Check if an argument is a single atomic value

Description

Check if an argument is a single atomic value

Usage

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

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

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

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

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

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

expect_scalar(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.

Details

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

Value

Depending on the function prefix: If the check is successful, the functions assertScalar/assert_scalar return x invisibly, whereas checkScalar/check_scalar and testScalar/test_scalar return TRUE. If the check is not successful, assertScalar/assert_scalar throws an error message, testScalar/test_scalar returns FALSE, and checkScalar returns a string with the error message. The function expect_scalar always returns an expectation.

See Also

Other scalars: checkCount, checkFlag, checkInt, checkNumber, checkScalarNA, checkString

Examples

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testScalar(1)
testScalar(1:10)

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