In infix and prefix forms.
compose(...) f %.% g
This function was from hadley wickham's package pryr, for more details see https://github.com/hadley/pryr
not_null <- `!` %.% is.null not_null(4)#> [1] TRUEnot_null(NULL)#> [1] FALSEadd1 <- function(x) x + 1 compose(add1,add1)(8)#> [1] 10