function listCacheGet(key) {
  var data = this.__data__,
      index = assocIndexOf(data, key);

  return index < 0 ? undefined : data[index][1];
}
Gets the list cache value for `key`.

@private
@name get
@memberOf ListCache
@param {string} key The key of the value to get.
@returns {*} Returns the entry value.