Thanks to everyone who has commented or contributed, praised or pitched in — I’ve released an update to Functional Javascript, with these changes:

New features

  • Rhino compatibility. I think — at least it loads now, and a couple of hand tests work; i have yet to port the testing tool. (Credit: Reginald Braithwaite)


  • More efficient Array.slice. (Credit: Dean Edwards)
  • Memoize Function.lambda. (Credit: henrah)

Packaging changes

  • Added jsmin version. With jsmin and gzip, the file is 2.5K.
  • Moved string lambdas to a separate file, to-string.js. (Both files are included in the jsmin version.)
  • Reformatted for new version of the doc tool.

Compatibility notes

If you were including functional.js before, now you need to include both functional.js and to-function.js in order to get the string lambda conversion functions too. Or you can include functional.min.js, which is smaller and includes them both.

The fact that functional.js itself no longer contains any regular expressions might make it usable in Flash. I haven’t actually tried this, because the only Flash I use is OpenLaszlo, which is still at version 8 of the Flash file format (AVM2, no JIT, <25% browser speed method calls are 10% of Firefox 2 / Safari 3.0 speed). I don’t dare program at too high a level in Flash 8 because of performance concerns.

Meanwhile, over in Ruby land…

I’ll also put in a plug here for Braithwaite’s String#to_proc, which is a port of string lambdas to Ruby:

(1..5).map &'*2'
  -> [2, 4, 6, 8, 10]
(1..5).inject &'+'
  -> 15
factorial = "(1.._).inject &'*'".to_proc
  -> 120

I’ve been a Raganwald fan for a while; and Ruby is my favorite server-side glue language, I look forward to using it there…