摘要： A programming language is said to be dynamically typed when the majority of its type checking is performed at run-time as opposed to at compile-time. In dynamic typing values have types, but variables do not; that is, a variable can refer to a value of any type. Dynamically typed languages includeAP 阅读全文

摘要： In computer programming with object-oriented programming languages, duck typing is a style of dynamic typing in which an object's current set of methods and properties determines the valid semantics[n. 语义学], rather than its inheritance from a particular class or implementation of a specific inte 阅读全文