使用类变量来跟踪与类有关的数据。 定义类方法以公开与类有关的数据。 概述 在本实验中，我们将处理Song类。 Song类可以制作单独的歌曲。 每首歌都有一个名字，一个艺术家和一个流派。 我们需要Song类来跟踪它创建的歌曲数。

Local Variables: Oh yes, Ruby has not been immune to the greatest evil of all: purely hash table-based local variables. A “pure” version of Python would have to do the same, although in practice no ...

Ever since the invention of the computer, software development has been trending towards higher-level languages. From assembly language, to C, to C++, to Java, each step up has met with the same ...