fluendo checking for method existence

gistfile1.coffee

# somewhere
extendMaybe = (classObjs...) ->
  for classObj in classObjs
   (methodName, method) -> classObj::[methodName] = method unless classObj::[methodName]?

# top of your file:
[extend] = extendMaybe String

# usage:
extend "append", (stringToAppend)-> @ + if stringToAppend then stringToAppend else ''