handle errors

guessing_game/src/main.rs

@@ -14,10 +14,10 @@ fn main() {
     // vars are immutable by default, change this
     // The :: syntax in the ::new line indicates that new is an _associated function_ of the String
     //         a function that’s implemented on a type
-    let mut guess = String::new();
     // could still call this without importing it via std::io::stdin
     // this can be one line, it is broken up for readability.
     loop {
+        let mut guess = String::new();
         io::stdin()
             // & indicates that this argument is a reference,
             // references are also immutable by default so &mut is needed
@@ -29,7 +29,15 @@ fn main() {
         // Result's variants are Ok and Err
 
         // shadowing V
-        let guess: u32 = guess.trim().parse().expect("please type a number for the love of god");
+        // change from expect which crashes all the time to match
+        // to perform an action depending on the value of the enum
+        let guess: u32 = match guess.trim().parse() {
+            Ok(num) => num,
+            Err(_) => {
+                println!("that aint no number I ever heard of");
+                continue;
+            }
+        };
         // trim removes space and \n
         // single colon is type annotation
         //