CoffeeScript is a great little language that compiles down to readable, clean JavaScript. When we were recently in Costa Rica I gave a lightning talk on some of CoffeeScript's cooler features. It's great on the surface, since this:

$("#foo").click(function () {
bar( "some text #{ something / 2 } a unit" );
});

is more cleanly written as this:

$("#foo").click ->
bar("some text " + something / 2 + "a unit" )

But as I've been writing more JavaScript, there are a handful of other neat things I find myself using a lot. Here are a few: Read more