palindrome-recursive-algorithm-added (#450)

Author: malihassan20

Recursive/Palindrome.js

@@ -0,0 +1,30 @@
+
+// Check whether the given string is Palindrome or not
+const Palindrome = (str) => {
+ if (typeof str !== 'string') {
+ str = str.toString()
+ }
+
+ if (str === null || str === undefined) {
+ return false
+ }
+
+ if (str.length === 1 || str.length === 0) {
+ return true
+ }
+
+ if (str[0] !== str[str.length - 1]) {
+ return false
+ } else {
+ return Palindrome(str.slice(1, str.length - 1))
+ }
+};
+
+// testing
+(() => {
+ console.log('Palindrome: String: a = ', Palindrome('a'))
+ console.log('Palindrome: String: abba = ', Palindrome('abba'))
+ console.log('Palindrome: String: ababa = ', Palindrome('ababa'))
+ console.log('Not Palindrome: String: abbxa = ', Palindrome('abbxa'))
+ console.log('Not Palindrome: String: abxa = ', Palindrome('abxa'))
+})()