Android Development with Kotlin

The getter versus property default value

In the preceding example, we used a getter, so the property value is calculated each time the value is retrieved. By omitting the getter, we can create a default value for the property. This value will be computed only once during class creation and it will never change (changing the weight property will have no effect on the isHeavy property value):

    class Fruit(var weight: Double) { 
        val isHeavy = weight > 20 
    } 
  
    var fruit = Fruit(7.0) 
    println(fruit.isHeavy) // Prints: false 
    fruit.weight = 30.5 
    println(fruit.isHeavy) // Prints: false 

This type of property does have a backing field, because its value is always computed during object creation. We can also create read-write properties without a backing ...