Curriculum Idioms & ecosystem Defer exercise 3 · mcq
Defer
When are the arguments to a deferred call evaluated?
This is the most common defer gotcha.
``go
i := 1
defer fmt.Println("i =", i)
i = 2
// function returns — what prints?
``
Pick the answer.
TypeScript reference
About this theme
defer fn() schedules fn to run when the surrounding function returns. The closest TS analogue is a try/finally you don't have to indent. Multiple defers run LIFO. Arguments are evaluated at the defer site, not at the call site — a common surprise. Also: defer in a loop accumulates.