quietly: Wrap a function to capture side-effects

In purrr: Functional Programming Tools

Wrap a function to capture side-effects

Description

Create a modified version of .f that captures side-effects along with the return value of the function and returns a list containing the result, output, messages and warnings.

Usage

quietly(.f)

Arguments

.f	A function to modify, specified in one of the following ways: A named function, e.g. mean. An anonymous function, e.g. ⁠\(x) x + 1⁠ or function(x) x + 1. A formula, e.g. ~ .x + 1. Only recommended if you require backward compatibility with older versions of R.

Value

A function that takes the same arguments as .f, but returns a different value, as described above.

Adverbs

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.

See Also

Other adverbs: auto_browse(), compose(), insistently(), negate(), partial(), possibly(), safely(), slowly()

Examples

f <- function() {
  print("Hi!")
  message("Hello")
  warning("How are ya?")
  "Gidday"
}
f()

f_quiet <- quietly(f)
str(f_quiet())

purrr documentation built on Aug. 8, 2025, 7:38 p.m.