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Flutter/Dart how to groupBy list of maps

I have this list of maps.

[
    {title: 'Avengers', release_date: '10/01/2019'},
    {title: 'Creed', release_date: '10/01/2019'}
    {title: 'Jumanji', release_date: '30/10/2019'},
]
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I would like to write a code that would group the list of movies by release_date like that.

[
    {'10/01/2019':  [
                  {title: 'Avengers'},
                  {title: 'Creed'}
              ]
  },

   {'30/10/2019': [
                  {title: 'Jumanji'}
              ]
 }
]
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