old-web/frontend-react/src/utils/createOlxLink.js

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) => {
  const deepSubCategory =
    Boolean(Object.keys(subcategory).length) &&
    subcategory[
      Object.keys(subcategory).reduce((max, key) => (max < key ? key : max))
    ];
  return deepSubCategory
    ? Object.keys(options).reduce(
        (link, option) => link + mapOptionToLink(options, option),
        `kategorija=${deepSubCategory.value}&`
      )
    : "";
};