A range is defined as an interval that has a start value and an end value. Any types which are comparable can be used to create a range, which is done using the .. operator:
val aToZ = "a".."z"
val oneToNine = 1..9
Once a range is created, the in operator can be used to test whether a given value is included in the range. This is why the types must be comparable. For a value to be included in a range, it must be greater than or equal to the start value and less than or equal to the end value:
val aToZ = "a".."z"
val isTrue = "c" in aToZ
val oneToNine = 1..9
val isFalse = 11 in oneToNine
Integer ranges such as (ints, longs, and chars) also have the ability to be used in a for loop. See the Loops section for further details.
There are further library functions to create ranges not covered by...