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.

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.

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

## Examples

f <- function() {
print("Hi!")
message("Hello")
warning("How are ya?")
"Gidday"
}
f()
#> [1] "Hi!"
#> Hello
#> Warning: How are ya?
#> [1] "Gidday"

f_quiet <- quietly(f)
str(f_quiet())
#> List of 4
#>  $result : chr "Gidday" #>$ output  : chr "[1] \"Hi!\""
#>  $warnings: chr "How are ya?" #>$ messages: chr "Hello\n"