Arrays in Kotlin

 package com.example.my_kotlin_practice

fun main(args: Array<String>)
{
    val fruits = arrayOf("Apple","Mango","Banana","Orange")
    val fruits1 = arrayOf<String>("Apple","Mango","Banana","Orange")
    val num = intArrayOf(1,2,3,4)
    println(num.contentToString())
    println(fruits.contentToString())
    println(fruits1.contentToString())
    println(fruits[0])
    println(fruits1[2])
    println(fruits1.get(0))
    println(fruits1.get(2))
    fruits1.set(2,"Guava")
    println(fruits1.get(2))

    println("Size of the fruits1 array is : " + fruits1.size)

    for(item in fruits1) {
        println(item)
    }
    if("Mango" in fruits1) {
        println("Mango exists in fruits1 array")
    } else {
        println("Mango doesn't exists in fruits1 array")
    }
    println("Below is the usage of distinct() member function :")
    val fruits2 = arrayOf<String>("Apple","Mango","Banana","Orange","Apple")
    for(item in fruits2.distinct()) {
        println(item)
    }
    println("Below is the usage of drop() member function :")
    for(item in fruits2.drop(2)) {
        println(item)
    }
    println("Below is the usage of dropLast() member function :")
    for(item in fruits2.dropLast(2)) {
        println(item)
    }

    val fruits3 = arrayOf<String>()
    println("Array is empty : " + fruits3.isEmpty())

    val fruits4 = charArrayOf('a','b','c','d')
    println("Character array is : ${fruits4.contentToString()}")

    val fruits5 = doubleArrayOf(1.1,10.10,20.5,45.21)
    println("Array of type double is : ${fruits5.contentToString()}")

    val array = Array(5) { i -> i }
    val iterator = array.iterator()
//    println("Below output is performed using 'while' loop :")
//    println("The elements in the array are :")
//    while(iterator.hasNext()) {
//        println(iterator.next())
//    }
    println("Below output is performed using 'for' loop :")
    for(element in iterator) {
        println(element)
    }
    val iterator2 = fruits1.iterator()
    println("The elements in the array 'fruits2' is :")
//    while(iterator2.hasNext()) {
//        println(iterator2.next())
//    }
    println("Below output is performed using 'for' loop :")
    for(element in iterator2) {
        println(element)
    }

    val fruit = Array<String>(4) { "" }
    fruit[0] = "Apple"
    fruit[1] = "Banana"
    fruit[2] = "Orange"
    fruit[3] = "Pineapple"
    println(fruit.contentToString())

    val fruit1 = Array<String>(3) { index ->
        when (index) {
            0 -> "Android"
            1 -> "iOS"
            2 -> "Flutter"
            else -> "Nothing"
        }
    }
    println(fruit1.contentToString())
    val number = Array<Int>(5) { index -> index + 1 }
    println(number.contentToString())

    val number1 = intArrayOf(10,20,30,40,50)
    println(number1.contentToString())
    val number2 = doubleArrayOf(1.1,10.10,20.5,22.45)
    println(number2.contentToString())
    val charValue = charArrayOf('a','b','c','d','e')
    println(charValue.contentToString())

    val name = arrayOfNulls<String>(4)
    name[0] = "ABC"
    name[1] = "Prakash"
    name[2] = "Ganesh"
    name[3] = "Elephant"
    println(name.contentToString())

//    val name1 = Array(3) {
//        println("Enter name : ")
//        readln()
//    }
//    println(name1.contentToString())

    var fd = emptyArray<String>()
    fd += "Android"
    fd += "PHP"
    fd += "Flutter"
    fd += "Kotlin"
    fd += "Java"
    println(fd.contentToString())

    val course : Array<String> = arrayOf("Android","Flutter","IOS","Kotlin","Dart","Java")
    course.forEach{ println(it) }

    val matrix = arrayOf(
        arrayOf(10,20,30,40),
        arrayOf(50,60,70,80),
        arrayOf(90,100,110,120),
        arrayOf(130,140,150,160)
    )
    println(matrix[0][0])
    println(matrix[1][2])
    println(matrix[2][3])
    for(row in matrix) {
        for(value in row) {
            print(value)
        }
        println()
    }

    val array1 = Array(5) { init -> 1 }
    val len = array1.size
    println("The number of elements in the array is : $len")
    println("The elements in the array are : ")
    for(i in 0 until len) {
        println(array[i])
    }

    val array2 = Array(5) { index -> index * 2 }
    println("Array contents : ${array2.joinToString()}")

    val array3 = Array(10) { i -> i }
    val len2 = array3.size
    println("The number of elements in the array is : $len2")
    println("The elements in the array are : ")
    for(i in 0 until len2) {
        println(array3[i])
    }

    val array4 = Array(2) { init -> "Sample String" }
    val len3 = array4.size
    println("The number of elements in the array is : $len3")
    println("The elements in the array are : ")
    for(i in 0 until len3) {
        println(array4[i])
    }

    val number3 = Array(5) { index -> index + 1 }
    println(number3.contentToString())


}

OUTPUT:

[1, 2, 3, 4]
[Apple, Mango, Banana, Orange]
[Apple, Mango, Banana, Orange]
Apple
Banana
Apple
Banana
Guava
Size of the fruits1 array is : 4
Apple
Mango
Guava
Orange
Mango exists in fruits1 array
Below is the usage of distinct() member function :
Apple
Mango
Banana
Orange
Below is the usage of drop() member function :
Banana
Orange
Apple
Below is the usage of dropLast() member function :
Apple
Mango
Banana
Array is empty : true
Character array is : [a, b, c, d]
Array of type double is : [1.1, 10.1, 20.5, 45.21]
Below output is performed using 'for' loop :
0
1
2
3
4
The elements in the array 'fruits2' is :
Below output is performed using 'for' loop :
Apple
Mango
Guava
Orange
[Apple, Banana, Orange, Pineapple]
[Android, iOS, Flutter]
[1, 2, 3, 4, 5]
[10, 20, 30, 40, 50]
[1.1, 10.1, 20.5, 22.45]
[a, b, c, d, e]
[ABC, Prakash, Ganesh, Elephant]
[Android, PHP, Flutter, Kotlin, Java]
Android
Flutter
IOS
Kotlin
Dart
Java
10
70
120
10203040
50607080
90100110120
130140150160
The number of elements in the array is : 5
The elements in the array are : 
0
1
2
3
4
Array contents : 0, 2, 4, 6, 8
The number of elements in the array is : 10
The elements in the array are : 
0
1
2
3
4
5
6
7
8
9
The number of elements in the array is : 2
The elements in the array are : 
Sample String
Sample String
[1, 2, 3, 4, 5]

Process finished with exit code 0