Take a look at the questions with the functional tag. In my opinion, most of them should be re-tagged with functional-programming. Functional-programming is much larger, has a nice wiki page, and is less ambiguous. The few questions which wouldn't be appropriate for functional-programming fit nicely under more specific tags such as functional-testing.
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closed as off-topic by random, Aditya, Rory, Shadow Wizard, CRABOLO Jul 15 '14 at 20:46
This question appears to be off-topic. The users who voted to close gave this specific reason:
I don't know what functional is supposed to be about, and considering the wide range of questions that use it, no one seems to know. Nuke it!
While you're at it, non-functional can probably go too.