if i like Ruby a lot, is there a reason I should learn another language now, such as Lua or Erlang?
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8if i like Ruby a lot, is there a reason I should learn another language now, such as Lua or Erlang?
New programming languages, much like spoken languages, can open up new perspectives. Learning new languages -- especially ones rather different from what you're used to (and Erlang will probably fit that bill) -- can teach you a lot of different things you didn't even know you didn't know about programming. So yes, I think you absolutely should, even if you just learn enough to tinker with it and get a feel for the new language.
On the other hand, there's something to be said for really knowing a language well. You'll be able to do a lot more with in-depth knowledge of a single language than you will with surface knowledge of a dozen.
Learning a functional language in particular can be extremely beneficial. Becoming familiar with the functional style of programming is a surefire step toward becoming a better programmer. Lisp (or its derivatives) in particular is a good language to study. Here's a list of past thread on SO that might offer you some insight along these lines:
I always enjoy learning new languages for the mere challenge of it. It keeps my brain fit. I've also found it makes for good job interview fodder to be able to say "I'm flexible. I'm adaptable to whatever your needs may be in the future. And I can prove it with my long list of languages."
If you like Ruby a lot you should definitely learn another language... one without sigils if possible.
My main language is PHP. I am a script language fan, nevertheless I have dived into C#, Java, Python, Ruby and even OO JavaScript books to find new mechanisms, ways of thinking. I have found pretty many stunts in Java for example, that I could implement in my all day work. So learning or just studying new languages can widen your perspective.
Seems to me that a professional learns the tools he needs to use. Frameworks, containers, languages, all are fair game. I started out in Pascal, went to C and then C++. Then converted to Java. These days its mostly Java with a lot of Javascript and some PHP. Easy enough right? Well, I also need to learn Bash scripting and Perl. Never mind all the other crap I need to get on top of (if you say you understand all of web authentication I will call you a liar). There's a lot of stuff out there. Jump in. Be willing to try different things.