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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.
You can always check if a function works on MDN, for example here you can see that you function isn't supported :/
replaceAlldoesn't work in Node.Read this first, so we can help you. With only that no one can guess what's wrong.