Create optional-iterable-first-element-in-dart.dart

tipsandtricks/optional-iterable-first-element-in-dart/optional-iterable-first-element-in-dart.dart

@@ -0,0 +1,36 @@
+// 🐦 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
+
+import 'dart:developer' as devtools show log;
+
+extension Log on Object? {
+  void log() =>
+      devtools.log(this?.toString() ?? '\x1b[101m\x1b[30mNULL\x1b[0m');
+}
+
+extension OptionalFirst<T> on Iterable<T> {
+  T? get optionalFirst => isEmpty ? null : first;
+}
+
+void printName([
+  String? name,
+  List<String>? orFirstNameFoundInList,
+]) {
+  name ??= 
+    orFirstNameFoundInList?.optionalFirst 
+    ?? 'No name is found';
+  name.log();
+}
+
+void testIt() {
+  printName(); // prints 'No name is found'
+  printName('Foo'); // prints Foo
+  printName(null, []); // prints 'No name is found'
+  printName(null, ['Bar']); // prints Bar
+}