Deep proxy setter for the universe

deep.js

require('harmony-reflect');

var universe = Proxy({}, {
  set: function(obj, keypath, val) {
    var keys = keypath.split('.');
    while(keys.length !== 1) {
      obj = obj[keys[0]] = obj[keys[0]] || {};
      keys.shift();
    } 
    obj[keys[0]] = val;
  }
});

universe['milky.solar'] = ['earth', 'mars'];
console.log(universe.milky.solar);