Imperative style implementation for CodeWars exercise https://www.codewars.com/kata/take-a-number-and-sum-its-digits-raised-to-the-consecutive-powers-and-dot-dot-dot-eureka/

sumDigPow-imperative.js

function sumDigPow(a, b) {
  const arr = [];
  for (let i = a; i <= b; i++) {
    let sum = 0;
    for (let j = 0; j <= String(i).length; j++) {
      sum += Math.pow(parseInt(String(i)[j]), j+1);  
      if (sum == i) arr.push(i);
    }
  }
  return arr;
}

console.log(sumDigPow(0, 150)); // [ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 89, 135 ]