function to return url parameters as a string

parameter-url.js

_computeSearchUrlParameters(freeTextSearch, originFilter, destinationFilter, quotationStatusFilter) {
    const argNames = ['freeTextSearch', 'originFilter', 'destinationFilter', 'quotationStatusFilter'];

    let result = '?';

    [].forEach.call(arguments, (arg, index) => {
      if (arg && arg.length) {
        result += argNames[index] + '=' + arg + '&';
      }
    });

    // if some parameter exists then remove last '?' else return null
    result = (result.length > 1) ? result.slice(0, -1) : null;

    return result;
  }