vault backup: 2025-03-24 09:38:53

3-99 Research/Rust/Chapter 2 - Guessing Game.md

@@ -4,3 +4,24 @@ a random number, and compares the two to say whether the guess is correct,
 lower, or higher. It introduces us to key concepts in Rust such as module
 importing, the idea of mutability, how to define variables, and other 
 interesting type things.
+
+## Breaking Down some things
+### Types, and variants
+When creating the variable `guess` we created it as 
+
+```rust
+let mut guess = String::new();
+```
+
+where we call `String::new()`. `String` is a type, that has a function `new` 
+integrated into that type.
+
+Then, we read in the data. Some interesting things happen here:
+1. We use `&mut guess` where `&` signifies a *reference* to an object
+2. We have an `.expect()`
+    a. `.read_line` returns a string, but it also returns a result
+    b. This result is an *enumeration* type, with each possible 
+    result being a *variant*. 
+
+Wacky stuff.
+