Getting and setting class attributes in Dart / Flutter

Question

I would like to list a class's attributes and set them too. For example in a ListView when I tap on the value of an attribute I would like to increment it by 1.

Sample class:

class Person {
int age;
int height;
int weight;

Person({
this.age,
this.height,
this.weight,
});

}

Is it possible to list and set these values without writing getter and setter functions for each of the attributes?

Solution

In you code sample, you defined age, height, and weight as public. So, you don't need to define getters and setters. You can directly increment and decrement their values.

void main() {
  final a = Person(age: 25, height: 210, weight: 90);
  a.age++;
  a.height++;
  a.weight++;
  print(a);
  // This person is 26 years old, 211cm tall and weights 91kg

}

class Person {
int age;
int height;
int weight;

Person({
this.age = 0,
this.height = 0,
this.weight = 0,
});
  
toString() => 'This person is $age years old, ${height}cm tall and weights ${weight}kg';

}

However, you might encounter problems by mutating objects if later, you rely on state equality to rebuild a Widget. It's better to handle your State objects as being immutable.

Then, regarding listing the values, if you refer to [dart:mirrors][1], it's not supported by Flutter.