comments, flow control

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