Update and rename intToRoman.md to toRomanNumeral.md

snippets/intToRoman.md

@@ -1,31 +0,0 @@
----
-title: intToRoman
-tags: integer,roman
----
-
-### Convert Integer to Roman Number
-
-Following snippet is useful for converting integer number into roman number.
-
-***Note:-*** This code is only useful for number between 1 and 3999.
-according to Wikipedia the largest number you can represent in Roman is 3999. [click here](https://en.wikipedia.org/wiki/Roman_numerals)
-
-```js
-function intToRoman(num) {
-  const lookup = {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};
-  let roman = '';
-  for (let i in lookup ) {
-    while ( num >= lookup[i] ) {
-      roman += i;
-      num -= lookup[i];
-    }
-  }
-  return roman;
-}
-```
-
-```js
-intToRoman(11); // XI
-intToRoman(03); // III
-intToRoman(1998) // MCMXCVIII
-```

snippets/toRomanNumeral.md

@@ -0,0 +1,42 @@
+---
+title: toRomanNumeral
+tags: math,string,intermediate
+---
+
+Converts an integer to its roman numeral representation.
+Accepts value between `1` and `3999` (both inclusive).
+
+- Create a lookup table containing 2-value arrays in the form of (roman value, integer).
+- Use `Array.prototype.reduce()` to loop over the values in `lookup` and repeatedly divide `num` by the value, using `String.prototype.repeat()` to add the roman numeral representation to the accumulator.
+
+```js
+const toRomanNumeral = num => {
+  const lookup = [
+    ['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],
+  ];
+  return lookup.reduce((acc, [k, v]) => {
+    acc += k.repeat(Math.floor(num / v));
+    num = num % v;
+    return acc;
+  }, '');
+};
+
+```
+
+```js
+toRomanNumeral(3); // 'III'
+toRomanNumeral(11); // 'XI'
+toRomanNumeral(1998); // 'MCMXCVIII'
+```