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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.
Thanks
this is called "fail fast" implementation. Sounds perfect.
you should read this, especially the part about "Special constructs"
Interesting, I still don't understand the {4} part, I mean I know it is about the last number of digits, but do you have to use it something similar when you want to work with some elements in a String value? What about if I want to work with the first n positions?