initial commit

exercises/05_ticket_v2/04_if_let/Cargo.toml

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+[package]
+name = "if_let"
+version = "0.1.0"
+edition = "2021"

exercises/05_ticket_v2/04_if_let/src/lib.rs

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+enum Shape {
+    Circle { radius: f64 },
+    Square { border: f64 },
+    Rectangle { width: f64, height: f64 },
+}
+
+impl Shape {
+    // TODO: Implement the `radius` method using
+    //  either an `if let` or a `let/else`.
+    pub fn radius(&self) -> f64 {
+        todo!()
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_circle() {
+        let _ = Shape::Circle { radius: 1.0 }.radius();
+    }
+
+    #[test]
+    #[should_panic]
+    fn test_square() {
+        let _ = Shape::Square { border: 1.0 }.radius();
+    }
+
+    #[test]
+    #[should_panic]
+    fn test_rectangle() {
+        let _ = Shape::Rectangle {
+            width: 1.0,
+            height: 2.0,
+        }
+        .radius();
+    }
+}