miquelbeltran

import 'dart:math';

abstract class Shape {
  factory Shape(String type) {
    if (type == 'circle') return Circle(2);
    if (type == 'square') return Square(2);
    throw 'Can\'t create $type.';
  }
  num get area;
}

miquelbeltran

class Bicycle {
  late int cadence;
  late int speed;
  late int gear;
  
  Bicycle(this.cadence, this.speed, this.gear);
  
  @override
  String toString() => 'Bicycle: $speed mph';
}

miquelbeltran

/// built_value template
/// variables:
/// CLASS_NAME

abstract class $CLASS_NAME$ implements Built<$CLASS_NAME$, $CLASS_NAME$Builder> {
  factory $CLASS_NAME$([void Function($CLASS_NAME$Builder) updates]) = _$$$CLASS_NAME$;
  
  $CLASS_NAME$._();
}

miquelbeltran

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',

miquelbeltran

Did you try to use stream.first?

Did you try returning "Top User is: $name"?

Did you try to use future.asStream()?

Check the classes Stream and Future for the method specifications.

miquelbeltran

Did you add the onError to the listen() method?

miquelbeltran

Did you remember to call listen() on the stream?

Did you call to processValue inside listen()?

miquelbeltran

Use the methods `map`, `any` and `where` to solve the exercise.

miquelbeltran

Use map to create a String with the user.name and the user.age 

miquelbeltran

main() {
  var numbersByTwo = [1, -2, 3, 42].map((number) => number * 2);
  print('Numbers: $numbersByTwo.');
}