How to pass a function as a parameter to another function in Kotlin?

Hi! I've just started learning Kotlin after Java and ran into a problem. In Java, I'm used to using interfaces or functional interfaces (e.g., `Consumer`, `Runnable`) to pass behavior into methods. In Kotlin, as I understand, functions are first-class objects and can be passed directly. But I can't figure out the correct syntax. Let's say I have a simple list of numbers, and I want to write a function `processNumbers` that takes a list and a handler function for each element. Here's what I'm trying to do: ```kotlin fun processNumbers(numbers: List, operation: ???) { for (number in numbers) { operation(number) } } fun main() { val numbers = listOf(1, 2, 3, 4, 5) // I want to pass a function here that... ```