Question 78674 in Flutter Question posted in
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how to sum list values from API in flutter

Does anyone here know/have references/examples of how to add up the values in the list in Flutter. Thanks

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2

Answers


  1. 0

    use sum:

    import 'package:collection/collection.dart';

void main() {
  final list = [1, 2, 3, 4];
  final sum = list.sum;
  print(sum); // prints 10
}

    Your question is similar to the question here, refer to it for more information

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  2. 0

    you can use .fold() method

    • fold method:
    T fold<T>(T initialValue, T Function(T, Data) combine)

    example for sum list of object:

    void main() {
  List<Data> listData = [
    Data(count: 10, name: 'a'),
    Data(count: 12, name: 'bc'),
    Data(count: 21, name: 'abc'),
  ];

  int sum = listData.fold(0, (int preValue, data) => preValue + data.count);

  print(sum);// 43
}

class Data {
  int count;
  String name;
  Data({required this.count, required this.name});
}
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