started book again

book/notes

@@ -0,0 +1,60 @@
+chapter 2
+https://doc.rust-lang.org/book/ch02-00-guessing-game-tutorial.html
+
+include packages:
+  using std::io;
+
+print is a macro:
+  println!("text");
+
+make a new mutable string:
+  let mut guess = String::new();
+  // new is a function of the string type.
+  // an "associated function"
+
+& is a reference
+
+result is an enumeration
+it's variants are "Ok" and "Err"
+
+
+There are a set of "items" defined before importing anything. This is called the "prelude".
+
+
+chapter 1
+https://doc.rust-lang.org/book/ch01-00-getting-started.html
+
+linux:
+  curl --proto '=https' --tlsv1.2 https://sh.rustup.rs -sSf | sh
+
+update:
+  rustup update
+
+docs:
+  rustup doc
+
+compiler is `rustc`
+
+cargo --version
+
+toml = toms obvious minimal language
+
+new project:
+  cargo new $project_name --vcs=none
+
+$project_dir/
+$project_dir/Cargo.toml
+$project_dir/src/main.rs
+$project_dir/target/debug/$project_bin
+
+build:
+  cargo build
+
+run:
+  cargo run
+
+don't compile, just check:
+  cargo check
+
+don't add debug symbols:
+  cargo build --release