comments, flow control

branches/Cargo.toml

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

branches/src/main.rs

@@ -0,0 +1,20 @@
+fn main() {
+    let number = 3;
+    let b = if number < 5 { "duh" } else { "blwewew" };
+    println!("{number} {b}");
+
+    let mut x = 0.0;
+    let mut y = 0.0;
+    let q = 'outer: loop {
+        x += 0.1;
+        loop {
+            y += 0.1;
+            if y > 2.0 {
+                break 'outer y
+            }
+            println!("x: {}, y: {}", x, y);
+        }
+    };
+    println!("y: {q}");
+    println!((1..4))
+}

comments/Cargo.toml

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

comments/src/main.rs

@@ -0,0 +1,8 @@
+fn main() {
+    // this is a comment
+    /* is this a comment?
+     *
+     * looks like it
+     */
+    println!("Hello, world!");
+}

notes

@@ -80,4 +80,61 @@ Arrays:
 		let first = a[0];
 	they are allocated on stack
 
+https://doc.rust-lang.org/book/ch03-03-how-functions-work.html
 
+all function parameters must be annotated
+functions consist of statements and expressions
+statements perform an action and have no return value
+expressions do return something
+
+a scope block is an expression
+expressions do not end with a ";", if you add a ";" it will be statement
+return is explicit if the last statement in a function is an expression
+
+https://doc.rust-lang.org/book/ch03-04-comments.html
+comments
+
+// is a comment
+/* is also a comment
+b*/
+
+for some reason the doc didn't mention the second type..
+
+
+https://doc.rust-lang.org/book/ch03-05-control-flow.html
+control flow
+
+there is `if``
+
+block of code within the "if" are _arms_.
+just like the match
+
+if must recieve a bool
+no bad python
+if num {}
+
+if (thing) {
+    else if (other thing) {
+}   else if (yat) {
+}   else {
+}
+
+use `match` for too many else ifs
+
+if is an expression!
+
+you can loop with `loop`
+loop is an expression!
+
+break can return a value (not for for loops though they are a statement)
+break can select nest level with 'label
+
+thats called a loop label
+
+while loop exists
+for loop exists
+
+syntax: for x in y {}
+
+(start..end) is a Range
+(1..4).rev() is a thing