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underscore.js has so many useful helper functions while being lightweight and unobtrusive:

http://underscorejs.org/




May want to check out lodash

https://github.com/bestiejs/lodash


I discovered underscore.js recently, I really like it as well. After learning a little functional programming, it is cool to see things like map, contains, select, etc. brought into JavaScript in an easy-to-use way.




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