build-url: the bad way

build-url.js

function buildUrl(url, options) {
    var queryString = [];
    var key;
    var builtUrl;

    if (url === null) {
      builtUrl = '';
    } else if (typeof(url) === 'object') {
      builtUrl = '';
      options = url;
    } else {
      builtUrl = url;
    }

    if (options) {
      if (options.path) {
        builtUrl += '/' + options.path;
      }

      if (options.queryParams) {
        for (key in options.queryParams) {
          if (options.queryParams.hasOwnProperty(key)) {
            queryString.push(key + '=' + options.queryParams[key]);
          }
        }
        builtUrl += '?' + queryString.join('&');
      }

      if (options.hash) {
        builtUrl += '#' + options.hash;
      }
    }

    return builtUrl;
};

Borrowed directly from here: https://github.com/steverydz/build-url/blob/master/src/build-url.js