Add errors exercise

exercise/errors/src/main.rs

@@ -0,0 +1,62 @@
+// START IN lib.rs!
+
+use aquarium::Orca;
+
+// (You already did #1 in lib.rs, right?)
+// 2a. Uncomment and finish the play_time function below
+// - Bring anyhow::Result into scope with a `use` statement
+// - Have the function return a Result<Vec<String>>. The vector of Strings will represent successful
+//   outcomes of various performances.
+
+// fn play_time(orca: &Orca) -> ... {
+//     let mut responses = vec![];
+//     // 2b. There are three methods on the Orca struct:
+//     // - .say_your_name()
+//     // - .flip()
+//     // - .shake_hands()
+//     //
+//     // For each of the three methods above:
+//     // - Call the method on `orca`, using the `?` operator to unwrap the value / return the error
+//     // - Push the unwrapped string onto the `responses` vector using the .push() method
+
+//     // let response = ...    // this can be done with an intermediate variable...
+//     // responses.push( ... ) // ...or all on one line. Either way is fine!
+
+//     Ok(responses)
+// }
+
+fn main() {
+    let orcas = vec![
+        Orca {
+            name: "Augustinius".into(),
+            age: 7,
+            hungry: false,
+        },
+        Orca {
+            name: "Bitty".into(),
+            age: 2,
+            hungry: true,
+        },
+        Orca {
+            name: "Carson".into(),
+            age: 5,
+            hungry: true,
+        },
+        Orca {
+            name: "Devin".into(),
+            age: 6,
+            hungry: false,
+        },
+    ];
+    for orca in &orcas {
+        match play_time(orca) {
+            Ok(responses) => {
+                println!("{} did a FABULOUS PERFORMANCE!", orca.name);
+                for response in responses {
+                    println!("  {}", response);
+                }
+            }
+            Err(e) => println!("{} can't perform today: {}", orca.name, e.to_string()),
+        }
+    }
+}