is there a cool new flashy kotlin way to iterate o...

# getting-started

[oday]

is there a cool new flashy kotlin way to iterate over 2 lists of the same size in Kotlin?

[kingsley]

zip?

[oday]

zip…ok I’ll look into it, makes them into 1 list that you can iterate over?

[menegatti]

map elements at the same index to a pair and then you can iterate as usual

[oday]

got it

[oday]

but how do I pick first or second

[oday]

to access the properties of the objects? isnt first referring to the first of the pair and second to the second>

[menegatti]

a pair has first and second attributes

[oday]

yes

[kingsley]

Or you could destructure. Something like:

val a = listOf("a", "b")
    val b = listOf("c", "d")
    a.zip(b).forEach { (first, second) -> print(first + second) }

Whatever works for you man

[oday]

I add “Pipe” object which has these params, and i use those pipes to draw them with a drawRect

allPipes.forEach {
      canvas?.drawRect(it.first.distanceX, it.distanceY, it.width,
          it.height, painter)
    }

[oday]

do I have to have now two drawRects? one including `first`‘s params and the other including `second`‘s params?

[menegatti]

I don't follow

[oday]

it’s a class Pipe which has right left top bottom params, i fill up an array of Pipes and then draw them

[oday]

I want to draw bottom pipes and top pipes, so 2 arrays joined into the allPipes array

[oday]

i iterate over it and feed the objects to drawRect, to be drawn

[oday]

if I always use first in the loop, I will always get the first of each pair, not both, i want both, so I use two drawRect calls

[oday]

yep, it works

[menegatti]

out of curiosity, why do you have one list for bottom and another for top pipes?

[oday]

hmm well to make them bottom, their param values have to change

[oday]

yea i can do a even/odd check inside 1 loop and change the params depending on what I want

[oday]

lol, yea that’s better