Hi! I'm having a lot of fun learning with this pos...

# arrow

[matiaslev]

Hi!
I'm having a lot of fun learning with this post: https://www.47deg.com/blog/conway-swift/
Many thanks to @tomasruizlopez for that! 🎉
As a result of my learning, I carried the code from bow to arrow.
Here is the repository https://github.com/matiaslev/ArrowLifeGameComonads.
PS: If I do an Android project, I don't see the code generated for the type classes. If someone can help me it would be great.
I hope it is useful for another person.
Thanks!

[pakoito]

Have you done the additional setup step? xhttps://github.com/arrow-kt/arrow#additional-setup

[pakoito]

specifically the generated-kotlin-sources step

[matiaslev]

Hi @pakoito! 🙂
yes, but the generated code goes to a build/tmp folder that is not on the list. If I add the folder to the list, doesn't works also.

[pakoito]

...that's weird

[pakoito]

how are you triggering the build?

[pakoito]

./gradlew clean assemble?

[pakoito]

TODO() // Not Needed, use the implementation inside Functor this will except, the implementation is easy

flatMap { just(f(it)) }

[Jannis]

just inherit Functor : FocusedGridComonad: Comonad<ForFocusedGrid>, FocusedGridFunctor unless there are multiple defaults in the hierarchy kotlin won't complain ^^ Thats how most of the typeclasses are defined in arrow to avoid redundant overrides

[matiaslev]

thanks! I will see these improvements.
yes, after clean assemble I am in the same situation 🤔

[pakoito]

does the compiler give you any errors?

[matiaslev]

assemble works from the IDE... but give me this error if I run it from the console 🤔

* What went wrong:
Execution failed for task ':app:lintVitalRelease'.
> Lint infrastructure error
  Caused by: java.lang.reflect.InvocationTargetException
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:567)
        at com.android.tools.lint.gradle.api.ReflectiveLintRunner.runLint(ReflectiveLintRunner.kt:38)
        at com.android.build.gradle.tasks.LintBaseTask.runLint(LintBaseTask.java:114)
        at com.android.build.gradle.tasks.LintPerVariantTask.lint(LintPerVariantTask.java:64)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:567)

[Maureen]

Hi @matiaslev - @Jorge Castillo also did an Arrow version you can check out here: https://www.47deg.com/blog/conway-kotlin/

[matiaslev]

yes 🙂 thanks!

[matiaslev]

I translated the other one as it's a different approach and as a learning exercise. I will go over the SwiftUi - Compose translation too when I figure out the problem I am experiencing with android.

[Maureen]

Cool, if you finish it would be a great thing to add to our new media section 😉

[matiaslev]

wow thanks! I will let you know when it's ready. this will be an excellent motivation 🙂

[matiaslev]

@pakoito works for the stable android studio version but not for the preview. The real problem is the gradle version 🤔.

//    buildFeatures {
//        compose true
//    }

[aballano]

@matiaslev I've checked the code and looks good overall. If you have a branch for Android specifically where that problem can be seen let me know so I can take a look and maybe help you

[matiaslev]

thanks @aballano!
The bug I found is about using compose with kapt. It's a knwon issue documented here https://youtrack.jetbrains.com/issue/KT-34583.
I created different modules, in one the UI with compose, and in the other one arrow with meta. I will share the android project soon 🎉

[matiaslev]

@Maureen the Arrow + Compose implementation for the Comonad approach is done 🎉
https://github.com/matiaslev/ArrowComposeLifeGame/tree/master

Screen Recording 2020-01-14 at 16.09.47.mov

[Maureen]

Awesome, thanks! You can either submit a PR here: https://github.com/arrow-kt/arrow-media or I can do it next week when I’m back from vacation.

[matiaslev]

thanks for your time! https://github.com/arrow-kt/arrow-media/pull/18

[pakoito]

https://twitter.com/pacoworks/status/1217175219208642561

[pakoito]

do you have a handle I can refer to?

[pakoito]

I would add that video to the Readme, it looks brilliant! You just need to drag & drop it when editing it from the website.

[matiaslev]

thanks @pakoito! this community is amazing, I am pretty gratefull arrow

[matiaslev]

what do you mean by a handle? haha sorry, I didn't get it

[matiaslev]

I don't use social media really if it's what you mean. But I feel really happy to see people from which I learn sharing my work.
a lot of thanks for this!