Master 20+ software design patterns with live Swift, Java, and Python examples. Interactive quizzes track your progress from Singleton to Observer.
Allows incompatible classes to work together by converting interface
Defines one-to-many dependency so dependents are notified
Ensures a class has only one instance with global access point
Creates objects without specifying exact class to create
Compare identical pattern implementations across Swift, Java, and Python. Switch languages mid-pattern to see how Adapter works in your preferred syntax. Each example includes class definitions, protocols, and method implementations you can reference during actual development.
Five questions per pattern test your understanding of implementation details, not just definitions. Track mastery across all 20+ architecture topics with 0/20 progress indicators. Multiple-choice questions cover when to apply patterns, how they differ, and real-world scenarios.
Beginner patterns like Singleton start your journey. Intermediate patterns including Adapter and Observer build complexity. Advanced patterns prepare you for senior-level interviews. Filter by difficulty level or pattern category: Creational, Structural, Behavioral.
Code Hunter collects absolutely no data from your device. No analytics tracking, no usage monitoring, no personal information gathered. Your learning progress stays entirely on your iPhone. Apple confirms: Data Not Collected status in App Store.
Every pattern includes three views. Overview tab explains the conceptual purpose and key concepts with clear definitions. Code tab displays working implementations in your selected language. Use Cases tab describes practical application scenarios where the pattern solves real problems.
Find patterns by name with instant search. Sort by name or difficulty level. Filter grid view by Creational, Structural, or Behavioral categories. Dropdown menus let you narrow down All Difficulties to specific skill levels. Navigate 20+ patterns efficiently with bottom tab bar.
Code Hunter shows the same design pattern implemented in three languages. Compare Swift protocols to Java interfaces to Python classes side-by-side.
Each pattern includes complete class implementations, not pseudocode. Copy-paste ready syntax you can adapt to your actual projects.
Software engineering interviews frequently test design pattern knowledge. Code Hunter organizes patterns by category and difficulty, matching how interviewers structure questions. Quiz yourself on Factory Method before your Google interview. Review Observer pattern implementation before discussing pub-sub architectures.
Intermediate badge indicates patterns commonly asked at mid-level positions. Advanced patterns appear in senior engineer interviews. Beginner patterns establish foundational understanding expected at all levels.
Subtle design enhancements improve usability across all pattern detail screens, quiz interfaces, and navigation elements. Refined spacing and contrast make code examples more readable.
The app now runs faster and more efficiently on iPhone, Mac with Apple M1, and Apple Vision. Reduced load times when switching between Swift, Java, and Python code examples.
Fixed minor issues to enhance reliability across pattern library searches, quiz question navigation, and progress tracking synchronization. Improved stability on iOS 15.6 through latest versions.