Andrew Treadway shows how to use the Map() and mapply() functions in R:
An older post on this blog talked about several alternative base apply functions. This post will talk about how to apply a function across multiple vectors or lists with Map and mapply in R. These functions are generalizations of sapply and lapply, which allow you to more easily loop over multiple vectors or lists simultaneously.
The idea of Map in functional programming takes a bit of time to really wrap your head around, but once you do, it becomes extremely powerful. H/T R-bloggers