Cadaguman Maps and Sets

map.dart

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+void main() {
+  const order = ['margherita', 'pepperoni', 'pineapple'];
+  final total = calculateTotal(order);
+  print('Total: \$$total');
+}
+
+double calculateTotal(List<String> order) {
+  const pizzaPrices = {
+    'margherita': 5.5,
+    'pepperoni': 7.5,
+    'vegetarian': 6.5,
+  };
+  var total = 0.0;
+  for (var item in order) {
+    final price = pizzaPrices[item];
+    if (price != null) {
+      total += price;
+    }
+  }
+  return total;
+}

sets.dart

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+void main() {
+  var a = <int>{1, 3};
+  var b = <int>{3, 5};
+
+  var intersection = a.intersection(b);
+
+  var union = a.union(b);
+
+  var unionWithoutIntersection = union.difference(intersection);
+
+  print(unionWithoutIntersection);
+
+  var sum = 0;
+
+  for (var i = 0; i < unionWithoutIntersection.length; i++) {
+    sum += unionWithoutIntersection.elementAt(i);
+  }
+
+  print(sum);
+}