CODEWITHSUNDEEP
flutterdart
Mohammed Nabil
Mohammed Nabil

Reputation: 802

For loop to add numbers and get Average inside Text Widget in Flutter

SCENARIO

I am getting the json data by using flutter_bloc library pattern what i want to achieve is that i want to count/add the star key numbers and divide by length of star means get the average number of stars. Below is the json data and dart code till now what i did.

JSON Data

"feedbacks": [
                {
                    "id": 1,
                    "comment": "Corporate Brand Supervisor",
                    "star": 1,
                    "createdAt": "2021-09-07T11:35:15.954Z",
                    "updatedAt": "2021-09-07T11:35:15.954Z",
                    "customerId": 10,
                    "branchId": 3
                },
                {
                    "id": 9,
                    "comment": "Principal Implementation Liaison",
                    "star": 1,
                    "createdAt": "2021-09-07T11:35:15.954Z",
                    "updatedAt": "2021-09-07T11:35:15.954Z",
                    "customerId": 1,
                    "branchId": 3
                }
            ],

HomePage.dart

Row(
children: [
for (var i in data[index].feedbacks!)
Text(i!.star!.toString()),],), //Here expecting an average number of stars 1+1/2 = 1.5

Upvotes: 0

Views: 210

Answers (1)

kounex
kounex

Reputation: 1715

If you want to only display the result (average) value of stars in a Text widget, you can do this:

Text((data[index]['feedbacks']!.map<int>((feedback) => feedback['star'] as int).reduce((acc, curr) => acc + curr) / data[index]['feedbacks']!.length).toStringAsFixed(2))

This assumes that every entry in feedback actually has a star property since I'm dividing by the amount of entries in feedback

I also added toStringAsFixed(2) to ensure that there a 2 decimals after the decimal point (might want to adjust that) instead of having a very long value in cases like 1/3

Upvotes: 2

Related Questions