X-Git-Url: https://git.ralfj.de/rust-101.git/blobdiff_plain/8f2ba670de8b8b29f9bbb95ba8fa6ac382e2b745..931a4309e60e7a4915cfbf88dee7f0c3e875a63f:/src/main.rs

diff --git a/src/main.rs b/src/main.rs
index 46651b2..06ad4b2 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -5,7 +5,7 @@
 // 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, you will just have to show more initiative yourself:
@@ -15,8 +15,26 @@
 // 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
 // -------------
@@ -35,29 +53,37 @@
 // 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)
 // * [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