Dabbling in Rust, 2023 Day 01

2023/rust/Cargo.lock

+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "advent_of_code"
+version = "0.1.0"

2023/rust/Cargo.toml

+[package]
+name = "advent_of_code"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

2023/rust/src/main.rs

+fn day01(data: Vec<&str>) -> u32 {
+    let mut values: Vec<u32> = Vec::new();
+    for datum in data {
+        let mut first_digit: Option<u32> = None;
+        let mut last_digit: Option<u32> = Option::from(0);
+        for character in datum.chars() {
+            if character.is_digit(10) {
+                if first_digit == None {
+                    first_digit = character.to_digit(10);
+                }
+                last_digit = character.to_digit(10);
+            }
+        }
+        if first_digit == None {
+            first_digit = Option::from(0);
+        }
+        values.push(10 * first_digit.expect("this shouldn't happen") + last_digit.expect("this shouldn't happen"));
+    }
+    let mut value: u32 = 0;
+    return loop {
+        if values.is_empty() {
+            break value;
+        } else {
+            value += values.pop().expect("this really shouldn't happen");
+        }
+    }
+}
+
+fn main() {
+    println!("Hello, world!");
+    let day01a_data = vec!["1abc2", "pqr3stu8vwx", "a1b2c3d4e5f", "treb7uchet"];
+    let day01b_data = vec!["two1nine", "eightwothree", "abcone2threexyz", "xtwone3four",
+                           "4nineeightseven2", "zoneight234", "7pqrstsixteen"];
+    println!("{}", day01(day01a_data));
+    // day01(day01b_data);
+}
\ No newline at end of file