Maps and HashMaps

 void main() {

  /*var map_name = {
    "key1" : "value1",
    "key2" : 2,
    "key3" : 3.0,
    "key4" : true,
  };
  print(map_name);
  print(map_name["key2"]);
  print(map_name["key5"]);  //"key5" does not exist.so the value will be null.

  map_name["key1"] = "Raman";   //Here, the value will be overwritten
  print(map_name["key1"]);

  map_name["Key1"] = "Ajay";  /*Here,"Key1" : "Ajay" is added because "key1" & "Key1" both are different.
                                so new key will be added automatically.*/
  print(map_name);*/

  /*var map_name = {  //Representing map using literal(First way).
    "Name" : "value1",
    "YearOfExperience" : 2,
    "Avg.Rating" : 3.0,
    "CanLocateToOffice" : true,
  };*/

  var mapName =
      Map(); /*Representing map using constructor(Second way).Here, Map(); constructor underline indicates
                            for using literal -> "{}";here,creating object of class.This is the another way to
                            representing the map.Both ways perform same action.*/

  mapName["Name"] = "Raman";
  mapName["YearOfExperience"] = 2;
  mapName["Avg.Rating"] = 3.0;
  mapName["CanLocateToOffice"] = true;

  print(mapName.isNotEmpty); //Different different operations performed on Map
  print(mapName.isEmpty);
  print(mapName.length);
  print(mapName.keys);
  print(mapName.values);
  print(mapName.containsKey("Name"));
  print(mapName.containsValue(false));
  print(mapName
      .remove("CanLocateToOffice")); //Removes "CanLocateToOffice" key from map
  print(mapName);
}

/// OUTPUT:
/// true
/// false
/// 4
/// (Name, YearOfExperience, Avg.Rating, CanLocateToOffice)
/// (Raman, 2, 3.0, true)
/// true
/// false
/// true
/// {Name: Raman, YearOfExperience: 2, Avg.Rating: 3.0}