Add refactor

Author: programmiri

word-count/word-count.js

@@ -3,7 +3,7 @@ export class Words {
   	const words = string.toLowerCase().trim().split(/[\s]+/g)
 
   	return words.reduce((acc, curr) => {
-  		if (acc[curr] && typeof acc[curr] === 'number' ) {
+  		if (acc[curr] && !isNaN(acc[curr])) {
   			acc[curr] = acc[curr] + 1
   		} else {
 				acc[curr] = 1