Uncaught ReferenceError: namespace is not defined when namespacing in coffeescript-Collection of common programming errors

The namespace function from that question:

namespace = (target, name, block) ->
  [target, name, block] = [(if typeof exports isnt 'undefined' then exports else window), arguments...] if arguments.length < 3
  top    = target
  target = target[item] or= {} for item in name.split '.'
  block target, top

isn’t part of CoffeeScript, you have to define that helper yourself. Presumably you don’t want to repeat it in every file so you’d have a namespace.coffee file (or util.coffee or …) that contains the namespace definition. But then you’re left with the problem of getting your namespace function into the global namespace. You could do it by hand:

namespace = (target, name, block) ->
  [target, name, block] = [(if typeof exports isnt 'undefined' then exports else window), arguments...] if arguments.length < 3
  top    = target
  target = target[item] or= {} for item in name.split '.'
  block target, top

(exports ? @).namespace = namespace
# or just (exports ? @).namespace = (target, name, block) -> #...

Demo: http://jsfiddle.net/ambiguous/Uv646/

Or you could get funky and use namespace to put itself into the global scope:

namespace = (target, name, block) -> #...
namespace '', (exports, root) -> root.namespace = namespace

Demo: http://jsfiddle.net/ambiguous/3dkXa/

Once you’ve done one of those, your namespace function should be available everywhere.