kotlin for loop code example

Example 1: kotlin for

for (i in 1..5) print(i) 			// "12345"
for (i in 5 downTo 1) print(i) 		// "54321"
for (i in 0 until 5) { 				// "01234"
     println(i)
}
for(i in 0 until list.size()){
    println(i)
}

Example 2: kotlin loop

for (i in 1..5) print(i)
-> 12345

for (i in 5 downTo 1) print(i)
-> 54321

for (i in 3..6 step 2) print(i)
-> 35

for (i in 'd'..'g') print (i)
-> defg

Example 3: for loop kotlin

val array = arrayOf(1, 3, 9)
for (item in array) {
    //loops items
}
for (index in 0..array.size - 1) {
	//loops all indices
}
for (index in 0 untill array.size) {
    //loops all indices
}
for (index in array.indices) {
    //loops all indices (performs just as well as two examples above)
}

Example 4: Kotlin when

val x = 3
when(x) {
    3 -> println("yes")
    8 -> println("no")
    else -> println("maybe")
}
// when can also be used as an expression!
val y = when(x) {
    3 -> "yes"
    8 -> "no"
    else -> "maybe"
}
println(y) // "yes"

Example 5: kotlin for loop

val list = listOf("A", "B", "C")
for (element in list) {
 println(element)
}

Example 6: kotlin loop

val school = arrayOf("shark", "salmon", "minnow")
for (element in school) {
    print(element + " ")
}
-> shark salmon minnow

for ((index, element) in school.withIndex()) {
    println("Item at $index is $element\n")
}
-> Item at 0 is shark
Item at 1 is salmon
Item at 2 is minnow