Default parameter values 

/// Sets the [bold] and [hidden] flags ... 
void enableFlags({bool bold = false, bool hidden = false}) 
{...} 
// bold will be true; hidden will be false. 
enableFlags(bold: true);
string say(String from, String msg, [String device = 'carrier pigeon', String mood]) {...}
How to set default values for positional parameters.
  • Your function can use = to define default values for both named and positional parameters.
  • The default values must be compile-time constants.
  • If no default value is provided, the default value is null.
  • You can also pass lists or maps as default values. 
    void doStuff( 
   {List<int> list = const [1, 2, 3], 
   Map<String, String> gifts = const { 
      'first': 'paper', 
      'second': 'cotton', 
      'third': 'leather' 
   }}) { 
   print('list:  $list'); 
   print('gifts: $gifts');
}

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Default parameter values

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