https://kotlinlang.org logo
Channels
Powered by
#getting-started
  • t

    thanh

    04/01/2016, 10:05 AM
    but could we get rid of if/else?
  • n

    nizajakub

    04/01/2016, 10:20 AM
    -.kt
    -.kt
  • d

    dmitry.petrov

    04/01/2016, 10:22 AM
    NB 
    Collection<T>.drop
    will copy corresponding elements to a new 
    ArrayList
    .
  • n

    nizajakub

    04/01/2016, 10:34 AM
    So I would add “, “ even after last element and then remove it using setLength on StringBuilder. But we are away from something you wanted to know.
  • t

    thanh

    04/01/2016, 10:39 AM
    Untitled.kt
    Untitled.kt
  • t

    thanh

    04/01/2016, 10:39 AM
    My solution here, get rid of if/else but still not good enougph
  • t

    thanh

    04/01/2016, 10:42 AM
    How to do nothing here 
    0 -> sb.append(“")
  • n

    nizajakub

    04/01/2016, 10:42 AM
    @thanh: As @dmitry.petrov posted, drop creates copy of ArrayList. You try remove last element delimiter from StringBuilder after you are done.
  • t

    thanh

    04/01/2016, 10:43 AM
    So we shouldn’t use 
    drop
    ?
  • t

    thanh

    04/01/2016, 10:44 AM
    I tried with 
    takeLast
    but it’s seem to be removed
  • n

    nizajakub

    04/01/2016, 10:45 AM
    -.kt
    -.kt
  • o

    orangy

    04/01/2016, 10:49 AM
    With a little of math you can do this:
    Copy code
    fun joinList(collection: List<String>): String = StringBuilder().apply {
    append("{")
    collection.forEachIndexed { index, item -> append(", ", 0, index.coerceAtMost(1) * 2).append(item) }
    append("}")
}.toString()
  • c

    cole

    04/01/2016, 6:24 PM
    Hey folks, I'm having trouble with structural vs. referential equality for sealed classes, and I'm hoping this is the right place to ask these kinds of questions.
  • c

    cole

    04/01/2016, 6:25 PM
    -.kt
    -.kt
  • y

    yole

    04/01/2016, 6:28 PM
    your equals() method needs to override the one in kotlin.Any
  • y

    yole

    04/01/2016, 6:28 PM
    override fun equals(other: Any?)
  • y

    yole

    04/01/2016, 6:29 PM
    then 
    ==
    will call it
  • c

    cole

    04/01/2016, 6:30 PM
    Ah hah, thanks! I had tried adding the override modifier, but I didn't generalize the argument type to 
    Any?
    .
  • c

    cleiter

    04/01/2016, 7:15 PM
    does kotlin have other rules to resolve overload method ambiguity than java?
  • c

    cleiter

    04/01/2016, 7:16 PM
    i'm trying to call some overloaded java method from kotlin (which works fine in java) but the kotlin compiler seems to need a hint which method to call
  • y

    yole

    04/01/2016, 7:25 PM
    the simple answer is that yes, it does
  • c

    cleiter

    04/01/2016, 7:26 PM
    that's what i figured simple smile is it documented somewhere?
  • c

    cleiter

    04/01/2016, 7:27 PM
    and what's the recommended approach? 
    overloadedMethod(foo as TypeHint)
    ?
  • y

    yole

    04/01/2016, 7:30 PM
  • y

    yole

    04/01/2016, 7:30 PM
    the recommended approach depends on the specific case
  • c

    cleiter

    04/01/2016, 7:31 PM
    alright, thanks!
  • v

    vint

    04/02/2016, 2:47 PM
    If I have this enum
    Copy code
    enum class Currency(val sign: String) {
    USD("$"),
    GBP("£"),
    THB("฿")
}
    I can use it by
    Copy code
    val currency = Currency.USD
    println(currency.sign)  // print '$'
    But what if I want to have a custom enum, how to create something like 
    Currency.customSign("*")
  • s

    surya

    04/02/2016, 2:56 PM
    guys, what is the best way to defining a constant value in kotlin? that equals with
    Copy code
    public static final
    in java
  • m

    matej

    04/02/2016, 2:59 PM
    @vint Well, you can't really do that with an Enum per se, the point of it is to have all the members enumerated at compile time, and creating one on the fly would negate this. There already exists a Currency class in Java with a factory method for getting an instance based on a three letter ISO currency code. Maybe you can look into using that?
  • v

    vint

    04/02/2016, 3:00 PM
    Actually I’m not planning to do something with currency 😛 Just want to provide an easy example of what I’m trying to do
1...228229230...1083Latest