From 0a7aea65e1b89602b44fe2b5ee94dc92e96d0547 Mon Sep 17 00:00:00 2001
From: Matej Focko <me@mfocko.xyz>
Date: Sun, 2 Jul 2023 23:13:08 +0200
Subject: [PATCH] day(23): introduce a helper function for DRY

Signed-off-by: Matej Focko <me@mfocko.xyz>
---
 src/bin/day23.rs | 34 ++++++++++++++--------------------
 1 file changed, 14 insertions(+), 20 deletions(-)

diff --git a/src/bin/day23.rs b/src/bin/day23.rs
index 98f3384..1464a3f 100644
--- a/src/bin/day23.rs
+++ b/src/bin/day23.rs
@@ -132,17 +132,20 @@ fn _show_ground_with_dimensions(
     }
 }
 
+fn get_bounds(positions: &Input) -> (Vector2D<isize>, Vector2D<isize>) {
+    let f = |init, cmp: &dyn Fn(isize, isize) -> isize| {
+        positions
+            .iter()
+            .fold(Vector2D::new(init, init), |acc, elf| {
+                Vector2D::new(cmp(acc.x(), elf.x()), cmp(acc.y(), elf.y()))
+            })
+    };
+
+    (f(isize::MAX, &min::<isize>), f(isize::MIN, &max::<isize>))
+}
+
 fn _show_ground(positions: &Input) {
-    let min_pos = positions
-        .iter()
-        .fold(Vector2D::new(isize::MAX, isize::MAX), |acc, elf| {
-            Vector2D::new(min(acc.x(), elf.x()), min(acc.y(), elf.y()))
-        });
-    let max_pos = positions
-        .iter()
-        .fold(Vector2D::new(isize::MIN, isize::MIN), |acc, elf| {
-            Vector2D::new(max(acc.x(), elf.x()), max(acc.y(), elf.y()))
-        });
+    let (min_pos, max_pos) = get_bounds(positions);
 
     _show_ground_with_dimensions(
         positions,
@@ -183,16 +186,7 @@ impl Solution<Input, Output> for Day23 {
             // show_ground_with_dimensions(&positions, -3, 10, -2, 9);
         }
 
-        let min_pos = positions
-            .iter()
-            .fold(Vector2D::new(isize::MAX, isize::MAX), |acc, elf| {
-                Vector2D::new(min(acc.x(), elf.x()), min(acc.y(), elf.y()))
-            });
-        let max_pos = positions
-            .iter()
-            .fold(Vector2D::new(isize::MIN, isize::MIN), |acc, elf| {
-                Vector2D::new(max(acc.x(), elf.x()), max(acc.y(), elf.y()))
-            });
+        let (min_pos, max_pos) = get_bounds(&positions);
 
         (max_pos.x() - min_pos.x() + 1) * (max_pos.y() - min_pos.y() + 1)
             - (positions.len() as isize)