intro_008.1.dart

void main() {
  
  // an array is a collection of objects
  var dance = [Moves.LEFT,Moves.RIGHT,Moves.JUMP,];
  
  print('${dance[0]}');

  for (var move in dance) {
    print('$move');
  }
  
  print ('===================================');
  
  // a map is a collection of keys and values
  
  var moveCost = {
    Moves.LEFT: 1,
    Moves.RIGHT: 1,
    Moves.FORWARD: 1,
    Moves.BACK: 1,
    Moves.JUMP: 3
  };
  
  
  // collections can be used as streams
  // stream is an object which emits other objects
  // so we can process each one at a time
  
  // dance is a collection so it can emit its members
  dance 
    //map the move to its cost
    .map(
      (move) => moveCost[move]
    )
    //and for each cost print the result
    .forEach(
      (expense) => print('Cost of the move $expense')
    );
  
}

enum Moves {
  FORWARD,
  BACK,
  LEFT,
  RIGHT,
  JUMP,
}