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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.
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Nice and readable. Well done.
e is a math constant, Euler's number (2,72)
What would you name it instead? I came up with the same solution, but used "item" instead of "e." (Also - how would you use "e" as a number in math? - You got me all curious now!)
I solved the problem in the same way, but
if the array has a value of 0 , the function will return -0
In Math "e" is a number, not sure if is a good idea to name it with "e", but your solution is great!