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| thana |
greves: the correct way is to make sure it's initialized in the constructor... class Foo{val i: Int; constructor(){i = 2;}} |
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| greves |
thana: but that only works for 'var' not 'val', right? |
[02:34]
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| thana |
greves: nope |
[02:34]
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| thana |
it's perfectly valid to initalizes `val`s in the constrcutor(s) |
[02:35]
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| greves |
thana: I see an error "val on secondary constructor parameter is not allowed" when i try that |
[02:37]
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| thana |
greves: you may write something like `class Foo(val value: String)` but not `class Foo{ constructor(val value: String) }` |
[02:38]
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| thana |
using the primary constructor you can declare fields of the class but that's not allowed with secondar ctors |
[02:39]
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| greves |
OK, that's what I thought but it seemed you said differently |
[02:39]
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| greves |
So, in a secondary constructor I can only initialize "var" and not "val"? |
[02:39]
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| greves |
I mean, I need: class Foo(..) { constructor (x) { this.x = x } } |
[02:39]
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| thana |
so `class Foo(val value:String)` declares a field and you could do `println(Foo("Hello World").value)` |
[02:40]
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| greves |
When I am extending an android View, I need the default constructor, e.g. LinearLayout(context: Context) |
[02:40]
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| thana |
yet `class Foo(value:String)` only declares a constrcutor which expects a string parameter but `Foo("fds").value` does not exist |
[02:40]
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| greves |
I think I need to pastebin exactly what's happening because it's a bit much to type on IRC, just a sec |
[02:42]
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| thana |
yes please :) |
[02:42]
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| thana |
disclaimer: i'm doing kotlin for a week now - my answers might still be wrong or flawed at least |
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| greves |
Any pastebins for Kotlin? |
[02:44]
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| greves |
https://bpaste.net/show/6e40ba93484b |
[02:45]
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| thana |
the people here use hastebin |
[02:45]
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| thana |
so the problem is you NEED a single argument ctor? |
[02:48]
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| greves |
right |
[02:49]
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| greves |
well, it compiles, but it complains about this |
[02:49]
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| thana |
well then you have 2 options i think: either make your val mutable using var an set the value after construction or set some default value |
[02:50]
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| thana |
oh or you can use val with lateinit, yes |
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| cheeser |
lateinit requires var iirc |
[08:16]
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| cheeser |
greves: can you share your code on a pastebin somewhere? |
[08:17]
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| cheeser |
pastebin |
[08:17]
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| cheeser |
Please paste your code and any errors online. For runnable main-classes, try https://glot.io/new/java . For general code and errors, use for instance https://gist.github.com or https://www.hastebin.com |
[08:17]
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[08:25]
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| OnkelTem |
Hi all |
[08:25]
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| OnkelTem |
I'm new to Kotlin. Passing some tutorials and got some questions |
[08:26]
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| OnkelTem |
class CreatureAdapter(private val creatures: List<Creature>) : RecyclerView.Adapter<CreatureAdapter.ViewHolder>() { |
[08:26]
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| OnkelTem |
What does private here mean? It looks like a parameter to a constructor |
[08:26]
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[08:26]
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| OnkelTem |
Is it? |
[08:26]
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| cheeser |
it means it's a private property on that class. |
[08:26]
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| thana |
it's both: declararing a parameter for the constructor as well as declaring a property of that class (because of the val) |
[08:27]
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| OnkelTem |
But is it used by the constror too? I mean is it a parameter? |
[08:27]
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| OnkelTem |
Ah, I see |
[08:28]
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| OnkelTem |
Pretty optimal then :) |
[08:28]
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| thana |
yep very handy |
[08:28]
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| cheeser |
without var/val, it's just a ctor parameter. with either, it becomes a property. private means there is no access to it outside the class. |
[08:28]
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| OnkelTem |
And about what it extends: "RecyclerView.Adapter<CreatureAdapter.ViewHolder>()" - it looks like an invocation. Is it? Is it something returning a class or... ? |
[08:29]
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| OnkelTem |
cheeser: thanks |
[08:29]
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| cheeser |
the () is necessary because it's a class and you have to invoke a ctor on a parent class. |
[08:29]
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| OnkelTem |
cheeser: what if my derived class didn't have the primary constructor? Had I "call" the baseclass's ctor the same way in this case? |
[08:37]
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| OnkelTem |
I mean: "class CreatureAdapter : RecyclerView.Adapter<CreatureAdapter.ViewHolder>() {" |
[08:37]
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| cheeser |
every class has a primary constructor |
[08:37]
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| cheeser |
if you don't write one, the compiler generates a default, no arg constructor |
[08:38]
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| greves |
cheeser: I did I think earlier |
[08:38]
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| greves |
https://bpaste.net/show/6e40ba93484b |
[08:39]
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| greves |
my "Foo" class currently has a lot going on in the primary constructor, but it extends LinearLayout. Probably I should move all of the stuff out of primary constructor and init{}? |
[08:40]
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| cheeser |
you need another constructor for framework to use your type |
[08:41]
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| cheeser |
x will have to be: var x: Something? most likely |
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| greves |
Ok, got it |
[08:53]
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| greves |
thanks |
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| thana |
coroutines and a js target seem to be a problem yet :( |
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| thana |
the coroutines i create dont seem to even get executed... really sad :( |
[10:49]
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| thana |
does anybody here have expirience with co routines on js? |
[10:50]
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| cheeser |
not me |
[10:51]
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| thana |
cheeser: do you know if there is a channel/list/slack/whatever better suited to place kotlin/js related questions? |
[11:15]
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| cheeser |
there's #coroutins on the kotlin slack |
[11:17]
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| thana |
cool! i'll have a look, thanks |
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| thana |
too bad. don't get an invite |
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[03:36]
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| ovalseven8 |
Beginner: Should I start with Gradle or Maven? |
[03:36]
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| jdlee |
i prefer maven |
[03:40]
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| jdlee |
¯\_(?)_/¯ |
[03:40]
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| jdlee |
YMMV :P |
[03:40]
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| Addax |
jdlee: but answer the question! He's asking if he should use either maven or gradle, and the clear answer, assuming he wants to build a project, esp with a JVM, is "yes." Both of those are far better than the alternatives like make, cmake, ant, buildr, sbt, etc etc etc |
[03:43]
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| jdlee |
haha |
[03:44]
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| jdlee |
ovalseven8: kinda depends on where you're learning. if you're in Androidland, i'd start with gradle, as that's what the official docs show. if you're on Joe Blow's Blog, do as the Romans do. :) |
[03:47]
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| ovalseven8 |
jdlee, I don't do Android programming |
[03:48]
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| jdlee nods |
[03:49]
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| Addax |
do you program in a JVM language? |
[03:49]
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| ovalseven8 |
Addax, I want to start with Kotlin |
[03:49]
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| jdlee |
personally, i'd start with Maven. IMO, the ecosystem (and the tool?) seems to be more mature |
[03:49]
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| Addax |
well, are you targeting the JVM? |
[03:49]
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| ovalseven8 |
Addax, Yeah, Kotlin/Native is still beta also |
[03:50]
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| ovalseven8 |
But out of interest: What's the build tool for Kotlin/Native? |
[03:50]
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| Addax |
probably gradle or maven! |
[03:50]
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| jdlee |
haha |
[03:51]
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| ovalseven8 |
Cool |
[03:51]
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| Addax |
From the website on kotlin/native: https://kotlinlang.org/docs/tutorials/native/gradle-for-kotlin-native.html |
[03:51]
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| Addax |
Addax's title: "Gradle for Kotlin/Native - Kotlin Programming Language" |
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