The goal of the CoffeeScript koans is to teach you CoffeeScript programming through actually doing it, in a test-first fashion.
When you first run the Koans, you'll be presented with a run-time error and a stack trace indicating where the error occurred. Your goal is to make the error go away. As you fix each error, you should learn something about the CoffeeScript language and functional programming in general.
Your journey towards CoffeeScript enlightenment starts in the Koans folder with the AboutExpects.coffee file.
These Koans will be very simple, so don't over-think them! As you progress through more Koans, more and more CoffeeScript syntax will be introduced which will allow you to solve more complicated problems and use more advanced techniques.
This project requires Node.js - if you haven't already installed it I would recommend installing the Node Version Manager - NVM - and using that to install Node.
Install dependencies by using npm from the command line:
npm install
Start with copying the file koans/AboutShould.coffee to the completed-koans/ folder.
Run the tests with Mocha on the command line:
npm test
You should see the following output:
About Should
1) should expect true
- should have filled in values
- should understand type coercion is fixed
- should expect equality
- should assert equality a better way
0 passing (7ms) <- this is how long the tests took to run
4 pending
1 failing
You'll see that one of the tests is failing, and that the other 4 have been temporarily disabled (marked as 'pending').
Edit the AboutShould.coffee file (your copy in the completed-koans/ folder) with the editor or IDE of your choice and follow the directions to fix the problem in the first test.
When you think you've fixed the problem, run the tests again.
npm test
When that test passes, enable the next pending test. Rinse and repeat until all tests turn green, simples :-)
When you're done with AboutShould.coffee, copy another file from the koans/ folder to the completed-koans/ folder and start work on that.
I'd suggest trying them in the following order, but it's not prescriptive:
- AboutShould.coffee
- AboutFunctions.coffee
- AboutArrays.coffee
- AboutMutability.coffee
- AboutObjects.coffee
- AboutInheritance.coffee
- AboutHigherOrderFunctions.coffee
- AboutApplyingWhatWeHaveLearnt.coffee
If you want to just test a single test file, you can do it like this: (remember to add in the name of your file)
mocha --compilers coffee:coffee-script/register -R spec completed-koans/FILE-NAME-GOES-HERE.coffee
If you want mocha to watch your files for changes and rerun the tests automagically when you save changes to a test file, simply use:
npm run watch
Have fun, and I hope you enjoy playing with CoffeeScript!
To say 'thanks' please endorse this project on Coderwall by clicking the button below:
Or, if you happen to be in London, please drop by for a chat and buy me a beer!
- David Laing & Greg Malcolm - for their JavaScript/Jasmine port of the Ruby koans
- Edgecase - for the great Ruby Koans
- Jeremy Ashkenas and the CoffeeScript crew on GitHub - for making CoffeeScript in the first place
- Douglas Crockford - for JavaScript; the good bits
- Daniel P. Friedman & Matthias Felleisen - for 'The Little LISPer' book, where it all started
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