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A Definition Of Functional Programming

Kevin Sookocheff contrasts functional programming with its imperative cousin:

Functional programming is a form of declarative programming that expresses a computation directly as pure functional transformation of data. A functional program can be viewed as a declarative program where computations are specified as pure functions.

I think that if you’re a set-based SQL developer, functional programming languages will make the most intuitive sense.  They’re a bit harder to wrap your mind around if you’ve grown up as an imperative C-style developer, but are still worth the effort.