Flutter/Dart how to groupBy list of maps

Question

I have this list of maps.

[
    {title: \'Avengers\', release_date: \'10/01/2019\'},
    {title: \'Creed\', release_date: \'10/01/2019\'}
    {title: \'Juman         


        

Answer 1

It may not be the best solution. But it can give you an idea

List arrayData = [
  {"name": 'John', "gender": 'male'},
  {"name": 'James', "gender": 'male'},
  {"name": 'Mary', "gender": 'female'}
];

Retrieve list ​​by gender:

List males = arrayData.where((o) => o['gender'] == "male").toList();
List females = arrayData.where((o) => o['gender'] == "female").toList();

Make new map with desired format:

List result = [
  {
    "male": males.map((f) => {"name": f['name']}).toList()
  },
  {
    "female": females.map((f) => {"name": f['name']}).toList()
  }
];

print:

debugPrint('${result}');

result:

[{male: [{name: John}, {name: James}]}, {female: [{name: Mary}]}]