Vending machine code kata, in Clojure. NOT an example of how to do it!

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simon 694230405c Altered coin values to actual (relative) values of old Scots coins; this makes it all mind-bendingly harder, and is probably not a good exercise!		2015-04-30 08:18:52 +01:00
doc	Added the source file, which is what actually matters	2014-03-22 16:17:50 +00:00
resources/public	Added coin images.	2014-03-26 22:34:37 +00:00
src/vending	Altered coin values to actual (relative) values of old Scots coins; this	2015-04-30 08:18:52 +01:00
test/vending/test	Altered coin values to actual (relative) values of old Scots coins; this	2015-04-30 08:18:52 +01:00
LICENSE	Added the source file, which is what actually matters	2014-03-22 16:17:50 +00:00
project.clj	Added a basic Luminus webapp template; not really fleshed that out yet.	2014-03-26 21:55:30 +00:00
README.md	Markdown tidyup.	2014-03-27 23:47:51 +00:00

README.md

vending

A Clojure implementation of the Vending Machine kata, see http://code.joejag.com/coding-dojo-vending-machine/

NOTE! I am LEARNING. This is not an example of how to do it.

Usage

The state of the machine is represented by a structure which is passed around between functions.

So you can make a machine with make-default-machine:

vending.repl=> (make-default-machine)
{:tendered nil, :output nil, :coins {:plack 4, :merk 1, :bawbee 4, :bodle 4}, :change nil, :stock {:teacake 5, :caramel-wafer 5, :snowball 5}, :message ""}

You can add coins to it with add-coin; as this is a Scots machine the coins you can add are merks, placks, bawbees and bodles.

vending.repl=> (add-coin (add-coin *1 :merk) :bawbee)
{:message "Added a :bawbee", :tendered (:bawbee :merk), :output nil, :coins {:plack 4, :merk 1, :bawbee 4, :bodle 4}, :change nil, :stock {:teacake 5, :caramel-wafer 5, :snowball 5}}

The machine serves good Scottish super-foods: caramel wafers, teacakes and snowballs. To get a teacake, try

vending.repl=> (get-teacake *1)
{:message "Enjoy your :teacake", :coins {:merk 2, :plack 4, :bawbee 4, :bodle 4}, :change (:bawbee), :output (:teacake), :stock {:teacake 4, :caramel-wafer 5, :snowball 5}}

There's very little error checking; if you try to add a dollar, I've no idea what will happen but it probably won't be good.

Finally if you add coins and decide you want them back, you can use coin-return:

vending.repl=> (coin-return (add-coin (add-coin (make-default-machine) :merk) :plack))
{:message "Coins returned", :output nil, :coins {:plack 4, :merk 1, :bawbee 4, :bodle 4}, :change (:plack :merk), :stock {:teacake 5, :caramel-wafer 5, :snowball 5}}

Possible future development

My panned next phase for this is to make it drive an interactive web page, first entirely server-side, and then, if that works, client-side.

License

Distributed under the Eclipse Public License either version 1.0 or (at your option) any later version, simply because that's the default the package template gave us.