Lesson 04 · 10 min
Functions
Type the input. TS often infers the output itself.
10 minLesson 4 of 10Practice includedAsk AI on any point
What matters in a function is its arguments and what it returns. You can skip the return type if it's obvious from return. Write it on public functions and when you want to lock in the contract: then an accidental return null becomes an error, not a surprise. The Functions section covers optional, rest, void and callbacks.
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