Kotlin loop until

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)
}

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

Kotlin loop until

 for(i in 0 until a.size) {
       println(a[i]) /* iterates entire list */
    }

Source: tedblob.com

Kotlin loop until

for (i in 1 until 10) {      
    print(i)
}

Source: tedblob.com

While loop kotlin

var i = 1
while (i < 5) { 	// while loop
	println(i)
	i++
}					

var i = 1
do { 				// do-while loop
	println(i)
	i++
} while (i < 5)

While loop kotlin

fun displayForLoop() {
        for (i in 1..5)
            println(i)
    }

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