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group a list by another value dart

McBurd answered on March 6, 2023 Popularity 4/10 Helpfulness 3/10

answer group a list by another value dart

group a list by another value dart

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import 'package:collection/collection.dart';

class Location {
  int locationId;
  String row;
  String level;
  String bay;
  String position;

  Location(this.locationId, this.row, this.level, this.bay, this.position);
}

class Stock {
  Location location;
  String name;

  Stock(this.location, this.name);
}

void main() {
  List<Stock> stocks = [
    Stock(Location(1, 'A', '1', '1', '1'), 'Stock 1'),
    Stock(Location(2, 'B', '2', '2', '2'), 'Stock 2'),
    Stock(Location(1, 'A', '1', '1', '1'), 'Stock 3'),
    Stock(Location(3, 'C', '3', '3', '3'), 'Stock 4'),
    Stock(Location(2, 'B', '2', '2', '2'), 'Stock 5'),
  ];

  Map<int, List<Stock>> groupedStocks = groupBy(stocks, (Stock stock) => stock.location.locationId);

  groupedStocks.forEach((locationId, stocks) {
    print('Location $locationId:');
    stocks.forEach((stock) {
      print('  - ${stock.name}');
    });
  });
}

Popularity 4/10 Helpfulness 3/10 Language whatever

Source: Grepper

Tags: dart group list whatever

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Contributed on Mar 06 2023

McBurd

0 Answers Avg Quality 2/10

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