ruby - Is there an inversish method for `Array#include?`? -

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i've wondered if there inverse method include?. given:

str = "a" ary = ["a", "b", "c"]

i can check if string in array rather if array contains string. like:

str.in?(ary)

i can't think of situation necessary, think direction rather other way around.

there no such method in ruby itself, there such method in rails - object#in


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