Palindrome Test in JavaScript

palindrome.js

// reverse word and compare
function isPalindrome1(word) {
	var s = '';
	for (var i=word.length-1; i>=0; i--) {
		s += word[i];
	}
	return s === word;
}

// compare from end to end (more efficient)
function isPalindrome2(word) {
	for (var a=0; a<word.length; a++) {
		var b = word.length-1 - a;
		if (a===b || b<a) return true;
		else if (word[a]!=word[b]) return false;
	}
}

test(isPalindrome1);
test(isPalindrome2);

function test(fn) {
    console.log('mom: ' + fn('mom'));
    console.log('racecar: ' + fn('racecar'));
    console.log('kook: ' + fn('kook'));
    console.log('family: ' + fn('family'));
}