Open the Animals Starter File and click "Run". In the Interactions Area (right), type animals-table. Hit "Enter" to see the default view of the table.
Ordering a Table with sort
1 Mabel Lee wants to sort this table by age (youngest-to-oldest). Juan Carlos wants to sort the table by pounds(heaviest-to-lightest). What are some other ways we could sort the table?
a.
b.
Pyret has a function called sort that will produce sorted Tables!
2 Test out sort(animals-table, "age", true) in the Interactions Area. Try using false instead of true.
Complete the sentences below by circling the behavior you observed for each Boolean.
(a) |
in ascending order (from least to greatest) |
in descending order (from largest to smallest) |
(b) |
in ascending order (from least to greatest) |
in descending order (from largest to smallest) |
3 The Domain of sort has three inputs. One of them is the table itself. Can you identify the data types of the other two?
# sort :: (Tabletable-name, column-name, order) -> Table
4 What code will sort the animals by alphabetical order of their names?
5 Did you use true or false? Explain why.
Summarizing a Column with count
Let’s explore another table function, beginning with its contract:
# count :: Table, String -> Table
6 What do you expect the code count(animals-table, "legs") to produce?
 Type the code into the Interactions Area and click "Enter" to test it out.
7 How many animals had 4 legs?
8 Think of another question you might be able to answer by making a different table using the count function.
9 Fill in the blanks with the code to make the table: function-name (table-name :: Table, column-name :: String)
10 Try using the count function to summarize the pounds column. Is the resulting summary useful? Why or why not?
11 Tables that summarize data with a count are commonly used in the real world. Write an example of where you’ve seen them before:
12 Newspapers often incorporate data into their reporting. How else might they display this information, besides using a table?
These materials were developed partly through support of the National Science Foundation, (awards 1042210, 1535276, 1648684, 1738598, 2031479, and 1501927). 
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