{"id":"null-iterator-for-leaf-glyphs","text":"NullIterator is a degenerate iterator for leaf glyphs whose IsDone() always returns true, eliminating null checks throughout traversal code — an instance of the Null Object pattern.","truth_value":"IN","source":"entries/2026/06/17/gof-oo-chunk-6.md","source_url":"","source_hash":"","justifications":[],"dependents":["null-iterator-propagates-transparency-cost-across-pattern-boundaries"],"metadata":{"last_premise_reviewed":"2026-06-17T18:19:22","premise_review_result":"pass"},"created_at":"2026-06-17T21:30:29+00:00","updated_at":"2026-06-17T21:30:29+00:00","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"null-iterator-for-leaf-glyphs","truth_value":"IN","reason":"premise"}]}}