From 2e0eab1c03bef2bf34e6ecd6798db96184c9d522 Mon Sep 17 00:00:00 2001
From: Bauke <me@bauke.xyz>
Date: Mon, 3 Oct 2022 13:02:39 +0200
Subject: [PATCH] Use .retain().

---
 source/year_2021/day_03/mod.rs   | 12 ++++--------
 source/year_2021/day_04/bingo.rs |  6 +-----
 2 files changed, 5 insertions(+), 13 deletions(-)

diff --git a/source/year_2021/day_03/mod.rs b/source/year_2021/day_03/mod.rs
index 67018cc..d55d7aa 100644
--- a/source/year_2021/day_03/mod.rs
+++ b/source/year_2021/day_03/mod.rs
@@ -64,10 +64,8 @@ fn part_2(input: &str) -> Result<String> {
         .get(index)
         .ok_or_else(|| eyre!("Could not find most common bit"))?;
       let most_common = if bit >= &0 { '1' } else { '0' };
-      most_common_lines = most_common_lines
-        .into_iter()
-        .filter(|line| line.chars().nth(*index) == Some(most_common))
-        .collect();
+      most_common_lines
+        .retain(|line| line.chars().nth(*index) == Some(most_common));
       most_common_bits = count_bits(&most_common_lines.join("\n"))?;
     }
 
@@ -76,10 +74,8 @@ fn part_2(input: &str) -> Result<String> {
         .get(index)
         .ok_or_else(|| eyre!("Could not find least common bit"))?;
       let least_common = if bit < &0 { '1' } else { '0' };
-      least_common_lines = least_common_lines
-        .into_iter()
-        .filter(|line| line.chars().nth(*index) == Some(least_common))
-        .collect();
+      least_common_lines
+        .retain(|line| line.chars().nth(*index) == Some(least_common));
       least_common_bits = count_bits(&least_common_lines.join("\n"))?;
     }
   }
diff --git a/source/year_2021/day_04/bingo.rs b/source/year_2021/day_04/bingo.rs
index 03fddd2..6238b30 100644
--- a/source/year_2021/day_04/bingo.rs
+++ b/source/year_2021/day_04/bingo.rs
@@ -43,11 +43,7 @@ impl Bingo {
         return (self.boards.first().unwrap().clone(), number);
       }
 
-      self.boards = self
-        .boards
-        .into_iter()
-        .filter(|board| !board.has_won)
-        .collect();
+      self.boards.retain(|board| !board.has_won);
     }
 
     unreachable!()