if_let

18-if_let/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "if_let"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

18-if_let/src/main.rs

@@ -0,0 +1,42 @@
+enum Vehicle
+    {
+        Car,
+        Bus,
+        Truck,
+        Bicycle,
+        Scooter,
+    }
+fn main() 
+    {
+        println!("Hello, world!");
+
+        let vehicle1 = Vehicle::Car;
+        let vehicle2 = Vehicle::Bus;
+        let vehicle3 = Vehicle::Truck;
+
+        let vehicles = [vehicle1,vehicle2,vehicle3];
+
+        for i in vehicles
+            {
+                // it's like match actually
+                // but less boilerplate
+                // this does not force us to cover all posibilities
+                // but it can, if you want
+                if let i == Vehicle::Car
+                    {
+                        println!("{} is Car", i);
+                    }
+                if let i == Vehicle::Bus
+                    {
+                        println!("{} is Bus", i);
+                    }
+                if let i == Vehicle::Truck
+                    {
+                        println!("{} is Truck", i);
+                    }
+                else
+                    {
+                        println!("{} is Another Thing", i);
+                    }
+            }
+    }