Timo

.gitignore

@@ -6,6 +6,7 @@
 build/
 flutter_*.png
 pubspec.lock
+.metadata
 
 # IntelliJ IDEs
 .idea/

README.md

@@ -8,7 +8,11 @@
   - Asynchrone Programmierung
 - [Flutter](flutter/flutter.md)
   - Widgets
-  - Build Context
+  - Layout
+  - BuildContext
+  - Styling & Theming
+  - State
+  - Debugging
 - [Riverpod](riverpod/riverpod.md)
 - [Bloc](bloc/bloc.md)
   - Cubit

analysis_options.yaml

@@ -0,0 +1 @@
+include: package:flutter_lints/flutter.yaml

dart/README.md

@@ -310,6 +310,14 @@ void main() async {
 
 Für mehr Details über Streams siehe die Dokumentation zum [nutzen](https://dart.dev/libraries/async/using-streams) und [erstellen](https://dart.dev/libraries/async/creating-streams) von Streams.
 
+## Networking
+
+*TODO*
+
+## Code Generation
+
+*TODO*
+
 ## Weiterführendes
 
 - [Late/Lazy Variablen](https://dart.dev/language/variables#late-variables)

dart/challenges.dart

@@ -1,46 +1,51 @@
 // Challenge 1: Null Safety
 String toUpperCaseOrDefault(String? input) {
-  // TODO: Implement logic to return the uppercase version or "DEFAULT" if null
-  return "";
+  return input?.toUpperCase() ?? "DEFAULT";
 }
 
 // Challenge 2: Typecasts
 String describeObject(Object obj) {
-  // TODO: Implement logic to handle String, int, and other types
-  // If the object is a String, return its length
-  // If the object is an int, return its square
-  // For other types, return "Unknown type"
-  return "";
+  if (obj is String) {
+    return obj.length.toString();
+  } else if (obj is int) {
+    return (obj * obj).toString();
+  } else {
+    return "Unknown type";
+  }
 }
 
 // Challenge 3: Asynchronous Programming
 Future<String> processUserName(
   Future<Map<String, String>> userDataFuture,
 ) async {
-  // TODO: Wait for the future to complete and extract the "name" value
-  // If the "name" key is not present, return "Unknown"
-  return "";
+  final userData = await userDataFuture;
+  return userData["name"] ?? "Unknown";
 }
 
 // Challenge 4: Classes and Constructors
-// Tests are commented out to avoid errors
 class Person {
   String name;
   int age;
 
-  // TODO: Add default constructor
-
-  // TODO: Add named constructor with default values "Default Name" and 18
-
-  // TODO: Add factory constructor with caching logic
-
   Person(this.name, this.age);
+
+  Person.named()
+      : name = "Default Name",
+        age = 18;
+
+  static final Map<String, Person> _cache = {};
+  factory Person.factory(String key) {
+    if (_cache.containsKey(key)) {
+      return _cache[key]!;
+    } else {
+      final person = Person(key, 30);
+      _cache[key] = person;
+      return person;
+    }
+  }
 }
 
 // Challenge 5: Optional and Named Parameters
-// Tests are commented out to avoid errors
-String createUser() {
-  // TODO: Add the right parameters to the function
-  // return "Name: $name, Age: $age, Email: $email";
-  return "";
+String createUser(String name, [String? email, int age = 18]) {
+  return "Name: $name, Age: $age, Email: $email";
 }

dart/test/challenges_test.dart

@@ -32,23 +32,29 @@ void main() {
 
   // Test for Challenge 4: Classes and Constructors
   test('Person constructors work as expected', () {
-    // final person = Person("Alice", 30);
-    // expect(person.name, equals("Alice"));
-    // expect(person.age, equals(30));
+    final person = Person("Alice", 30);
+    expect(person.name, equals("Alice"));
+    expect(person.age, equals(30));
 
-    // final namedPerson = Person.named();
-    // expect(namedPerson.name, equals("Default Name"));
-    // expect(namedPerson.age, equals(18));
+    final namedPerson = Person.named();
+    expect(namedPerson.name, equals("Default Name"));
+    expect(namedPerson.age, equals(18));
 
-    // final cachedPerson = Person.factory("cached");
-    // final sameCachedPerson = Person.factory("cached");
-    // expect(cachedPerson, same(sameCachedPerson));
+    final cachedPerson = Person.factory("cached");
+    final sameCachedPerson = Person.factory("cached");
+    expect(cachedPerson, same(sameCachedPerson));
   });
 
   // Test for Challenge 5: Optional and Named Parameters
   test('createUser handles optional and named parameters', () {
-    // expect(createUser("Alice"), equals("Name: Alice, Age: 18, Email: None"));
-    // expect(createUser("Bob", "[email protected]"), equals("Name: Bob, Age: 18, Email: [email protected]"));
-    // expect(createUser("Charlie", null, 25), equals("Name: Charlie, Age: 25, Email: None"));
+    expect(createUser("Alice"), equals("Name: Alice, Age: 18, Email: null"));
+    expect(
+      createUser("Bob", "[email protected]"),
+      equals("Name: Bob, Age: 18, Email: [email protected]"),
+    );
+    expect(
+      createUser("Charlie", null, 25),
+      equals("Name: Charlie, Age: 25, Email: null"),
+    );
   });
 }