[tethis]

It's also included by default in Play Framework.

I used it for a while, on a large project, and eventually came to hate it. I try to write as clean code as ppossible but still found the resulting mess of words, commas and arrows floating around at differing indentation levels to be much harder to read.

To me, even though javascripts syntax can be annoying, it's parentheses provide a certain amount of structure to the code.