getterSetter.js

function Model(props) {
  var obj = { 'props': props };
  
  for (o in obj.props) {
    if (obj.props.hasOwnProperty(o)) {
      this[o] =  new Function("value", "if (!arguments.length) return typeof this.props['" + o.toString() +
      "'] == 'function' ? this.props['" + o.toString() + "'].call(this) : this.props['" + o.toString() + "'];" +
      "this.props['" + o.toString() + "'] = (typeof value == 'function' ? value.call(this) : value); return this")
    }
  }
  
  return obj;
}