Function parseYear

services/isbn/openLibrary.js:42–46

* Parse the Open Library publish date into a proper year number. * * @param {string} publishDate The Open Library publish date. * @returns A parsed year as a number if it matches

(publishDate)

 * @returns A parsed year as a number if it matches
 */
function parseYear(publishDate) {
  const match = publishDate && publishDate.match(/\d{4}/)[0];

  return match ? parseInt(match, 10) : null;
}

/**
 * Search for book details into the Open Library database.