Question 272007 in Flutter Question posted in
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Flutter – How to filter list of objects according to it's property?

I’d like to eliminate duplicates based on the properties "name" and "price" of each element and filter the list accordingly.

List<Connector> connectorList = [
  Model(name : "Type A", price : 2.30, value : "Value 1"),
  Model(name : "Type B", price : 2.30, value : "Value 2"),
  Model(name : "Type C", price : 2.30, value : "Value 3"),
  Model(name : "Type A", price : 2.30, value : "Value 4"),
  Model(name : "Type B", price : 3.30, value : "Value 5"),
  Model(name : "Type B", price : 2.30, value : "Value 6"),
]

Output:

List<Connector> filteredConnectorList = [
  Model(name : "Type A", price : 2.30, value : "Value 1"),
  Model(name : "Type B", price : 2.30, value : "Value 2"),
  Model(name : "Type B", price : 3.30, value : "Value 5"),
  Model(name : "Type C", price : 2.30, value : "Value 3"),
]
Tags:

2

Answers


  1. 0

    First of all use equatable package to override the == operator:

    import 'package:equatable/equatable.dart';

class Connector with EquatableMixin {
  final String name;
  final double price;
  final String value;

  Connector({
    required this.name,
    required this.price,
    required this.value,
  });

  @override
  List<Object?> get props => [name, price];
}

    Then you can easily use Set data structure to achieve your result:

    List<Connector> filteredConnectorList = connectorList.toSet().toList();
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  2. 0

    With the help of the collection package you could do this

    List<Connector> output = groupBy(connectorList, (e) => (e.name, e.price)).values.map((e) => e.first).toList();
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