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how to groupby list of maps in flutter

var data = [
     {"title": 'Avengers', "release_date": '10/01/2019'},
     {"title": 'Creed', "release_date": '10/01/2019'},
     {"title": 'Jumanji', "release_date": '30/10/2019'},
   ];


   var newMap = groupBy(data, (Map oj) => oj['release_date']);

   print(newMap);