If you're doing a simulation, for instance, and you're missing a piece of functionality available in R, you can bring in just that piece. D's a nice language, a

If you're doing a simulation, for instance, and you're missing a piece of functionality available in R, you can bring in just that piece. D's a nice language, and if you decide you want to use it, it's great to know that every line of R code you've ever written and every R library you've ever called is still available.