Android Development with Kotlin

Ranges

A range is a way to define a sequence of values. It is denoted by the first and last value in the sequence. We can use ranges to store weights, temperatures, time, and age. A range is defined using double dot notation (under the hood, a range uses the rangeTo operator):

    val intRange = 1..4 // 1 
    val charRange= 'b'..'g' // 2 

1. Inferred type is IntRange (equivalent of i >= 1 && i <= 4).
2. Inferred type is CharRange (equivalent of letters from 'b' to 'g').

Notice that we are using single quotes to define the character range.

The Int, Long, and Char type ranges can be used to iterate over next values in the for... each loop:

    for (i in 1..5) print(i) // Prints: 1234 
    for (i in 'b'..'g') print(i) // Prints: bcdefg 

Ranges can be used to check ...