@abu We have plans to support such type inference in 1.1. Also you can track progress here: https://youtrack.jetbrains.com/issue/KT-4240

great! ty. want this feature simple smile

Kotlin have pretty syntax for typing funs like:

Function1<A, B>

==

(A) -> B

. Are there any shorthands for

Pair<A,B>

?

Also how can I express

interface Function<A>

in a "pretty" notation?

@abu: to create a pair, use the

to

function like

1 to "a"

, see https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/to.html

if you where to develop a new js app, would you use kotlin or typescript? (eg. how experimental is the js compile in kotlin?)

a jetbraind browser plugin was written in kotlin and has been in production for about a year, so i think pretty stable

@Andreas Sinz: Thanks. But what about type specifications? Can I somehow rewrite

fun myfunc(..): Pair<A,B> = ...

in a prettier way?

like

fun myfunc(..): (A,B) = ...

?

@abu There is no such syntax in kotlin. Special syntax exists only for functions because they have special meaning for compiler. Pair is just usual type.

@voddan: thanks for the input

@voddan: I have some property (Android)

var asset: Asset = Asset()  // UNDEFINED BEHAVIOR!!! see #onViewCreated!
        get() = field
        set(value) {
            ...
        }

And I initialise it after fragment is created:

asset = cache.assets.best()!!   // Choosing the best asset! Don't remove this string

I do it this way cause I want have

asset

parameter of fragment. When it’s changed - UI is also changed. Also you can get current

asset

if you want.

Initially, I just want to pick the best of all available assets and have not-null property. I just want feel safety with help of compiler. But I need to initialise my property later (when Android framework will give me a context).

One possible solution is to do all dirty work in onViewCreated. Just move functions and properties from scope of class to scope of onViewCreated.

But I have problem. I also had another function

override fun onNetMessage(action: String?, message: Any?)

. When system receives network packages - that function will be called.

So if I need to have an access to

asset

- I need to use class-scope for this variable.

@artem_zin has left the channel

@egslava: so this property must change while your program runs, correct?

could you please post the entire class "as is" in a snippet ?

i am interested in how you use the property

@bazted has left the channel

@voddan: http://pastebin.com/iQMSbTL3

@voddan: sorry, I’m a bit late bowtie

@egslava: no problem , nobody sits on the internet whole day 😄

I sow the code, pretty cool

I see your problem there

I am preparing a new web app and so far I considered using play framework with scala. But Kotlin has caugt my interest and I was wondering what options there are for using Kotlin in a webapp today?

@voddan: wow! simple smile Thanks! simple smile So what do you think?

@egslava: a classic workaround for that would be to have a "backing property":

private var _asset: Asset? = null
var asset: Asset
    get() = _asset ?: throw Exception()
...

@voddan: wow, yeah simple smile