dpossas

import 'package:flutter/material.dart';

final Color darkBlue = Color.fromARGB(255, 18, 32, 47);

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override

dpossas

void main() {
  print("===================== NOME");

  var nome; //valor padrao null
  print(nome.runtimeType); //tipo inicial Null (objeto Null)
  print(nome == null); //validade inicial
  print(nome == Null); //Null != null
  print(nome is Null); //Objeto Null

  nome = "Douglas";

dpossas

void main() {
 print("Olá!");
}

dpossas

void main() {
  List historico_diagnostico = [
    {
      "Deep Security": [
        [9, 73.33],
        [10, 56.34]
      ]
    },
    {
      "Apex One": [

dpossas

void main() {
  for (int i = 0; i < 5; i++) {
    print('Olá mundo #${i + 1}');
  }
}

dpossas

void main() {
  Bag bag = Bag(items: []);
  print('Total: ${bag.total}');
  
  Product p1 = Product(name: 'Pen', price: 1.15);
  print('Total: ${bag+p1}');
  
  Product p2 = Product(name: 'Pencil', price: 2);
  print('Total: ${bag+p2}');
}

dpossas

import 'package:flutter/material.dart';
import 'dart:math';

///Author: Douglas Bezerra Possas
///Contact: [email protected]
///Gist: https://gist.github.com/dpossas/457c1429931f06e1f5d3cf64cb019408
///GitHub: https://github.com/dpossas/flutter-whatsapp/

final Color darkBlue = Color.fromARGB(255, 18, 32, 47);

dpossas

import 'dart:math';

import 'package:flutter/material.dart';

//Colors
Color crossColor = const Color(0xFF1ABDD5);
Color circleColor = const Color(0xFFD8B9FA);
Color accentColor = const Color(0xFF90A4AE);

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

dpossas

import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

final mrMadruga = Character("Seu Madruga",
    "https://i.pinimg.com/236x/95/5c/4d/955c4d32d280d606df214c7f0aa2e061--humor-meme-funny-jokes.jpg");
final florinda = Character("Dona Florinda",
    "https://encrypted-tbn0.gstatic.com/images?q=tbn%3AANd9GcQJcyNPoY83KMBi_nD1ws_LwWWa_rP3ZVVXJn427QHFZrsFro9g");

dpossas

main() {
  final shopping = new ShoppingCart();

  //o uso da palavra reservada new é opcional a partir da DART 2.0
  //e não usaremos nas próximas linhas
  final pen = Product("Caneta", true, 4.75);
  shopping.addItem(pen);

  final pencil = Product("Lápis", false, 1.25);
  shopping.addItem(pencil);