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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.
Array.map(fn)executes a function on each item in an array and returns a new array of the transformed items.more info on Array map here
x => doThing(x)is (practically) the same asfunction(x) { return doThing(x) }more info on Arrow functions here
Works just fine, memoization at its best ;)