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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.
thats very weird
add 0 or [] to reduce, (sum, 0) for example. this Excercise is fundamentally wrong because it returns purposefully zero when given and empty array so, don't be upset about this challenge.
Set the initial value of your reduce to 0
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For loops definitely not an ideal first experience, a fundamental experience yea, and it's not the only challenge available on that level at the same time.
That's not a kata issue. Kata's rank is the same for all languages and it's not up to the kata's author to set.
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