Hi all, I'm learning Kotlin through koans and I sa...

# getting-started

[Ivan Brko]

Hi all, I'm learning Kotlin through koans and I saw this code (not my, part of the exercise). The code is here: https://pastebin.com/A7vwUqiy

I don't understand why the extension method set (at the bottom of the snippet) was written as an extension method? why not just write it as a normal method inside the Tag class? Is this just more idiomatic in Kotlin, or do you achieve something here that cannot be achieved with normal methods?

[Dennis]

One could argue that set is part of the DSL and if you put it in a different package then you have isolated the DSL related methods from the class itself

[Ivan Brko]

Ok, thanks for info 👍
So it doesn't make sanse to have it like this in the same file, but rather having it totally separated from the class itslef

[Ruckus]

Sometimes it does. Check out @elizarov's article about extension-oriented design: https://medium.com/@elizarov/extension-oriented-design-13f4f27deaee

[Ivan Brko]

Thanks, will do