Determine if a given string is a paindrome

palindrome.js

function isPalindrome(str) {
	var middle = Math.floor(str.length / 2),
		m = 0,
		strArr = str.toLowerCase().split("");
	for (m; m <= middle; m++) {
		if (strArr[m] !== strArr[strArr.length - 1 - m]) {
			return false;
		}
	}
	return true;
}

console.log(isPalindrome("racecar"),
isPalindrome("broomstick"),
isPalindrome("racecars"));