To hear some people talk about functional programming, you'd think they'd joined some kind of cult. They prattle on about how it's changed the way they think about code. They'll extol the benefits of purity, at length. And proclaim that they are now able to “reason about their code”—as if all other code is irrational and incomprehensible. It's enough to make anyone skeptical. Still, one has to wonder. There must be a reason these zealots get so worked up. What are they so excited about?

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The new book, "A skeptic’s guide to functional programming with JavaScript, is due for release soon. The book is a sample chapter from the book Design Patterns: Elements of Reusable Object-Oriented Software.

What’s so great about functional programming anyway?

<p>Few minutes in and I am enjoying the article already… 😃</p>


<p>It’s a mild shame they are confusing what algebraic data structures are with type classes.</p>
