search in maps dart2 , same as list.indexOf?

Issue I Use this sample for search in Map but not work :|: var xmenList = [‘4′,’xmen’,’4xmen’,’test’]; var xmenObj = { ‘first’: ‘4’, ‘second’: ‘xmen’, ‘fifth’: ‘4xmen’, ‘author’: ‘test’ }; print(xmenList.indexOf(‘4xmen’)); // 2 print(xmenObj.indexOf(‘4xmen’)); // ? but I have error

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