Error on converting js function to kotlin

Question

I found a solution for prioritize an items list accoding by user preference in javascript at link: http://jsfiddle.net/fq3sy/1/

I'm trying to pass it to kotlin , but the list items sometimes are coming with same values for user chooses

My Kotlin code currently:

var arr = arrayOf("finish homework", "finish chores", "go shopping")
insertionSort(arr)

fun promptInput(str1: String, str2: String): String{
    println(str1+ " or " + str2 + "?");
    return str1
}

fun insertionSort(arr: Array<String>){
    println("arr size")
    //alert(insertionSort("What needs to be done first", ["finish homework", "finish chores", "go shopping"]));
    var len = arr.size
    var i = -1
    var j: Int? = null
    var tmp: String?

    while (len!=0) {
        tmp = arr[++i];
        j = i
        while (j!=0 && (promptInput(arr[j], tmp) == arr[j])) {
            arr[j + 1] = arr[j];
            j--
        }
        arr[j + 1] = tmp;
        len--
    }
    return arr.reverse();
}

It is printing in kotlin:

I/System.out: arr size
I/System.out: finish homework or finish homework?
I/System.out: finish homework or finish homework?

But it should print:

I/System.out: arr size
I/System.out: finish homework or finish chores?
I/System.out: finish homework or go shopping?
I/System.out: finish chores or go shopping?

with the following order: finish homework,finish chores,go shopping

What I'm doing wrong in this conversion?

Answer 1

Kotlin as of strict type-system would not allow Ints to be 0 or anything as false or true. If you want Boolean, you can use j-- != 0 .

You can do your work as follows:

fun main() {
    val arr = arrayOf("finish homework", "finish chores", "go shopping")
    val result = insertionSort("What needs to be done first", arr)
    println(result.toList())
}

fun promptInput(comparison: String, str1: String, str2: String): String {
    println("$comparison: $str1 or $str2?");
    return readLine()!!
}

fun insertionSort(comparison: String, arr: Array<String>): Array<String> {
    println("arr size: ${arr.size}")
    var len = arr.size
    var i = -1
    var j: Int
    var tmp: String

    while (len-- != 0) {
        tmp = arr[++i];
        j = i
        while (j-- != 0 && (promptInput(comparison, arr[j], tmp) == arr[j])) {
            arr[j + 1] = arr[j];
        }
        arr[j + 1] = tmp
    }

    return arr.apply { reverse() }
}

With following ouput/input cases:

arr size: 3
What needs to be done first: finish homework or finish chores?
>> finish homework
What needs to be done first: finish homework or go shopping?
>> finish homework
What needs to be done first: finish chores or go shopping?
>> finish chores
[finish homework, finish chores, go shopping]