Promise Implementation and Async Flow Questions

Focuses on the internal structure and behavior of Promise objects and the surrounding asynchronous execution model. Topics include the Promise state machine from pending to fulfilled or rejected, how resolve and reject operate, then chaining and callback registration, error propagation and catch semantics, and common combinators such as Promise.all. Candidates should understand the microtask queue and how promise callbacks are scheduled relative to the event loop, and be able to implement a basic Promise constructor and then method sufficient for interview level correctness. Assessment typically emphasizes correct handling of asynchronous resolution, chaining, and basic thenable assimilation rather than full specification edge cases.