Learning Kotlin – Part 3

After Learning Kotlin  –  Part 1 and Learning Kotlin – Part 2 we will now dive into the ranges.

One nice little feature is the .. syntax: you can generate an IntRange object just by specifying the start and the end element:

val oneTo10 = 1..10

You can even use values for the start and end data

val one = 1
val ten = 10
val oneToTen = one..ten

Compared to the range function in Python the last element is included, which is less error prone.

You can use the  rangeTo function as well:

val twoTo20 = 2.rangeTo(20)

It works as well with characters

val alpha = "A".."Z"

The syntax for a reversed range looks like this

 val tenTo1 = 10.downTo(1)

You can get a ‘subset’ of a range with the step function

val rng = oneTo10.step(3)

You can reverse an existing range


So, there are many possibilities to make ranges in Kotlin! Yeah!