Verify ISBN string format and check digit


Examples

``JavaScript
import IsbnVerify from '@w0s/isbn-verify';

const isbnVerify1 = new IsbnVerify('978-4-06-519981-0'); // ISBN with correct format but wrong check digit
isbnVerify1.isValid(); // false
isbnVerify1.isIsbn10(); // false
isbnVerify1.isIsbn10({ check_digit: true }); // false
isbnVerify1.isIsbn13(); // true
isbnVerify1.isIsbn13({ check_digit: true }); // false
isbnVerify1.verify(); // true
isbnVerify1.verify({ check_digit: true }); // false

const isbnVerify2 = new IsbnVerify('9784065199817');
isbnVerify2.isValid(); // true

const isbnVerify3 = new IsbnVerify('9784065199817', { strict: true });
isbnVerify3.isValid(); // false
`

Constructor

`TypeScript
constructor(isbn: string, options?: Option)
`

$3

isbn [Required]

ISBN value

options [Optional]

See below for details

$3

`TypeScript
interface Option {
strict?: boolean; // If true, syntax without hyphens is an error. If not specified, it defaults to false
}
`

Methods

isValid(): boolean

Verify both format and check digit (Alias of verify({ check_digit: true }))

isIsbn13(options?: VerifyOption): boolean

Whether it is a current standard (13 digit) ISBN or not

isIsbn10(options?: VerifyOption): boolean

Whether it is a old standard (10 digit) ISBN or not

verify(options?: VerifyOption): boolean

Verify format, optionally check digit

$3

`TypeScript
interface VerifyOption {
check_digit?: boolean; // Verify format including check digit
}
``