View source: R/adverb-compose.R
Create a new function that is the composition of multiple functions,
compose(f, g) is equivalent to
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.
Dynamic dots are supported. In particular, if
your functions are stored in a list, you can splice that in with
This function is called an adverb because it modifies the effect of a function (a verb). If you'd like to include a function created an adverb in a package, be sure to read faq-adverbs-export.
not_null <- compose(`!`, is.null) not_null(4) not_null(NULL) add1 <- function(x) x + 1 compose(add1, add1)(8) fn <- compose(\(x) paste(x, "foo"), \(x) paste(x, "bar")) fn("input") # Lists of functions can be spliced with !!! fns <- list( function(x) paste(x, "foo"), \(x) paste(x, "bar") ) fn <- compose(!!!fns) fn("input")
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