Roman numerals TDD kata. Implemented using the node project scaffolding template for GruntJS, which includes test setup with nodeunit.
The following instructions are taken from http://www.cyber-dojo.com/.
Given a positive integer number (eg 42) determine its Roman numeral representation as a String (eg "XLII").
You cannot write numerals like IM for 999.
Wikipedia states "Modern Roman numerals are written by expressing each digit separately starting with the leftmost digit and skipping any digit with a value of zero."
Examples:
1 -> "I" | 10 -> "X" | 100 -> "C" | 1000 -> "M"
2 -> "II" | 20 -> "XX" | 200 -> "CC" | 2000 -> "MM"
3 -> "III" | 30 -> "XXX" | 300 -> "CCC" | 3000 -> "MMM"
4 -> "IV" | 40 -> "XL" | 400 -> "CD" | 4000 -> "MMMM"
5 -> "V" | 50 -> "L" | 500 -> "D" |
6 -> "VI" | 60 -> "LX" | 600 -> "DC" |
7 -> "VII" | 70 -> "LXX" | 700 -> "DCC" |
8 -> "VIII" | 80 -> "LXXX" | 800 -> "DCCC" |
9 -> "IX" | 90 -> "XC" | 900 -> "CM" |
1990 -> "MCMXC" (1000 -> "M" + 900 -> "CM" + 90 -> "XC")
2008 -> "MMVIII" (2000 -> "MM" + 8 -> "VIII")
99 -> "XCIX" (90 -> "XC" + 9 -> "IX")
47 -> "XLVII" (40 -> "XL" + 7 -> "VII")