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  • ruby类名之间<,<=方法

    有时候看源码的时候看到类名之间存在<.<=操作,顿时一头雾水,类名之间也可以比较吗?查了下api,豁然开朗

    Class的父类是Module,Module.methods.grep(/</)

    会得到匹配的结果集:[:<=>,:<,:<=]

    e.g

    mod < other → true, false, or nil

    Returns true if mod is a subclass of other. Returns nil if there’s no relationship between the two. (Think of the relationship in terms of the class definition: “class A<B” implies “A<B”).

    mod <= other → true, false, or nil

    Returns true if mod is a subclass of other or is the same as other. Returns nil if there’s no relationship between the two. (Think of the relationship in terms of the class definition: “class A<B” implies “A<B”).

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  • 原文地址:https://www.cnblogs.com/timsheng/p/3988886.html
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