Trace method calls in console

interceptor.coffee

interceptor = (klass) ->
  for own key, value of klass
    f = (k, v) ->
      if typeof value == "function"
        klass[k] = ->
          console.log "Called #{k} from #{arguments.callee.caller.toString()}", arguments
          v.apply(this, arguments)
    f key, value

// interceptor(Foo.prototype)