hash配列を指定keyで検索し、取得する。 mast = [{code: "101", name:"abc"}, {code: "201", name:"cde"}, {code: "101", name:"a"}, {code: "102", name:"efg"}, {code: "101", name:"abc"}, {code: "301", name:"b"}] select だと該当する全行を取得(Array…