Get the List of Arguments of a Function in R Programming – args() Function

args() function in R Language is used to get the required arguments by a function. It takes function name as arguments and returns the arguments that are required by that function.

Syntax: args(name)

Parameters:
name: Function name

Returns:

• For a closure: Formal Argument list but with NULL body
• For a Primitive Function: A closure with usage and a NULL body
• For a non-function: NULL in case of not a function.

Example 1:

# R program to get arguments of a function

# Calling args() Function
args(append)
args(sin)
args(paste)

Output:

function (x, values, after = length(x)) 
NULL
function (x) 
NULL
function (..., sep = " ", collapse = NULL) 
NULL

Example 2:

# R program to get arguments of a function

# Calling args() Function
args(1)
args(10)

Output:

NULL
NULL

The above code returns NULL because the names passed to args() function are not actual functions.