J's awesome

So here are a couple of nice reads that, although they're not new, they somehow teached me something new today about J.


First one is this 9 minute video on the "i." integers monadic verb.  It's super simple. So simple I almost dismissed it as trivial. "Monadic verb that returns an array from 0 to the parameter you pass it", right? Well... There's more than meets they eye.  The trick is that for non-array programmers it's not obvious that the parameter can have many dimensions. And what zeroes mean? and negative numbers?

Next is this super nice interactive J demo.

And a classical: Loopless programming.