day1 part1

2023/day-01/Cargo.toml

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+[package]
+name = "day-01"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[[bin]]
+name = "part1"
+path = "src/part1.rs"
+[[bin]]
+name = "part2"
+path = "src/part2.rs"
+
+[dependencies]

2023/day-01/src/part1.rs

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+fn main() {
+    let input = include_str!("./input.txt");
+    let output = process(input);
+    println!("{}", output);
+}
+
+fn process(input: &str) -> i32 {
+    let lines: i32 = input
+        .lines()
+        .into_iter()
+        .map(|line| {
+            let line_vec = line
+                .chars()
+                .filter(|c| c.is_digit(10))
+                .collect::<Vec<char>>();
+            let first = line_vec.clone().into_iter().nth(0);
+            let last = line_vec.clone().into_iter().nth_back(0);
+            [first.unwrap(), last.unwrap()].into_iter().collect()
+        })
+        .collect::<Vec<String>>()
+        .iter()
+        .map(|x| x.parse::<i32>().unwrap())
+        .sum();
+    lines
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    #[test]
+    fn test_logic() {
+        let input = include_str!("./testinput.txt");
+        assert_eq!(process(input), 142);
+    }
+}

2023/day-01/src/testinput.txt

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+1abc2
+pqr3stu8vwx
+a1b2c3d4e5f
+treb7uchet