Enum classes

An enumerated type (enum) is a data type consisting of a set of named values. To define an enum type, we need to add the enum keyword to the class declaration header:

    enum class Color { 
        RED, 
        ORANGE, 
        BLUE, 
        GRAY, 
        VIOLET 
    } 
 
    val favouriteColor = Color.BLUE 

To parse a string into enum, use the valueOf method (like in Java):

    val selectedColor = Color.valueOf("BLUE") 
    println(selectedColor == Color.BLUE) // prints: true 

Or you can use the Kotlin helper method:

    val selectedColor = enumValueOf<Color>("BLUE") 
    println(selectedColor == Color.BLUE) // prints: true 

To display all values in the Color enum, use the values function (like in Java):

    for (color in Color.values()) { 
        println("name: ${it.name}, ordinal: ${it.ordinal}") 
    } 

Or you can use the Kotlin enumerateValues helper method:

    for (color in enumValues<Color>()) { 
        println("name: ${it.name}, ordinal: ${it.ordinal}")   ...