Follow these steps to get through this recipe:

1. Create a file named sample_and_then.rs and open it in your text editor.
2. Write the code header with the relevant information:

        //-- #########################
        //-- Task: Implementing and_then 
        //-- Author: Vigneshwer.D
        //-- Version: 1.0.0
        //-- Date: 26 March 17
        //-- #########################

3. Create the enum types Food and Day:

        #![allow(dead_code)]

        #[derive(Debug)] enum Food { CordonBleu, Steak, Sushi}
        #[derive(Debug)] enum Day { Monday, Tuesday, Wednesday}

4. Define a function named have_ingredients that will accept the Food type as an input argument and return Option<Food>:

        fn have_ingredients(food: Food) -> Option<Food> {
          match food {
            Food::Sushi => None,
            _ => Some(food),
          }
        }

5. Define a function named have_recipe that will accept the Food type as an input argument and return Option<Food>:

        fn have_recipe(food: Food) -> Option<Food> {
          match food {
            Food::CordonBleu => None,
            _ => Some(food),
          }
        }

6. Define a function named cookable that will accept the Food type as an input argument and return Option<Food>:

        fn cookable(food: Food) -> Option<Food> {
          have_ingredients(food).and_then(have_recipe)
        }

7. Define a function named eat that will accept the Food type as an input argument and return Day:

        fn eat(food: Food, day: Day) {
          match cookable(food) {
            Some(food) => println!("Yay! On {:?} we get to eat
            {:?}.", day, food),
            None => println!("Oh no. We don't get to eat on 
            {:?}?", day),
          }
        }

8. Define the main function; it will initialize and call all the functions:

        fn main() {
          let (cordon_bleu, steak, sushi) = (Food::CordonBleu,
          Food::Steak, Food::Sushi);

          eat(cordon_bleu, Day::Monday);
          eat(steak, Day::Tuesday);
          eat(sushi, Day::Wednesday);
        }

You will get the following output upon successful execution of the code: