[apathy]

With dplyr & purrr, if you can't find a DSL in R that works for you, the odds are you'll need lisp or Haskell to satisfy you.

[peatmoss]

With the Apache Arrow project, my understanding is that there will be an opportunity for languages like R, Python w/Pandas to share in-memory dataframe structures. I could imagine a future world where much tighter interaction with languages like lisps or Haskell.

[lallysingh]

Haskell is what I use.