nodeFactory2.js

function nodeFactory() {
  function toStringFactory(data) { return function toString() {
    // TODO: Implement
  }}
  function compileFactory(data) { return function compile() {
    // TODO: Implement
  }}
  return {
    BaseNode: function (data) {
      return {
        toString: toStringFactory(data),
        compile: compileFactory(data)
      }
    },
    ForNode: function (data) {
      return {
        toString: function () {
          // Override toString
        }
        compile: compileFactory(data)
      }
    }
  }
}