gistfile1.js

// In this example, the private_thing is more like a private class variable than a private instance variable.

thingie_proto = function(){
  thingie_proto = {};
  
  var private_thing = '';
  thingie_proto['private_thing'] = function(){ return private_thing; }; // get…
  thingie_proto['set_private_thing'] = function(o){ private_thing = o; }; // set…
  
  thingie_proto['public_thing'] = '';
  
  return thingie_proto;
}();

var F=function(){};
F.prototype = thingie_proto;

thingie_one = new F();
thingie_two = new F();

thingie_one['public_thing'] = 'dog';
thingie_two['public_thing'] = 'cat';

thingie_one.set_private_thing('house');
thingie_two.set_private_thing('car');

puts(thingie_one['public_thing']);
puts(thingie_two['public_thing']);
puts(thingie_one.private_thing());
puts(thingie_two.private_thing());