Maps Hashmaps

 void main() {

  ///When we use by literal in map_name, when initially you have to give any value
  ///then you can give value by open curly bracket

  // var map_name = {
  //   "Name" : "Value1",
  //   "YearOfExperience" : 2,
  //   "Avg.Rating" : 3.0,
  //   "CanLocateToOffice" : true,
  //   "Key5" : false,
  //   "MCQ_Answer" : "a"
  // };
  //print(map_name);
  //print(map_name["Key3"],); //Output : 3.0
  //print(map_name["Key"],);  //Output : null
  //map_name["Key7"] = "Raman";   //Adding new key in the given Map map_name
  // map_name["Key5"] = "Ramanujan";   //Updating Value of Key

  // print(map_name);

  ///   Only method is different but implementation is same
  ///If you want to add value at run time then you can create object of map & you can add data in key-value pair in
  ///whatever object you have taken

  var mapName = Map();

  mapName["Name"] = "Vishal";
  mapName["YearOfExperience"] = 7;
  mapName["Avg.Rating"] = 55.29;
  mapName["CanLocateToOffice"] = true;
  mapName["Key5"] = false;
  mapName["MCQ_Answer"] = "b";

  if(!mapName.isNotEmpty) // isnotempty
    {
      print("is empty");
  }
  // print(mapName);

  // print(mapName.isEmpty);   //Checking whether given Map is Empty OR Not
  // print(mapName.isNotEmpty);   //Checking whether given Map is NotEmpty
  // print(mapName.length);    //Measuring the length of the given Map
  // print(mapName.keys);    //Getting all keys present in the given Map
  // print(mapName.values);    //Getting all values present in the given Map
  // print(mapName.containsKey("CanLocateToOffice"),);  //Checking whether given Key is present OR Not in Map
  // print(mapName.containsValue(false),);   //Checking whether given key exist OR Not in mapName Map
  // print(mapName.remove("CanLocateToOffice"),);  //Removing the given key data from Map
  // print(mapName);   //Printing the whole Map (with "Key" : Value,)

  //when you will dynamic your app in Flutter, Whenever you make the application dynamic, the role of the Json increases,
  //Whenever the API is formed. What is API ? => When your phone communicates with the server with the help of API, in the
  //API we have to send some value along OR if some data is coming from there, then in that case the role of the map is very
  //useful because the keys-value pair is also there.This map data type is of the same type. Whenever we make the app dynamic
  //in the building process of the app, then the role of the map will increase in that case.There we will understand the real
  //use of why maps are used.

  ///   Another method for declaration of Map
  var map1 = Map<int, String>();
  map1[2] = "cap";
  map1[3] = "toy";
  map1[4] = "bus";
  map1[5] = "room";

  //print(map1);

  ///   Another method for declaring Map
  Map<String, String> mapOther = {
    "A" : "rahul",
    "B" : "bob",
    "C" : "rony"  };
  // print(mapOther.length);
  // print(mapOther);
}