6. Development

Working software over comprehensive documentation

—The Agile Manifesto1

Figure 6-1: Newton’s Cradle is a common desktop toy. When you apply force from one end, the balls swing in a predictable regular motion. When you add a force from the opposite end, the balls start bouncing chaotically against each other. It is a metaphor for development practice. Simple, directional force encourages predictability, whereas contradictory forces can create chaos.

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This chapter is not about programming languages or design patterns. These important topics are well covered in many other books. Instead, this chapter is about getting that code into ...

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