“Any fool can write code that a computer can understand. Good programmers write code that humans can understand.”

Source: Refactoring: Improving the Design of Existing Code, 1999, p. 15

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Martin Fowler18

British programmer 1963

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Source: Refactoring: Improving the Design of Existing Code, 1999, p. 15

“Real programmers can write assembly code in any language.”

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“Ugly programs are like ugly suspension bridges: they're much more liable to collapse than pretty ones, because the way humans (especially engineer-humans) perceive beauty is intimately related to our ability to process and understand complexity. A language that makes it hard to write elegant code makes it hard to write good code.”

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But if the program is free, the teacher can explain what he knows, and then give out copies of the source code, saying: “Read it and you'll understand everything.” And those who are really fascinated, they will read it! And this gives them an opportunity to start to learn how to be good programmers.
To learn to be a good programmer, you'll need to recognize that certain ways of writing code, even if they make sense to you and they are correct, they're not good because other people will have trouble understanding them. Good code is clear code that others will have an easy time working on when they need to make further changes.
How do you learn to write good clear code? You do it by reading lots of code, and writing lots of code. Well, only free software offers the chance to read the code of large programs that we really use. And then you have to write lots of code, which means you have to write changes in large programs.
How do you learn to write good code for the large programs? You have to start small, which does not mean small program, oh no! The challenges of the code for large programs don't even begin to appear in small programs. So the way you start small at writing code for large programs is by writing small changes in large programs. And only free software gives you the chance to do that.”

Richard Stallman (1953) American software freedom activist, short story writer and computer programmer, founder of the GNU project

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“(To the extent that anyone but a Prolog programmer can understand \X totally. (And to the extent that a Prolog programmer can understand 'cut'.)”

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“Frameworks are white boxes to those that make use of them. Application developers must be able to quickly understand the structure of a framework, and how to write code that will fit into the framework. Frameworks are reusable designs as well as reusable code.”

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“Any fool can know. The point is to understand.”

Albert Einstein (1879–1955) German-born physicist and founder of the theory of relativity

“Computers are not very smart. They don't understand human language, so we have to tell them what to do in a language that both humans and computers can understand.”

Yukihiro Matsumoto (1965) Japanese computer scientist

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Marshall McLuhan (1911–1980) Canadian educator, philosopher, and scholar-- a professor of English literature, a literary critic, and a …

Source: 1960s, Understanding Media (1964), p. 80

“Any fool can write code that a computer can understand. Good programmers write code that humans can understand.”

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Martin Fowler18

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