Fix grammar to improve clarity

[rust-101.git] / src / main.rs

diff --git a/src/main.rs b/src/main.rs
index e151dc1ff49b3897650aea069a3521720af48a52..2a0aa76d30fd3b2524b1a10a3630db83f92f4302 100644 (file)
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,65 +1,116 @@
 // Welcome to Rust-101
 // ===================
 // 
 // 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 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:
-// 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
+// This is [Rust-101](https://www.ralfj.de/projects/rust-101/), a small tutorial for
+// the [Rust language](https://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.
+// 
+// If you have any questions that are not answered here, 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 some familiarity with programming, and hence not explain the basic
 // concepts common to most languages. Instead, I will focus on what makes Rust special.
 // lots of time there ;-)
 // 
 // 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?
+// ---------

 // 
 // 

-// Prerequisites
-// -------------
+// 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 with the comfort of high-level functional languages and guaranteed
+// safety (as in, the program will not crash in uncontrolled ways). The vast majority of existing
+// languages sacrifices control for safety (for example, by enforcing the usage of
+// a garbage collector) or vice versa. Rust can run without dynamic allocation (i.e., without
+// a heap), and even without an operating system. In fact, Rust rules out more classes of bugs
+// than languages that achieve safety with a garbage collector: Besides dangling pointers and
+// double-free, Rust also prevents issues such as iterator invalidation and data races. Finally,
+// it cleans up behind you, and deallocates resources (memory, but also file descriptors and really
+// anything) when you don't need them anymore.

 // 
 // 

-// 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.
-// You can find some more installation instructions in
-// [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
-// ------------------
+// Getting started
+// ---------------

 // 
 // 

-// 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)).
+// You will need to have Rust installed, of course. It is available for download on
+// [the Rust website](https://www.rust-lang.org/). Make sure you get at least version 1.3.
+// More detailed installation instructions are provided in
+// [The Book](https://doc.rust-lang.org/stable/book/).
+// This will also install `cargo`, the tool responsible for building rust projects (or *crates*).

 // 
 // 

+// Next, we have to prepare a workspace for you to conduct your Rust-101 work in, so that you don't
+// have to start with an empty file. The easiest way is to
+// [download the workspace](https://www.ralfj.de/projects/rust-101/workspace.zip)
+// matching the online tutorial. Try `cargo build` in that new folder to check that compiling your
+// workspace succeeds.
+// (You can also execute it with `cargo run`, but you'll need to do some work before this does
+// anything useful.)
+//
+// Alternatively, you can build the workspace from source by fetching the
+// [git repository](https://www.ralfj.de/git/rust-101.git) and running `make workspace`.
+

 // Course Content
 // --------------
 // 
 // 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:
+// Open `your-workspace/src/part00.rs` in your favorite editor, and follow the link below for
+// the explanations and exercises. You are ready to start. Have fun!
+// 
+// ### Introduction
+//
+// * [Part 00: Algebraic datatypes](part00.html)
+// * [Part 01: Expressions, Inherent methods](part01.html)
+// * [Part 02: Generic types, Traits](part02.html)
+// * [Part 03: Input](part03.html)
+// 
+// ### Basic Rust

 // 
 // 

-// * [Part 00](part00.html)
-// * [Part 01](part01.html)
-// * [Part 02](part02.html)
-// * [Part 03](part03.html)
-// * (to be continued)
-#![allow(dead_code, unused_imports, unused_variables)]
+// * [Part 04: Ownership, Borrowing, References](part04.html)
+// * [Part 05: Clone](part05.html)
+// * [Part 06: Copy, Lifetimes](part06.html)
+// * [Part 07: Operator Overloading, Tests, Formating](part07.html)
+// * [Part 08: Associated Types, Modules](part08.html)
+// * [Part 09: Iterators](part09.html)
+// * [Part 10: Closures](part10.html)
+// 
+// ### Advanced Rust
+// 
+// * [Part 11: Trait Objects, Box, Lifetime bounds](part11.html)
+// * [Part 12: Rc, Interior Mutability, Cell, RefCell](part12.html)
+// * [Part 13: Concurrency, Arc, Send](part13.html)
+// * [Part 14: Slices, Arrays, External Dependencies](part14.html)
+// * [Part 15: Mutex, Interior Mutability (cont.), RwLock, Sync](part15.html)
+// * [Part 16: Unsafe Rust, Drop](part16.html)
+// 
+#![allow(dead_code, unused_imports, unused_variables, unused_mut, unreachable_code)]

 mod part00;
 mod part01;
 mod part02;
 mod part03;
 mod part00;
 mod part01;
 mod part02;
 mod part03;

+mod part04;
+mod part05;
+mod part06;
+mod part07;
+mod part08;
+mod part09;
+mod part10;
+mod part11;
+mod part12;
+mod part13;
+mod part14;
+mod part15;
+mod part16;

 
 

-// To actually run the code of some part (after filling in the blanks, if necessary), simply edit the `main`
-// function.
-
+// To actually run the code of some part (after filling in the blanks, if necessary), simply edit
+// the `main` function.

 fn main() {
     part00::main();
 }
 
 fn main() {
     part00::main();
 }
 

+

 // Additional material
 // -------------------
 // 
 // Additional material
 // -------------------
 // 


@@ -67,6 +118,10 @@ fn main() {
 // of the most interesting places here:
 // 
 // * [The Rust Book](https://doc.rust-lang.org/stable/book/)
 // of the most interesting places here:
 // 
 // * [The Rust Book](https://doc.rust-lang.org/stable/book/)

+// * [The Rustonomicon](https://doc.rust-lang.org/nightly/nomicon/)

 // * [Rust by Example](http://rustbyexample.com/)
 // * The [Rust Subreddit](https://www.reddit.com/r/rust/)
 // * [Rust by Example](http://rustbyexample.com/)
 // * The [Rust Subreddit](https://www.reddit.com/r/rust/)

-// * For the IRC channel and other forums, see the "Community" section of the [Rust Documentation index](http://doc.rust-lang.org/index.html)
+// * A [collection of links](https://github.com/ctjhoa/rust-learning) to blog posts, articles,
+//   videos, etc. for learning Rust.
+// * For the IRC channel and other forums, see the "Community" section of the
+//   [Rust Documentation index](https://doc.rust-lang.org/index.html)