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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
Technically, it's more like passing by a const reference and rebinding the reference.
AFAIK functions in every dynamic language always receives a fresh value for primitive types. It only happens in the like of C/C++/C#/Rust via explicitly passed by reference (by
&/ref), and they're the complete opposite of a dynamic language.It's nothing "extra careful", you should obtain the knowledge to know how they behave so you can put your effort on worrying about things that actually matter instead ;-)
Not for primitive types as they're always passed by value.