Rust learning: lessons, notes, and exercise crates

learn_enum/.gitignore

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+/target

learn_enum/Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "learn_enum"
+version = "0.1.0"

learn_enum/Cargo.toml

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+[package]
+name = "learn_enum"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]

learn_enum/src/main.rs

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+enum IpVer {
+    V4(String),
+    V6(String),
+}
+
+enum Coin {
+    Penny,
+    Nickel,
+    Dime,
+    Quarter(String),
+}
+
+fn main() {
+    println!("Hello, world!");
+
+    let home = IpVer::V4("192.14.1.1".into());
+    let loopback = IpVer::V6("::1".into());
+    value_in_cents(Coin::Quarter("alaska".to_string()));
+
+    let config_max = Some(3u8);
+    match config_max {
+        Some(max) => println!("the maximum is configure to be {max}"),
+        _ => (),
+    }
+
+    if let Some(max) = config_max
+        && max < 4
+    {
+        println!("Maximum is {max}");
+    }
+}
+
+fn value_in_cents(coin: Coin) -> u8 {
+    match coin {
+        Coin::Penny => {
+            println!("Lucky Penny");
+            1
+        }
+        Coin::Nickel => 5,
+        Coin::Dime => 10,
+        Coin::Quarter(s) => {
+            println!("from state {s}");
+            25
+        }
+    }
+}