2 min read


Over the last year or so, we have been writing a lot of Kotlin at work. There is a consensus within the team that we all like working with the language. It really helps our productivity a lot by reducing a lot of boilerplate, we can actively enforce nullability rules that makes business logic obvious, and having the option to make extension functions offers a lot of flexibility.

However, as a wise man once said, with great power comes great resposibility. There have been a few times where I see code written in a “Kotliny” way that I feel makes things look more complicated than it should be.

Take this one I saw at a recent pull request:

isSetUpDone?.run {
   if (shouldShowNotification()) {
} ?: showNotification()

I stared at that piece of code for five minutes, trying to figure out what it does. I read and re-read. Maybe I am too stupid to understand it. I asked the author – “Maybe put a comment in to figure out what this is doing? It is a bit hard to read.” I got a response: “Let me come over and explain.” He then proceeded to explain to me what run and ?: does (and I did not have the energy to ask him to stop mansplaining 🙄 ).

Now, my friends, that is not the point; and I have talked a bit about this in the past.

Complex != Genius

Just because something looks complex does not mean it’s ingeniuty at work. What if somebody else new joins the team? What if somebody else needs to make changes to this feature? What if the original author left the company and won’t be there to come over and explain anymore?

After talking to the author, we have come to the conclusion that what we wanted to do was call showNotification() only if all conditions are satisfied. So really, we can move isSetUpDone (which *is* one of the conditions!) to inside the shouldShowNotification() function, and we end up with a much simpler, much more readable implementation.

if (shouldShowNotification()) {

If there is one thing I have learned from years and years of writing and reading code, it is that it takes a lot more time and effort to make things as simple as possible.

(via GIPHY)

We need to be careful that we do not fall into the trap of “How do I write this in Kotlin?”; that instead of leveraging the language, we end up abusing it.

I guess sometimes we get too caught up with making sure we can show off our chops and use these fancy new language features that we lose sight of what is really important – doing our bit in writing code that lasts forever.