Dart Map

map.dart

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
  };
  
  var carList = [
    {
      'model': 'benz',
      'year': 2019,
      'currency': 'CNY',
      'price': 400000.00
    },
    {
      'model': 'honda',
      'year': 2020,
      'currency': 'CNY',
      'price': 150000.00
    }
  ];
  
  print(carList);
  print(user);
  
  // Map => containsKey
  print(''.padLeft(12, '-'));
  print('user Contains Key: age');
  print(user.containsKey('age'));
  print('user Contains Key: job');
  print(user.containsKey('job'));
  
  // Map => forEach
  print(''.padLeft(12, '-'));
  user.forEach((k, value){
    print('user forEach $k - $value');
  });
  
  // Map => remove (at key)
  print(''.padLeft(12, '-'));
  user.remove('age'); 
  print(user); // {name: Nikk.Li, height: 171, weight: 63, children: null}
  
  // Map => keys
  print(''.padLeft(12, '-'));
  print(user.keys);
  
  // Map => values
  print(''.padLeft(12, '-'));
  print(user.values);
  
  // Map => length
  print(''.padLeft(12, '-'));
  print(user.length);
  
  // Map => addAll
  print(''.padLeft(12, '-'));
  user.addAll({
    'location': 'China'
  });
  print(user); 
}