chk (version 0.10.0)

chk_function: Check Function

Description

Checks if is a function using

is.function(x) && (is.null(formals) || length(formals(x)) == formals)

Usage

chk_function(x, formals = NULL, x_name = NULL)
vld_function(x, formals = NULL)

Value

The chk_ function throws an informative error if the test fails or returns the original object if successful so it can used in pipes.

The vld_ function returns a flag indicating whether the test was met.

Arguments

x

The object to check.

formals

A count of the number of formal arguments.

x_name

A string of the name of object x or NULL.

Functions

• vld_function(): Validate Function

See Also

is.function() formals()

For more details about the use of this function, please read the article vignette("chk-families").

Other missing_checkers: chk_missing(), chk_not_missing()

Examples

# chk_function
chk_function(mean)
try(chk_function(1))
# vld_function
vld_function(mean)
vld_function(function(x) x)
vld_function(1)
vld_function(list(1))