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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.
I did that in my solution
to make it even shorter you could replace
sum = sum + numwith
sum += numOk, but this is not a kata's suggestion. Suggestion label should be used to improve the kata (tests, description, translations), it's not to ask for suggestions about your code, you can ask for that in your solution directly.
it show an error:
slice out of boundthis solution can be improved!
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