Rosetta Code

Narcissistic decimal number

Identify fixed sample numbers that equal the sum of their digits raised to the digit count.

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Sourcerosettacode/popular/narcissistic_decimal_number.vibe
def narcissistic?(value: int) -> bool
  digits = value.to_s.chars
  digits.sum { |digit| digit.to_i ** digits.length } == value
end

def run -> array<{ narcissistic: bool, value: int }>
  [153, 370, 407, 408].map { |value|
    { value:, narcissistic: narcissistic?(value) }
  }
end

Output

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