Techniques for sharing a variable between two public functions without exposing the variable.

shared variable.js

// Technique 1 - local captures
var _xy = (function(){
  var shared = {};
  var foo = function(){ ...access shared... };
  var bar = function(){ ...access shared... };
  return [foo,bar];
})();
var foo = _xy[0];
var bar = _xy[1];

// Technique 2 - spam a particular object space
var scope = this; // e.g. global/window
(function(){
  var shared = {};
  scope.foo = function(){ ...access shared... };
  scope.bar = function(){ ...access shared... };
})();