CHAPTER 5
Functional Programming
The longer one programs, the easier it becomes to think like a programmer. You learn that the best way to solve a problem is to solve it once in such a way that the adjustments you need to make when the problem changes slightly are very small ones. It is better to use variables and even other functions in your code so that you can change a single value once rather than many times. This is the essence of the pragmatic programmer who writes with purpose. Programmers who come to R from other languages such as C++ or Python tend to think in loops. You are probably convinced by now that R’s vectorization allows us ...
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