Kotlin Programming Cookbook

How to do it...

Let's follow these steps to understand how custom getter-setters work in Kotlin:

1. The syntax of a Kotlin property looks like this:

var <propertyName>[: <PropertyType>] [= <property_initializer>]  [<getter>]  [<setter>]

So if you use something like val a =1, you get a default getter and setter.

2. Now, let's see how we can create a custom getter. Suppose we have a property whose value depends on another property:

fun main(args: Array<String>) {    val sample=Sample()    println(sample.isListBig)}class Sample{    val array= mutableListOf<Int>(1,2,3)    val isListBig:Boolean        get()=array.size>2}

If you run the preceding code, you'll see the output in the console as follows:

3. As you can see, we can modify the getter in the get method of the ...