Is there a way to create a global setter?

Question

What I need is to have a function, which is called every time an assignments is performed, so for example when there is :

var a = b;
c = d;
// or even 
for(var i=3...){}

I could have a function like :

function assigned(nameL, valL, nameR, valR){
}

I don't have high hopes for that, I also acknowledge that it may speed things down a lot, but I need it only for debugging purposes.

Answer 1

Is there a way to create a global setter?

No.

ECMAScript2015 introduces Proxy objects which allows you to do "meta programming" but it doesn't work the way you want.

The Proxy object is used to define custom behavior for fundamental operations (e.g. property lookup, assignment, enumeration, function invocation, etc).

Answer 2

Object.defineProperty(window, "varname", {set : callbackfunction}}; is the way to go link