Oct 20, 2018
diff --git a/Strings/checkPalindrome.js b/Strings/checkPalindrome.js
 // JavaScript implementation of palindrome check
 // More details: https://medium.freecodecamp.org/two-ways-to-check-for-palindromes-in-javascript-64fea8191fd7
 /**
 * @description Check if the input is a palindrome
 *
 * @param {string|number} input
 * @returns {boolean} is input a palindrome?
 */
 function checkPalindrome(input) {
    // Only strings and numbers can be palindrome
    if (typeof input !== 'string' && typeof input !== 'number') {
        return null;
    }

    // Convert given number to string
    if (typeof input === 'number') {
        input = String(input);
    }

    return input === input.split('').reverse().join('');
 }

 // Test
 let input = 'ABCDCBA';
 console.log(checkPalindrome(input)); // true

 input = 12321;
 console.log(checkPalindrome(input)); // true

 input = 123.321;
 console.log(checkPalindrome(input)); // true

 input = 'ABCD';
 console.log(checkPalindrome(input)); // false

 input = 123.4;
 console.log(checkPalindrome(input)); // false

 input = {};
 console.log(checkPalindrome(input)) // null
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1,40 @@
		// JavaScript implementation of palindrome check
		// More details: https://medium.freecodecamp.org/two-ways-to-check-for-palindromes-in-javascript-64fea8191fd7
		/**
		* @description Check if the input is a palindrome
		*
		* @param {string\|number} input
		* @returns {boolean} is input a palindrome?
		*/
		function checkPalindrome(input) {
		// Only strings and numbers can be palindrome
		if (typeof input !== 'string' && typeof input !== 'number') {
		return null;
		}

		// Convert given number to string
		if (typeof input === 'number') {
		input = String(input);
		}

		return input === input.split('').reverse().join('');
		}

		// Test
		let input = 'ABCDCBA';
		console.log(checkPalindrome(input)); // true

		input = 12321;
		console.log(checkPalindrome(input)); // true

		input = 123.321;
		console.log(checkPalindrome(input)); // true

		input = 'ABCD';
		console.log(checkPalindrome(input)); // false

		input = 123.4;
		console.log(checkPalindrome(input)); // false

		input = {};
		console.log(checkPalindrome(input)) // null