f_ is a library for wielding and welding iterator functions. It is designed to complement underscore.js' functions that employ iterator functions, like `map`, `filter`, `sortBy`, etc.<p>I've been using this on personal projects but just spent the weekend tidying it up and writing tests and documentation.<p>Documentation and sample code can be found here: <a href="http://krisjordan.github.com/f_underscore/" rel="nofollow">http://krisjordan.github.com/f_underscore/</a>