test_farg: Test whether function has certain arguments

In dipsaus: A Dipping Sauce for Data Analysis and Visualizations

Test whether function has certain arguments

Description

Test whether function has certain arguments

Usage

test_farg(fun, arg, dots = TRUE)

Arguments

fun	function
arg	characters of function arguments
dots	whether fun's dots (...) counts

Examples

a <- function(n = 1){}

# Test whether `a` has argument called 'b'
test_farg(a, 'b')

# Test whether `a` has argument called 'b' and 'n'
test_farg(a, c('b', 'n'))

# `a` now has dots
a <- function(n = 1, ...){}

# 'b' could goes to dots and a(b=...) is still valid
test_farg(a, 'b')

# strict match, dots doesn't count
test_farg(a, 'b', dots = FALSE)

dipsaus documentation built on July 9, 2023, 5:43 p.m.