Quiz · 3 questions

🏛️ Classes — OO in TypeScript

Syntax, access modifiers, abstract, static, parameter properties, TC39 decorators

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Quiz

01What's the difference between private and #private?

Hint

Try accessing obj['secret'] for both forms. The TypeScript private compiles fine; the JS private throws or returns undefined.

02What do parameter properties do?

Hint

Without parameter properties, you'd write the field declaration, the constructor parameter, and the assignment separately. Parameter properties collapse all three.

03What's the difference between TC39 decorators and the older TypeScript experimentalDecorators?

Hint

Check your tsconfig — if experimentalDecorators: true is set, you're on the older version. Without that flag, TypeScript 5+ uses Stage 3.

← PreviousTC39 Decorators: The New (Stage 3) Flavor ⚡ Async & Promises — Typed Concurrency →`Promise<T>`: The Typed Async Value

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