In Statically Typed Languages
Certain usually statically typed languages such as Boo and the version 4 release of C# have extra type annotations that instruct the compiler to arrange for type checking of classes to occur at run-time rather than compile time, and include run-time type checking code in the compiled output. Such additions allow the language to enjoy most of the benefits of duck typing with the only drawback being the need to identify and specify such dynamic classes at compile time.
Read more about this topic: Duck Typing
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