anyone know a good way to iterate over values of a...

# random

[sksk]

anyone know a good way to iterate over values of a Map without creating garbage ?

[orangy]

What’s wrong with mapOf(1 to "").forEach { (key, value) -> }?

[sksk]

will it create garbage ?

[sksk]

yeah i just tested it still creates lot of garbage

[orangy]

What do you mean exactly? How do you measure?

[sksk]

i'm not a pro in benchmarking and micro optimisations, but i got a memory issue in my server, there are lot of garbage created when i iterate over hashmap each tick, i tested your code like there:

fun main(args: Array<String>)
{
    val map = mapOf(1 to "")
    while (true)
        map.forEach { (key, value) -> }
}

And checked using VisualVM, lot of int[] and Collections created

[orangy]

That’s weird, it should only create entryset iterators

[orangy]

Ah, it may be unboxing ints. Try using mapOf("" to "")