Type Signature · #25 · 2026-04-29
What is type `R`?
TypeScript ·Difficulty 1/3
How to play
Read the TypeScript snippet and pick the correct type from four choices. Think about inference, narrowing, and utility types. Press 1–4 or click to answer.
type Keys = 'x' | 'y' | 'z';
type R = Record<Keys, boolean>;
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Press 1 through 4, or tap a numbered choice, to answer. Back to hub