The pre-conditions are called Guard Clauses [0]. It's really useful to think about guard clauses and explicitly look for them to ensure the pre-conditions are m

The pre-conditions are called Guard Clauses [0]. It's really useful to think about guard clauses and explicitly look for them to ensure the pre-conditions are met rather than have them appear over time as if/else blocks. edit: now that I've looked through the comments I see these are mentioned on numerous other threads. [0]: https://en.wikipedia.org/wiki/Guard_%28computer_science%29 https://en.wikipedia.org/wiki/Guard_%28computer_science%29