Enum Option

Author: danjambur

Cargo.toml

@@ -13,5 +13,6 @@ members = [
     "./structs_rectangle",
     "./enums",
     "./enums_messages",
+    "./enums_option"
 ]
 

enums_option/Cargo.toml

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

enums_option/src/main.rs

@@ -0,0 +1,19 @@
+fn main() {
+    // T is a 'Generic'. Its type can literally be anything.
+    // This is just an example of what is already in the standard library.
+    // It's not really required for the following code
+    enum Option<T> {
+        None,
+        Some(T),
+    }
+
+    // its now an i32
+    let some_number = Some(5);
+    // its now a char
+    let some_char = Some('e');
+    // its now a string
+    let some_string = Some(String::from("Hello"));
+
+    let nothing: Option<String> = None;
+    // With Option, we need to define the type when we call 'Some' for example.
+}