Sha256: 8294af443544921c35038ae7e7df4e461f46db0fde1df83612d2a01c09881a42
Contents?: true
Size: 470 Bytes
Versions: 121
Compression:
Stored size: 470 Bytes
Contents
'use strict';
function ISBN(isbn) {
this.isbn = isbn.replace(/-/g, '');
this.isValid = function () {
if (!this.isbn.match(/^(\d{9}[\dX])$/)) {
return false;
}
var digits = this.isbn.split('');
if (digits[9] === 'X') {
digits[9] = 10;
}
var sum = digits.reduce(function (total, current, index) {
return total + ((10 - index) * parseInt(current, 10));
}, 0);
return sum % 11 === 0;
};
}
module.exports = ISBN;
Version data entries
121 entries across 121 versions & 1 rubygems