Tech Challenge
2026-07-28
🔷
Daily Tech Challenge
TypeScript
medium
Question 1 of 5
With `strict` enabled, which of the three calls below does the compiler reject?
Example
function a(x: number, y?: number) {}
function b(x: number, y: number | undefined) {}
a(1); // call 1
b(1); // call 2
b(1, undefined); // call 3Tuesday, July 28, 2026 · A new challenge drops every day