Getting ready

The Kotlin standard library provides functions that allow the declaration of ranges for the integral, primitive types, such as Int, Long, and Char. To define a new range instance, we can use the rangeTo() function. For example, we can declare a range of integers from 0 to 1000 in the following way:

val range: IntRange = 0.rangeTo(1000)

The rangeTo() function has also its own special operator equivalent, .., which allows the declaration of a range with a more natural syntax:

val range: IntRange = 0..1000

Also, in order to declare a range of elements in a decreasing order, we can use the downTo() function.