I am currently in Learning phase of DATA Science. I have used R(More Proficient) and Python extensively for my Current Data Science Projects. Well i can say R is more of a functional language than one would think, but it's certainly not a great general purpose language. So as of now I have used R as Functional Programming For Descriptive analysis and on top of it used python for Making Data Science/Analytics Application, but aging there is a library name "Shiny" Which makes R programmer to make web App so easy as writting code for Descriptive analysis in R. And i am also interested in getting finger tight with Haskell and Julia.