Initial commit

solutions/13_error_handling/errors1.rs

@@ -0,0 +1,37 @@
+fn generate_nametag_text(name: String) -> Result<String, String> {
+    //                                    ^^^^^^         ^^^^^^
+    if name.is_empty() {
+        // `Err(String)` instead of `None`.
+        Err("Empty names aren't allowed".to_string())
+    } else {
+        // `Ok` instead of `Some`.
+        Ok(format!("Hi! My name is {name}"))
+    }
+}
+
+fn main() {
+    // You can optionally experiment here.
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn generates_nametag_text_for_a_nonempty_name() {
+        assert_eq!(
+            generate_nametag_text("Beyoncé".to_string()).as_deref(),
+            Ok("Hi! My name is Beyoncé"),
+        );
+    }
+
+    #[test]
+    fn explains_why_generating_nametag_text_fails() {
+        assert_eq!(
+            generate_nametag_text(String::new())
+                .as_ref()
+                .map_err(|e| e.as_str()),
+            Err("Empty names aren't allowed"),
+        );
+    }
+}