a newbie question Kotlin reflection if I have a `p KProperty kotlinlang #getting-started

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Title

s

Steven Wang

05/16/2023, 3:39 PM

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?

w

Wout Werkman

05/16/2023, 3:49 PM

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

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))

s

Steven Wang

05/16/2023, 4:07 PM

thank you!!!

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