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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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That's the thing, they aren't. It's a culture thing :D
People just upvote one-liners as best practice for the sole purpose that it compacts more code into a smaller space and is thus seen as minimalist or cool.
Of course, sometimes (such as for list comprehensions or for cases where it's easier to use a built-in function) one-liners are actually best practice, but half the time, it's more likely to be someone using some esoteric, relatively niche and/or inefficient code in a one-liner.
But it's been 11 months so you probably know by now.
one liners can be clever, but not best practice most of the time (I agree with you)
I fully agree with you. It should not be. This is not so clear especially for the beginners like me.
This is not what that means. The description means that when you are given an input like
(3, 2), then your result would be6x^1. Now in real life, an exponent of^1can simply be ignored, and we would just write6x, however the kata specifically says not to truncate this (because it is an 8kyu kata), so the correct result is just6x^1.