ruby類名之間<,<=方法

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有時候看源碼的時候看到類名之間存在<.<=操作，頓時一頭霧水，類名之間也可以比較嗎？查了下api，豁然開朗

Class的父類是Module，Module.methods.grep(/</)

 

會得到匹配的結果集：[:<=>,:<,:<=]

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”).

 

ruby類名之間<,<=方法