Referenced from lesson Defining Table Functions (Spring, 2021)
For the word problems below, assume dog-row, cat-row, young-row and old-row are already defined as data rows.
Directions: Define a function called is-cat, which consumes a Row of the animals table and computes whether the animal is a cat.
Contract and Purpose Statement |
Every contract has three parts…
# is-cat::Row->Boolean
# Consumes an animal, and computes whether the species equals "cat"
Examples |
Write some examples, then circle and label what changes…
examples:
__is-cat (dog-row) is____________________________
________ (_______) is____________________________
end
Definition |
Write the definition, giving variable names to all your input values…
fun is-cat(r):
__r["species"] == "cat"
end
Directions: Define a function called is-young, which consumes a Row of the animals table and computes whether it is less than four years old.
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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