Cleanup iteration

src/day02/mod.rs

@@ -1,5 +1,6 @@
 use crate::read;
 
+#[derive(Clone)]
 struct Hand {
     pub letter: char
 }
@@ -72,34 +73,27 @@ impl Round {
 
 pub fn run() {
     let input = read("02");
-    let rounds = input.lines().map(|l| {
-        let hands = l.split(' ').collect::<Vec<_>>();
-        Round {
-            enemy: Hand {
-                letter: hands.first().unwrap().chars().next().unwrap(),
-            },
-            me: Hand {
-                letter: hands[1].chars().next().unwrap(),
-            },
-        }
-    }
-    ).collect::<Vec<_>>();
+    let rounds = input
+        .lines()
+        .map(|l| {
+            let hands = l
+                .split(' ')
+                .map(|s|Hand { letter: s.chars().next().unwrap() })
+                .collect::<Vec<_>>();
+            Round {
+                enemy: hands[0].clone(),
+                me: hands[1].clone(),
+            }
+        }).map(|r|(r.score(), r.score_b()))
+        .fold((0, 0), |agg, cur|(agg.0 + cur.0, agg.1 + cur.1));
 
     #[cfg(feature = "part1")]
     {
-        let a: i32 = rounds
-            .iter()
-            .map(|r|r.score())
-            .sum();
-        eprintln!("Day 2, Part 01: {}", a);
+        eprintln!("Day 2, Part 01: {}", rounds.0);
     }
 
     #[cfg(feature = "part2")]
     {
-        let b: i32 = rounds
-            .iter()
-            .map(|r|r.score_b())
-            .sum();
-        eprintln!("Day 2, Part 02: {}", b);
+        eprintln!("Day 2, Part 02: {}", rounds.1);
     }
 }