conversion to string and lookup in it can't be efficient

looks like String(bool) comparison against "true"

Cool solution, I learned something new!

Its not working, I get the error message:
"Value of type 'String' has no member 'localizedCaseInsensitiveContains'"
What ist the problem?

It's look like more difficult then 8 kyu

This is what the documentation says

/// Equivalent to:
///
///     range(of: other, options: .caseInsensitiveSearch,
///           locale: Locale.current) != nil

https://developer.apple.com/documentation/swift/stringprotocol/localizedcaseinsensitivecontains(_:)

Please use a spoiler flag, comments are visible to everyone by default (I've just put the flag on for you this time).

I had no idea the stride function existed, I'm excited to try it out!

Can you please explain how you are able to use two elements in the closure? I thought you could only use one in the first function. Thanks!

Nice!

Favorite short solution, without if condition...

Isn't it a bit of a hack to change up the node itself? I mean like that it's not a node like in a standard linked list.

need a third button --> Successful Hack