Hands-On Object-Oriented Programming with Kotlin

The until function

If we want to exclude the last element of the range, we can use the until function:

val execRange1 = 1.until(10)println(execRange1) 

The until function can be declared as follows:

val execRange2 = 1 until 10println(execRange2)

When demonstrating a range of character types in Declaring a range section, we created a complete alphabet using two dots. We can also do this using the to operator:

val alphabets2 = 'A' to 'Z'println(alphabets2)

Another way to do this is by using ASCII code. 65 is the ASCII code for a capital A, while 90 is the ASCII code for a capital Z:

val alphabets3 = 'A'.until(91.toChar())println(alphabets3)

Both ranges will display the same result—a complete alphabet in capital letters.