CODEWITHSUNDEEP
listkotlin
AlexTheNeko
AlexTheNeko

Reputation: 1

Display objects of a list randomly but only once per object in Kotlin?

Sorry if this is super basic, I'm just getting started with programming in general.

So I have this list, I've managed to display an object from it randomly when the user clicks on a button.

Here is the code that does this:


val listOfElement = listOf<String>(
"test", "test2", "test 3")

fun generateElement (view: View) {

tvDisplay.text = listOfElement.random()
}

It works fine but the problem is that an object (e.g "test3") can be displayed twice before it goes through the rest of the list.

So basically I'd like to:

Thanks again and sorry if this not appropriate - it's my first time on stackoverflow!

Upvotes: 0

Views: 110

Answers (1)

Francesc
Francesc

Reputation: 29320

You can make a copy of your list and them remove the random element, then repopulate the list when it's empty:

val listOfElement = listOf<String>(
    "test", "test2", "test 3")

val copy = mutableListOf<String>()

fun generateElement (view: View) {
    if (copy.isEmpty()) {
        copy.addAll(listOfElement)
    }
    val random = copy.random()
    copy.remove(random)
    tvDisplay.text = random
}

Upvotes: 1

Related Questions