JavaScript Check Palindrome

palindrone.js

function checkPalindrome(str) {

	if(str) {
		var pattern = /[^a-zA-z]+/g; // first remove spaces and special chars from given string
		str = str.replace(pattern, '').toLowerCase();
		var str1 = str.split('').reverse().join('');
		console.log(str, str1); // for testing
		if(str1 == str.toLowerCase()) {
			return true;
		}else {
			return false;
		}
	}
}

Output >
checkPalindrone("diD")  => true


// Second method without using any predefined method :

function checkPalin(str)  {
	
	var pattern = /[^a-zA-z]+/g;
	var output = "";
	var input = str.replace(pattern, '').toLowerCase();
	for(var item of input) {
 		output = item  + output; 
	}
	if(input == output) {
		return true;
	}else {
		return false;
	}
}

Ouput > 
	checkPalin("Cigar? Toss it in a can. It is so tragic")
	result is true

example  : https://codepen.io/mfenton/pen/OjyGEN