Mastering Kotlin

Functional arguments

Now that we've reviewed working with functional types, let's take a look at how to use those functional types as arguments to other functions.

Here's a basic example of a higher-order function in which we've defined a function parameter matching the function signature of our previously defined onClickHandler variable:

class ViewModel(val viewState: ViewState, val clickHandler:(ViewState) -> Unit)fun createViewModel(viewState: ViewState, clickHandler: (ViewState) -> Unit) : ViewModel {    return ViewModel(viewState, clickHandler)}

We could then pass our onClickHandler function variable as an argument to this newly defined createViewModel() function:

fun main() {    ...        createViewModel(viewState, onClickHandler)}

As with any ...