Top-level variables aren't globally-scoped and return values are mandatory in CoffeeScript

Question

funName = () ->
  $(\".foo\").addClass(\"bar\");

Compiles into the scope of an anonymous function. Calling funName from the console res

Answer 1

Mike has answered the main question here. The modular wrapper a common point of confusion for CoffeeScript newcomers, as illustrated by these related questions:

• How do I define global variables in CoffeeScript?
• Why use the javascript function wrapper (added in coffeescript) ".call(this)"
• Getting rid of CoffeeScript's closure wrapper

As to your other question: If you don't want a function to return anything, simply make the last line of that function either return by itself or, equivalently, undefined. Either will compile to a function with no return. For instance:

funName = ->
  $(".foo").addClass "bar"
  return

compiles to

var funName;
funName = function() {
  $(".foo").addClass("bar");
};

Note that there is an ongoing discussion (issue 899) about a possible alternative syntax for defining no-return functions. If the current proposal were accepted, you'd be able to write your function as

funName = -/> $(".foo").addClass "bar"

If you like that syntax, you should voice your support for it.