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Check NULL

Source: R/chk-null.R
chk_null.Rd

Checks if NULL using

is.null(x)

Usage

chk_null(x, x_name = NULL)

vld_null(x)

Arguments

x

The object to check.

x_name

A string of the name of object x or 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.

Functions

  • vld_null(): Validate NULL

See also

Other chk_nulls: chk_not_null()

Examples

# chk_null
try(chk_null(1))
#> Error in eval(expr, envir) : `1` must be NULL.
chk_null(NULL)
# vld_null
vld_null(NULL)
#> [1] TRUE
vld_null(1)
#> [1] FALSE