Parses out the segments of the URI and returns either an array of all or the specified segment.

uriSegments.js

/**
 * @param {Number} segment
 */
function uriSegments(segment){
  var uri_segments = window.location.pathname.split('/');
  if(segment)
    return uri_segments[segment];
  else
    return uri_segments;
};

// Specify the segment to return one element of the URI
//                         1         2       3
// http://example.com/controller/function/argument
uriSegments(2); // returns 'function'. 0 returns an empty string

// Leave empty to return segment array
uriSegments(); // returns ['', 'controller', 'function', 'argument']

Useful if you are working with dynamic routes.