不仅仅是Ruby,大部分的动态语言,包括Python、Javascript等等,都没有interface。但是依然可以实现多态、践行设计原则和设计模式,其中的一个关键概念就是Duck Typing。本文以Ruby为例,简单介绍Duck Typing. Duck Typing Duck Typing,即鸭子类型,是一种从行为层面看待“类”的方式。开篇题中这样描述:如果一只鸟,它走路像鸭...
Duck Typing也是Ruby语言中强大的多态性的基础之一。
By contrast, Ruby’s dynamic nature facilitates a style of type system known as duck typing. In particular, duck typing breaks the strong association between an object’s class and its type by defining types based on what an object can do rather than what class it was born from. This subt...
tracer.trace("in doWork():"); // ... } } 但是Duck Typing语言是另外一个实现替代(其实就是多态)的形式,这用语言通常是Ruby和Python。 当我看见一只鸟,它走路时候像鸭子,游泳时候像鸭子,嘎嘎叫的时候也像鸭子,我就称这只鸟为鸭子。 通俗地说,Duck Typing表达的是client可以使用任何对象只要该对象实现了c...
public class TracerClient { private Tracer tracer;public TracerClient(Tracer tracer) { this.tracer = tracer;} public void doWork() { tracer.trace("in doWork():");// ...} } 但是Duck Typing语言是另外一个实现替代（其实就是多态）的形式，这用语言通常是Ruby和Python。
在项目测试过程中，大多数测试任务都会涉及到多端开发的配合，常见的配合端有客户端、前端、服务端、...
Duck Typing Ruby is a dynamically typed language. Other languages are statically typed. The difference comes down to whether, and how, the language enforces the consistency of the type of variables. The consistency can be enforced (or not, as in Ruby) on the method arguments. For example, ...
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The definition of Duck Typing in wiki is ""When I see a bird that walks like a duck and swims like a duck and quacks like a duck, I call that bird a duck." My understanding is behavior over type, now. That is eazy to undstandin for the programmer who is using dynamic type ...
(with appropriate meaning),36rather than the actual type of the object.373839鸭子类型的起源 Origins of duck-typing,40现在谷歌工程师,Python 社区重要贡献者之一: Alex Martelli 说到,41我相信是 Ruby 社区推动了 duck typing 这个术语的流行.42但是这个duck typing 这种表达在 Ruby 和 Python 火之前,43就...