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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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A single multiplication is bound to be much more efficient than any number of reallocations, assuming
countis more than 1. Hence it's sorta one of best practices as well.This comment is hidden because it contains spoiler information about the solution
This totally looks like the tersest one there so far, but I doubt it would be the most efficient possible, performance-wise. Namely, AFAIK lambdas passed to library routines are not inlined, and call/return instructions still cost CPU time.