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Questions and Answers
What is the purpose of the select-columns function?
What is the purpose of the select-columns function?
- To modify the existing columns in a table
- To extract a specific column from an existing table
- To create a new table with all columns from an existing table
- To create a new table with certain columns from an existing table (correct)
How can the tickcount column be extracted from a table?
How can the tickcount column be extracted from a table?
- Using the modify-column function.
- Using the get-column function. (correct)
- Using the select-columns function.
- Using the get-row function.
What is an extracted column?
What is an extracted column?
- A basic kind of datum called a list. (correct)
- A table with only one column.
- A column that has been deleted from a table
- A column that has been renamed in a table
What is a list in Pyret?
What is a list in Pyret?
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What is an anonymous list?
What is an anonymous list?
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What is a literal list in Pyret?
What is a literal list in Pyret?
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What can be done with lists in Pyret?
What can be done with lists in Pyret?
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Study Notes
- The select-columns function produces a new table with certain columns from an existing table.
- The tickcount column can be extracted using the get-column function.
- An extracted column is a more basic kind of datum called a list.
- A list has an order and all elements are expected to have the same type.
- A list does not have a column name and is anonymous.
- Lists can be used in several different contexts and can be interpreted differently.
- Literal lists can be created directly using [list: ].
- An empty list can be created using [list: ].
- Pyret provides built-in operations on lists of numbers.
- Useful functions can be included by including libraries.
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