Getting Started

Introduction

Remind students of the game they played in the last stage. What were some of the tricky elements of constructing a good conditional statement?

• Order matters (the first condition in the list to return true wins).
• Write clear and explicit conditions.
• Use the else clause as a catch-all for conditions that you don't expect or can't write explicit conditions for.
• All conditionals must have at least one condition and an else statement, you can add or remove further conditions using the blue buttons.

At the end of this stage, students will return to their Big Game to complete the update-player function. This function contains a conditional that will check which key was pressed (using key codes), and move the player up or down accordingly. We've provided a key code reference for students in case they wish to use keys other than the default up (38) and down (40) arrows.

Activity

Online Puzzles

Head to Course B Stage 9 in Code Studio to get started programming.

Extension Activities

Improving Luigi's Pizza

The final puzzle in the Luigi's Pizza sequence is a Free Play puzzle that allows for students to extend the program in a number of different ways. While some of the potential extensions seem simple, they can be deceptively challenging to get working. Allow students to explore extensions individually, or choose one to work through as a whole class.

• Coupon Code: Write a function coupon that takes in a topping and a coupon code and returns the price of a pizza with that topping, with %40 off is the code is correct.
• Multiple Toppings: Write a function two-toppings that takes in two toppings and returns the price of a pizza with those toppings.
• Picture Menu: Write a function pizza-pic that takes in a topping and returns a simple image representing a pizza with that topping.

Update Player

The update-player function is one of the most extensible in the Big Game. Here's a brief list of potential challenge extensions to give students:

• Warping: instead of having the player’s y-coordinate change by adding or subtracting, replace it with a Number to have the player suddenly appear at that location. (For example, hitting the "c" key causes the player to warp back to the center of the screen, at y=200.)
• Boundary-detection: Keep the player on screen by changing the condition for moving up so that the player only moves up if the up ke was pressed AND player-y is below the top border. Likewise, change the condition for down to also check that player-y is above the bottom.
• Wrapping: Add a condition (before any of the keys) that checks to see if the player’s y-coordinate is above the screen. If it is, have the player warp to the bottom. Add another condition so that the player warps back up to the top of the screen if it moves below the bottom.
• Dissapear/Reappear: Have the player hide when the "h" key is pressed, only to re-appear when it is pressed again!