Referenced from lesson Data Displays and Lookups

Consider the table below, and the four value definitions that follow:

shapes-table

name corners is-round

"triangle"

3

false

"square"

4

false

"rectangle"

4

false

"circle"

0

true

 
shapeA = shapes-table.row-n(0)
shapeB = shapes-table.row-n(1)
shapeC = shapes-table.row-n(2)
shapeD = shapes-table.row-n(3)

1) Match each Pyret expression (left) to the description of what it evaluates to (right).

shapeD

1

A

Evaluates to 4

shapeA

2

B

Evaluates to the last row in the table

shapeB["corners"]

3

C

Evaluates to "square"

shapeC["is-round"]

4

D

Evaluates to true

shapeB["name"]

5

E

Evaluates to false

shapeA["corners"]

6

F

Evaluates to 3

shapeD["name"] == "circle"

7

G

Evaluates to the first row in the table

2) Fill in the blanks (left) with the Pyret lookup code that will produce the value (right).

a.

"rectangle"

b.

"square"

c.

4

d.

0

e.

true

These materials were developed partly through support of the National Science Foundation, (awards 1042210, 1535276, 1648684, and 1738598). CCbadge Bootstrap:Data Science by Emmanuel Schanzer, Nancy Pfenning, Emma Youndtsmith, Jennifer Poole, Shriram Krishnamurthi, Joe Politz, Ben Lerner, Flannery Denny, and Dorai Sitaram with help from Eric Allatta and Joy Straub is licensed under a Creative Commons 4.0 Unported License. Based on a work at www.BootstrapWorld.org. Permissions beyond the scope of this license may be available by contacting schanzer@BootstrapWorld.org.