Function Composition in R (and high level functions)

Question

Is there something like a function composition in R?

I think in haskell it's somthing like "(.)" and in agda it's the ring operator.

Also, I find litte information on high level functional programming in R. I found the Functions "Reduce", "Map", "Filter"..., are there more? Any pointers?

Answer 1

The functional package has a Compose functional which generalizes to any number of functions:

set.seed(123)
x <- matrix(runif(100), 10, 10)
mean(rowSums(scale(x)))
# [1] 5.486063e-18

library(functional)
Compose(scale, rowSums, mean)(x)
# [1] 5.486063e-18

(Note that the functions are applied from left to right.)