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Art of Unix Programming, The by Eric Steven Raymond

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4. Modularity: Keeping It Clean, Keeping It Simple

There are two ways of constructing a software design. One is to make it so simple that there are obviously no deficiencies; the other is to make it so complicated that there are no obvious deficiencies. The first method is far more difficult.

The Emperor’s Old Clothes, CACM February 1981 —C. A. R. Hoare

There is a natural hierarchy of code-partitioning methods that has evolved as programmers have had to manage ever-increasing levels of complexity. In the beginning, everything was one big lump of machine code. The earliest procedural languages brought in the notion of partition by subroutine. Then we invented service libraries to share common utility functions among multiple programs. Next, ...

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