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Learning Processing, 2nd Edition by Daniel Shiffman

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6

Loops

Repetition is the reality and the seriousness of life.

—Soren Kierkegaard

What’s the key to comedy? Repetition. What’s the key to comedy? Repetition.

—Anonymous

In this chapter:

 The concept of iteration

 Two types of loops: while and for. When do you use them?

 Variable scope: local vs. global

 Iteration in the context of computer graphics

6-1 What is iteration? I mean, what is iteration? Seriously, what is iteration?

Iteration is the generative process of repeating a set of rules or steps over and over again. It’s a fundamental concept in computer programming and you will soon come to discover that it makes your life as a coder quite delightful. Let’s begin.

For the moment, think about legs. Lots and lots of legs on little Zoog. If you had only ...

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