Conditionals

Raindrops
Raindrops in Crystal 
module Raindrops
  def self.convert(count : Int32) : String
    result = ""
    result += "Pling" if count.divisible_by?(3)
    result += "Plang" if count.divisible_by?(5)
    result += "Plong" if count.divisible_by?(7)
    result.empty? ? count.to_s : result
  end
end

This approach uses a series of if's suffix statements to build a string. It starts by creating an empty String. Then based on if the number is divisible by 3, 5, or 7, it adds the appropriate string to the result. The String added needs to be added in the correct order, otherwise the result would be reversed. Finally, if the result is empty, it returns the number as a String, otherwise it returns the result. It uses implicit return to return the result.

11th Sep 2024 · Found it useful?

Other Approaches to Raindrops in Crystal

Other ways our community solved this exercise
module Raindrops
  DROPS = {3 => "Pling", 5 => "Plang", 7 => "Plong"}
  def self.convert(number : Int)
    DROPS.join { |k, v| v if number.divisible_by?(k) }.presence || number.to_s
  end
end
Data Driven

Using a data driven approach to conditionally add text to a string