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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.
Thats because whoever wrote this kata is a freakin tool----same here.
You're not handling nested objects correctly.
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I can see you have solved the kata with another method. But to answer your question, reading the error messages reveals that
TypeError: s.replaceAll is not a function.This comment is hidden because it contains spoiler information about the solution