What modernizer scripts exist for the new ECMAScript 5 functions?

Question

ECMAScript 5 has quite a few nice additions. John Resig has a good overview here. Here is a good ECMAScript 5 compatibility table.

A lot of this stuff can be \"fake

Answer 1

If you don't mind learning the library and writing some code yourself, you can find some code implementations of the ECMAScript 5 library at

https://developer.mozilla.org/En/JavaScript/ECMAScript_5_support_in_Mozilla

For example, the code for Array.filter

And then Crockford has JSON.parse/stringify in json2.js

https://github.com/douglascrockford/JSON-js