arrow-core | Λrrow Core is part of Λrrow , a functional companion | Functional Programming library
kandi X-RAY | arrow-core Summary
kandi X-RAY | arrow-core Summary
Λrrow Core is part of Λrrow. Global properties and checks come from arrow repository.
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QUESTION
Given this (extremely simplified) code :
...ANSWER
Answered 2020-Dec-10 at 13:41The @Optics
compiler generates 2 optics for that property.
MigrationStatus.token
& MigrationStatus.tokenNullable
or MigrationStatus.tokenOption
in the case of Option
.
This is because there are two different Optics
that are useful here.
Lens
which hasset
&get
and in this case `LensOptional
which hasset
&getOption
and in this case `Optional
The first one is the one you'd want to use in this case to be able to set String?
to null
.
So MigrationStatus.tokenNullable.set(null)
.
The latter is more useful for the DSL, and composition of Optics since if instead of String?
you had another data class or sealed class you'd want to operate on the value only in the case of not-null.
I hope that fully answers your question!
QUESTION
Below is the following test method I have built to make my life slightly easier using Glide.
...ANSWER
Answered 2020-Apr-02 at 02:25I added the following item to the top of the import list
import kotlin.jvm.functions.*
Although greyed out and seeming to be unused, I was able to correctly build the project.
QUESTION
ANSWER
Answered 2020-Jan-30 at 01:24There is no need for any special construct beside try/catch
in Kotlin, since it's also already an expression. For that reason it was removed from Arrow, you can simply write:
QUESTION
I'm using Kotlin and Arrow and the WebClient from spring-webflux
. What I'd like to do is to transform a Mono instance to an Either.
The Either
instance is created by calling Either.right(..)
when the response of the WebClient
is successful or Either.left(..)
when WebClient
returns an error.
What I'm looking for is a method in Mono
similar to Either.fold(..) where I can map over the successful and erroneous result and return a different type than a Mono
. Something like this (pseudo-code which doesn't work):
ANSWER
Answered 2018-Apr-24 at 12:07I'm not really familiar with that Arrow library nor the typical use case for it, so I'll use Java snippets to make my point here.
First I'd like first to point that this type seems to be blocking and not lazy (unlike Mono
). Translating a Mono
to that type means that you'll make your code blocking and that you shouldn't do that, for example, in the middle of a Controller handler or you will block your whole server.
This is more or less the equivalent of this:
QUESTION
I'm trying to test my Kotlin code, which has Arrow-kt types, using Spock in Groovy. However, I'm not able to use Arrow-kt's additions such as Some
. For example, I have a test as follows:
ANSWER
Answered 2019-Jan-15 at 06:10Yes, you can use Arrow Datatypes in Groovy
, the result is not as idiomatic as in Kotlin
because the library heavily depends on extension functions and functions in the companion object
Example
QUESTION
I'm building a simple project with spring boot and spring-kafka, I can't configure it in order to make it work, it's a simple application that generates notes(author, content, createddatetime, lastmodifieddatetime) and sends events based on the notes when they are created.
I have been playing with it with 2 days but I guess I'm not getting it.
Here is my configuration, I'm pretty sure it has a lot of boiler plate but I've been using several examples to make mine work.
I have 2 producer and consumer factories because I need a default one, is that true? Do I need to create a custom factory for each type of message I am willing to send?
My application.yml
...ANSWER
Answered 2018-Dec-06 at 18:47Your problem that you populate your customized JsonDeserializer
into the keyDeserializer
on the ConsumerFactory
:
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