CSHARP

narcissistic

public static bool IsNarcissistic(int number)
{
  var sum = 0;
  var temp = number;
  var numberOfDigits = 0;
  while (temp != 0)
  {
    numberOfDigits++;
    temp /= 10;
  }

  temp = number;
  while (number > 0)
  {
    var remainder = number % 10;
    var power = (int)Math.Pow(remainder, numberOfDigits);

    sum += power;
    number /= 10;
  }

  return sum == temp;
}

Narcissistic

//153 = 1^3 + 5^3 + 3^3 = 1+125+27 = 153
//the above line shows the meaning of narcissistic,meaning sum of power of number should be 
//equal to that number 153===153
const isNarcissistic = (num) => {
   let m = 1, count = 0;
   while(num / m > 1){
      m *= 10;
      count++;
   };
   let sum = 0, temp = num;
   while(temp){
      sum += Math.pow(temp % 10, count);
      temp = Math.floor(temp / 10);
   };
   return sum === num;
};