Local Storage getter/setter with expiration

storage.js

/**
 * Retrieves or stores a value inside local storage.
 * If only the first parameter is specified, the value is retrieved from local storage.
 * If a value to store is specified, maxAge must also be specified after which the value is
 * considered invalid and removed during successive retrievals.
 * @param name key name to set or retrieve
 * @param value value to store
 * @param maxAge number of hours until expiration
 */
function storage(name, value, maxAge) {
  if (value !== void 0) {
    var expires = new Date(Date.now() + maxAge * 3600000);

    window.localStorage.removeItem(name);
    window.localStorage.setItem(name, JSON.stringify({
      value: JSON.stringify(value),
      expires: expires.toUTCString()
    }));

    return value;
  }

  try {
    var obj = JSON.parse(window.localStorage.getItem(name));
    if (new Date(obj.expires) < new Date()) {
      window.localStorage.removeItem(name);
    }
    return JSON.parse(obj.value);
  } catch (e) { }
}