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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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Let's say you have to find out if 100000000000 is a prime number, when you find it's divisible by 2, you already know it's not a prime number, there is no need to check all the other numbers at all.
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The negative is that it will test all possible dividers to make sure there are none. An early return would be welcome.
That's true but the description never promises more than "Define a function ... that takes one integer argument...". Don't mind me, I'm just a math nerd :)
Cool Algorithm
Prime numbers are natural numbers greater than 1 (kata's description even mentions that), so there's no need to check divisors of negative numbers, just return false.
Although it doesn't work for negative integers :)
this is the best one for me
What's UB