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.

palindrome

/*
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.
*/

function findLargestPalindrome(n){
//grab the amount of digits
//start with the 9th batch
  var nDigits = Math.pow(10,n-1);
  var nStart = nDigits *9;
  var n1 = nStart, n2 = nStart; 
  var aPalindromes = [];
  function testPalindrome(k){ 
    
    //the result toString()
    //create two variables s1 and s2 storing one half of the string 
    // s1.split('').join()  and s2.split('reverse').join()
    var s1 = k.toString().substr(0,n).split('').join(''), 
    s2 = k.toString().substr(n,n).split('').reverse().join('');
    if(s1 === s2){ return true; }
      else{  return false ;} 
  }
  
//create loops of number a * b
  for (var i = n1; i < n1 + nDigits; i++) {
    for (var j = n2; j < n2 + nDigits; j++) {
      var k = i * j;
      if( testPalindrome(k) ){
      //if s1 == s2 store it in array
        aPalindromes.push(k);  
      }
    };
  };
  //find max in the array
  console.log(aPalindromes);
  return Math.max.apply( null, aPalindromes );
 }