Check out example codes for "kotlin loop". It will help you in understanding the concepts better.

Code Example 1

``````var bubbles = 0
while (bubbles < 50) {
bubbles++
}
println("\$bubbles bubbles in the water\n")

do {
bubbles--
} while (bubbles > 50)
println("\$bubbles bubbles in the water\n")

repeat(2) {
println("A fish is swimming")
}
-> 50 bubbles in the water
49 bubbles in the water
A fish is swimmingA fish is swimming``````

Code Example 2

``````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``````

Code Example 3

``````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``````

Code Example 4

``````val names = listOf("Anne", "Peter", "Jeff")
for (name in names) {
println(name)
}``````

Code Example 5

``````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)
}``````

Code Example 6

``````val names = listOf("Jack", "John", "Tim")
for(name in names){
println(name)
}``````

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