Functional Kotlin

Enum

Enum in Kotlin is a way to define a set of constant values. Enums are very useful, but not limited, as configuration values:

enum class Flour {  WHEAT, CORN, CASSAVA}

Each element is an object that extends the Flour class.

Like any object, they can extend interfaces:

interface Exotic {  fun isExotic(): Boolean}enum class Flour : Exotic {  WHEAT {    override fun isExotic(): Boolean {      return false     }  },  CORN {    override fun isExotic(): Boolean {      return false    }  },  CASSAVA {    override fun isExotic(): Boolean {      return true    }  }}

Enum can also have abstract methods:

enum class Flour: Exotic {  WHEAT {    override fun isGlutenFree(): Boolean {      return false    }    override fun isExotic(): Boolean {      return false    }  },  CORN { override fun isGlutenFree(): Boolean ...