SuperHash PoC

superhash.js

function set(target, name, value) {
	const attrConfig = target.constructor?.attributes[name];
	if (typeof attrConfig?.init === 'function') {
		target[name] = attrConfig.init.call(this, value);
	}
	if (attrConfig?.defaultValue) {
		target[name] = attrConfig.defaultValue;
	} else if (typeof attrConfig?.transform === 'function') {
		target[name] = attrConfig.transform.call(target, value);
	} else {
		target[name] = value;
	}
	return true;
}
class SuperHash {
	
	static attributes = {};

  static initialize(proxy, props) {
    Object.keys(props).forEach((prop) => {
     proxy[prop] = props[prop];
    });
  }
  constructor(props) {
		const proxy = new Proxy(this, { set, get(target, name) { return target[name] } });
    SuperHash.initialize(proxy, props);
		return proxy;
  }
}

class FirstName extends SuperHash {
  static attributes = {
    value: {
      transform: (value) => value.toUpperCase()
    }
  }
}

class LastName extends SuperHash {
  static attributes = {
    value: {
      transform: (value) => value.toLowerCase()
    }
  }
}
class Name extends SuperHash {
  static attributes = {
    firstName: {
      transform: (val) => new FirstName(val)
    },
    lastName: {
      transform: (val) => new LastName(val)
    }
  }
}