polymorphism.kt

package com.bizyback.play.circletest

/**
 * The implementation of the prepare function is abstracted from the callers
 */
interface Food {
    fun prepare(time: Int): String = "Preparing ${getIngredients()} as a ${this::class.simpleName} in $time minutes"
    fun getIngredients(): String
}

data class Meal(val name: String = "biryani") : Food {
    override fun getIngredients() = name
}

data class Salad(val ingredients: List<String> = listOf("tomato", "onions")) : Food {
    override fun getIngredients() = ingredients.joinToString()

}

fun main() {
    val salad: Salad = Salad()
    val meal: Meal = Meal()
    cook(salad)
    cook(meal)
    cook(salad as Food)
}

/**
 * THE cook function is polymorphic and has different forms
 */
fun cook(meal: Meal) {
    println(meal.prepare(10))
}

fun cook(salad: Salad) {
    println(salad.prepare(15))
}

fun cook(food: Food) {
    println(food.prepare(2))
}