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kotlinlang

You mean I guess, why is the lambda in `{}` outside of the parentheses of the call to `someFunction` ?

<@U012XG6B8MT> well, someFunction is just a function that accepts another function, right

it accepts that function, and having done that, it can do what it wants with the passed function (`action`) including call it

It’s a _lambda_ function. The Kotlin syntax is not so common, but the concept exists in pretty much all modern programming languages. The documentation here goes into all the nitty-gritty details <https://kotlinlang.org/docs/lambdas.html>

Just to clarify, only the `{ }` part is the lambda function. Your follow up made it seem like you were more trying to understand `someFunction` itself, which doesn't involve any lambdas.

Right, my bad. `someFunction` is a “higher-order function”, since it operates on a “lambda”

You may want to start with this example:
```fun myAction(x: Int, y: Float): Unit {
       println("first param = $x, second param = $y")
}

fun someFunction(
    someParam: Int,
    action: (someOtherParam: Int, lastParam: Float) -&gt; Unit
) {
    action(0, 9f)
}

fun main() {
       someFunction(2, ::myAction)
}```

here you only need to learn/know about higher order functions

once this example makes sense, you can also learn lambdas