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A variable is a container that you can store
a value in. When you use that variable in
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an algorithm, it opens up the container and
looks at the value inside. This lets you write
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smarter algorithms that behave differently
depending on the value stored in the variable.
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Now you're going to try playlab where you
are given different games and you can change
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the values of variables like speed, height,
score, in order to change the game. You won't
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have to change the algorithm of the game to
change how it plays, just the variable. In
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my work for Kindle and on X-ray for books,
we apply variables in many different ways.
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One way that you can use a variable is to
store page numbers of a book. A user can increase
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and decrease the size of the font on a page.
Based on the font size, the number of pages
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in the book can change. We can adjust it by
storing the number of pages in the variable.
