Duck-Typing in ColdFusion

What is duck-typing and 开发者_如何学运维how is ColdFusion related?

ColdFusion allows function arguments to be specified as having type any. For this sort of argument, an arbitrary object can be passed in and method calls are bound dynamically at runtime. If an object does not implement a called method, a runtime exception is thrown which can be caught and handled gracefully. In ColdFusion 8, this can be picked up as a defined event onMissingMethod()rather than through an exception handler. An alternative argument type of WEB-INF.cftags.component restricts the passed argument to be a ColdFusion Component (CFC), which provides better error messages should a non-object be passed in.

http://en.wikipedia.org/wiki/Duck_typing#In_ColdFusion