Map_(Collection)_Dart

 import 'dart:ffi';

///Introduction to the Dart Map type
/// Map type allows you to manage a collection of key/value pairs. The Map type is
/// similar to the Dictionary type in other programming languages.
/// In a map, keys are unique. Each key has an associated value. Unlike keys, values can
/// be duplicated. Generally, you cannot add or remove keys while performing an
/// operation on the map

///CREATING A MAP
void main()
{
  var fruits = {
    "apple" : 1,
    "banana" : 2,
    "orange" : 3,
    "pineapple" : 4,
    "pomegranate" : 5,
    "coconut" : 6,
    "mango" : 7,
    "grapes" : 8,
    "papaya" : 9,
    "watermelon" : 10,
    "kiwi" : 11,
    "Lemon" : 12,
    "cherry" : 13,
    "strawberry" : 14,
    "blueberry" : 15,
    "pear" : 16
  };
  // print(fruits);
  // print("\n");

  ///ACCESSING ELEMENTS FROM A MAP
  // print(fruits["grapes"]);  //Printing "Value" of particular keys
  // print(fruits["mango"]);   //Printing "Value" of particular keys
  // print(fruits["coconut"]); //Printing "Value" of particular keys
  // print(fruits["watermelon"]);  //Printing "Value" of particular keys

  ///ADDING ELEMENTS TO A MAP
  // fruits["grapefruits"] = 17;
  // // print(fruits);
  //
  // fruits["fig"] = 18;
  //
  // fruits["Apricot"] = 19;
  //
  // fruits["plum"] = 20;
  // print(fruits);
  // print("\n");

  ///UPDATING ELEMENTS TO A MAP
  // fruits["apple"] = 0;
  // print(fruits);
  //
  // fruits["banana"] = 22;
  // print(fruits);
  // print("\n");

  ///REMOVING ELEMENTS
  // fruits.remove("plum");
  // fruits.remove("Apricot");
  // fruits.remove("fig");
  // print(fruits);

  /// The Map type provides some useful properties:
  /// ● map.isEmpty – return true if the map has no element.
  /// ● map.isNotEmpty – return true if the map has at least one element.
  /// ● map.length – return the number of elements of the map.
  /// ● map.keys – return a list of keys.
  /// ● maps.values – return a list of values.

  // print(fruits.isEmpty);
  // print(fruits.isNotEmpty);
  // print("Number of elements in the List are : ${fruits.length}");
  // print(fruits.keys);
  // print(fruits.values);

  ///Checking for the existence of the keys OR values
  // print(fruits.containsKey("strawberry"));  //true
  // print(fruits.containsKey("All fruits"));  //false

  ///Iterating over elements of a map
  // var fruits1 = {
  //   "apple" : 10,
  //   "banana" : 20,
  //   "pineapple" : 30,
  //   "strawberry" : 40,
  //   "watermelon" : 50
  // };

  ///for loop
  // for(var name in fruits1.keys)
  //   {
  //     // print("$name : ${fruits1[name]}\n");
  //     // print("${fruits1.keys} : ${fruits1.values}");
  //     // print("${fruits1.keys}");
  //     // print("${fruits1.values}");
  //   }

  ///for loop
  // for(var name1 in fruits1.entries)
  //   {
  //     print("${fruits1.keys} : ${fruits1.values}");
  //   }

  ///forEach loop
  // fruits1.forEach((key, value) {
  //   return print("$key : $value");
  // });

  ///PRACTICE
  // var cars = {
  //   "Maruti" : 1,
  //   "Hyundai" : 2,
  //   "Toyota" : 3,
  //   "BMW" : 4,
  //   "Ford" : 5,
  //   "TATA" : 6,
  //   "Jeep" : 7,
  //   "Skoda" : 8,
  //   "Renault" : 9,
  //   "Mercedes" : 10
  // };
  //  print(cars);

  var fruitsDemo = {
    "apple" : 1,
    "banana" : 2,
    "cherry" : 3,
    4 : "pomegranate",
    5 : "mango",
    6 : "coconut",
  };
  print(fruitsDemo);
  print("\n");
  // print(fruitsDemo["banana"]);
  // print(fruitsDemo["cherry"]);
  // print(fruitsDemo[5]);
  // print(fruitsDemo[6]);
  //
  // fruitsDemo["strawberry"] = 4;
  // fruitsDemo[7] = "pineapple";
  // print(fruitsDemo);

  // fruitsDemo["banana"] = 7;
  // print(fruitsDemo);

  // fruitsDemo.remove(6);
  // fruitsDemo.remove("cherry");
  // print(fruitsDemo);

  // print(fruitsDemo.isEmpty);
  // print(fruitsDemo.isNotEmpty);
  // print(fruitsDemo.length);
  // print(fruitsDemo.keys);
  // print(fruitsDemo.values);

  // print(fruitsDemo.containsKey("apple"));
  // print(fruitsDemo.containsValue("strawberry"));

  // for(var a in fruitsDemo.keys)
  //   {
  //     print("Key : $a");
  //   }
  // print("\n");
  // for(var b in fruitsDemo.values)
  //   {
  //     print("Value : $b");
  //   }
  // print("\n");
  // for(var allkeys in fruitsDemo.keys)
  //   {
  //     print("${allkeys} : ${fruitsDemo[allkeys]}");
  //   }

  // for(var c in fruitsDemo.entries)
  //   {
  //     print("${fruitsDemo.keys} : ${fruitsDemo.values}");
  //   }

  fruitsDemo.forEach((key, value) {
    // print("${fruitsDemo.keys} : ${fruitsDemo.values}");
    // print("\n");
    print("$key : $value");
  });

}