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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.
"true : false" is redundunt
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It's a snail
Check them again, you're given an array of arrays resembling an n x n matrix, you should return an array taking elements from the top-left, to the top-right, then from top-right, to bottom-right, etc. Like shown in those pictures.
There are some pictures there, what's exactly what you're not understanding from it?
Doesn't really matter since if the if-statement executes, it will return from the function at that point.