Referenced from lesson Player Animation
Directions: The player moves up and down by 20 pixels each time. Write a function called update-player, which takes in the player’s y-coordinate and the name of the key pressed ("up" or "down"), and returns the new y-coordinate.
Contract and Purpose Statement |
Every contract has three parts…
# _____________::______________->______
# __________________________________________________
Examples |
Write some examples, then circle and label what changes…
examples:
_______________ (_________)is ________
_______________ (_________)is ________
_______________ (___________)is ________
_______________ (___________)is ________
end
Definition |
Write the definition, giving variable names to all your input values…
fun _____________(______):
__ask:
__| ___________ then: ______
__| _____________ then: ______
__| otherwise: __
__end
end
These materials were developed partly through support of the National Science Foundation,
(awards 1042210, 1535276, 1648684, and 1738598). 
Bootstrap:Algebra by Emmanuel Schanzer, Jen Poole, Ed Campos Jr, Flannery Denny, and Dorai Sitaram
is licensed under a
Creative Commons 4.0 Unported License.
Based on a work at www.BootstrapWorld.org.
Permissions beyond the scope of this license may be available by contacting
schanzer@BootstrapWorld.org.