Good cross browser javascript compatibility/enhancement library? [closed]

Question

Apparently I have lost all my google skills. I can not find any good results for javascript libraries that attempt to cross-browser standardize javascript and provide small enhancements.

I AM NOT looking for a full framework like jQuery, Prototype, etc... even though they do this type of thing on some level. I'm talking about language/available function standardization only, no DOM stuff. Just a good cross browser library that ensures availability of all the standard stuff (array map, reduce, etc..), support for stuff like Date.toISOString() in IE 6/7/8, etc... I already know about ie7.js, ie8.js and ie9.js, but they don't exactly fit the bill.

So what else is out there?

UPDATE Just to be clear, here is the type of thing said library would do (all crossbrowser, with native fallbacks obviously):

• Date.toISOstring support
• Array.map, Array.each, Array.filter, Array.reduce support
• Shallow/Deep object cloning
• etc...

Answer 1

I find UnderscoreJS very useful for looping/sorting/querying, array manipulation, map/reduce etc:

It doesn't have date time related functions. For datetime parsing, there is dateJS