Sha256: baa8aa23ebed6c54f3137f021862946800488d255d1047f6294cab81278a7737
Contents?: true
Size: 390 Bytes
Versions: 124
Compression:
Stored size: 390 Bytes
Contents
export default class ISBN {
constructor(isbn) {
this.isbn = isbn.replace(/-/g, '');
}
isValid() {
if (!this.isbn.match(/^(\d{9}[\dxX])$/)) return false;
const digits = [...this.isbn];
if (digits[9].match(/[xX]/)) digits[9] = 10;
const sum = digits.reduce((acc, value, index) => acc + ((10 - index) * parseInt(value, 10)), 0);
return sum % 11 === 0;
}
}
Version data entries
124 entries across 124 versions & 1 rubygems