ES6 proxies and method interception, 2 different ways of setting your get trap

es6ProxiesAndGetTrap.js

//  http://deploytonenyures.blogspot.fr/2015/11/es6-proxies-part-ii.html
//to run it in node.js 4 it should be just this flag:  --harmony_proxies
//but does not seem to work, so run it in Firefox

var cat = {
	name: "Kitty",
	method1: function(msg){
		console.log("cat: " + this.name + ", method1 invoked with msg: " + msg);
		this.method2(msg);
	},
	
	method2: function(msg){
		console.log("cat: " + this.name + ", method2 invoked with msg: " + msg);
	}
};

console.log("------------------------------");
console.log("- No Proxy:");
cat.method1("Francois");
console.log("------------------------------");

//other method calls done from the first intercepted method are ALSO intercepted
var allCallsProxied  = new Proxy(cat, {
	get: function(target, propKey, receiver){
		//I only want to intercept method calls, not property access
		var propValue = target[propKey];
		if (typeof propValue != "function"){
			return propValue;
		}
		else{
			return function(){
				console.log("intercepting call to " + propKey + " in cat " + target.name);
				//"this" points to the proxy, is like using the "receiver" that the proxy has captured
				return propValue.apply(this, arguments);
			}
		}
	}
});

console.log("------------------------------");
console.log("- Using Proxy 1:");
allCallsProxied.method1("Francois");
console.log("------------------------------");


//other method calls done from the first intercepted method are NOT intercepted
var entryCallProxied = new Proxy(cat, {
	//target is the object being proxied, receiver is the proxy
	get: function(target, propKey, receiver){
		//I only want to intercept method calls, not property access
		var propValue = target[propKey];
		if (typeof propValue != "function"){
			return propValue;
		}
		else{
			return function(){
				console.log("intercepting call to " + propKey + " in cat " + target.name);
				//target is the object being proxied
				return propValue.apply(target, arguments);
			}
		}
	}
});

console.log("------------------------------");
console.log("- Using Proxy 2:");
entryCallProxied.method1("Francois");
console.log("------------------------------");


// ------------------------------
// - Using allCallsProxied:
// intercepting call to method1 in cat Kitty
// cat: Kitty, method1 invoked with msg: Francois
// intercepting call to method2 in cat Kitty
// cat: Kitty, method2 invoked with msg: Francois
// 2
// ------------------------------
// - Using entryCallProxied:
// intercepting call to method1 in cat Kitty
// cat: Kitty, method1 invoked with msg: Francois
// cat: Kitty, method2 invoked with msg: Francois
// ------------------------------