Quiz · 3 questions

🔷 Types & Interfaces — Naming the Shapes

type aliases, interfaces, structural typing, the closer-than-you-think comparison

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01What's the practical difference between type and interface?

Hint

Try writing type Color = 'red' | 'blue' as an interface. You can't — that's one of the differences.

02What does 'structural typing' mean in TypeScript?

Hint

If you've used Python's Protocols or Go's interfaces, that's structural typing in a different language. TypeScript took the same idea further.

03Why does readonly only enforce at compile time, not at runtime?

Hint

Recall the two-layer mental model from the Foundations track. readonly lives entirely in the type layer.

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