What is “A” here? ``` fun <T : ViewModel, A>...

# getting-started

[scottiedog45]

What is “A” here?

fun <T : ViewModel, A> singleArgViewModelFactory(constructor: (A) -> T):
        (A) -> ViewModelProvider.NewInstanceFactory {
    return { arg: A ->
        object : ViewModelProvider.NewInstanceFactory() {
            @Suppress("UNCHECKED_CAST")
            override fun <V : ViewModel> create(modelClass: Class<V>): V {
                return constructor(arg) as V
            }
        }
    }
}

[Ruckus]

It's a generic type. The function defines two generic types:
fun <T: ViewModel, A> ...
T, which must be subtype of ViewModel, and A, which can be anything.

[Paul Caswell]

It's the type of the parameter of the constructor you supply. Or - more succinctly, it is the type of the single arg.