In genetic algorithms you often want to use the concept of Elitism when you keep small amount of fittest chromosomes (2-4) unchanged by crossover. Otherewise best individuals are being replaced by random childrens. It highly improves performance here.

Not enough tests. Most voted C# solution here returns true for "adda", while it should be false.

Wrong. This solution will return true for "adda", but it should be false.

I confirm. Had to submit it on Python.

I know about conditional operator. I want to know how it works with function and why second pair of empty parenthesis needed.

Can somebody please direct me do documentation describing this feature?

This one should be level 7 kyu

Should add test case as 127.0.0.01 It will pass in solutions of many.

Incorrect solution. '127.0.0.01' will pass.

We can sort katas by 'Easiest' or 'Hardest'. Do katas of same kyu differs in difficulty? If yes how does difficulty defined?

This is hard for 6th kyu, should be 5.

What a nice solution!