To help you with this page, we’ve re-printed the Contract for the text function, and an example of how to use it.
(Remember, you can always refer to the Contracts Pages. If you’re working with a printed workbook, they are included in the back.)
# text :: (Stringmessage, Numbersize, Stringcolor) -> Image
text("hello", 24, "green")
1 On the three lines below, write the code to lookup the value of the species column from dog-row, old-row, and young-row.
2 On the three lines below, write the code that uses the text function to show the species of those same three rows in red, 15px letters.
3 Check with your partner or another student. Do you have the same code? Why or why not?
Instead of writing this out over and over for each animal, let’s define a function to do it for us!
Defining the Function
Define a function called species-tag, which takes in a row from the Animals Table and draws its name in red, 15px letters. HINT: Use of the rows from above in your examples!
Contract and Purpose Statement |
Every contract has three parts…
species-tag::Row->Image
_
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 species-tag(_):
_____________________________
end
These materials were developed partly through support of the National Science Foundation, (awards 1042210, 1535276, 1648684, 1738598, 2031479, and 1501927). 
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