Differences

This shows you the differences between two versions of the page.

--- devlogs:14_5_2022 [2022/05/14 20:03]
root
+++ devlogs:14_5_2022 [2023/10/19 15:25] (current)
@@ Line 13: / Line 13: @@
  name:(String),
  color:(u8,u8,u8), //Tuples can be stored
- //I DONT THING YOU CAN NEST ENUMS..... lmk bois
+ //I DONT THINK YOU CAN NEST ENUMS..... lmk bois
 }
 </code>
@@ Line 84: / Line 84: @@
 Matches must be **EXHAUSTIVE**.. or rust mama will yell.
-The two other special matching cases are __other__ and _____
+The two other special matching cases are __other__ and _____.
+[[https://doc.rust-lang.org/book/ch06-02-match.html| FR☺M THE RUST B☺☺K ]]
+<code rust>
+let dice_roll = 9;
+match dice_roll {
+=> add_fancy_hat(),
+=> remove_fancy_hat(),
+ other => move_player(other),
+}
+fn add_fancy_hat() {}
+fn remove_fancy_hat() {}
+fn move_player(num_spaces: u8) {}
+</code>
+Here the values 3 and 7 are covered. ALL OTHER VALUES ARE EVALUATED AS OTHER. We can also use _ which kind of does the same thing but will also work with values that are non-valid.
+<code rust>
+let dice_roll = 9
+match dice_roll {
+=> add_fancy_hat(),
+=> remove_fancy_hat(),
+ _ => (), // the () is an empty tuple and basically says "Yo, mr.code don't do anything".
+}
+fn add_fancy_hat() {}
+fn remove_fancy_hat() {}
+</code>
 ==== Modules ====
+Modules help break up code into reusable chunks. Kind of like namespaces.
+**A module is a collection of items: functions, structs, traits, impl and other modules.**
+Creating a module [[https://github.com/rust-lang/rustlings/tree/main/exercises/modules| FROM RUSTLINGS]]
+<code rust>
+mod sausage_factory {
+ // Don't let anybody outside of this module see this!
+ fn get_secret_recipe() -> String {
+  String::from("Ginger")
+ }
+ pub fn make_sausage() {
+  get_secret_recipe();
+  println!("sausage!");
+ }
+}
+fn main() {
+    sausage_factory::make_sausage();
+}
+</code>
+Another thing we can do with modules is bring them into scope to use them with shorthand names. This can be done with the **use .. as** syntax.
+<code rust>
+use std::time::UNIX_EPOCH as UNIX_EPOCH;
+use std::time::SystemTime as SystemTime;
+fn main() {
+ match SystemTime::now().duration_since(UNIX_EPOCH) {
+  Ok(n) => println!("1970-01-01 00:00:00 UTC was {} seconds ago!", n.as_secs()),
+  Err(_) => panic!("SystemTime before UNIX EPOCH!"),
+ }
+}
+</code>
+Yea man thats basically about it... why are you (([[https://www.youtube.com/watch?v=2HOClc6Svg4|here]]))
 ~~DISCUSSION | F's ~~

Ultra Letter Linker

User Tools

Site Tools

Differences

Page Tools