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Typescript Generics Patterns And Constraints Practice Exam

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Exam details

  • ✓50 questions drawn from 241 cards
  • ✓Countdown timer — auto-submits when time runs out
  • ✓Pass mark 70% (real certification threshold)
  • ✓Full review of wrong answers at the end
  • ✓No signup required — save your score with a free account

Sample Questions

5 shown

Basic generic function signature?

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function identity<T>(x: T): T { return x; }

Constrain a generic to be an object with a 'length'?

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function len<T extends { length: number }>(x: T) { return x.length; }

Why does T extends string matter?

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Restricts T to string-assignable types — required when you use string-specific operations or template literal types.

Pass type arguments explicitly?

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identity<number>(42) — usually inferred.

Default type parameter?

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function pick<T, K extends keyof T = keyof T>(...) — K defaults to keyof T.

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