Compose multiple functions
Compose multiple functions
compose(..., .dir = c("backward", "forward"))... |
Functions to apply in order (from right to left by default). Formulas are converted to functions in the usual way. These dots support tidy dots features. In
particular, if your functions are stored in a list, you can
splice that in with |
.dir |
If |
A function
not_null <- compose(`!`, is.null)
not_null(4)
not_null(NULL)
add1 <- function(x) x + 1
compose(add1, add1)(8)
# You can use the formula shortcut for functions:
fn <- compose(~ paste(.x, "foo"), ~ paste(.x, "bar"))
fn("input")
# Lists of functions can be spliced with !!!
fns <- list(
function(x) paste(x, "foo"),
~ paste(.x, "bar")
)
fn <- compose(!!!fns)
fn("input")Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.