const isObject = obj => obj === Object(obj); const mapOptionToLink = (options, option) => options[option] !== false ? `${option}=${ isObject(options[option]) ? options[option].value : options[option] }&` : ""; export const createOlxLink = (category, subcategory, options) => subcategory.value ? Object.keys(options).reduce( (link, option) => link + mapOptionToLink(options, option), `kategorija=${subcategory.value}&` ) : "";