Hands-On Microservices with Kotlin

Inferred types

We may have a function written that returns a value, such as:

fun lower(name : String) : String {  val lower : String = name.toLowerCase()  return "$name in lower case is: $lower"}

Here, we are explicitly indicating the type of the result of the function and the internal variable that we use inside.

In Kotlin, we could infer the type of the variable:

fun lower(name : String): String {  val lower = name.toLowerCase()  return "$name in lower case is: $lower"}

And even the return type of our function could be inferred:

fun lower(name : String) = "$name in lower case is: ${name.toLowerCase()}"

This will be extremely useful as the code that we created with the inferred type did not need to change if we change the type it uses. Let's ...