Created
February 10, 2016 17:31
-
-
Save sammylupt/4b7f509066d2acdec48f to your computer and use it in GitHub Desktop.
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
defmodule HappyNumberFinder do | |
def find(number) when number > 0 do | |
_find(number, []) | |
end | |
defp get_sum(number) do | |
number | |
|> Integer.digits | |
|> Enum.map(fn(x) -> x * x end) | |
|> Enum.reduce(fn(x, total) -> x + total end) | |
end | |
defp _find(number, guesses) do | |
case number in guesses do | |
true -> {:unhappy} | |
false -> compute_result(number, guesses) | |
end | |
end | |
defp compute_result(number, guesses) do | |
sum = get_sum(number) | |
case sum do | |
1 -> {:happy} | |
_ -> _find(sum, [number | guesses]) | |
end | |
end | |
end |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment