JavaScript Program Architecture Quiz

Check your understanding of module boundaries, dependency direction, state ownership, adapters, lifecycle, and composition roots.

10 questions ~10 min Intermediate

Knowledge check

Check your understanding of module boundaries, dependency direction, state ownership, adapters, lifecycle, and composition roots.

You can retake this quiz whenever you like.

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What should primarily define a module boundary?

Architecture starts with responsibility and contracts.
Why keep implementation helpers private?

Private helpers reduce incidental coupling.
Where should concrete dependency selection usually happen?

Composition code can choose concrete implementations.
Why give mutable state one clear owner?

Ownership makes mutations easier to reason about.
Where should DOM mutation normally live?

DOM mutation is a side effect.
What does an infrastructure adapter hide?

Adapters isolate external details behind a contract.
What can two features sharing one concept suggest?

A lower-level shared concept can restore dependency direction.
Why expose cleanup for long-lived resources?

Resources need deliberate release.
What does dependency injection provide?

The caller supplies the replaceable dependency.
What is a composition root responsible for?

It is the explicit wiring point.

Back to lesson Next: JavaScript Scripts and Modules

What should primarily define a module boundary?