dart_generic.dart

dart_generic.dart

abstract class Cache<T> {
  T getByKey(String key);
  void setByKey(String key, T value);
}

class StringCashe extends Cache<String> {
  var _cache = Map<String, String>();
  @override
  String getByKey(String key) {
    return _cache[key];
  }

  @override
  void setByKey(String key, String value) {
    _cache[key] = value;
  }
}

/// Generic implementation of cache
class GeneralCache<T> implements Cache<T> {
  var _cache = Map<String, T>();
  @override
  T getByKey(String key) {
    return _cache[key];
  }

  @override
  void setByKey(String key, T value) {
    _cache[key] = value;
  }
}

/// T extends from num
class NumberCache<T extends num> extends GeneralCache<T> {}

/// Generic function typedef
typedef TypedCallback = void Function<T>(T value);


/// Generic method
List<T> merge<T>(List<T> list1, List<T> list2) {
  return [
    ...list1,
    ...list2,
  ];
}

///  Generic extension
extension ListExt<T> on List<T> {
  ///  Generic extension method
  List<T> merge(List<T> ts) {
    return [
      ...this,
      ...ts,
    ];
  }
}


void main() {
  final list1 = <int>[1, 2, 3]; // type check
  final list2 = <int>[5, 6, 7];
  print(list1.merge(list2));
}