Question

Hi everyone: Suppose I have a function “foo” that should receive two functions as parameters. If I have two lambda functions, I can call “foo” as follows:

foo (-> 1),(-> 2)

In this case, “foo” receives two functions, one that just returns 1 and another that returns 2.

However, usually lambda functions are more complicated, so putting both functions on a single line is impractical. Instead, I would like to write two multiline lambda functions. However, I can’t figure out for the life of me how to accomplish this in coffeescript- Ideally, I would want to write it as follows, but it throws an error:

foo
    ->
        1
    ,
    ->
        2

The best I can come up with that works is super ugly:

foo.apply [
                ->
                        1
        ,
                ->
                        2
        ]

Can any Coffeescript guru show me how I can do this, without getting an error? Thanks!

Answer 1

This should suffice (you could indent the second lamda if you want):

f (-> 
    x = 1
    1 + 2 * x),
-> 
    y = 2
    2 * y

given the function f:

f = (a,b) -> a() + b()

the result should give 3 + 4 = 7