How to use ObjCClass library

ObjCClass.api.js

const MyClass = new ObjCClass({
  classname: 'MyClass',
  superclass: NSButton,

  _private: 'initial',

  init() {
    log("my custom init code. no need to call super here ");
    this._private = 'test';
  },

  test() {
    log("test: " + this._private);
  },

  description() {
   const ret = `<MyClass _private=${this._private}>`;
    return NSString.stringWithString(ret);
  }
})

const obj = MyClass.new();
log(`obj ${obj}`);

obj.test();

// But this is more elegant!
obj._private = "efgh";
obj.test();

If you do want to call super and use the result:

description() {
  // Cache appropriate function, don't look it up each time
  if (typeof MyClass._superDesc == 'undefined') {
    MyClass._superDesc = SuperCall(NSStringFromSelector('description'), [], {type:"@"});
  }
  const superDesc = MyClass._superDesc.call(this);
  return NSString.stringWithString(`${superDesc} { _private=${this._private} }`);
}