Errors

Handle errors like any other value in your program. Every operation that can fail returns a discriminated union. No throws. No panics. Just honest return values that force you to confront reality.

Article: Errors

It is 3am and something between the request and the response is swallowing an error. Six functions. Three nested catch blocks. Forty minutes of reading. The problem started when somebody wrote a signature that promised a value and could not keep the promise.

Three rules: panics in code that could have returned a Result, error types that erase what went wrong, and the silent catch.