import 'dart:math';

class ArmstrongNumbers {
  bool isArmstrongNumber(int n) {
    int len = n.toString().length;
    int raise(int digit) => pow(digit, len);
    int result = n
        .toString()
        .split('')
        .map((char) => int.parse(char))
        .map((digit) => raise(digit))
        .fold(0, (a, b) => a + b);
    return result == n;
  }
}
//    6  28 eglot... Dart analysis server: The return type 'num' isn't a 'int', as defined by the method 'raise'.