Afterword

This concludes this book on functional programming in R. You now know all the basic programming patterns used in day-to-day functional programming and how to use them in the R programming language.

Getting used to writing functional programs might take a little effort if you are only used to imperative or object-oriented programming, but the combination of higher-order functions and closures is a very powerful paradigm for effective programming, and writing pure functions whenever possible makes for code that is much simpler to reason with.

R is not a pure functional programming language, though, so your code will usually mix imperative programming—which in most cases means using loops instead of recursions, both for convenience and efficiency ...

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