JAVASCRIPT

how to check the number is palindrome or not

function isPalindrome(num) {
   const temp = num.toString().split('').reverse().join('') * 1;
   return (result = num === parseInt(temp) ? true : false);
}

console.log(isPalindrome(121));
console.log(isPalindrome(320));

is palindrome

const isPalindrome = (str) => {
    
    const preprocessing_regex = /[^a-zA-Z0-9]/g,
    processed_string = str.toLowerCase().replace(preprocessing_regex , ""),
    integrity_check = processed_string.split("").reverse().join("");
    if(processed_string === integrity_check) return true
    else return false
         
        }

//if you find this answer is useful ,
//upvote ⇑⇑ , so can the others benefit also . @mohammad alshraideh ( ͡~ ͜ʖ ͡°)

check for palindromes

function palindrome(str) {
  var re = /[W_]/g;// representing Non-alphanumetic characters
  var lowRegStr = str.toLowerCase().replace(re, '');
  var reverseStr = lowRegStr.split('').reverse().join(''); 
  return reverseStr === lowRegStr;
}
palindrome("A man, a plan, a canal. Panama");

check if string is a palindrome

<script>
  // function that check str is palindrome or not
  function check_palindrome( str )
  {
    let j = str.length -1;
    for( let i = 0 ; i < j/2 ;i++)
    {
      let x = str[i] ;//forward character
      let y = str[j-i];//backward character
      if( x != y)
      {
        // return false if string not match
        return false;
      }
    }
    /// return true if string is palindrome
    return true;
     
  }
 
  //function that print output is string is palindrome
  function is_palindrome( str )
  {
    // variable that is true if string is palindrome
    let ans = check_palindrome(str);
    //condition checking ans is true or not
    if( ans == true )
    {
      console.log("passed string is palindrome ");
    }
    else
    {
      console.log("passed string not a palindrome");
    }
  }
  // test variable
  let test = "racecar";
  is_palindrome(test);
</script>

check if palindrome

function isPalindrome(str) {
  str = str.toLowerCase();
  return str === str.split("").reverse().join("");
}

fastest way to check a number is palindrome

function palindromeNumber(num) {
  	let numStr = num.toString();
    return numStr === numStr.toString().split("").reverse().join("");
}

what is palindrome

function Palindrome(str) { 

  str = str.replace(/ /g,"").toLowerCase();
  var compareStr = str.split("").reverse().join("");

  if (compareStr === str) {
    return true;
  } 
  else {
    return false;
  } 

}

palindrome short way

function palindrome2(str) {
	return str.toLowerCase() === str.toString().toLowerCase().split('').reverse().join('') ? true : false;
}

can be palindrome

// can we generate palindrome string by suffling 
// the character of the string s 
public bool CanBePalindrome(string s)
{
    var dict = new Dictionary<char, int>();
    for (int j =0; j < s.Length; j++)
    {
        var item = s[j];
        if (dict.ContainsKey(item))
        {
            dict[item]++;
            if (dict[item] == 2)
            {
                dict.Remove(item);
            }
        }
        else
        {
            dict.Add(item, 1);
        }
    }
    return dict.Count <= 1;
}