Nerval's Lobster writes
In theory, learning less-popular programming languages could end up paying off big—provided the programmers who pursue them play their proverbial cards right. And as with any good card game, there's a considerable element of chance involved: In order to land a great job, you need to become an expert in a language, which involves a considerable amount of work with no guarantee of a payoff. With that in mind, do you think it's worth learning R, Scala, Haskell, Clojure, or even COBOL (the lattermost is still in use among companies with decades-old infrastructure, and they reportedly have trouble filling jobs that rely on it)? Or is it better to devote your precious hours and memory to popular, much-used languages that have a lot of use out there?

Link ~> http://classic.slashdot.org/story/14/09/09/152236