Another challenge from another developer. This will verify if the string passed is a palindrome. Check out http://en.wikipedia.org/wiki/Palindrome for more details on what a palindrome is. The best test for this is Demetri Martin's Palindrome poem (which is one of the console.logs). It will strip all non-word characters, numbers and underscores …

palindrome.js

function isPalindrome(str){

    var iteration, i = 0;

	// if str is only one character long, no matter the character, return false
	if(str.length < 2) return false;
	
	// set all characters to lowercase and strip any invalid characters
	str = str.toLowerCase().replace(/[\W\d_]/g, "");
	
	// if string length is odd strip out middle character
	if(str.length % 2 !== 0){
		
		// convert string to array of characters	
		str = str.split("");
		
		// remove the middle character from the array
		str.splice((str.length-1)/2,1);
		
		// convert array back to string
		str = str.join("");
		
	} 
	
	// cut length in half to determine how many times to iterate over string
	iteration = str.length/2;
	
	// iterate over string comparing the bookended characters from the outside in 
	for(i; i < iteration; i++){
		
		// if characters don't match at any point return false
		if(str[i] !== str[(str.length-1)-i]){
			return false;
		}
		
	}
	
	// at this point all characters have matched so return true
	return true;
	
}

//console.log(isPalindrome("no 'x' 120044()[]\"{}<>\/$~^|-+%*=!?#&@_:;.,''innixon"))
//console.log(isPalindrome("no \"x\" in nix on"));
//console.log(isPalindrome("anna"));
//console.log(isPalindrome("annabannana"));
//console.log(isPalindrome("noxinnixon"));
//console.log(isPalindrome("rececer"));
//console.log(isPalindrome("RaCeCaR"));
//console.log(isPalindrome("rac3car"));
//console.log(isPalindrome("rac_car"));
//console.log(isPalindrome("$an$na$"));
//console.log(isPalindrome("bb"));
//console.log(isPalindrome("a"));
//console.log(isPalindrome("Amore, Romai."));
//console.log(isPalindrome("A man, a plan, a canal: Panama."));
//console.log(isPalindrome("Dammit I'm mad. Evil is a deed as I live. God, am I reviled? I rise, my bed on a sun, I melt. To be not one man emanating is sad. I piss. Alas, it is so late. Who stops to help? Man, it is hot. I'm in it. I tell. I am not a devil. I level \"Mad Dog\". Ah, say burning is, as a deified gulp, In my halo of a mired rum tin. I erase many men. Oh, to be man, a sin. Is evil in a clam? In a trap? No. It is open. On it I was stuck. Rats peed on hope. Elsewhere dips a web. Be still if I fill its ebb. Ew, a spider… eh? We sleep. Oh no! Deep, stark cuts saw it in one position. Part animal, can I live? Sin is a name. Both, one… my names are in it. Murder? I'm a fool. A hymn I plug, deified as a sign in ruby ash, A Goddam level I lived at. On mail let it in. I'm it. Oh, sit in ample hot spots. Oh wet! A loss it is alas (sip). I'd assign it a name. Name not one bottle minus an ode by me: \"Sir, I deliver. I'm a dog\" Evil is a deed as I live. Dammit I'm mad."));
//console.log(isPalindrome("A Toyota's a Toyota."));
//console.log(isPalindrome("wow"));
//console.log(isPalindrome("Never odd or even"));