Gang of Four · TypeScript · Tested

Design patterns, implemented cleanly.

Explore all 23 GoF patterns with TypeScript implementations, tests, and concise engineering notes.

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23GoF Patterns

23TypeScript Implementations

40+Test Cases

3Languages

Pattern catalog

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Each entry links to concise docs, TypeScript source, and mirrored tests so the pattern stays easy to study and verify.

BehavioralChain of Responsibilitypatterns/behavioral/chain-of-responsibility/index.ts BehavioralCommandpatterns/behavioral/command/index.ts BehavioralInterpreterpatterns/behavioral/interpreter/index.ts BehavioralIteratorpatterns/behavioral/iterator/index.ts BehavioralMediatorpatterns/behavioral/mediator/index.ts BehavioralMementopatterns/behavioral/memento/index.ts BehavioralObserverpatterns/behavioral/observer/index.ts BehavioralStatepatterns/behavioral/state/index.ts BehavioralStrategy Patternpatterns/behavioral/strategy/index.ts BehavioralTemplate Methodpatterns/behavioral/template-method/index.ts BehavioralVisitorpatterns/behavioral/visitor/index.ts CreationalAbstract Factorypatterns/creational/abstract-factory/index.ts CreationalBuilderpatterns/creational/builder/index.ts CreationalFactory Methodpatterns/creational/factory-method/index.ts CreationalPrototypepatterns/creational/prototype/index.ts CreationalSingletonpatterns/creational/singleton/index.ts StructuralAdapterpatterns/structural/adapter/index.ts StructuralBridgepatterns/structural/bridge/index.ts StructuralCompositepatterns/structural/composite/index.ts StructuralDecoratorpatterns/structural/decorator/index.ts StructuralFacadepatterns/structural/facade/index.ts StructuralFlyweightpatterns/structural/flyweight/index.ts StructuralProxypatterns/structural/proxy/index.ts