my learning

Cargo.toml

@@ -5,4 +5,5 @@ members = [
     "jem/01_guessing_game",
     "jem/02_hello_world",
     "jem/03_structs",
+    "jem/04_enums",
 ]

jem/04_enums/Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "enums"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]

jem/04_enums/src/main.rs

@@ -0,0 +1,20 @@
+enum IpAddrKind {
+    V4,
+    V6,
+}
+
+enum IpAddr {
+    V4(u8, u8, u8, u8),
+    V6(String),
+}
+
+struct Addr {
+  v4: IpAddr::V4,
+  v6: Option<String>
+}
+
+fn main() {
+    let four = IpAddrKind::V4;
+    let home = IpAddr::V4(127, 0, 0, 1);
+    let loopback = IpAddr::V6(String::from("::1"));
+}

jem/enums.md

@@ -0,0 +1,5 @@
+## Enums
+
+### Anmerkung
+
+* keine null, sehr schön :-)

jem/structs.md

@@ -1,5 +1,17 @@
 ## Structs
 
+### Vererbung
+
+```rust
+#[derive(Debug)]
+struct User {
+    id: u64,
+    name: String,
+}
+```
+
+### Anmerkungen
+
 * Groß == Public / Klein == private?
 * String::from ist schon viel schreibarbeit ...
 * Lebensdauer wird interessant ...