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We are working towards making exercises stand-alone. That is to say: no more generating READMEs on the fly. This will give maintainers more control over each individual exercise README, and it will also make some of the backend logic for delivering exercises simpler. The README template uses the Go text/template package, and the default templates generate the same READMEs as we have been generating on the fly. See the documentation in [regenerating exercise readmes][regenerate-docs] for details. The READMEs can be generated at any time using a new 'generate' command in configlet. This command has not yet landed in master or been released, but can be built from source in the generate-readmes branch on [configlet][]. [configlet]: https://github.com/exercism/configlet [regenerate-docs]: https://github.com/exercism/docs/blob/master/maintaining-a-track/regenerating-exercise-readmes.md
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Roman Numerals
Write a function to convert from normal numbers to Roman Numerals.
The Romans were a clever bunch. They conquered most of Europe and ruled it for hundreds of years. They invented concrete and straight roads and even bikinis. One thing they never discovered though was the number zero. This made writing and dating extensive histories of their exploits slightly more challenging, but the system of numbers they came up with is still in use today. For example the BBC uses Roman numerals to date their programmes.
The Romans wrote numbers using letters - I, V, X, L, C, D, M. (notice these letters have lots of straight lines and are hence easy to hack into stone tablets).
1 => I
10 => X
7 => VII
There is no need to be able to convert numbers larger than about 3000. (The Romans themselves didn't tend to go any higher)
Wikipedia says: Modern Roman numerals ... are written by expressing each digit separately starting with the left most digit and skipping any digit with a value of zero.
To see this in practice, consider the example of 1990.
In Roman numerals 1990 is MCMXC:
1000=M 900=CM 90=XC
2008 is written as MMVIII:
2000=MM 8=VIII
See also: http://www.novaroma.org/via_romana/numbers.html
Elm Installation
Refer to the Exercism help page for Elm installation and learning resources.
Writing the Code
The first time you start an exercise, you'll need to ensure you have the appropriate dependencies installed.
$ npm install
Execute the tests with:
$ npm test
Automatically run tests again when you save changes:
$ npm run watch
As you work your way through the test suite, be sure to remove the skip <|
calls from each test until you get them all passing!
Source
The Roman Numeral Kata http://codingdojo.org/cgi-bin/index.pl?KataRomanNumerals
Submitting Incomplete Solutions
It's possible to submit an incomplete solution so you can see how others have completed the exercise.