Class definition in JavaScript

define-class.js

function defineClass(props) {
  var parent = props.parent;
  var ctor = props.init || (parent ? function() { parent.apply(this, arguments); }
                                   : function() {});
  if (parent)
    ctor.prototype = Object.create(parent.prototype);
  for (var key in props)
    ctor.prototype[key] = props[key];
  return ctor;
}

var Foo = (function() {
  var Parent = Bar;
  var Foo = defineClass({
    parent: Super,
    init: function(name) {
      var self = this;
      //Super.call(self, name);  // 明示的に親クラスのコンストラクタを呼び出す必要がある
      console.log('Foo#init');
    },
    hello: function() {
      var self = this;
      console.log('Foo#hello, ' + self.name);
      //Super.prototype.hello.call(self);  // super呼び出し、ダルい…
    },
  });
  return Foo;
})();