30 seconds of code

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Checks if the given number is an Armstrong number or not.

Convert the given number into an array of digits. Use the exponent operator (**) to get the appropriate power for each digit and sum them up. If the sum is equal to the number itself, return true otherwise false.

const isArmstrongNumber = digits =>
  (arr => arr.reduce((a, d) => a + parseInt(d) ** arr.length, 0) == digits)(
    (digits + '').split('')