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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.
Strings have elements, arrays have elements. Certain iteration methods like map cant iterate a string without transforming it into an array. Certain ones can, like a for loop. You can access elements of a string the same way you can an array str[0]...
You can actually
It's iterable
In fact, you can. Read the docs.