Type Signature · #50 · 2026-05-24
What is the return type of `f`?
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.
function f(x?: { a: number }) {
return x?.a;
}
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Press 1 through 4, or tap a numbered choice, to answer. Back to hub