Referenced from lesson Defining Table Functions
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). 
Bootstrap:Data Science by the Bootstrap Community is licensed under a Creative Commons 4.0 Unported License. This license does not grant permission to run training or professional development. Offering training or professional development with materials substantially derived from Bootstrap must be approved in writing by a Bootstrap Director. Permissions beyond the scope of this license, such as to run training, may be available by contacting contact@BootstrapWorld.org.