null_safety.dart
Dart•고급
탐색기
C40
C++40
C#40
Dart
초급10
중급10
고급10
user_service.dart
stream_handler.dart
null_safety.dart
extension_method.dart
cascade_operator.dart
generic_class.dart
mixin_usage.dart
arrow_function.dart
factory_constructor.dart
spread_operator.dart
전문가5
마스터5
Go40
Java40
JavaScript40
Kotlin40
Objective-C40
Perl40
PHP40
Python40
R40
Ruby40
Rust40
Shell40
Swift40
TypeScript40
null_safety.dart
Click to focus
1
2
3
4
String processData(String? input) {↵
final data = input?.trim() ?? 'default';↵
return data.isEmpty ? 'empty' : data.toUpperCase();↵
}
0WPM•0%•0:00•0/136(0%)|Ln 1, Col 1
UTF-8•Dart