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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.
I'd say its pretty obvious
Really clever, but is it good practice? I barely understand how this loop works, but does't it create ton of String objects? Instead you can use simple math actions here.
The way of C
Its a recursion, '+1' counts how many time the function was called.