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Apprentice

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Exam →Stats →Learning Path

DesignPatterns

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Exercises (25)

○Singleton — Static property
Beginner
○Singleton — Lazy initialization
Beginner
○Singleton — Closure-based
Intermediate
○Singleton — State preservation
Intermediate
○Singleton — Multiple independent singletons
Advanced
○Observer — Basic subscription
Beginner
○Observer — Multiple subscribers
Beginner
○Observer — Listener count
Intermediate
○Observer — Emit with no listeners
Intermediate
○Observer — Unsubscribe (off)
Advanced
○Factory — Basic object creation
Beginner
○Factory — Creating different types
Beginner
○Factory — Objects with methods
Intermediate
○Factory — Hiding constructor complexity
Intermediate
○Factory — Registry pattern
Advanced
○Decorator — Logged function
Beginner
○Decorator — Timed function
Beginner
○Decorator — Call tracking
Intermediate
○Decorator — Once
Intermediate
○Decorator — Stacked decorators
Advanced
○Strategy — Ascending sort
Beginner
○Strategy — Descending sort
Beginner
○Strategy — Runtime strategy swap
Intermediate
○Strategy — Custom comparator
Intermediate
○Strategy — Multiple strategy instances
Advanced