Nodejs String Reverse reverse()

Method Source Code

"use strict";//from  ww  w  .  j  av  a 2 s .  c  om

/**
  A palindromic number reads the same both ways. The largest palindrome made from the product of two 2-digit numbers is 9009 = 91 ? 99.
  Find the largest palindrome made from the product of two 3-digit numbers.
*/

String.prototype.reverse = function () {
    return this.split("").reverse().join("");
}

var isPalindrom = function(n) {
   var s = n.toString();
   return s === s.reverse();
}

var max = 0;
for (var i=100; i<1000; i++) {
   for (var j=100; j<1000; j++) {
      var k = i*j;
      if (k > max && isPalindrom(k)) {
         console.log(i + " * " + j + " = " + k);
         max = k;
      }
   }
}
// -> 913 * 993 = 906609

Related

1. reverse()

   String.prototype.reverse = function () {
       return this.split('').reverse().join('');
   };
   String.prototype.isPalindrome = function () {
       var s = this.toLowerCase().replace(/[^a-z]/g, '');
       return (s.reverse() === s);
   };
   ('A man, a plan, a canoe, pasta, heros, rajahs, ' +
   'a coloratura, maps, snipe, percale, macaroni, ' +
   ...
   

2. reverse()

   String.prototype.reverse=function(){
     var arr=this.toCharArray();
     return arr.reverse().join("");
   

3. reverse()

   function reverseWordsInString(str) {
       var words = str.split(' ');
       var resultStr = '';
       for (var w in words) {
           resultStr += words[w].reverse() + ' ';
       return resultStr;
   String.prototype.reverse = function () {
   ...
   

4. reverse()

   String.prototype.reverse = function () {
       'use strict';
       var s = "",
           i = this.length;
       while (i > 0) {
           s += this.substring(i - 1, i);
           i--;
       return s;
   ...
   

5. reverse()

   String.prototype.reverse = function(){
     var charArray = this.split('');
     var charArrayLength = charArray.length;
     var reverseMessage = '';
     for(var i = charArrayLength-1;i>=0;i--){
       reverseMessage+=charArray[i];
     return reverseMessage;
   };
   ...
   

6. reverse()

   String.prototype.reverse = function() {
       var result = "";
       for (var i = this.length -1 ; i >= 0; i--){
           result += this.charAt(i);
       return result;
   };
   

7. reverse()

   String.prototype.reverse = function(){
     var newString = "";
     for (var i = this.length - 1; i >= 0; i--) {
       newString = newString + this[i];
     };
     return newString;
   var name = "freak yeah I\'m writing strings up in hurr!!"
   name.reverse();
   ...
   

8. reverse()

   String.prototype.reverse = function(){
     var returnedString = string.split('');
     returnedString.reverse();
     var string = this.join('');
   };
   String.prototype.reverse = function(){
     return this.split('').reverse().join('');
   var test = 'Cruncha muncha cruncha muncha fritos in my butt';
   ...
   

9. reverse()

   String.prototype.reverse = function() {
       var s = this;
       var o = '';
       for (var i = s.length - 1; i >= 0; i--)
           o += s[i];
       return o;
   var fs  = require("fs");
   fs.readFileSync(process.argv[2]).toString().split('\n').forEach(function (line) {
   ...