libbib (version 1.6.4)

check_isbn_13_check_digit: Check the check digit of an ISBN 13

Description

Takes a string representation of an ISBN 13 and verifies that check digit checks out

Usage

check_isbn_13_check_digit(x, allow.hyphens = TRUE, errors.as.false = TRUE)

Value

Returns TRUE if check passes, FALSE if not, and NA if NA

Arguments

x

A string of 13 digits

allow.hyphens

A logical indicating whether the hyphen separator should be allowed (default is TRUE)

errors.as.false

return false if error instead of throwing error (default is TRUE)

Examples

check_isbn_13_check_digit("9780306406157")          # TRUE
check_isbn_13_check_digit("978-0-306-40615-7")      # TRUE

# vectorized
check_isbn_13_check_digit(c("978-0-306-40615-7", "9783161484103"))  # TRUE FALSE