Телеграмм чат группы kotlin

Size: a a a

Kotlin Start

620 membersпожаловаться на группу

2019 September 29

Matthew Good in Kotlin Start

Denys

Unfortunately I'm not familiar with trampolines. I guess we need functional programming expert here.

источник

11:53пожаловаться

Matthew Good in Kotlin Start

for example, this is state recursive

fun digit() {
    // create a state machine that accepts integer input in the form of a string
    val FiniteStateMachine = StateMachines().FiniteStateMachine<String>()
    FiniteStateMachine.state.add(FiniteStateMachine.state.defaultState()) {
        when (FiniteStateMachine.getInput()) {
            "0", "1", "2", "3", "4", "5", "6", "7", "8", "9" -> {
                println("is digit")

it.stateList[0].action()

            }
            null -> println("EOF")
            else -> println("is not digit")
        }
    }
    FiniteStateMachine.input = "12345678964457647".toStack()
    FiniteStateMachine.executeDefault()
}

in which given the input, would have an end recursion depth of 17

источник

11:53пожаловаться

ᵛ

ᵛᵉⁿᵈᵉˡⁱᵉᵘ in Kotlin Start

Denys

data.chunked(3):

fun main() {
    (0..10)
        .map { it }
        .chunked(3)
        .let(::println)
}

спасибо большое за подсказки

источник

11:57пожаловаться

Matthew Good in Kotlin Start

like this o.o https://stackoverflow.com/questions/35714683/kotlin-tail-recursion-for-mutually-recursive-functions

Stack Overflow

Kotlin: Tail recursion for mutually recursive functions

Suppose I write code like this:

tailrec fun odd(n: Int): Boolean =
if (n == 0) false
else even(n - 1)

tailrec fun even(n: Int): Boolean =
if (n == 0) true
else odd...

источник

12:08пожаловаться

Matthew Good in Kotlin Start

(not sure if it also counts for dynamically added functions such as in my case of a lamda list)

источник

12:09пожаловаться

Matthew Good in Kotlin Start

https://pl.kotl.in/npFEmt2tx oh ;-;

Exception in thread "main" java.security.AccessControlException: Access control exception due to security reasons in web playground: 
 access denied ("java.util.PropertyPermission" "kotlin.ignore.old.metadata" "read")
 at FileKt.main (File.kt:-1)

источник

12:12пожаловаться

Matthew Good in Kotlin Start

is thare any way around this?

источник

12:12пожаловаться

Ruslan Ibragimov in Kotlin Start

Matthew Good

https://pl.kotl.in/npFEmt2tx oh ;-;

Exception in thread "main" java.security.AccessControlException: Access control exception due to security reasons in web playground: 
 access denied ("java.util.PropertyPermission" "kotlin.ignore.old.metadata" "read")
 at FileKt.main (File.kt:-1)

Works for me:

источник

12:23пожаловаться

Matthew Good in Kotlin Start

Ruslan Ibragimov

Works for me:

that isnt the link i sent o.o

источник

12:32пожаловаться

Ruslan Ibragimov in Kotlin Start

Your code takes more than 10s, use local machine for development

источник

12:36пожаловаться

Matthew Good in Kotlin Start

источник

12:37пожаловаться

Ruslan Ibragimov in Kotlin Start

Yes, because this is what you trampoline function do, until you pass null as first argument

источник

12:45пожаловаться

Ruslan Ibragimov in Kotlin Start

Try to think about your code, try to debug it in IDEA, before asking questions

источник

12:46пожаловаться

Matthew Good in Kotlin Start

@HeapyHop would this be a correct Trampoline implementation? https://pl.kotl.in/s8_IIXPUz as it appears to work as it hasnt thrown a stack overflow error yet

источник

13:27пожаловаться

Matthew Good in Kotlin Start

as its currently on ~933000000

источник

13:41пожаловаться

Ruslan Ibragimov in Kotlin Start

Matthew Good

@HeapyHop would this be a correct Trampoline implementation? https://pl.kotl.in/s8_IIXPUz as it appears to work as it hasnt thrown a stack overflow error yet

You take 13 mins, to undestand that you send incorrect link :) Yes, looks better

источник

13:41пожаловаться

Matthew Good in Kotlin Start

Ruslan Ibragimov

You take 13 mins, to undestand that you send incorrect link :) Yes, looks better

источник

13:42пожаловаться

Matthew Good in Kotlin Start

odd: n: 924642246
even: n: 924642245
odd: n: 924642244
even: n: 924642243

Process finished with exit code 130 (interrupted by signal 2: SIGINT)

источник

13:42пожаловаться

Matthew Good in Kotlin Start

i assume most kotlin programs would stack overflow well before reaching this recursion "depth" right? eg around 75357756 or so nested function calls, which means the trampoline works right?

источник

13:44пожаловаться

Ruslan Ibragimov in Kotlin Start

Matthew Good

i assume most kotlin programs would stack overflow well before reaching this recursion "depth" right? eg around 75357756 or so nested function calls, which means the trampoline works right?

Correct

источник

13:47пожаловаться