inspect_true_or_false: Validate non-missing logical values
In inspector: Validation of Arguments and Objects in User-Defined Functions

Description Usage Arguments Details Value See Also Examples

inspect_true_or_false checks if an object is a non-missing logical vector of length 1. This can be useful to validate inputs in user-defined functions.

1	inspect_true_or_false(x)

`x`	An arbitrary object.

inspect_true_or_false conducts a series of tests to check if x is a non-missing logical vector of length 1. Namely, inspect_true_or_false checks if:

x is NULL or empty.
x is an atomic vector of length 1.
The typeof x is logical.
x is NA or NaN.

inspect_true_or_false does not return any output. There are two possible scenarios:

The call is silent if x is a non-missing logical vector of length 1.
An informative error message is thrown otherwise.

inspect_character to validate character vectors.
inspect_character_match to validate character vectors with predefined allowed values.

# Calls that pass silently:
x <- TRUE
y <- FALSE
inspect_true_or_false(x)
inspect_true_or_false(y)

# Calls that throw informative error messages:
mylist <- list(NULL, NA, NaN, 1, 0, "TRUE")
try(inspect_true_or_false(mylist[[1]]))
try(inspect_true_or_false(mylist[[2]]))
try(inspect_true_or_false(mylist[[3]]))
try(inspect_true_or_false(mylist[[4]]))
try(inspect_true_or_false(mylist[[5]]))
try(inspect_true_or_false(mylist[[6]]))