Clojure HaXmasthon

[Markku]

Hey everybody!

Finally, time for some Clojure hacking. I'll be at the office sometime between Xmas and New Year, so feel free to join the fun. Vote for the date!

http://www.doodle.com/inc9x5d7ktdwvucz

-Markku

P.S. Maybe this is a bit early to decide on a date, so I'll remind you a bit closer to the date. So take this as FYI :)

[Vesa Marttila]

Very nice! Definitely have to find time for this.

Vesa

[Markku]

Clojure HaXmasthon! I narrowed down the dates. Come and sign up so we know to order some food and which day is better.
http://www.doodle.com/inc9x5d7ktdwvucz

[Esko Luontola]

So will it start at 12 in the office? Shall we meet already earlier and go eat lunch together?

[Markku]

Yeah the start is at 12. I will be back at the office by that time. I know some people are joining only after work.

I thought that it's always a little difficult to find lunch space for a big group. But I might join, if you have good ideas. Maybe at 11?

-Markku

[Esko Luontola]

How about so that those who want to join for a lunch would come to the office at 11? I'm sure we'll figure out a place where we will fit, or then we'll split into smaller groups.

[Markku]

Alright, we'll go for aimless wandering. Let's leave at 11, shouldn't be too busy yet. Famous last words and all :-)

[Vesa Marttila]

Hi! I will try to attend lunch as well, so see you at 11.

Vesa

[Stephen Sykes]

I should arrive before 11. Do you have a contact number in case I am a
little late?

[Markku Rontu]

+358 50 382 2310

-Markku

[Stephen Sykes]

Thanks. Looks like we will be there 15 mins after 11. I will call you to see where you are.

[Esko Luontola]

I wrote a GUI for the Conway's Game of Life which I implemented that day. Any suggestions on how to make the code more idiomatic Clojure?

https://github.com/orfjackal/misc-tools/tree/master/src/main/clojure/net/orfjackal/game_of_life 

https://github.com/orfjackal/misc-tools/tree/master/src/test/clojure/net/orfjackal/game_of_life 

[Vesa Marttila]

Hi! I think it looks quite good. Below a few things I would consider altering:

https://github.com/orfjackal/misc-tools/blob/master/src/main/clojure/net/orfjackal/game_of_life/gui.clj#L36
Unless you need the result of the 'map' you should probably use 'doseq'.

https://github.com/orfjackal/misc-tools/blob/master/src/main/clojure/net/orfjackal/game_of_life/gui.clj#L66
Perhaps decouple the repainting from mutating with 'add-watch'? 'add-watch'
enables you to add a listener function to a Clojure "mutable" type.

https://github.com/orfjackal/misc-tools/blob/master/src/main/clojure/net/orfjackal/game_of_life/cell.clj
'neighbours' seems a bit repetitive. As an alternative I would suggest something
like this:
  (defn neighbors [[x y]]
    (let [diffs [-1 0 1]]
      (set (for [x2 diffs y2 diffs :when (not (and (= x x2) (= y y2)))]
               (new-cell (+ x x2) (+ y y2))))))

Also (defn x [cell] (first cell)) could be changed to (def x first), but I guess you
wanted to document the function. Also a destucturing form could be used like
this this (defn x [[fst _]] fst).

Vesa