Test whether an object is a single, non-empty character string

This function checks whether an object is a scalar character string that is not NULL, not NA, and not empty after trimming whitespace. The function relies on is_invalid() to detect unusable inputs such as NULL, zero-length vectors, and error objects.

Usage

is_char_scalar(x)

Arguments

x

Any R object to validate.

Value

TRUE if x is a single, non-missing, non-empty character string after trimming; otherwise FALSE.

Examples

is_char_scalar("hello")     # TRUE
#> [1] TRUE
is_char_scalar("  hi  ")    # TRUE
#> [1] TRUE
is_char_scalar("   ")       # FALSE
#> [1] FALSE
is_char_scalar("")          # FALSE
#> [1] FALSE
is_char_scalar(1)           # FALSE
#> [1] FALSE
is_char_scalar(NA)          # FALSE
#> [1] FALSE
is_char_scalar(NULL)        # FALSE
#> [1] FALSE