Functions Code Diary Entries

This is part of the Semicolon&Sons Code Diary - consisting of lessons learned on the job.

Actively enumerate what possible return values functions should have and consider possible exceptions
Argument order should be consistent in your API
Do not refer to or call a function defined later in the file
If a method is unavailable you probably have the wrong type
Watch out for API functions with multiple return types
Wrap in parentheses to avoid syntax errors with operators over many lines

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