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Questions for Chapter 10
1) List two built-in properties of an object that are indirectly changed by instructions such as
move or turn to face.
2) Which button in the details pane of an object allows you to create your own property for
an object?
3) Which instruction can be used to directly change the value of a property?
4) What does it mean to say that a variable is mutable?
5) List two ways to modify a class and save it out as a new class.
6) What is the difference between a class-level variable and a world-level variable?
The difference is the same as the difference between a class-level method and a world-
7) In what way(s) is an array similar to a list (as described in Chapter 9)?
8) What is the purpose of an index variable in an array?
The index variable is used to keep track of where each element is positioned in the
9) In Alice, an arrayVisualization may be created by clicking on the arrayVisualization
thumbnail image in the Visualizations folder of the Gallery. If you add an
arrayVisualization to your world, is it an object or an array? Explain your answer.
10) Name the built-in method for an arrayVisualization that allows your program to access
an individual element in the array being visualized.
