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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.
Wow. Thanks for explaining this. Cheers!
substr is different from substring. the first parameter computes the correct starting location of the substring by using Math.ceil, and the second parameter tells substr (not the same as substring) to get the next 1 or 2 characters depending on the parity of the length of the string.