JavaScript alternatives underscore.js

What are some non prototype modifying 开发者_如何学运维libraries that provide core functionality to JavaScript (not DOM, but Array,String,Number,RegExp,etc... manipulations)?

I'm looking for alternatives to underscore.js (jQuery doesn't count).

lodash have very good functionaliy like underscore js and it is fast also compare to underscore js.

though lodash is good but i found another good library SugarJS

Here are a few:

• async: provides some asynchronous functions for arrays like map and sortBy.
• XRegExp
• Date.js

Oliver Steele's Functional (see here or here) covers a lot of the same problem space as Underscore.

As an alternative to underscore.js, Valentine might be worth looking at.