From 438e9cfd935aeef7aee45bd21f5e032dc9ed2506 Mon Sep 17 00:00:00 2001
From: Justin Lin <justin.sdk@gmail.com>
Date: Mon, 4 Apr 2022 15:35:21 +0800
Subject: [PATCH] refactor: extract lines

---
 examples/hollow_out/hollow_out_square.scad | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/examples/hollow_out/hollow_out_square.scad b/examples/hollow_out/hollow_out_square.scad
index 7be39ace..32f1fb4c 100644
--- a/examples/hollow_out/hollow_out_square.scad
+++ b/examples/hollow_out/hollow_out_square.scad
@@ -21,12 +21,11 @@ function h_lines_in_square(width) =
 function hollow_out_square(size, width) =
     let(
         columns = size[0],
-        rows = size[1]
+        rows = size[1],
+        lines = h_lines_in_square(width)
     )
     [
-        for(y = [0:width:width * rows - width], 
-            x = [0:width:width * columns - width], 
-            line = h_lines_in_square(width)
-        )
-        [for(p = line) p + [x, y]] 
+        for(y = [0:width:width * rows - width], x = [0:width:width * columns - width])
+        let(coord = [x, y])
+        for(line = lines) [for(p = line) p + coord] 
     ];
\ No newline at end of file