From 363ea1a0243c137b2480c421404e5124770ed09b Mon Sep 17 00:00:00 2001
From: Justin Wernick <justin@worthe-it.co.za>
Date: Wed, 1 Dec 2021 10:13:48 +0200
Subject: Refactor out common code

---
 src/bin/day_1.rs | 49 +++++++++++++++++++++----------------------------
 src/parsers.rs   |  2 +-
 2 files changed, 22 insertions(+), 29 deletions(-)

diff --git a/src/bin/day_1.rs b/src/bin/day_1.rs
index 7b89d69..ca2e242 100644
--- a/src/bin/day_1.rs
+++ b/src/bin/day_1.rs
@@ -6,35 +6,18 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
     let input = fs::read_to_string("inputs/day_1.txt")?;
     let sonar_scan = parse_sonar_scan(&input).unwrap().1;
 
-    {
-        let mut simple_increase_counter = DepthIncreaseCounter::default();
-        for (depth, next_depth) in sonar_scan.iter().zip(sonar_scan.iter().skip(1)) {
-            if next_depth > depth {
-                simple_increase_counter.increment();
-            }
-        }
-        dbg!(simple_increase_counter);
-    }
+    let simple_increase_counter = count_increases(sonar_scan.iter());
+    dbg!(simple_increase_counter);
 
-    {
-        let windowed_sonar_scan = sonar_scan
-            .iter()
-            .zip(sonar_scan.iter().skip(1))
-            .zip(sonar_scan.iter().skip(2))
-            .map(|((depth1, depth2), depth3)| ThreeDepthWindowSum::new([*depth1, *depth2, *depth3]))
-            .collect::<Vec<_>>();
+    let windowed_sonar_scan = sonar_scan
+        .iter()
+        .zip(sonar_scan.iter().skip(1))
+        .zip(sonar_scan.iter().skip(2))
+        .map(|((depth1, depth2), depth3)| ThreeDepthWindowSum::new([*depth1, *depth2, *depth3]))
+        .collect::<Vec<_>>();
 
-        let mut windowed_increase_counter = DepthIncreaseCounter::default();
-        for (depth, next_depth) in windowed_sonar_scan
-            .iter()
-            .zip(windowed_sonar_scan.iter().skip(1))
-        {
-            if next_depth > depth {
-                windowed_increase_counter.increment();
-            }
-        }
-        dbg!(windowed_increase_counter);
-    }
+    let windowed_increase_counter = count_increases(windowed_sonar_scan.iter());
+    dbg!(windowed_increase_counter);
 
     Ok(())
 }
@@ -56,7 +39,7 @@ fn parse_sonar_scan(input: &str) -> IResult<&str, Vec<Depth>> {
 }
 
 fn parse_depth(input: &str) -> IResult<&str, Depth> {
-    map(parsers::u64, |number| Depth(number))(input)
+    map(parsers::u64, Depth)(input)
 }
 
 #[derive(Default, Debug)]
@@ -68,6 +51,16 @@ impl DepthIncreaseCounter {
     }
 }
 
+fn count_increases<T: Ord>(i: impl IntoIterator<Item = T> + Clone) -> DepthIncreaseCounter {
+    let mut increases = DepthIncreaseCounter::default();
+    for (depth, next_depth) in i.clone().into_iter().zip(i.into_iter().skip(1)) {
+        if next_depth > depth {
+            increases.increment();
+        }
+    }
+    increases
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
diff --git a/src/parsers.rs b/src/parsers.rs
index 27b2aad..c33a3cc 100644
--- a/src/parsers.rs
+++ b/src/parsers.rs
@@ -2,5 +2,5 @@ use nom::{character::complete::digit1, combinator::map_res, IResult};
 use std::str::FromStr;
 
 pub fn u64(input: &str) -> IResult<&str, u64> {
-    map_res(digit1, |number| u64::from_str(number))(input)
+    map_res(digit1, u64::from_str)(input)
 }
-- 
cgit v1.2.3