nikli2009

void main() {
  print('Hello Dart');
}

nikli2009

void main() {
  // Way 1
  print('----Declare Way 1----'); 
  var unlimited;
  unlimited = 'unlimited';
  print(unlimited);
  // 'unlimited' => 1000.00, ALLOWED
  unlimited = 1000.0;
  print(unlimited);
  

nikli2009

import 'dart:math';

void main() {
  const String USER_NAME = 'nikk';
  // USER_NAME = 'wenyan'; => Error
  
  final String USER_ADDRESS = 'China';
  // USER_ADDRESS = 'United States'; => Error
  
  // ------------------------------------

nikli2009

void main() {
  Car newMercedes = Car(brandName:'Benz', modelName:'G', currency:'USD', msrp:1000.0);
  print('Car: ${newMercedes.brandName} ${newMercedes.modelName}');
  print('Price: ${newMercedes.currency} ${newMercedes.msrp}');
  
  print(''.padLeft(20, '-'));
  
  Car newHonda = Car.shorter(brandName:'Honda', modelName:'Fit');
  print('Car: ${newHonda.brandName} ${newHonda.modelName}');
  

nikli2009

void main() {
  // provide only required parameter
  FunnyText uselessWidget1 = FunnyText('hello');
  // provide an empty named parameter
  FunnyText uselessWidget2 = FunnyText('hello', style: TextStyle());
  // provide a complete named parameter to override DEFAULT value, which is 20.0
  FunnyText uselessWidget3 = FunnyText('hello', style: TextStyle(fontSize: 30.0));
  
  uselessWidget1.printFontSize(); // 20
  uselessWidget2.printFontSize(); // 20

nikli2009

void main() {
  // ? Operator
  Coke myCoke = Coke(volume: 600);
  // this is unsafe as anyone can change volume before printing.
  // for example, myCoke = null
  // then it gonna throw an error.
  
  print(myCoke.volume); // 600
  
  // so let's use ? as null check operator to ensure this won't happen

nikli2009

void main() {
  List<String> usernames = ['lana', 'del', 'rey', 'hope', 'sandoval'];
  
  // add => bottom
  usernames.add('nikk');
  print(usernames); //[lana, del, rey, hope, sandoval, nikk]
  
  // add all
  usernames.addAll(['wenyan', 'li']);
  print(usernames); // [lana, del, rey, hope, sandoval, nikk, wenyan, li]

nikli2009

void main() {
  // handle data
  // use Class is kind of overkill from Design Perspective
  
  var user = {
    'name': 'Nikk.Li',
    'age': 28,
    'height': 171.0,
    'weight': 63,
    'children': null

nikli2009

void main() {
  var orderType = OrderType.Domestic;
  // ENUM item -> index
  print(' '.padLeft(10,'-') + 'Enum index' + ' '.padRight(10,'-'));
  print(orderType.index);
  
  // ENUM item -> value
  print(' '.padLeft(10,'-') + 'Enum value' + ' '.padRight(10,'-'));
  print(orderType);
}

nikli2009

void main() {
  print(' '.padLeft(10,'-') + 'Ternary Operator' + ' '.padRight(10,'-'));
  
  bool expression = true;
  
  // Logic -> used in business logic of binary/simple strategy;
  expression ? {
    print(true)
  } : {
    print(false)