Each of those languages has its downside: * Ruby and its clones are declining as their signature frameworks (Rails, Grails, etc) are replaced by newer ones lik

Each of those languages has its downside: * Ruby and its clones are declining as their signature frameworks (Rails, Grails, etc) are replaced by newer ones like Node, Go Http, etc * Python has the version 2 or 3 problem for now * Javascript is too complicated I think in 20 years time when the dynamic language fad has well passed, like the 4GL fad before it, there'll only be 2 dynamic languages left in the market, just as the 4GL's dwindled to only Visual Basic and perhaps Delphi. They'll be Python 3 and Javascript, so choose one of those.