validISBN10.js

'use strict';

function validISBN10(isbn) {
  if(! /\d{9}[X0-9]/.test(isbn)) return false;
  return isbn.split('').reduce((p, c, i) => {
    return p + ((c == 'X') ? 10 : parseInt(c)) * ++i;
  }, 0) % 11 == 0;
}

(function (func, cases, invert) {
  cases.forEach(t =>
    console.log(func(t[0]) == t[1], `${func.name}(${t[0]}) == ${t[1]}`)
  );
})(validISBN10, [
  [ '1112223339', true ],
  [ '1234554321', true ],
  [ '1234512345', false ],
  [ '048665088X', true ]
]);