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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.
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Great solution. I solved it the same way.
haha this is my code too
finally
smartest!
That's a really clever one liner! Kudos!
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It's an ES6 arrow function https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/Arrow_functions
'b' is, as T-dex said, the placeholder and the exclamation mark is a negation ('not' geese.includes(b)).
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