non-writable factory functions

non-writable-factory-functions.js

// class+constructor
var Lib = function() {
  // instance variable
  this.aVariable = 0;
  // instance method
  this.changeVariable = function(value) {
    this.aVariable = value;
    return this;
  };
}
// factory
Lib.factory = Object.create(null, {
  fork: { 
    value: function(value) {
      return new Lib().changeVariable(value);
    }
  }
  /* more factory functions */
});

with(Lib.factory) {
  console.log(fork);
  var fork = "";
  console.log(fork(150).aVariable);
};