Just another update

Task/Palindrome-detection/JavaScript/palindrome-detection-1.js

@@ -1,5 +1,9 @@
-String.prototype.reverse = function(){ return this.split("").reverse().join(""); }
+function reverseString(str){
+  return str.split("").reverse().join("");
+}
 
-function palindrome(str) { return str == str.reverse(); }
+function isPalindrome(str) {
+  return str == reverseString(str);
+}
 
-alert(palindrome("ingirumimusnocteetconsumimurigni"));
+alert(isPalindrome("ingirumimusnocteetconsumimurigni"));

Task/Palindrome-detection/JavaScript/palindrome-detection-2.js

@@ -1,15 +1,17 @@
-String.prototype.reverse = function () {
-    return this.split('').reverse().join('');
+function reverseStr(s) {
+  var i, o = '';
+  for (i = s.length - 1; i >= 0; o += s[i--]);
+  return o;
 };
 
-String.prototype.isPalindrome = function () {
-    var s = this.toLowerCase().replace(/[^a-z]/g, '');
-    return (s.reverse() === s);
+function isPalindrome(str) {
+    var s = str.toLowerCase().replace(/[^a-z]/g, '');
+    return (reverseStr(s) === s);
 };
 
-('A man, a plan, a canoe, pasta, heros, rajahs, ' +
-'a coloratura, maps, snipe, percale, macaroni, ' +
-'a gag, a banana bag, a tan, a tag, ' +
-'a banana bag again (or a camel), a crepe, pins, ' +
-'Spam, a rut, a Rolo, cash, a jar, sore hats, ' +
-'a peon, a canal – Panama!').isPalindrome();
+isPalindrome('A man, a plan, a canoe, pasta, heros, rajahs, ' +
+             'a coloratura, maps, snipe, percale, macaroni, ' +
+             'a gag, a banana bag, a tan, a tag, ' +
+             'a banana bag again (or a camel), a crepe, pins, ' +
+             'Spam, a rut, a Rolo, cash, a jar, sore hats, ' +
+             'a peon, a canal – Panama!');