CHAPTER 4
Functional Programming in Scala
In the non-fiction work Old Times on the Mississippi, Mark Twain wrote: “When I was a boy of 14, my father was so ignorant I could hardly stand to have the old man around. But when I was 21, I was astonished at how much the old man had learned in seven years”. Functional programming is the old man that comes to the rescue when writing robust concurrent software. Functional programming treats computation as the evaluation of mathematical functions and avoids state and mutable data. It is a declarative programming paradigm, in which programming is done with expressions. The imperative style of programming ...
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