X-Git-Url: https://git.ralfj.de/rust-101.git/blobdiff_plain/87eef0eb20858188744e529fb0c5f1282577b8e4..931a4309e60e7a4915cfbf88dee7f0c3e875a63f:/src/main.rs

diff --git a/src/main.rs b/src/main.rs
index fdc8f5f..06ad4b2 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,22 +1,44 @@
 // Welcome to Rust-101
 // ===================
-//
+// 
 // This is [Rust-101](https://www.ralfj.de/projects/rust-101/), a small *work-in-progress*
 // tutorial for the [Rust language](http://www.rust-lang.org/).
 // It is intended to be an interactive, hands-on course: I believe the only way to
 // *really* learn a language is to write code in it, so you should be coding during
-// the course. I am writing this tutorial with a tutorial situation in mind, i.e.,
+// the course. I am writing this with a tutorial situation in mind, i.e.,
 // with a teacher being around to guide students through the course and answer
 // questions as they come up. However, I think they may also be useful if you
-// work through them on your own. Just make sure to actually play with the code.
-// If you have any questions, maybe the "Additional Resources" below are useful.
+// work through them on your own, you will just have to show more initiative yourself:
+// Make sure you actually type some code. It may sound stupid to manually copy code
+// that you could duplicate through the clipboard, but it's actually helpful.
+// If you have questions, check out the "Additional Resources" below. In particular,
+// the IRC channel is filled with awesome people willing to help you! I spent
+// lots of time there ;-)
 // 
-// I will assume basic familiarity with programming, and hence not explain the basic
+// I will assume some familiarity with programming, and hence not explain the basic
 // concepts common to most languages. Instead, I will focus on what makes Rust special.
 //
+// Why Rust?
+// ---------
+// 
+// When you got here, I am kind of assuming that you already decided to give Rust at
+// least a look, so that I don't have to do much convincing here ;-) . But just in
+// case, here's why I think Rust is worth learning:<br/>
+// At this time, Rust is a language with a pretty unique set of goals. Rust aims to
+// achieve C++-style control over memory and execution behavior (like, static vs. dynamic
+// dispatch), which makes it possible to construct abstractions that carry no run-time
+// cost. This is combined this with providing the comfort of high-level functional languages
+// and guaranteeing safety (as in, the program will not crash). The vast majority of existing
+// languages sacrificies one of these goals for the other. In particular, the
+// first requirement rules out a garbage collector: Rust can run "mare metal".
+// In fact, Rust rules out more classes of bugs than languages that achieve safety
+// with a GC: Besides dangling pointers and double-free, Rust also prevents issues
+// such as iterator invalidation and race conditions.
+// 
+// 
 // Prerequisites
 // -------------
-//
+// 
 // You will need to have Rust installed, of course. It is available for download on
 // [the Rust website](http://www.rust-lang.org/). At this point, I plan to restrict
 // myself to stable Rust, so "Recommended" version is just right.
@@ -24,34 +46,44 @@
 // [the second chapter of The Book](https://doc.rust-lang.org/stable/book/installing-rust.html).
 // When you are done, running `cargo build` in the root of Rust-101 should successfully compile
 // all the code.
-//
+// 
 // Getting the source
 // ------------------
-//
+// 
 // You are meant to play around with the source code of the course as you go on, so please
 // fetch it from the [git repository](http://www.ralfj.de/git/rust-101.git) (also available
 // [on GitHub](https://github.com/RalfJung/rust-101)).
-//
+
 // Course Content
 // --------------
 // 
-// The actual course is in the partXX.rs files. I suggest you get started with
-// [the first part](part00.html), or jump directly to where you left off:
+// The actual course is in the partXX.rs files. The part 00-03 cover some basic of the language,
+// to give you a feeling for Rust's syntax and pervasive mechanisms like pattern matching and traits.
+// Parts 04-?? introduce the heart of the language, the mechanism making it different from anything
+// else out there.
+// 
+// I suggest you get started with [the first part](part00.html), or jump directly to where you left off:
 // 
 // * [Part 00](part00.html)
 // * [Part 01](part01.html)
-// * [Part 02](part02.html) (WIP)
+// * [Part 02](part02.html)
+// * [Part 03](part03.html)
+// * [Part 04](part04.html) (WIP)
 // * (to be continued)
 #![allow(dead_code, unused_imports, unused_variables)]
 mod part00;
 mod part01;
 mod part02;
+mod part03;
+mod part04;
+mod part05;
+mod part06;
 
 // To actually run the code of some part (after filling in the blanks, if necessary), simply edit the `main`
 // function.
 
 fn main() {
-    part00::part_main();
+    part00::main();
 }
 
 // Additional material