When I'm writing a program, my approach is to "write a bit" and then "test a bit." I start with a small module with few functions, and then I compile… - Joe Armstrong

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When I'm writing a program, my approach is to "write a bit" and then "test a bit." I start with a small module with few functions, and then I compile it and test it with a few commands in the shell. Once I'm happy with it, I write a few more functions, compile them, test them, and so on. (page 60)