A `response` type is used for function return values that can fail. It can be `(ok value)` or `(err value)`. In a public function, returning `err` will roll back all state changes.
clarity (ok true) (err u404)
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Data Types · easy
9. Response Types (ok, err)
Standardizing success and failure.
Check your understanding
1. What happens if a public function returns (err ...)?