a newbie question: Kotlin reflection, if I have a `p: KProperty<SomeClass, *>`, how do I check...

# getting-started

[Steven Wang]

a newbie question: Kotlin reflection, if I have a p: KProperty<SomeClass, *>, how do I check this property is defined as val or var in it's containing class?

[Wout Werkman]

You can check if it's instance of KMutableProperty

class A(var a: Int)

class B(val a: Int)

fun isMutable(prop: KProperty<*>): Boolean = prop is KMutableProperty<*>

println(isMutable(A(1)::a)) // true
println(isMutable(B(1)::a)) // false

[Wout Werkman]

Adjusted to your SomeClass type:

interface SomeClass {
    val a: Int
}

class A(override var a: Int): SomeClass
class B(override val a: Int): SomeClass

fun isMutable(prop: KProperty1<out SomeClass, *>): Boolean = prop is KMutableProperty<*>

println(isMutable(A::a))
println(isMutable(B::a))

[Steven Wang]

thank you!!!