Data commit

Task/Roman-numerals-Encode/JavaScript/roman-numerals-encode-2.js

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+(function () {
+    'use strict';
+
+
+    // If the Roman is a string, pass any delimiters through
+
+    // (Int | String) -> String
+    function romanTranscription(a) {
+        if (typeof a === 'string') {
+            var ps = a.split(/\d+/),
+                dlm = ps.length > 1 ? ps[1] : undefined;
+
+            return (dlm ? a.split(dlm)
+                    .map(function (x) {
+                        return Number(x);
+                    }) : [a])
+                .map(roman)
+                .join(dlm);
+        } else return roman(a);
+    }
+
+    // roman :: Int -> String
+    function roman(n) {
+        return [[1000, "M"], [900, "CM"], [500, "D"], [400, "CD"], [100,
+        "C"], [90, "XC"], [50, "L"], [40, "XL"], [10, "X"], [9,
+        "IX"], [5, "V"], [4, "IV"], [1, "I"]]
+            .reduce(function (a, lstPair) {
+                var m = a.remainder,
+                    v = lstPair[0];
+
+                return (v > m ? a : {
+                    remainder: m % v,
+                    roman: a.roman + Array(
+                            Math.floor(m / v) + 1
+                        )
+                        .join(lstPair[1])
+                });
+            }, {
+                remainder: n,
+                roman: ''
+            }).roman;
+    }
+
+    // TEST
+
+    return [2016, 1990, 2008, "14.09.2015", 2000, 1666].map(
+        romanTranscription);
+
+})();