armstrongNumber.js

// A Narcissistic Number (or Armstrong Number) is a positive number which is the sum of its own digits,
// each raised to the power of the number of digits in a given base. In this Kata, we will restrict ourselves to decimal (base 10).

// For example, take 153 (3 digits), which is narcisstic:

//     1^3 + 5^3 + 3^3 = 1 + 125 + 27 = 153
// and 1652 (4 digits), which isn't:

//     1^4 + 6^4 + 5^4 + 2^4 = 1 + 1296 + 625 + 16 = 1938
// The Challenge:

// Your code must return true or false (not 'true' and 'false') depending upon whether the given number is a Narcissistic number in base 10.
// This may be True and False in your language, e.g. PHP.

// Error checking for text strings or other invalid inputs is not required, only valid positive non-zero integers will be passed into the function.

/**
 *
 * @param {Number} number
 * @returns {Boolean}
 */
function narcissistic(value) {
  let arrNum = Array.from(String(value), Number);

  let sumArrNum = 0;
  for (let i = 0; i < arrNum.length; i++) {
    sumArrNum += arrNum[i] ** arrNum.length;
  }

  return sumArrNum === value ? true : false;
}

console.log(narcissistic(93084));