Transforming query string params into object

queryStringToObject.js

function getParamsObj(url) {
  return url
  .split('?')[1]
  .split('&')
  .map(function(el) {
    return el.split('=');
  })
  .reduce(function(prevVal, currVal) {
    prevVal[currVal[0]] = currVal[1]
      .split(',')
      .filter(function(el){
        return el.length>0;
      });
      return prevVal;
  },{} );
}