Reflect.get.and.Proxy.js

//http://blog.keithcirkel.co.uk/metaprogramming-in-es6-part-2-reflect/
//http://stackoverflow.com/a/25585988

function runTest(account){
	console.log("___________");
	console.log(account.totalSpent);
	console.log("-----------");
	console.log(account.amountAvailable);
	console.log("-----------");
	console.log("toString: " + account.toString());
	console.log("___________");
}

let account = {
	initialAmount: 300,
	spentInBooks: 0,
	spentInOtherStuff: 0,
	toString(){
		return `${this.initialAmount} | ${this.spentInBooks} , ${this.spentInOtherStuff}`; 
	}
};

Object.defineProperty(account, "totalSpent", {
  get: function () {
      return this.spentInBooks + this.spentInOtherStuff;
  }
});
Object.defineProperty(account, "amountAvailable", {
  get: function () {
      return this.initialAmount - this.totalSpent;
  }
});


account.spentInBooks = 10;
account.spentInBooks = 15;


//Do not go through the proxy for internal calls (neither for methods nor descriptor accessors)
var proxiedAccount1 = new Proxy(account, {
	//target is the object being proxied
	get: function(target, propKey, receiver){
			console.log("intercepting call to " + propKey ); 
			var propValue = target[propKey];
			if (typeof propValue != "function"){
				return Reflect.get(target, propKey); // === Reflect.get(target, propKey, target)
			}
			else{
				return function(){
					return propValue.apply(target, arguments);
				}
		}
			
		}	
	}
);

runTest(proxiedAccount1);
console.log("");

//Go through the proxy for internal method calls and internal accessor descriptors
var proxiedAccount2 = new Proxy(account, {
	//target is the object being proxied
	get: function(target, propKey, receiver){
			console.log("intercepting call to " + propKey ); 
			return Reflect.get(target, propKey, receiver);
		}
	}
);
runTest(proxiedAccount2);
console.log("");

//internal method calls will also go through the proxy, but not the accessor descriptors
var proxiedAccount3 = new Proxy(account, {
	//target is the object being proxied
	get: function(target, propKey, receiver){
			console.log("intercepting call to " + propKey ); 
			return Reflect.get(target, propKey); // === Reflect.get(target, propKey, target)
		}	
	}
);

runTest(proxiedAccount3);
console.log("");