Grains

Challenge Overview

Calculate the number of grains of wheat on a chessboard given that the number on each square doubles.

Visit the grains 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 @glennj (⭐ 6) — View on Exercism
Solution 2 by @jimpjorps (⭐ 0) — View on Exercism
Solution 3 by @rado-h (⭐ 0) — View on Exercism

Source: Exercism gleam/grains

💡 View Solution

pub type Error {
  InvalidSquare
}

pub fn square(square: Int) -> Result(Int, Error) {
  case 1 <= square && square <= 64 {
    True -> Ok(int.bitwise_shift_left(1, square - 1))
    False -> Error(InvalidSquare)
  }
}