is_isbn_code

is_isbn10_code

is_isbn13_code

assert_all_are_isbn_codes

assert_any_are_isbn_codes

Lots of predicates (is_* functions) to check the state of your
variables, and assertions (assert_* functions) to throw errors if they
aren't in the right form.

Richard Cotton

assertive

Readable Check Functions to Ensure Code Integrity

is_isbn_code function

is_isbn_code: Does the character vector contain ISBN book codes?

Description

Arguments