kotlinlang #getting-started

Could you suggest DI (or something similar)? E.g. code example. Should work on iOS. I want to have static class/object/whatever, that I could access from other classes. This static class needs initialization (passing object, done once). I don't want to pass its reference everywhere.

ursus

05/06/2018, 2:19 AM

Hi guys, what are acutal good usecases for run, let, apply, also? Or is it just a hipster thing

ursus

05/06/2018, 12:11 PM

yea i do get when you assign to a property, or when you need a expression, but other than that im not sold on it, "?.let { }" why not just if != null

halirutan

05/07/2018, 5:29 AM

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if (element is SetDelayed || element is TagSetDelayed || element is Set || element is Condition)

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halirutan

05/08/2018, 2:09 AM

@nil2l @karelpeeters Thanks. I tried already a

listOf

solution and it didn't work because of inheritance. Well, I guess then the simple

is

solution is directly readable and I stick to this. Thanks for your efforts 🙂

dave08

05/08/2018, 1:02 PM

I have list1 that I need to associate to list2 one-to-one, is there an ideomatic way to do this?

bjonnh

05/10/2018, 12:08 AM

where datapoint:

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@Serializable
data class DataPoint (
        val name: String,
        val value: Double
)

Daniel

05/10/2018, 7:49 AM

Hey guys, Im new to this community. I have been working on kotlin since more than a year. I was trying to implement codestyling using detekt. It worked for me perfectly. so, I came up with an article which might help you. Thanks to @Artur Bosch for this awesome library. https://medium.com/@danielvivek2006/code-styling-for-kotlin-fa7a8291c254

👍 1

Amadiro

05/11/2018, 4:09 PM

Hey, probably a dumb question, but I've never worked with kotlin before; I just created a new kotlin project in intellij, and now I want to add an external project to it (https://github.com/xenomachina/kotlin-argparser for instance). How do I go about this? Do I have to add a gradle file or somesuch?

Ayden

05/13/2018, 1:24 AM

@araqnid Some of them really hard to understand. I don't know what does the tutorial want to achievement. Instead of spending time to code the solution, I spent more time on reading the instruction.

Andreas Sinz

05/14/2018, 8:51 PM

@kiptoo your

Box<T>

is invariant, that means

Box<Int>

is not a subtype of

Box<Number>

https://proandroiddev.com/understanding-generics-and-variance-in-kotlin-714c14564c47

jlepper

05/15/2018, 10:08 PM

Hi. I'm working with a team (and am myself) new to the JVM, Kotlin, and Rat Pack. I'm looking for any tutorials on how one goes about mocking outgoing http calls in tests.

holgerbrandl

05/16/2018, 6:41 AM

@Sudhir Singh Khanger @Hamza String is final and can’t be extended. But even if it would be flagged as

open

you would need to write

) : String()

to call its constructor. The

()

are not necessary when implementing an interface.

Hamza

05/17/2018, 3:17 PM

@Andreas Sinz it’s using JDA, which is a discord Bot API, and KUtils, which is a kotlin dsl for the command and stuff to make life easier

xenoterracide

05/17/2018, 11:22 PM

I don't know if that makes me happy or sad... if if was an object, or function that took a lambda...

Manoj

05/18/2018, 1:39 PM

any book / tutorials which walks through a backend project and teaches kotlin ?

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karelpeeters

05/19/2018, 7:39 AM

Yup, the problem is that those fields are vars, so it's ambiguous whether to add to the existing collection or create a new one and put it in

Tyler

05/22/2018, 3:29 PM

Hi, I keep seeing intents with java classes as an argument, but I'm not sure how to use a Kotlin one instead?

val i = Intent(this, ExampleJavaClass::class.java)

menegatti

05/24/2018, 7:08 AM

but as the accepted answer explains, it’s really hard to provide the data class sugar (equals, hashcode, copy) when there’s inheritance involved

arekolek

05/24/2018, 1:53 PM

I think you meant

Bar.() -> Unit

@menegatti

rook

05/25/2018, 7:38 PM

Just doing a sanity check

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when(e) {
  is String, Int -> /*do stuff*/
}

It doesn’t appear that I can accomplish the above. Is that correct?

Hamza

05/27/2018, 2:46 AM

operator fun invoke(args: EmbedDSLHandle.() -> Unit) {}

Hamza

05/27/2018, 2:46 AM

one more question, how do I make a function that returns nothing without throwing an Exception?

Javal

05/27/2018, 2:21 PM

I am new to kotlin, our team is thinking of utilizing kotlin for writing one of the service for our project. Is ktor a good framework to go with or there are any better alternatives?

Krizzu

05/29/2018, 8:19 AM

Hey guys, got a question about typing in Kotlin - I don’t especially know what what this typing means

Int.() -> Unit

. I get it’s a function, but this

ClassName + dot

is strange for me

Manthan

05/29/2018, 1:50 PM

I am doing Kotlin Koans exercises and it does say that it should be written. In an exercise of nullable and non nullable types.

B_P

05/31/2018, 7:36 AM

hi, I wanted to do all checks using when so my function takes one argument as Int and another one as Int, in the body of the function I do the sum of two and I wanted to use when like so "fun abc(size : Int, x : Int)" when(sum) { is bigger than size -> return false is it possible to make "is bigger than" in when condition?

Rak

05/31/2018, 9:56 AM

(Any) is not compatible with (List<Int>) or (Int)

Andreas Sinz

05/31/2018, 12:21 PM

@poohbar I'd use `var`s with a private setter and a

fun changeName(first, last)

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otakusenpai

05/31/2018, 12:29 PM

then i tried the equals(Any?) function