Armstrong Numbers

Challenge Overview

Determine if a number is an Armstrong number.

Visit the armstrong-numbers exercise on Exercism to read the full instructions and download the exercise files.

Community Solutions

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The following are the top 3 community solutions by stars:

Solution 1 by @cxk99 (⭐ 11) — View on Exercism
Solution 2 by @f3rn0s (⭐ 1) — View on Exercism
Solution 3 by @dirkil (⭐ 0) — View on Exercism

Source: Exercism fsharp/armstrong-numbers

💡 View Solution

module ArmstrongNumbers

let isArmstrongNumber (number: int): bool = 
    let digits = number.ToString()
    let digitsLength = digits.Length

    digits
    |> Seq.map (string >> int) 
    |> Seq.sumBy (fun x -> pown x digitsLength)
    |> (=) number