34_maps_and_hashmap.dart

// Objectives
// 1. Maps
// --> KEY has to be unique
// --> VALUE can be duplicate

void main() {
  Map<String, int> numbers = {"Alex": 1, "Bongo": 2, "Peter": 3};

  Map<String, String> fruits = Map(); // Method 2: Using Constructor
  fruits["apple"] = "red";
  fruits["banana"] = "yellow";
  fruits["guava"] = "green";

  print(fruits.containsValue("green"));
  print(
      fruits.containsKey("apple")); // returns true if the KEY is present in Map
  fruits.update(
      "apple", (value) => "green"); // Update the VALUE for the given KEY
  fruits.remove("apple"); // removes KEY and it's VALUE and returns the VALUE
  fruits.isEmpty; // returns true if the Map is empty
  fruits.length; // returns number of elements in Map
//	fruits.clear();                                     // Deletes all elements

  print(fruits["apple"]);

  print("\n");

  for (String key in fruits.keys) {
    // Print all keys
    print(key);
  }

  print("\n");

  for (String value in fruits.values) {
    // Print all values
    print(value);
  }

  Map<int, int> m = {};
  m[1] = 2;

  print(m[1]);

  print("\n");

  fruits.forEach(
      (key, value) => print("key: $key and value: $value")); // Using Lambda
}