
Armstrong Number Checking

In number theory, an Armstrong number (after Michael F. Armstrong) or narcissistic number in a given number base (10 for this mission) is a number that is the sum of its own digits each raised to the power of the number of digits. For example, 153 is an Armstrong number because 13 + 53 + 33 == 153
.
Input: Integer (number).
Output: Logic value (boolean).
Examples:
assert.strictEqual(isArmstrong(153),...
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