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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.
Since your own solution uses regex, I am assuming your question lies with the Arrow Function notation.
a => expris roughly equivalent tofunction(a) {return expr;}. You can read about a few gotchas on the mdn page linked above.This comment is hidden because it contains spoiler information about the solution