Addition of multiple student result assessment score in flutter

Question

There is a response from an API that looks like this snippet below, i would like to add the values (student scores over a period of time) and display the total value in the text widget on the UI

data : [
{
score : 10
}

{
score: 34
}

{
score: 45
}
]

Does this answer your question? [What is the cleanest way to get the sum of numbers in a collection/list in Dart?](https://stackoverflow.com/questions/10405348/what-is-the-cleanest-way-to-get-the-sum-of-numbers-in-a-collection-list-in-dart) — raina77ow, Aug 13 '22 at 10:18
List? results; class Result { Result({ this.id, this.assessments, }); String? id; List? assessments; } class Assessment { Assessment({ this.id, this.score, }); String? id; int? score; } @YeasinSheikh — namdi, Aug 13 '22 at 13:25

score 0 · Answer 1 · edited Aug 13 '22 at 10:34

0

You can use a foreach loop to add all values like the example

void main() {

  List data = [
    {"score": 10},
    {"score": 34},
    {"score": 45}
  ];

  int totalScore = 0;

  data.forEach((value) {
    totalScore += value['score'] as int;
  });

  print(totalScore); // Output 89
}

Output: 89

edited Aug 13 '22 at 10:34

OMi Shah

5,768
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34

answered Aug 13 '22 at 10:17

Kaushik Chandru

15,510
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30

score 0 · Answer 2 · answered Aug 13 '22 at 13:40

As for the List<Result>? results; you can fold the assessments

 final result = Result(assessments: [
    Assessment(id: "1", score: 10),
    Assessment(id: "2", score: 34)
  ]);

  int total = result.assessments?.fold(0,
          (previousValue, element) => (element.score ?? 0) + previousValue!) ??
      0;

  print(total);

Addition of multiple student result assessment score in flutter

2 Answers2