how to sum list values from API in flutter-CodePudding

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

CodePudding user response：

To add up the values in a list in Flutter, you can use the fold method of the List class. This method takes an initial value and a function that combines an element of the list with the current result of the fold operation, and applies it to each element of the list to produce a single value.

Here's an example of how you can use fold to add up the values in a list of integers:

List<int> numbers = [1, 2, 3, 4, 5];

int sum = numbers.fold(0, (int previousValue, int element) => previousValue   element);

print(sum); // Output: 15

Alternatively, you can use the reduce method of the Iterable class, which is similar to fold but does not require an initial value. In this case, the first element of the list is used as the initial value, and the function is applied to each subsequent element:

List<int> numbers = [1, 2, 3, 4, 5];

int sum = numbers.reduce((int previousValue, int element) => previousValue   element);

print(sum); // Output: 15

You can also use the sum method of the Iterable class to add up the values in a list. This method returns the sum of all the elements in the list:

List<int> numbers = [1, 2, 3, 4, 5];

int sum = numbers.sum();

print(sum); // Output: 15

CodePudding user response：

use sum:

import 'package:collection/collection.dart';

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

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