/**
 * Filters an array of objects by custom predicates.
 *
 * @param  {Array}  array: the array to filter
 * @param  {Object} filters: an object with the filter criteria
 * @return {Array}
 */
function filterArray(array, filters) {
  const filterKeys = Object.keys(filters);
  return array.filter(item => {
    // validates all filter criteria
    return filterKeys.every(key => {
      // ignores non-function predicates
      if (typeof filters[key] !== 'function') return true;
      return filters[key](item[key]);
    });
  });
}