Create unwrapping-multiple-optionals-in-flutter-and-dart.dart

Author: vandadnp

tipsandtricks/unwrapping-multiple-optionals-in-flutter-and-dart/unwrapping-multiple-optionals-in-flutter-and-dart.dart

@@ -0,0 +1,32 @@
+// 🐦 Twitter                   https://twitter.com/vandadnp
+// 🔵 LinkedIn                  https://linkedin.com/in/vandadnp
+// 🎥 YouTube                   https://youtube.com/c/vandadnp
+// 💙 Free Flutter Course       https://linktr.ee/vandadnp
+// 📦 11+ Hours Bloc Course     https://youtu.be/Mn254cnduOY
+// 🔶 7+ Hours MobX Course      https://youtu.be/7Od55PBxYkI
+// 🦄 8+ Hours RxSwift Coursde  https://youtu.be/xBFWMYmm9ro
+// 🤝 Want to support my work?  https://buymeacoffee.com/vandad
+
+void main(List<String> args) {
+  /// unwrapping multiple optionals
+  print(getFullName(null, null)); // Empty
+  print(getFullName('John', null)); // Empty
+  print(getFullName(null, 'Doe')); // Empty
+  print(getFullName('John', 'Doe')); // John Doe
+}
+
+String getFullName(
+  String? firstName,
+  String? lastName,
+) =>
+    withAll([
+      firstName,
+      lastName,
+    ], (names) => names.join(' ')) ??
+    'Empty';
+
+T? withAll<T>(
+  List<T?> optionals,
+  T Function(List<T>) callback,
+) =>
+    optionals.any((e) => e == null) ? null : callback(optionals.cast<T>());