Ruby – 在类中获取非祖先方法的数组

我不知道你在这里真正想做什么,也不知道“全部”是什么方法,但是如果问题是你如何弄清楚一个类的实例方法是不是被继承的,那么.instance_methods的组合和.ancestors可以得到你的信息.在这里,使用Array作为示例类：

Array.instance_methods.sort                                                                         
=> ["&","*","+","-","<<","<=>","==","===","=~","[]","[]=","__id__","__send__","all?","any?","assoc","at","class","clear","clone","collect","collect!","compact","compact!","concat","delete","delete_at","delete_if","detect","display","dup","each","each_index","each_with_index","empty?","entries","eql?","equal?","extend","fetch","fill","find","find_all","first","flatten","flatten!","freeze","frozen?","grep","hash","id","include?","index","indexes","indices","inject","insert","inspect","instance_eval","instance_of?","instance_variable_get","instance_variable_set","instance_variables","is_a?","join","kind_of?","last","length","map","map!","max","member?","method","methods","min","nil?","nitems","object_id","pack","partition","pop","private_methods","protected_methods","public_methods","push","rassoc","reject","reject!","replace","respond_to?","reverse","reverse!","reverse_each","rindex","select","send","shift","singleton_methods","size","slice","slice!","sort","sort!","sort_by","taint","tainted?","to_a","to_ary","to_s","transpose","type","uniq","uniq!","unshift","untaint","values_at","zip","|"]

Array.ancestors
=> [Array,Enumerable,Object,Kernel]

Array.instance_methods.sort - Array.ancestors.map {|a| a == Array ? [] : a.instance_methods}.flatten
=> ["&","|"]

如果你只是想排除超类的方法,而不是包含的方法,那么还有.superclass.

Array.superclass
=> Object

Array.instance_methods.sort - Array.superclass.instance_methods
=> ["&","|"]

这有帮助吗