An <a href="https://en.wikipedia.org/wiki/Narcissistic_number" target="_blank" rel="noopener nofollow">Armstrong number</a> is a number that is the sum of its own digits each raised to the power of the number of digits.
For example:
<ul>
<li>9 is an Armstrong number, because <code class="rounded dark:bg-gray-800 dark:text-white text-black bg-gray-100 px-[0.25rem] py-[0.1rem] text-sm font-normal font-mono" data-prestyled="true">9 = 9^1 = 9</code></li>
<li>10 is not an Armstrong number, because <code class="rounded dark:bg-gray-800 dark:text-white text-black bg-gray-100 px-[0.25rem] py-[0.1rem] text-sm font-normal font-mono" data-prestyled="true">10 != 1^2 + 0^2 = 1</code></li>
<li>153 is an Armstrong number, because: <code class="rounded dark:bg-gray-800 dark:text-white text-black bg-gray-100 px-[0.25rem] py-[0.1rem] text-sm font-normal font-mono" data-prestyled="true">153 = 1^3 + 5^3 + 3^3 = 1 + 125 + 27 = 153</code></li>
<li>154 is not an Armstrong number, because: <code class="rounded dark:bg-gray-800 dark:text-white text-black bg-gray-100 px-[0.25rem] py-[0.1rem] text-sm font-normal font-mono" data-prestyled="true">154 != 1^3 + 5^3 + 4^3 = 1 + 125 + 64 = 190</code></li>
</ul>
Write some code to determine whether a number is an Armstrong number. Make use that the is <code class="rounded dark:bg-gray-800 dark:text-white text-black bg-gray-100 px-[0.25rem] py-[0.1rem] text-sm font-normal font-mono" data-prestyled="true">isArmstrongNumber()</code> is exported to run the test cases

Armstrong Numbers