Learning Kotlin – Part 5 - loops

This time we deal with loops

Table of Contents

Loops

Kotlin has two types of loops: for and while.

for(x in 1..10){
    println("Loop: $x")
}

We can count backwards as well

for (x in 10 downTo 1) { 
     println("Loop: $x") 
}

var i = 10 
while(i > 0) { 
    println("$i") i-- 
}

for(x in 1..20){ 
    if(x % 2 == 0) { 
        continue 
    } 
    println("Odd: $x") 
    if(x == 15) 
        break 
}

val myArray: Array<Int> = arrayOf(3,6,9) 
for(i in myArray.indices){ 
    println("Mult3 : ${myArray[i]}") 
}

lines.forEach { 
    println(it) 
}

When you are familiar with Python’s enumerate fucntion You will appreciate the withIndex-function:

for((index, value) in myArray.withIndex()) { 
    println("Index : $index Value : $value") 
}

there is also a more kotlinic version of it

myList.forEachIndexed { 
    i, element -> println(i) println(element) 
}