[Dart] 3일차_함수형 프로그래밍_형변환_list, map, set

1)

void main() {
  List<String> blackPink = ['로제', '지수', '리사', '제니', '제니'];
  
  print(blackPink);
  print(blackPink.asMap());
  print(blackPink.toSet());
  
  Map blackPinkMap = blackPink.asMap();
  
  print(blackPinkMap.keys.toList());
  print(blackPinkMap.values.toList());
  
  Set blackPinkSet = Set.from(blackPink);
  
  print(blackPinkSet.toList());
}

2)

void main() {
  List<String> blackPink = ['로제', '지수', '리사', '제니'];
  
  final newBlackPink = blackPink.map((x){
    return '블랙핑크 $x';
  });
  
  print(blackPink);
  print(newBlackPink.toList());
  
  final newBlackPink2 = blackPink.map((x) => '블랙핑크 $x');
  
  print(newBlackPink2 == blackPink);
  print(newBlackPink == blackPink);
  print(newBlackPink == newBlackPink2);
  
  // [1.jpg, 3.jpg, 5.jpg, 7.jpg, 9.jpg]
  String number = '13579';
  
  final parsed = number.split('').map((x) => '$x.jpg').toList();
  
  print(parsed);
}

3)

void main() {
  Map<String, String> harryPotter = {
    'Harry Potter': '해리포터',
    'Ron Weasley': '론 위즐리',
    'Hermione Granger': '헤르미온느 그레인저',
  };
  
  // map을 map으로 변환(거의 쓰이지는 않는다.)
  final result = harryPotter.map(
    (key, value) => MapEntry(
      'Harry Potter Character $key',
      '해리포터 캐릭터 $value',
    ),
  );
  
  print(harryPotter);
  print(result);
  
  // key, value 값 변경(자주 쓰인다.)
  final keys = harryPotter.keys.map((x) => 'HPC $x').toList();
  final values = harryPotter.values.map((x) => '해리포터 $x').toList();
  
  print(keys);
  print(values);
}

4)

void main() {
  Set blackPinkSet= {
    '로제',
    '지수',
    '제니',
    '리사'
  };
  
  final newSet = blackPinkSet.map((x) => '블랙핑크 $x').toSet();
  
  print(newSet);
}