What does anObject.prototype.constructor do?

Question

Suppose we have this constructor:

var Foo = function(){
   this.x = \"y\";
}

Foo and Foo.prototype.constructor ev

Answer 1

.prototype.constructor is just a helper property so that the objects created can easily refer the constructor with this.constructor, or as in your case i.constructor.

Setting it arbitrarily to something else doesn't have any effect except on code that expects to get the constructor of an object with obj.constructor:

if( obj.constructor === Foo ) {
 //It's a Foo
}

So it's a good convention just to leave it be.

The es5shim relies on .constructor.prototype to shim Object.getPrototypeOf