From b80354d75b58858f9c90a9c52e2bceb1ee013cdb Mon Sep 17 00:00:00 2001
From: Jordan Gong <jordan.gong@protonmail.com>
Date: Mon, 17 Aug 2020 16:04:13 +0800
Subject: Match with `if let`

---
 matching/src/main.rs | 21 +++++++++++++++++----
 1 file changed, 17 insertions(+), 4 deletions(-)

(limited to 'matching/src/main.rs')

diff --git a/matching/src/main.rs b/matching/src/main.rs
index 55c41d0..1da48a0 100644
--- a/matching/src/main.rs
+++ b/matching/src/main.rs
@@ -11,23 +11,31 @@ enum Coin {
     Quarter(UsState),
 }
 
-fn value_in_cents(coin: Coin) -> u8 {
+fn value_in_cents(coin: &Coin) -> u8 {
     match coin {
         Coin::Penny => {
             println!("Lucky penny!");
             1
-        },
+        }
         Coin::Nickle => 5,
         Coin::Dime => 10,
         Coin::Quarter(state) => {
             println!("State quarter from: {:?}!", state);
             25
-        },
+        }
     }
 }
 
 fn main() {
-    value_in_cents(Coin::Quarter(UsState::Alaska));
+    let coin = Coin::Quarter(UsState::Alaska);
+    value_in_cents(&coin);
+
+    let mut count = 0;
+    if let Coin::Quarter(state) = coin {
+        println!("State quarter from: {:?}!", state);
+    } else {
+        count += 1;
+    }
 
     fn plus_one(x: Option<i32>) -> Option<i32> {
         match x {
@@ -48,4 +56,9 @@ fn main() {
         7 => println!("seven"),
         _ => (),
     }
+
+    let some_u8_value = Some(0u8);
+    if let Some(3) = some_u8_value {
+        println!("three");
+    }
 }
-- 
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