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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.
if your interested, check out repl.it. It's convenient to have open.
Thats what the test cases are for. You can put whatever you want there, including
console.logor your own test cases. Did you have something else in mind?Its already there. Babel is used to transform all JS. A few edge features arent supported as the version of Babel is a bit out of date.