Directions: Use the Design Recipe to write a function update-danger, which takes in the danger’s x- and y-coordinate and produces the next x-coordinate, which is 50 pixels to the left.
Contract and Purpose Statement |
Every contract has three parts…
_____________::______________->______
________________________________________________________________
Examples |
Write some examples, then circle and label what changes…
examples:
_____________ (________) is ________
_____________ (_______) is ________
end
Definition |
Write the definition, giving variable names to all your input values…
fun _____________(____):
______
end
Directions: Use the Design Recipe to write a function update-target, which takes in the target’s x- and y-coordinate and produces the next x-coordinate, which is 50 pixels to the right.
Contract and Purpose Statement |
Every contract has three parts…
_____________::______->______
_______________________________________________________________
Examples |
Write some examples, then circle and label what changes…
examples:
_____________ (________) is ________
_____________ (________) is ________
end
Definition |
Write the definition, giving variable names to all your input values…
fun _____________(_):
______
end
These materials were developed partly through support of the National Science Foundation,
(awards 1042210, 1535276, 1648684, and 1738598). 
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