How to properly override a class so that is uniquely added to a Map in Flutter [Dart]

Issue I want to create a Map<ActivityProject, int> in Flutter and have activityProject uniquely stored inside the map. Below you can see a snipped code. void main() { Map<ActivityProject, int> timesheet = Map.identity(); timesheet.putIfAbsent(ActivityProject(‘activity’, ‘project’), () => 1); timesheet.putIfAbsent(ActivityProject(‘activity’, ‘project’),

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