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Demo 16

async returns promise

An async function always returns a promise.

fully simulatedcurated scenariodoes not execute real code
Short answer

The key output order is true. `async` wraps returned values in a resolved promise.

Real-world bug this helps solve

The UI, test, redirect, or log moves forward before the async result is actually ready. Callers must `await` or `.then` async function results.

Common wrong assumption

Expecting an async function to return the raw value.

Fix direction

Await real dependencies, start independent work together, and choose the loop pattern that matches the behavior you need.

Fixed code pattern
const [user, posts] = await Promise.all([
  fetchUser(),
  fetchPosts()
]);
Visual proof

The console lane proves the visible order: true. The active line and queues show why source order changed.

How to verify in a real app

Measure before and after with logs or test spies: the dependent line should run only after the awaited operation finishes.

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Related cases

Continue with nearby confusion while the mental model is fresh.

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