feat(convertToRoman): Add 'convertToRoman' function (#122) (#123)

src/convertToRoman.js

@@ -0,0 +1,22 @@
+export default convertToRoman
+
+/**
+*Original Source: https://stackoverflow.com/questions/9083037/convert-a-number-into-a-roman-numeral-in-javascript
+*This method will convert a number into a roman numeral
+* @param {Number} num - number to convert
+* @return {String} - roman numeral of the number
+*/
+
+function convertToRoman(num) {
+  const arr1 = [1000, 900, 500, 400, 100, 90, 50, 40, 10, 9, 5, 4, 1]
+  const arr2 = ['M', 'CM', 'D', 'CD', 'C', 'XC', 'L', 'XL', 'X', 'IX', 'V', 'IV', 'I']
+  let roman = ''
+  for (let i = 0; i < arr1.length; i++) {
+    if (num / arr1[i] >= 1) {
+      num = num - arr1[i]
+      roman = roman + arr2[i]
+      i--
+    }
+  }
+  return roman
+}

src/index.js

@@ -41,6 +41,7 @@ import isOdd from './is-odd'
 import isNumeric from './is-numeric'
 import max from './max'
 import slugify from './slugify'
+import convertToRoman from './convertToRoman'
 
 export {
   isOdd,
@@ -86,4 +87,5 @@ export {
   isNumeric,
   max,
   slugify,
+  convertToRoman,
 }

test/convertToRoman.test.js

@@ -0,0 +1,9 @@
+import test from 'ava'
+import {convertToRoman} from '../src'
+
+test('convert to roman numeral', t => {
+  const object = 24
+  const expected = 'XXIV'
+  const actual = convertToRoman(object)
+  t.deepEqual(actual, expected)
+})