`sum` does not accept a function as a parameter, the original example had an `foreach` instead of `sum`.

    list filter isEven foreach println

As a side note omitting that many commas and parenthesis is very rare at least based on the Scala projects I've worked on. The above example is equal to the one below:

    list.filter(isEven).foreach(println)

Good points, I tend to mix it up, rarely going parens-free style, but also not parens by default either.

If you wanted to be really explicit you could do:

    list.filter(x=> isEven(x)).foreach(x=> println(x))

yuck ;-)

That example is not quite equivalent, because now you are not passing `isEven` or `println` as arguments, you are passing anonymous functions that call `isEven` and `println`.

I didn't write what you wrote ;-)

foreach takes a collection and applies some function (in this case println).

I've actually had a use case for what you're trying do, so created an extension method on Any, which means you can then do, on Any-thing:

(list filter isEven sum).echo

I also hate typing "println". "echo" I can bang out instantly, and can do so on any expression, before or after its definition.