This page refers to the Table Functions Starter File.
Filtering Rows
1 What does filter(shapes-table, is-red) evaluate to? Describe the value you get back below.
2 What does filter(shapes-table, is-polygon) evaluate to? Describe the value you get back below.
3 Write the code to generate a table of only triangles.
4 In the Definitions Area, define triangles by writing triangles = filter(shapes-table, is-triangle). Click "Run" and evaluate triangles in the Interactions Area.
5 Define reds to be a table of only red shapes.
6 What do the contracts for is-red, is-polygon, and is-triangle have in common?
7 Find the Contract for filter on the Contracts Page. If you’re working with a printed workbook, the contracts pages are included in the back. Explain how filter uses the two inputs specified in the Domain.
8 What happens if you evaluate filter(shapes-table, lookup-name)? Why?
Building Columns
9 What does build-column(shapes-table, "red", is-red) evaluate to?
10 What does build-column(shapes-table, "img", draw-shape) evaluate to?
11 Find the Contract for build-column on the Contracts Page. If you’re working with a printed workbook, the contracts pages are included in the back.Explain how build-column uses the three inputs specified in the Domain.
Challenge!
★ In the Definitions Area, define a table of your own using filter or build-column. Add a comment to describe what’s in it!
These materials were developed partly through support of the National Science Foundation, (awards 1042210, 1535276, 1648684, 1738598, 2031479, and 1501927). 
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