Creating exclusive ranges in kotlin

Question

I am just starting with Kotlin. I want to create range from 1 to n where n is excluded. I found out that Kotlin has ranges and I can use them as follows

1..n

but this is an inclusive range which includes 1 and n. How do I create exclusive ranges.

Answer 1

You can use the until function in the Kotlin stdlib:

for (i in 1 until 5) {     println(i) } 

Which will print:

1 2 3 4 

Answer 2

Not sure if this is the best way to do it but you can define an Int extension which creates an IntRange from (lower bound +1) to (upper bound - 1).

fun Int.exclusiveRangeTo(other: Int): IntRange = IntRange(this + 1, other - 1) 

And then use it in this way:

for (i in 1 exclusiveRangeTo n) { //... } 

Here you can find more details about how ranges work.