parseQueryString.js

function parseQueryString(queryString) {
  Array.prototype.fapply = function(fn) { return fn(this); };
  return (queryString[0] === '?' ? queryString.substr(1) : '')
    .split('&')
    .fapply(i => (i.length && !i[0]) ? [] : i)
    .map(i => i.length ? i.split('=') : [])
    .reduce((a, i) => {
      a[i[0]] = i[1];
      return a;
    }, {});
}