('/api') and then chain .then(...).catch(...), what state is the promise in right after the fetch call returns?
2How would you use a promise to wait for two independent async operations to finish before proceeding?
3What happens if you return a value from a .then handler—what state does the new promise enter?

Follow-up Questions