formatting - In CoffeeScript, how should I format a function call that takes an anonymous function and other arguments? -

here's contrived example i've come with:

fn = (f, a, b, c)-> alert("#{f() + + b + c}")  fn((-> "hi"), 1, 2, 3) 

i'm wondering what's suggested way format last line? example easy understand, imagine if anonymous function (the (-> "hi")) multi-line , took multiple arguments. code become ugly , start lisp-like.

fn2 = (f, a, b, c)-> alert("#{f(1, 2) + + b + c}")  fn2(((a, b) ->    c = + b   c), 1, 2, 3) 

this can pretty nasty. there way should format code make more readable or best advice name anonymous function?

i notice few similar questions asking how this. difference here i'm asking how format it.

i've seen style used couple of times:

fn2 (a, b) ->    + b , 1, 2, 3 

for example, in settimeout calls:

settimeout ->   alert '1 second has passed' , 1000 

but think in general it's better separate parameter function in variable:

add = (a, b) ->    + b fn2 add, 1, 2, 3 

or, if it's possible change function definition, make function parameter last one:

fn2 1, 2, 3, (a, b) ->   + b