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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.
then this guy only completed 7 Katas lol. how ironic
Because some people (icluding me) didn't knew about .replace.
It's not bad practice. It's just different approach taking into consideration the performance of the solution.
try to figure it out why paj :D