IE6 is dead, maybe we can move on

Now that IE6, 7 & 8 have been sent to the heavenly software repository₍₁₎ it’s maybe time to stop relying on jQuery quite so much and have a look at some of the ‘new’ things which javascript ES5 can do natively. We’ve been clinging on to things like $.each and $.isArray when javascript and most browsers can do it natively using Array.forEach and Array.isArray.
If you really, really, really have to support these old browsers then maybe you can just use the polyfills in the mozilla reference, at least then you can definitely move on and use Javascript as it should be.
As the ES5 reference shows there is widespread support for most of the features, unfortunately the same cannot be said for ES6 yet.

(1) Rumours of their complete death may be exaggerated but the downward trend gives us hope for the future.