KFunction

Learn method info with KFunction.

Function info with KFunction

KFunction holds a reference to a function. It is obtained with ::functionName. name gives the function name; parameters gives the parameter list.

Example: fun greet(name: String): String = "Hello, $name!". val fn = ::greet. fn.name returns "greet". fn.parameters.size gives 1. This pattern inspects function metadata.

parameters and returnType

KFunction.parameters returns a list of parameters; each has a name and type. returnType gives the function's return type.

Example: fun add(a: Int, b: Int): Int = a + b. ::add.parameters.size returns 2. ::add.returnType gives the Int type. This info is used to process function signatures dynamically.

Exercise Print the greet function name

Define fun greet(name: String): String that returns "Hello, $name!". In main take the reference val fn = ::greet and call println(fn.name).

Show example solution

fun greet(name: String): String {
    return "Hello, $name!"
}

fun main() {
    val fn = ::greet
    println(fn.name)
}

Test yourself

Match the KFunction parts

::greet

Function reference
fn.name

Function name
fn.parameters

Parameters
fn.returnType

Return type
What does KFunction's name property return?
- Parameter count
- Function name
- Return type
- Call result
Show answer

Function name — name gives the function name.

Complete the KFunction reference

fun greet(name: String): String = "Hello, $name!"
val fn = ____

Show answer

fun greet(name: String): String = "Hello, $name!"
val fn = ::greet

Next lesson: call

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