Kotlin for Enterprise Applications using Java EE

The nullable type

In Kotlin, we can declare a variable to hold a null value using the nullable type.

Let's write a program to check whether the given input is Web. If it is, it should return Web Development. If not, it should return an empty string.

Consider the code for 11_NullType.kts:

fun checkInput (data: String) : String {    if(data == "Web")        return "Web development"    return ""}println(checkInput ("Web"))println(checkInput ("Android"))

The output is as follows:

So far, so good. Let's say that we want to return null if there is no match for the given input:

fun checkInput (data: String) : String {    if(data == "Web") return "Web development" ...