Duck typing

Style of dynamic typing in object-oriented programming

In computer programming, duck typing is an application of the duck test—"If it walks like a duck and it quacks like a duck, then it must be a duck"—to determine whether an object can be used for a particular purpose. With nominative typing, an object is of a given type if it is declared as such. With duck typing, an object is of a given type if it has all methods and properties required by that type. Duck typing may be viewed as a usage-based structural equivalence between a given object and the requirements of a type.

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