Lambda

1. Given a list of Articles, Cart calculates the bill summing all the Prices;
2. DiscountCart applies a 50% discount to all articles whose Price is greater than 5 CHF;
3. With FreeDrinkCart all the drinks are for free;
4. With PromotionCart all the articles whouse Price is smaller than 2 CHF are given for free;
5. In DiscountCart, the discount and the threshold can be parametrized;
6. Remove all the duplicated code, applying the Strategy Pattern;
7. Replace theinterface and the 3 carts with a delegate and 3 methods;
8. Replace the 3 methods with local functions;
9. Replace local functions with a local delegate;
10. Replace the delegate in the cart constructor with a Func;
11. Simplify the syntax with a Lambda expression.