Using Promise Chains to Simplify Asynchronous Workflows in JavaScript
Learn how to replace nested callbacks with readable Promise chains, see a worked fetch example, and understand microtask timing and error‑handling trade‑offs.
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javascriptTests hang after advancing fake timers when using async/await with Jest modern fake timers
When using Jest's modern fake‑timer implementation (jest.useFakeTimers({ modern: true })) and advancing time with jest.advanceTimersByTime, microtasks created by Promise.resolve().then or async/await are not automatically flushed. This leaves pending promises unresolved, causing tests that await those promises to hang unless jest.runOnlyPendingTimers (or jes
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