Collections: Lists and MutableLists

 

// File:            Main.kt
// Programmer:      Engineer Nolverto Urias Obeso
// Creation Date:   06/21/2023
// Email:           nolvertou@gmail.com
// Description:     Using Collections (lists and mutable lists)

fun main() {
    val testList: List<Int> = listOf(11,12,13,14,15,16,17,18,19,20)
    println(testList)                        // Output: [11, 12, 13, 14, 15, 16, 17, 18, 19, 20]

    println(reverseList(testList))          // Output: [20, 19, 18, 17, 16, 15, 14, 13, 12, 11]
    println(reverseListAgain(testList))     // Output: [20, 19, 18, 17, 16, 15, 14, 13, 12, 11]
    println(testList.reversed())            // Output: [20, 19, 18, 17, 16, 15, 14, 13, 12, 11]
}

fun reverseList(list: List<Int>): List<Int>{
    val result: MutableList<Int> = mutableListOf<Int>()
    for (i in list.indices){
        result.add(list[list.size-i-1])
    }
    return result
}

fun reverseListAgain(list: List<Int>): List<Int>{
    val result: MutableList<Int> = mutableListOf<Int>()
    for(i in list.size - 1 downTo  0){
        result.add(list[i])
    }
    return result
}