enum

16-enumaration/Cargo.toml

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

16-enumaration/src/main.rs

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+// this is kind of null implemetation
+// but better
+// because we have to specify type
+// and compiler will make sure we can not be able to treat as a non null
+// <T> is generic type parameter we will learn later
+// for now it can accept any type of data
+// "T" can be everyting
+#[derive(Debug)]
+enum Option <T>
+    {
+        None,
+        Some(T),
+    }
+
+// this feels like event-driven programming
+// in this code, we basically have led states
+// that they have different type of associations
+// On state just keeps rgb color
+// Blink and Breath keeps rgb and time value
+// Off keeps nothing
+#[derive(Debug)]
+enum LedState
+    {
+        On(u8,u8,u8),
+        Blink(u8,u8,u8,u16),
+        Breath(u8,u8,u8,u16),
+        Off,
+    }
+impl LedState
+    {
+        // this is also method, like we did in structs
+        fn getter(&self) -> &Self
+            {
+                self
+            }
+    }
+
+fn main() 
+    {
+        println!("Hello, world!");
+
+        let green_light = LedState::On(0,255,0);
+        let red_breathing = LedState::Breath(255,0,0, 10);
+        let blue_blinking = LedState::Blink(0,0,255, 5);
+        let black = LedState::Off;
+
+        println!("State is = {:#?}", LedState::getter(&green_light));
+        println!("State is = {:#?}", LedState::getter(&red_breathing));
+        println!("State is = {:#?}", LedState::getter(&blue_blinking));
+        println!("State is = {:#?}", LedState::getter(&black));
+
+        let null:Option<u8> = Option::None;
+        let two = Option::Some(2);
+
+        println!("Value is = {:#?}", null);
+        println!("Value is = {:#?}", two);
+
+        // this is not going to work
+        // until we convert it
+        //println!("Total is = {}", 2+two);
+
+
+    }