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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.
Awesome. It's definitely the best practice
A lambda is just a function created with a single expression and no name. So, the difference is negligible
For those who struggle with it:
You need to return the max possible difference between the single string length from the first array and the single string length from the second array.
P.S.: Nice kata, but I would give it 6 kyus.
Nice Kata. Makes to think in different ways simultaneously