has_arg: Does the current call have an argument?

In assertive.code: Assertions to Check Properties of Code

Does the current call have an argument?

Description

Checks to see if the current call has an argument with the name given in the input.

Usage

assert_has_arg(
  x,
  fn = sys.function(sys.parent()),
  severity = getOption("assertive.severity", "stop")
)

has_arg(x, fn = sys.function(sys.parent()))

has_arg_(x, fn = sys.function(sys.parent()))

Arguments

x	Argument to check.
fn	Function to find the argument in.
severity	How severe should the consequences of the assertion be? Either "stop", "warning", "message", or "none".

Value

has_arg reimplements hasArg, letting you choose the function to search in, and providing more information on failure.

Note

has_arg is for interactive use and takes an unquoted argument name; has_arg_ is for programmatic use and takes a string naming a argument.

See Also

hasArg.

Examples

has_arg(x, mean.default)
has_arg(y, mean.default)   
f <- function(...) has_arg(z)   
f(z = 123)
f(123)

assertive.code documentation built on May 31, 2023, 5:35 p.m.