JS: toQueryParams

gistfile1.js

function toQueryParams(string, separator) {
  string = String(string);
  var match = string.split('?'), object = {};

  // if ? (question mark) is present and there is no query after it
  if (match.length > 1 && !match[1]) return object;

  // since we split on the ?, let's merge back everything after
  // the question mark as there could be a url with a parameter
  // containing another url with query.
  match = match.slice(1).join('?');

  // bail if empty string
  if (!match) return object;

  var pair, key, value, index, i = 0,
   pairs = match.split(separator || '&'), length = pairs.length;

  // iterate over key-value pairs
  for ( ; i < length; i++) {
    value = undefined;
    index = (pair = pairs[i]).indexOf('=');
    if (!pair || index == 0) continue;

    // grab the query before the # (hash) and\or spaces
    (pair = pair.split('#')) && (pair = pair[0].split(' ')[0]);

    if (index != -1) {
      key = decodeURIComponent(pair.slice(0, index));
      value = pair.slice(index + 1);
      if (value) value = decodeURIComponent(value);
    } else key = pair;

    if (object[key]) {
      if (Object.prototype.toString.call(object[key]) !== '[object Array]') object[key] = [object[key]];
      object[key].push(value);
    }
    else object[key] = value;
  }
  return object;
}