javascript - Cannot get proper expression -

how can write following javascript coffeescript

 foo.bar(function() {     dosomething(); })(x, y); 

for instance, following doesn't work:

 foo.bar ->     dosomething() (x, y) 

something this:

f ->     ... (x, y) 

is little ambiguous in coffeescript since (x, y) valid expression on own. since things of form f(g(x)) , f(g) more common f(g)(x), ambiguity resolved 2 statements:

f -> ... 

and

(x, y) 

when parser resolves ambiguity in way don't want, solution resolve ambiguity forcing desired interpretation parentheses:

foo.bar(->     dosomething() )(x, y) 

that becomes this javascript:

foo.bar(function() {   return dosomething(); })(x, y); 

that may or may not have same effect javascript you're trying achieve. if foo.bar cares return value of argument then

return dosomething(); 

and just

dosomething(); 

can quite different; implicit "return last expression's value" in coffeescript can trip up. 1 example jquery's each stop iterating if iterator function returns false continue if iterator returns nothing @ (i.e. undefined). if foo.bar behaves way might want explicitly state foo.bar's argument doesn't return anything:

foo.bar(->     dosomething()     return )(x, y) 

that become this javascript:

foo.bar(function() {   dosomething(); })(x, y); 

and that's you're looking for.

you use named function instead of anonymous one:

pancakes = ->     dosomething() foo.bar(pancakes)(x, y) 

you still have possible return problem noted above (and solve same way) perhaps structure easier read , work with; refactor things way if anonymous function gets longer 5-10 lines makes structure easier me eye-ball.