Assessment and Cataloging

check_isbn_10_check_digit

R Documentation

Check the check digit of an ISBN 10

Description

Takes a string representation of an ISBN 10 and verifies that check digit checks out

Usage

check_isbn_10_check_digit(x, allow.hyphens = TRUE, errors.as.false = TRUE)

Arguments

`x`	A string of 10 digits or 9 digits with terminal "X"
`allow.hyphens`	A logical indicating whether the hyphen separator should be allowed (default is `FALSE`)
`errors.as.false`	return false if error instead of throwing error (default is `TRUE`)

Value

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

Examples


check_isbn_10_check_digit("012491540X")      # TRUE
check_isbn_10_check_digit("0-124-91540-X")   # TRUE

# vectorized
check_isbn_10_check_digit(c("012491540X", "9004037812"))  # TRUE FALSE

NYPL/libbib documentation built on Feb. 6, 2024, 4:19 a.m.