Mastering Kotlin

Local functions

Kotlin supports the notion of functions defined within other functions. This type of function is known as a local function. Local functions can be defined quite similarly to other functions, with two exceptions:

• A local function must be defined within another function.
• Local functions do not support visibility modifiers.

To better understand local functions, we'll use an example. In this code, we've defined two local functions, handleSuccess and handleError, within the handleNetworkResponse function:

fun handleNetworkResponse(response: Response<Person>) {    fun handleSuccess(person: Person) {        // handle successful response    }    fun handleError(error: Throwable?) {        // handle error    }        when (response.isSuccess) {        true -> handleSuccess ...