snelly | based SDF | Graphics library

I'm learning Erlang and have come across/trying to understand list comprehension. I've discovered that you can make Cartesian products quite easily using it.

Basically I though of a deck of cards and that if you multiply the unique values by the number of suits, you will result will every possible combination - creating a full deck of cards. However, what if I wish to add the 2 jokers to the deck - but jokers do not belong to a suit. How do we solve that issue?

The code below is what I have so far and will output the possible combinations without the jokers.

I'm currently working on an invoice project.

So far I have a dynamic form where you can add and remove rows (see snippet below).

However I have a problem with my javascript, I was wondering if someone could help me out with it.

Basically, when you input the values into the form on the first row, it calculates it all perfectly. However, if you add a new row and try to fill it in with some data, the javascript doesn't seem to perform any calculation for that row. It only works for the first row and it's really frustrating me! I can't seem to figure out why.

Any help is much appreciated. The snippet of code is below and you can run it and add some data to some rows to see for yourself. I need any advice I can get on this.

Thanks in advance guys.

Snelly