Solution Review: Proxy

'use strict';
                                           
const createPlayMethodProxy = function(instance) {
  const handler = {
    get: function(target, propertyName, receiver) {
      if(propertyName.startsWith('play')) {
        const activity = propertyName.substring(4);
        if(target.activities.includes(activity)) {
          return () => `I love to play ${activity}`;
        } else {
          return () => `I don't play ${activity}`;
        }
      } else {
        throw new Error(`${propertyName} is not a function`);
      }
    }
  };
  
  return new Proxy(instance, handler);
};
                                                                          
const proxy = createPlayMethodProxy({ activities: ['Football', 'Tennis'] });
console.log(proxy.playTennis());   //I love to play Tennis
console.log(proxy.playFootball()); //I love to play Football
console.log(proxy.playPolitics()); //I don't play Politics
try {
  console.log(proxy.dance());
} catch(ex) {
  console.log(ex.message); //dance is not a function
}