{"id":"digit-sum-pure-function","text":"`digitSum` has no side effects — it rebinds `s` each iteration rather than mutating it, and does not modify `self` or external state.","truth_value":"IN","source":"entries/2026/06/06/calculate-digit-sum-of-a-string-solution.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"digit-sum-pure-function","truth_value":"IN","reason":"premise"}]}}