Kata done with javascript and ruby

enriclluelles/javascript/roman_numerals.js

@@ -0,0 +1,60 @@
+assert = require("assert");
+
+Number.prototype.toRoman = (function () {
+  var nmap = {
+    M: 1000, CM: 900, D: 500, CD: 400, C: 100, XC: 90, L: 50, XL: 40, X: 10, IX: 9, V: 5, IV: 4, I: 1
+  };
+
+  var toRomanR = function toRomanR(num) {
+    for (var a in nmap) {
+      if (nmap[a] <= num) {
+        return a + toRomanR(num - nmap[a]);
+      }
+    }
+    return '';
+  }
+
+  return function toRoman() {
+    return toRomanR(this);
+  };
+}());
+
+String.prototype.toArabic = (function () {
+  var nmap = {
+    M: 1000, CM: 900, D: 500, CD: 400, C: 100, XC: 90, L: 50, XL: 40, X: 10, IX: 9, V: 5, IV: 4, I: 1
+  };
+
+  var toArabicR = function toArabicR(str) {
+    for (var a in nmap){
+      if (str.substr(0, a.length) === a) {
+        return nmap[a] + toArabicR(str.slice(a.length));
+      }
+    }
+    return 0;
+  }
+
+  return function toArabic() {
+    return toArabicR(this);
+  };
+}());
+
+
+assert.equal(Number(0).toRoman(),"");
+assert.equal(Number(1).toRoman(),"I");
+assert.equal(Number(20).toRoman(),"XX");
+assert.equal(Number(34).toRoman(),"XXXIV");
+assert.equal(Number(99).toRoman(),"XCIX");
+assert.equal(Number(999).toRoman(),"CMXCIX");
+assert.equal(Number(2000).toRoman(),"MM");
+assert.equal(Number(2999).toRoman(),"MMCMXCIX");
+assert.equal(Number(12000).toRoman(),"MMMMMMMMMMMM");
+
+assert.equal("".toArabic(),0);
+assert.equal("I".toArabic(),1);
+assert.equal("XX".toArabic(),20);
+assert.equal("XXXIV".toArabic(),34);
+assert.equal("XCIX".toArabic(),99);
+assert.equal("CMXCIX".toArabic(),999);
+assert.equal("MM".toArabic(),2000);
+assert.equal("MMCMXCIX".toArabic(),2999);
+assert.equal("MMMMMMMMMMMM".toArabic(),12000);

enriclluelles/ruby/roman_numerals.rb

@@ -0,0 +1,49 @@
+class Fixnum
+  def toRoman num = self
+    @@nmap.each do |k, v|
+      return k.to_s + toRoman(num - v) if (num >= v)
+    end
+    ''
+  end
+
+  private
+    @@nmap = { M: 1000, CM: 900, D: 500, CD: 400, C: 100, XC: 90, L: 50, XL: 40, X: 10, IX: 9, V: 5, IV: 4, I: 1 }
+end
+
+class String
+  def toArabic str = self
+    @@nmap.each do |k, v|
+      pat = %r{^#{k}}
+      return v + toArabic(str.gsub(pat,'')) if str =~ pat
+    end
+    0
+  end
+
+  private
+    @@nmap = { M: 1000, CM: 900, D: 500, CD: 400, C: 100, XC: 90, L: 50, XL: 40, X: 10, IX: 9, V: 5, IV: 4, I: 1 }
+end
+
+require 'minitest/spec'
+require 'minitest/autorun'
+
+describe Fixnum do
+  it "should convert arabics to romans" do
+      2.toRoman.must_equal 'II'
+      2000.toRoman.must_equal 'MM'
+      36.toRoman.must_equal 'XXXVI'
+      99.toRoman.must_equal 'XCIX'
+      0.toRoman.must_equal ''
+      12000.toRoman.must_equal 'M' * 12
+  end
+end
+
+describe String do
+  it "should convert romans to arabics" do
+    'II'.toArabic.must_equal 2
+    'MM'.toArabic.must_equal 2000
+    'XXXVI'.toArabic.must_equal 36
+    ''.toArabic.must_equal 0
+    'LDLD'.toArabic.must_equal nil
+    ('M' * 12 + 'IV').toArabic.must_equal 12004
+  end
+end