Check if an argument is a flag

A flag is defined as single logical value.

Usage

checkFlag(x, na.ok = FALSE, null.ok = FALSE)

check_flag(x, na.ok = FALSE, null.ok = FALSE)

assertFlag(x, na.ok = FALSE, null.ok = FALSE, .var.name = vname(x), add = NULL)

assert_flag(
  x,
  na.ok = FALSE,
  null.ok = FALSE,
  .var.name = vname(x),
  add = NULL
)

testFlag(x, na.ok = FALSE, null.ok = FALSE)

test_flag(x, na.ok = FALSE, null.ok = FALSE)

expect_flag(x, na.ok = FALSE, null.ok = FALSE, info = NULL, label = vname(x))

Arguments

x

[any]
Object to check.

na.ok

[logical(1)]
Are missing values allowed? Default is FALSE.

null.ok

[logical(1)]
If set to TRUE, x may also be NULL. In this case only a type check of x is performed, all additional checks are disabled.

.var.name

[character(1)]
Name of the checked object to print in assertions. Defaults to the heuristic implemented in vname.

add

[AssertCollection]
Collection to store assertion messages. See AssertCollection.

info

[character(1)]
Extra information to be included in the message for the testthat reporter. See expect_that.

label

[character(1)]
Name of the checked object to print in messages. Defaults to the heuristic implemented in vname.

Value

Depending on the function prefix: If the check is successful, the functions assertFlag/assert_flag return x invisibly, whereas checkFlag/check_flag and testFlag/test_flag return TRUE. If the check is not successful, assertFlag/assert_flag throws an error message, testFlag/test_flag returns FALSE, and checkFlag/check_flag return a string with the error message. The function expect_flag always returns an expectation.

Details

This function does not distinguish between NA, NA_integer_, NA_real_, NA_complex_ NA_character_ and NaN.

See also

Other scalars: checkCount(), checkInt(), checkNumber(), checkScalar(), checkScalarNA(), checkString()

Examples

testFlag(TRUE)
#> [1] TRUE
testFlag(1)
#> [1] FALSE