Memoized function for getting request parameters from the URL

getRequestParam.js

var getRequestParam = (function(window) {
  var params = [], keys = [], values = [];
  return function(param) {
    var index = -1, pair;
    if (params.length === 0) {
      params = window.location.href.split("?");
      if (params.length === 1) return false;
      params = params[1].split("&");
      params.forEach(function(p) {
        pair = p.split("=");
        keys.push(pair[0]);
        values.push(pair[1]);
      });
    }
    if (params.length === 0) return false;
    index = keys.indexOf(param);
    return (index !== -1) ? values[index] : false;
  };
}(window));