KProperty

Learn property info with KProperty.

Property info with KProperty

KProperty holds a reference to a property. It is obtained with ::propertyName. name gives the property name; get(instance) gives the value.

Example: class User(val name: String). val prop = User::name. prop.name returns "name". prop.get(User("Alex")) gives "Alex". This pattern reads property values at runtime.

Reading values with get

KProperty.get(instance) reads a property value. For class properties the instance is required; for top-level properties it is not.

Example: val u = User("Alex"); val v = User::name.get(u). This returns "Alex". get provides dynamic access at runtime; it is slower than compile-time access but flexible.

Exercise Read a User property

Define class User(val name: String). In main create val u = User("Alex"), get the reference val prop = User::name and call println(prop.get(u)).

Show example solution

class User(val name: String)

fun main() {
    val u = User("Alex")
    val prop = User::name
    println(prop.get(u))
}

Test yourself

Complete the KProperty reference

class User(val name: String)
val prop = User____

Show answer

class User(val name: String)
val prop = User::name

Which method reads a class property value via KProperty?
```
KProperty.get(instance) gives the value.
```
- get(instance)
- call()
- invoke()
- apply()
Show answer

get(instance) — get(instance) gives the property value.
Match the KProperty parts

User::name

Property reference
prop.name

Property name
prop.get(u)

Value read
val u = User(...)

Instance

Next lesson: KFunction

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