Extract arguments from a call

call_args(call)

call_args_names(call)

Arguments

call

Can be a call or a quosure that wraps a call.

Value

A named list of arguments.

Life cycle

In rlang 0.2.0, lang_args() and lang_args_names() were soft-deprecated and renamed to call_args() and call_args_names(). See lifecycle section in call2() for more about this change.

See also

Examples

call <- quote(f(a, b)) # Subsetting a call returns the arguments converted to a language # object: call[-1]
#> a(b)
# On the other hand, call_args() returns a regular list that is # often easier to work with: str(call_args(call))
#> List of 2 #> $ : symbol a #> $ : symbol b
# When the arguments are unnamed, a vector of empty strings is # supplied (rather than NULL): call_args_names(call)
#> [1] "" ""