duck typing

Etymology
From the so-called duck test: “if it looks like a duck, swims like a duck, and quacks like a duck, then it probably is a duck.”

Noun

 * 1)  A style of dynamic typing in which an object's current set of methods and properties determines the valid semantics, rather than its inheritance from a particular class or implementation of a specific interface.

Translations

 * Finnish: ankkatyypitys
 * French:
 * German: Duck-Typing