Question 190991 in Flutter Question posted in
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Removing duplicate items in the list and getting their number Dart Flutter

I have a list of objects and I want to remove duplicates and also add the number of removed items to the remaining item in the list.

var data = [
  {
    name: "book",
    qty: 1
  },
  {
    name: "book"
    qty: 1
  },
  {
    name: "book",
    qty: 1
  },
  {
    name: "pen",
    qty: 1
  },
  {
    name: "pen",
    qty: 1
  },
 
];

The result should be something like this

[{name: "book", qty: 3},{name: "pen",qty: 2}],
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2

Answers


  1. 0

    You can do this by using the collection library
    Import the collection library by typing

    import 'package:collection/collection.dart';

    and then use the groupby function to group the items together, Here’s an example code

    var consolidatedData = groupBy(data, (obj) => obj['name'])
      .values
      .map((group) => {
            'name': group.first['name'],
            'qty': group.length,
          })
      .toList();

    I hope this helps

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  2. 0

    Below link may help you. It does have solution to remove duplicate records.

    https://www.fluttercampus.com/guide/175/how-to-unique-list-of-objects-by-property-value-in-dart-flutter/

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