dart_basics.dart

void main() {
	String name = 'Simone';
  String result = reverse(name);
	print (result);
  String mySongs = sing();
  print (mySongs);
  
  
  String myName = 'Simone';
  String yourName = 'Luke Skywalker';
  
  myName = yourName;
  myName = 'Paul';
  print (yourName);
  
  Person paul = Person();
  Person mary = Person(name:'Mary', surname: 'Brown');
  paul.name = 'Paul';
  paul.surname = 'Green';
  print (paul.name);
  paul = mary;
  print (paul.name);
  paul.name = 'Paul';
  print (mary.name);
  
  
}


double calculateArea(double width, double height) {
  double area = width * height;
  return area;
}
//for and strings
String reverse(String old) {
  int length = old.length;
  print (length);
  String res = '';
  for (int i = length-1; i>=0; i--) {
    print('i: ' + i.toString());
    res += old.substring(i,i + 1);
  }
  return res;
}
//while and generics
String sing() {
  var songs = List<String>();
  var songString = '';
  songs.add('We will Rock You');
  songs.add('Another Brick in the Wall');
  songs.add('Sultans of Swing');
  int i=0;
  while (i < songs.length) {
    songString += '${songs[i]} - '; 
    i++;
  }
  return songString;
}
//arrow syntax
bool convertToBool(int value) => (value == 0)?false:true;

bool convertToBoolLong(int value) {
  if (value == 0) {
    return false;
  }
  else {
    return true;
  }
}

//class, and constructor with optional parameters
class Person {
  String name, surname;
	Person({this.name, this.surname});
}