void main() {
  int a = 10;
  String name = 'Hello';
  
  var b = 'sadas';
  b = '20';
  
  dynamic c = 'abc';
  c = 50;
  
  List<String> members = ['a', 'b'];
  String one = members[1];
  
  var team = [];
  
  Map<String, dynamic> human = {
    'age' : 10,
    'name' : 'kim',
    'assets' : ['web', 'app', 'server']
  };
  
  String name1 = human['name'];
  String server = human['assets'][3];
  
  print(server);
}

void main() {
  add10_20();
  add10_20();
  addTwoNum(1,2);
  addTwoNum1(num1:1, num2:2);
}

void addTwoNum1({int num1=0, required int num2}) {
  int sum = num1 + num2;
}

void addTwoNum(int num1, int num2) {
  int sum = num1 + num2;
  print(sum);
}

void add10_20() {
  int a = 10;
  int b = 20;
  int c = a+b;
  print(a+b);
}