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} } // Aplatit une liste de listes en une seule liste List concat() { ","num_views":0,"num_stars":0,"num_comments":0,"representation_num_published_solutions":1,"num_iterations":1,"num_loc":63,"iteration_status":"no_automated_feedback","published_iteration_head_tests_status":"passed","published_at":"2026-05-02T14:24:48.000Z","is_out_of_date":false,"language":"dart","author":{"handle":"Abdelkerim516"},"exercise":{"title":"عمليات القوائم","icon_url":"https://assets.exercism.org/exercises/list-ops.svg"},"track":{"title":"Dart","icon_url":"https://assets.exercism.org/tracks/dart.svg","highlightjs_language":"dart"},"links":{"public_url":"https://exercism.org/ar/tracks/dart/exercises/list-ops/solutions/Abdelkerim516","private_iterations_url":"https://exercism.org/ar/tracks/dart/exercises/list-ops/iterations"}},{"uuid":"4f9d2a2f228d4f86b8e990af8b57bc97","snippet":"// lib/list_ops.dart extension AppendExtension on List { void append(List other) { addAll(other.cast()); } } extension CountExtension on List { int count() => length; 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