Ruby class Hash has method "invert" which make "reversal" between keys and values and delete same keys (in our case its: "1=>:a"). h = {a: 1, b: 2, c: 1} => {:a=>1, :b=>2, :c=>1} h.invert => {1=>:c, 2=>:b}Ruby class Hash has method "invert" which make
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Ruby在Ruby中创建Hash自定义反转函数
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