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  • a

    agomez

    08/15/2017, 8:08 PM
    in other cases where you need lazily initialised `val`s you can use 
    by lazy
  • s

    skennedy

    08/15/2017, 8:09 PM
    Is this not a constant value?
  • k

    karelpeeters

    08/15/2017, 8:12 PM
    Submit an issue 🙂
  • g

    gabrielfv

    08/15/2017, 8:32 PM
    I think the linter doesn't recognize the conditional as a constant expression (because it isn't, after all). But in this context, it makes sense
  • n

    nkiesel

    08/15/2017, 8:42 PM
    "constructor injection": yes, just wanted to keep code structure similar for now. But really what I'm after is to be able to express "assigned exactly once" combined with "assigned behind the scenes before first usage". Thus, I really want 
    lateinit val
    . I also suspect that nearly all 
    lateinit var
    are (and should be) only assigned once anyway. So would be cool if the compiler could enforce that.
  • a

    agomez

    08/15/2017, 8:45 PM
    val myValue: Type by lazy { /* initialization code */ }
  • a

    agomez

    08/15/2017, 8:45 PM
    that's how you initialized it only once before first usage
  • p

    poohbar

    08/15/2017, 8:57 PM
    so why is 
    lateinit
    not only allowed on `val`s? It would make more sense for the reasons described by Norbert
  • k

    karelpeeters

    08/15/2017, 8:58 PM
    The compiler cannot enforce that: the places where you use 
    lateinit
    are cases where the compiler couldn't deduce that it would even be initialized at all, so how would it know it's only initialized once?
  • v

    v79

    08/15/2017, 9:12 PM
    Glad I'm not the only one who wishes for 
    lateinit val
    ! But I've been persuaded it's not possible.
  • d

    dumptruckman

    08/15/2017, 9:12 PM
    Is there a way to show warnings on Java APIs that throw checked exceptions?
  • n

    nkiesel

    08/15/2017, 9:57 PM
    "compiler cannot enforce": the compiler also cannot enforce that the lateinit really happens and instead throws an exception during runtime. And I think the DI tools anyway do not assign using normal assignment, thus they should not care about 
    var
    vs. 
    val
    .
  • n

    nkiesel

    08/15/2017, 9:58 PM
    the 
    by lazy
    does not work for DI because it requires the initialization code / value in the class
  • a

    agomez

    08/15/2017, 10:05 PM
    in other cases where you need lazily initialised `val`s you can use 
    by lazy
    Posted in #general
  • u

    user

    08/16/2017, 2:15 AM
    @gildor commented on @skennedy’s file

    https://kotlinlang.slack.com/files/U5Z66QKBK/F6P2H5QRJ/screen_shot_2017-08-15_at_13.08.36.png▾

    : Kotlin compiler doesn’t support such dynamic syntax for constants
  • u

    user

    08/16/2017, 2:16 AM
    @gildor commented on @skennedy’s file

    https://kotlinlang.slack.com/files/U5Z66QKBK/F6P2H5QRJ/screen_shot_2017-08-15_at_13.08.36.png▾

    : I remember issue on YT or some discussion of Kotlin forum about const improvement
  • u

    user

    08/16/2017, 2:16 AM
    @skennedy commented on @skennedy’s file

    https://kotlinlang.slack.com/files/U5Z66QKBK/F6P2H5QRJ/screen_shot_2017-08-15_at_13.08.36.png▾

    : yes, i filed an issue
  • m

    michaelzinn

    08/16/2017, 10:56 AM
    I declared a retrofit call parameter as List<List<String>> but it doesn’t work because 
    java.lang.IllegalArgumentException: Parameter type must not include a type variable or wildcard: java.util.List<? extends java.util.List<java.lang.String>>
    . Why does it turn into 
    ? extends ...
    and what’s the best solution here?
  • k

    karelpeeters

    08/16/2017, 11:00 AM
    Because Kotlin's immutable list is declared as 
    interface List<out E>
    and that is compiled to a wildcard. I think you can use 
    MutableList
    , since that doesn't have a wildcard.
  • k

    karelpeeters

    08/16/2017, 11:01 AM
    See this for a more in-depth explanation about `out`: https://kotlinlang.org/docs/reference/generics.html.
  • t

    tieskedh

    08/16/2017, 12:42 PM
    I've 2 questions... I can't use the kotlin-plugin, because I get errors all the time and it only recognizes the java-methods. my questions: 1. Does Kotlin filter out duplicated errors, cause the "Report to JetBrains is disabled". 2. Can I downgrade kotlin-plugin, without loosing the patches, as reported on https://stackoverflow.com/questions/35649488/how-to-downgrade-kotlin-in-intellij-15 So I can use the plugin again?
  • k

    karelpeeters

    08/16/2017, 1:36 PM
    It does indeed always include the 
    jre7
    one, I don't know what happens if you exclude it.
  • m

    mikehearn

    08/16/2017, 3:55 PM
    is there a reason that componentN() methods aren't marked as synthetic?
  • t

    trevjones

    08/16/2017, 4:14 PM
    Can’t you manually write your own on non data classes to enable destructuring? I would think that would be a reason? spitball
  • g

    gildor

    08/16/2017, 4:24 PM
    yes, just add component1() - componentN() methods to your class https://kotlinlang.org/docs/reference/multi-declarations.html
  • m

    mikehearn

    08/16/2017, 4:29 PM
    but when they're auto-generated by data classes, they are in fact synthetic (and should not appear in javadocs, java auto completes, etc)
    ➕ 1
  • k

    karelpeeters

    08/16/2017, 8:12 PM
    Does there happen to be a method that returns whether a list contains an item that matches a given predicate? Basically something like this: 
    list.find{it > 5} != null
    would be 
    list.containsMatch{it > 5}
    .
  • v

    vmironov

    08/16/2017, 8:14 PM
    list.any { it > 5 }
    👍 1
  • l

    lab

    08/16/2017, 8:45 PM
    Hi all, I'm making a trie for text autocompletion,
  • l

    lab

    08/16/2017, 8:46 PM
    The output is a HashSet<Int> of indexes in the original List<String>
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