{"id":"iterator-dual-design-axes","text":"Iterator design decomposes along two orthogonal axes: the control axis determines who drives traversal (external iterators giving clients step-by-step control vs. internal iterators encapsulating the loop), while the concern axis separates the traversal mechanism from the action performed at each element — yielding four quadrants of iterator design.","truth_value":"IN","source":"","source_url":"","source_hash":"","justifications":[{"type":"SL","antecedents":["external-vs-internal-iterator-flexibility-tradeoff","traversal-and-action-orthogonal-concerns"],"outlist":[],"label":"Two independently described Iterator design dimensions (control placement, concern separation) form a two-axis design space"}],"dependents":["recursive-triad-traversal-flexibility"],"metadata":{"source_type":"derived","review_result":"pass"},"created_at":"2026-06-17T23:07:32+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":"iterator-dual-design-axes","truth_value":"IN","reason":"SL justification valid","antecedents":["external-vs-internal-iterator-flexibility-tradeoff","traversal-and-action-orthogonal-concerns"],"label":"Two independently described Iterator design dimensions (control placement, concern separation) form a two-axis design space"},{"node":"external-vs-internal-iterator-flexibility-tradeoff","truth_value":"IN","reason":"premise"},{"node":"traversal-and-action-orthogonal-concerns","truth_value":"IN","reason":"premise"}]}}