From dbc2a91b15e6670af563ff78889ffb258bf00edf Mon Sep 17 00:00:00 2001
From: Adam Millerchip <adam@millerchip.net>
Date: Thu, 7 Nov 2019 11:12:57 +0900
Subject: [PATCH] Use a binary comprehension

Instead of converting to a charlist and back.
---
 sample/lib/line_bot_sample.ex | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/sample/lib/line_bot_sample.ex b/sample/lib/line_bot_sample.ex
index e0b65b4..0fa8217 100644
--- a/sample/lib/line_bot_sample.ex
+++ b/sample/lib/line_bot_sample.ex
@@ -182,9 +182,7 @@ defmodule LineBotSample do
       code
       |> String.trim()
       |> String.upcase()
-      |> String.to_charlist()
-      |> Enum.map(&(&1 + 0x1F1A5))
-      |> List.to_string()
+      |> (&for(<<cp::utf8 <- &1>>, into: "", do: <<cp + 0x1F1A5::utf8>>)).()
 
     log_and_reply(request_message, %Message.Text{text: code}, reply_token)
   end