kotlinlang #arrow

org.gradle.api.ProjectConfigurationException: A problem occurred configuring project ':arrow-annotations-processor'.
    at org.gradle.configuration.project.LifecycleProjectEvaluator.wrapException(LifecycleProjectEvaluator.java:79)
    at org.gradle.configuration.project.LifecycleProjectEvaluator.addConfigurationFailure(LifecycleProjectEvaluator.java:73)
    at org.gradle.configuration.project.LifecycleProjectEvaluator.access$400(LifecycleProjectEvaluator.java:54)
    at org.gradle.configuration.project.LifecycleProjectEvaluator$EvaluateProject.run(LifecycleProjectEvaluator.java:107)
    
Caused by: org.gradle.api.GradleScriptException: A problem occurred evaluating project ':arrow-annotations-processor'.
    at org.gradle.groovy.scripts.internal.DefaultScriptRunnerFactory$ScriptRunnerImpl.run(DefaultScriptRunnerFactory.java:92)
    at org.gradle.configuration.DefaultScriptPluginFactory$ScriptPluginImpl$2.run(DefaultScriptPluginFactory.java:206)
    at org.gradle.configuration.ProjectScriptTarget.addConfiguration(ProjectScriptTarget.java:77)

Caused by: org.gradle.api.GradleException: tools.jar not found at your JAVA_HOME dir /Library/Java/JavaVirtualMachines/jdk-10.0.1.jdk/Contents/Home.
Building with a JRE or JDK9 is currently not supported.
    at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)

stojan

11/17/2018, 7:59 PM

@Leandro Borges Ferreira suggested I could play more with the Hangman and abstract over the container. Here is the result: https://gist.github.com/LordRaydenMK/0be8f70f860a862e69daf262b4a83e17 is

Async

the right typeclass? Do you see anything I could do better?

pakoito

11/17/2018, 8:00 PM

there are no treads, and you can do some error handling that async doesn’t 😄

raulraja

11/17/2018, 9:28 PM

really we need

delay

in monad defer which is the same as invoke

tmg

11/21/2018, 2:17 PM

composing the functions?

raulraja

11/21/2018, 2:38 PM

@tginiotis do you have a sample code with types that illustrates the problem?

tmg

11/21/2018, 2:45 PM

so you actually need a product?

raulraja

11/21/2018, 2:56 PM

val result: Map<String, List<String>> = listOf("one", "two", "three").groupBy { 
  if (it.contains("n")) "nCount"
  else if (it.contains("x")) "xCount"
  else "others"
}

Leandro Borges Ferreira

11/21/2018, 8:57 PM

Some problem with ANK

pakoito

11/27/2018, 7:05 PM

you can do it multiple ways, with

Subject

, with

Observable.create

, and with

ObservableK.async

. The first one is more imperative (read easier) and doesn't have coordinated cancellation or cleanup. If you want to close the websocket when there's a failure, use

Observable.create

ObservableK.async

will get support for that too soon, thanks to @simon.vergauwen and @Jorge Castillo

👍🏻 2

pakoito

11/28/2018, 2:05 PM

-.js

pakoito

11/29/2018, 10:52 AM

post it on twitter, I’ll help promoing it 😄

simon.vergauwen

12/03/2018, 2:18 PM

You should be able to find it in

arrow-core-instances

jacob

12/05/2018, 12:25 PM

I can't believe how good the docs are getting. who do we have to thank?

pakoito

12/05/2018, 10:55 PM

@Mike it’s exactly like the match between your function and filterOrElse 😄

raulraja

12/08/2018, 1:21 AM

@Mike not sure about windows but if it's code related you can just use

test

locally and when you send the PR it will try the full build on travis and run detekt

Miguel Coleto

12/08/2018, 12:19 PM

You can do

assemble

instead of build for avoiding detekt

raulraja

12/10/2018, 1:22 PM

@AdrianRaFo in my experience while it's nice writing the build files in Kotlin it's sometimes hard to integrate new stuff since most plugins offer examples and documentation around the groovy style scripts for gradle. In my opinion it's not worth the effort and we have many other areas where help would cause a bigger impact.

👍 5

Saša Šijak

12/14/2018, 2:12 PM

I saw this link in arrow github project https://bartoszmilewski.com/2014/10/28/category-theory-for-programmers-the-preface/ Is it worth it to go through this "course"? Are topics well explained? Which languages he use for the examples?

pakoito

12/25/2018, 10:11 PM

we’re phasing out invoke in favor of delay

➕ 1

pakoito

12/25/2018, 10:18 PM

everything else looks great to me

streetsofboston

12/26/2018, 9:57 PM

Maybe what @rrader is looking for is a new type that can model `Undefined`/`Defined` (instead of

Optional

Nullable

val columnValue : Defined<Option<String>>

val columnValue: Defined<String?>

Overloading the

Optional

(

Option

) or

Nullable

with ‘(un)defined’ is not a good idea, in my opinion. Don’t mix them 😉

Egor Trutenko

12/26/2018, 10:12 PM

Also, Kotlin Serialization is the only serialization library so far (or of which I'm aware) that has

@Optional

annotation, so it helps a little

Egor Trutenko

12/26/2018, 10:17 PM

It's just that both optionality and nullability are things

acando86

12/27/2018, 9:40 AM

My two cents. I tend to agree me too that it's bad design.

null

should not be used as a valid value IMO (not in the api response, not in json, not in code). null doesn't convey lot of information. if null is used to express something, chances are there are more explicit ways to encode that information semantically and in a more type-safe way (if option alone is not enough to express all the possible scenarios), instead of appending a meaning to the null value (for instance, ADTs etc). Close to the DB layer (in the code) it might make sense to store raw null values, but in between a db and the api response i would expect a number of mapping layers and business logic where relying on a specific meaning of null values is not necessary and maybe (IMO) not even advisable.

veiset

01/03/2019, 1:56 PM

Oh! So you would basically use it to delay the side effects until you're at the end of the world?

raulraja

01/03/2019, 9:07 PM

The point in which an entire abstract program defined in terms of kinds and type classes is made concrete to IO which usually happens in main or wherever you are given control in your framework of choice. If that doesn't make sense I can provide code examples in a sec

bjonnh

01/06/2019, 5:59 PM

https://gist.github.com/bjonnh/e7358781df1137da59fec6f37d0ee163

Title

bjonnh

01/06/2019, 5:59 PM

https://gist.github.com/bjonnh/e7358781df1137da59fec6f37d0ee163

raulraja

01/06/2019, 6:02 PM

seems to be missing the error types

it does not compile

bjonnh

01/06/2019, 6:04 PM

my bad I had a file with the same package

that should do it now

👍 1

I did see things about bindIn

(updated object to class so I can have a main)

I hope you can see what I tried to do

raulraja

01/06/2019, 7:17 PM

https://gist.github.com/raulraja/44b34ca2b72f9047318194227380a81d

👍 2

we are fixing now the method I mentioned

toIO

that is currently missbehaving

bjonnh

01/06/2019, 7:56 PM

thanks!

not really an arrow question, but I was wondering about the (thread) safety of my handling of the datetime. As this function is ultimately called by the user in the GUI (through TornadoFX events).

so this is going to appear on github your correction for toIO? I am using the latest github version in my project there were a lot of things missing in 0.8.2

Your solution works perfectly thanks a lot!

raulraja

01/06/2019, 9:45 PM

no problem, the fix for toIO will come up in .9.0 in a couple of weeks

will keep the channel posted

➕ 1

View count: 6