Nice solution

This is fire

A c# string is nullable per default, unless you explicitly enable the nulllable check in the compiler, which was introduced in .NET 6+.
And even then you'll only get a warning during compilation time. If you ignore it, the program WILL crash when the string is null during runtime.

Yea, but we now know, because the input is string and not string? that the input isn't null ;)

Wow. Just wow.

• The "word" is not defined
• No random tests
• Trivial map/filter/reduce is not a novel kata idea

@paulsanchez ~ It was a total duplicate when it was first published. It was put into draft mode and changed before you saw it.

i think it's an enjoyable sort of kata, i would hint something about the validations on the description, i think it's also cool if you don't wish to list them. just mention that they have to be figured out or something.
good job!

I don't agree on them being equal. don't unpublish!

thanks, fixed

actually, here it is

Have you checked to see as to whether or not this kata has been already done? I think it has been in one form or another. If it is a duplicate, you should unpublish.

No random tests. Check out this documentation for more information.

I benchmarked this solution against the Linq variations, this method is faster for large arrays (n=10000)

so simple, so beautiful