Match pattens

3 files changed, 78 insertions, 0 deletions

diff --git a/matching/.gitignore b/matching/.gitignore
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+
+# Created by https://www.toptal.com/developers/gitignore/api/rust
+# Edit at https://www.toptal.com/developers/gitignore?templates=rust
+
+### Rust ###
+# Generated by Cargo
+# will have compiled files and executables
+/target/
+
+# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
+# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
+Cargo.lock
+
+# These are backup files generated by rustfmt
+**/*.rs.bk
+
+# End of https://www.toptal.com/developers/gitignore/api/rust
+
diff --git a/matching/Cargo.toml b/matching/Cargo.toml
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+[package]
+name = "matching"
+version = "0.1.0"
+authors = ["Jordan Gong <jordan.gong@protonmail.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
diff --git a/matching/src/main.rs b/matching/src/main.rs
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+#[derive(Debug)]
+enum UsState {
+    Alabama,
+    Alaska,
+}
+
+enum Coin {
+    Penny,
+    Nickle,
+    Dime,
+    Quarter(UsState),
+}
+
+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));
+
+    fn plus_one(x: Option<i32>) -> Option<i32> {
+        match x {
+            None => None,
+            Some(x) => Some(x + 1),
+        }
+    }
+
+    let five = Some(5);
+    let six = plus_one(Some(5));
+    let none = plus_one(None);
+
+    let some_u8_value = 0u8;
+    match some_u8_value {
+        1 => println!("one"),
+        3 => println!("three"),
+        5 => println!("five"),
+        7 => println!("seven"),
+        _ => (),
+    }
+}