{"id":"extension-spectrum-converges-on-composition","text":"The extension mechanism spectrum (Decorator/skin, Strategy/guts, Template Method/skeleton) reveals a directional preference: composition-based mechanisms (Decorator, Strategy) are systematically superior to inheritance-based ones (Template Method) for run-time flexibility, confirming that the GoF principle favoring composition over inheritance applies specifically to extension strategies.","truth_value":"IN","source":"","source_url":"","source_hash":"","justifications":[{"type":"SL","antecedents":["skin-vs-guts-extension-spectrum","composition-superiority-for-reuse"],"outlist":[],"label":"The extension spectrum (depth-1) evaluated against composition superiority (depth-1) shows a directional convergence"}],"dependents":["boundary-extension-coverage-robust","composition-centric-design-paradigm","decorator-niche-identity-bounded"],"metadata":{"source_type":"derived","review_result":"pass"},"created_at":"2026-06-17T17:55:06+00:00","updated_at":"2026-06-18T06:15:08+00:00","reviewed_at":"2026-06-18T06:15:08+00:00","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"extension-spectrum-converges-on-composition","truth_value":"IN","reason":"SL justification valid","antecedents":["skin-vs-guts-extension-spectrum","composition-superiority-for-reuse"],"label":"The extension spectrum (depth-1) evaluated against composition superiority (depth-1) shows a directional convergence"},{"node":"skin-vs-guts-extension-spectrum","truth_value":"IN","reason":"SL justification valid","antecedents":["decorator-vs-strategy-skin-vs-guts","gof-template-method-vs-strategy-inheritance-vs-delegation","decorator-dynamic-alternative-to-subclassing"],"label":"Three patterns form a spectrum from external wrapping to internal algorithm replacement"},{"node":"decorator-vs-strategy-skin-vs-guts","truth_value":"IN","reason":"premise"},{"node":"gof-template-method-vs-strategy-inheritance-vs-delegation","truth_value":"IN","reason":"premise"},{"node":"decorator-dynamic-alternative-to-subclassing","truth_value":"IN","reason":"premise"},{"node":"composition-superiority-for-reuse","truth_value":"IN","reason":"SL justification valid","antecedents":["favor-composition-over-inheritance","inheritance-breaks-encapsulation","inheritance-compile-time-composition-run-time","delegation-composition-as-powerful-as-inheritance"],"label":"Four independent arguments converge on composition's superiority over inheritance"},{"node":"favor-composition-over-inheritance","truth_value":"IN","reason":"premise"},{"node":"inheritance-breaks-encapsulation","truth_value":"IN","reason":"premise"},{"node":"inheritance-compile-time-composition-run-time","truth_value":"IN","reason":"premise"},{"node":"delegation-composition-as-powerful-as-inheritance","truth_value":"IN","reason":"premise"}]}}