Recently I’ve been busy working on FKit: a functional programming toolkit for JavaScript. It provides many functions for solving common problems with functions, objects, arrays, and strings.
I wrote FKit because I believe that JavaScript is lacking the kind of standard library that many other languages benefit from. A good example is the prelude library in Haskell: it provides developers with an amazing toolbox to write their Haskell applications with. Why should JavaScript developers have to bother solving these common problems over and over again?