Hi, beginner here. `//wins - horizontal` `fun horizontalWin(letter: String, listIn: listOf<Strin...

# announcements

[ImranH]

Hi, beginner here.

//wins - horizontal
fun horizontalWin(letter: String, listIn: listOf<String>() ): boolean {
var counter = 0
for (element in listIn ) {
if (element == letter) {
counter++
}
}
if (counter == 3) return true
}

fun main(args: Array<String>) {
var row1 = listOf("X","O","_")
var checkForWin = horizontalWin("X", row1)
}

It s a bit rough and I am not sure if it makes sense, but I want to pass a list (or array) in and test it.

Thank you.

[Shawn]

next time please use triple backticks ` ``` ` to mark the beginning and end of a code block

[Shawn]

fun main() {
  println("hello world")
}

[rnpy]

also, is there a question? 🤔

[ImranH]

Ah sorry, totally missed that from my draft! apologies for the formatting too, anyway, I want to pass a list as a parameter but, I am getting 'unresolved reference' for the list parameter in the function, is it possible to pass a list/array as a parameter to a function? If so, how? thank you.

[Shawn]

ohhh, I see, just reread your message

[Shawn]

listOf() is a helper function to approximate list literals

[Shawn]

the type is List<T> (also MutableList<T> if you need write methods)

[Shawn]

fun horizontalWin(letter: String, listIn: List<String>): Boolean {
  ...
}

[Shawn]

@ImranH (in case you don’t have thread notifications enabled)

[ImranH]

Ah, thank you, I will give that a go. Apologies for the confusion again.

[ImranH]

Worked like a charm 👍

[arve]

@ImranH also, consider the following equivalent but way more consise approach

fun horizontalWin(letter: String, listIn: List<String>): Boolean {
  val matches = listIn.filter { it == letter } 
  return matches.size >= 3
}

, or taken a step further

fun horizontalWin(letter: String, listIn: List<String>) = listIn.filter { it == letter }.size >= 3

[Shawn]

I mean, I figure that’d be tangential to the goal of learning Kotlin basics

[Shawn]

you really could just do listIn.count { it == letter } >= 3

[ImranH]

Thanks guys, I will have a play with those too. Appreciate it.