ডার্ট

void main() {
  Map<String, String> user = {
      "নাম": "মোঃ আরিফ",
      "দেশ": "বাংলাদেশ"
  };

  var result = user.keys;

  print(result);
}

void main() {
  Map<String, String> user = {
      "নাম": "মোঃ আরিফ",
      "দেশ": "বাংলাদেশ"
  };

  var result = user.values;

  print(result);
}

void main() {
  Map<String, String> user = {
      "নাম": "মোঃ আরিফ",
      "দেশ": "বাংলাদেশ"
  };

  bool result = user.containsKey("নাম");

  print(result);
}

void main() {
  Map<String, String> user = {
      "নাম": "মোঃ আরিফ",
      "দেশ": "বাংলাদেশ"
  };

  bool result = user.containsValue("বাংলাদেশ");

  print(result);
}

void main() {
  Map<String, String> user = {
      "নাম": "মোঃ আরিফ",
      "দেশ": "বাংলাদেশ"
  };

  user.addAll({"শহর": "ঢাকা"});

  print(user);
}

void main() {
  Map<String, String> user = {
      "নাম": "মোঃ আরিফ",
      "দেশ": "বাংলাদেশ"
  };

  user.remove("নাম");

  print(user);
}

void main() {
  Map<String, String> user = {
      "নাম": "মোঃ আরিফ",
      "দেশ": "বাংলাদেশ"
  };

  user.removeWhere((key, value) => key == "নাম");

  print(user);
}

void main() {
  Map<String, String> user = {
      "নাম": "মোঃ আরিফ",
      "দেশ": "বাংলাদেশ"
  };

  user.clear();

  print(user);
}

void main() {
  Map<String, String> user = {
      "নাম": "মোঃ আরিফ",
      "দেশ": "বাংলাদেশ"
  };

  user.update(
      "নাম",
      (value) => "আরিফ"
  );

  print(user);
}

void main() {
  Map<String, String> user = {
      "নাম": "মোঃ আরিফ",
      "দেশ": "বাংলাদেশ"
  };

  user.putIfAbsent(
      "শহর",
      () => "ঢাকা"
  );

  print(user);
}

void main() {
  Map<String, String> user = {
      "নাম": "মোঃ আরিফ",
      "দেশ": "বাংলাদেশ"
  };

  var result = user.map(
      (key, value) => MapEntry(
          key,
          value
      )
  );

  print(result);
}

void main() {
  Map<String, String> user = {
      "নাম": "মোঃ আরিফ",
      "দেশ": "বাংলাদেশ"
  };

  var result = user.entries;

  print(result);
}