87 lines
2.8 KiB
Markdown
87 lines
2.8 KiB
Markdown
# Rust By Practice
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This book was designed for easily diving into Rust, and it's very easy to use: All you need to do is to make each exercise compile without ERRORS and Panics !
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> π Updated on 2022-03-07: Add [Vectors](https://practice.rs/collections/vector.html)
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## Read online
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- [https://practice.rs](https://practice.rs)
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## Features
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Part of our examples and exercises are borrowed from [Rust By Example](https://github.com/rust-lang/rust-by-example), thanks for your great works!
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Although they are so awesome, we have our own secret weapons :)
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- There are three parts in each chapter: examples, exercises and practices
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- Besides examples, we have `a lot of exercises`, you can Read, Edit and Run them ONLINE
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- Covering nearly all aspects of Rust, such as async/await, threads, sync primitives, optimizing and standard libraries etc.
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- Every exercise has its own solutions
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- The overall difficulties are a bit higher and from easy to super hard: easy π medium ππ hard πππ super hard ππππ
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**What we want to do is fill in the gap between learning and getting started with real projects.**
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## Some of our exercises
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πππ Tuple struct looks similar to tuples, it has added meaning the struct name provides but has no named fields. It's useful when you want give the whole tuple a name, but don't care the fields's names.
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```rust
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// fix the error and fill the blanks
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struct Color(i32, i32, i32);
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struct Point(i32, i32, i32);
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fn main() {
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let v = Point(___, ___, ___);
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check_color(v);
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}
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fn check_color(p: Color) {
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let (x, _, _) = p;
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assert_eq!(x, 0);
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assert_eq!(p.1, 127);
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assert_eq!(___, 255);
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}
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```
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ππ Within the destructuring of a single variable, both by-move and by-reference pattern bindings can be used at the same time. Doing this will result in a partial move of the variable, which means that parts of the variable will be moved while other parts stay. In such a case, the parent variable cannot be used afterwards as a whole, however the parts that are only referenced (and not moved) can still be used.
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```rust
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// fix errors to make it work
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#[derive(Debug)]
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struct File {
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name: String,
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data: String,
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}
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fn main() {
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let f = File {
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name: String::from("readme.md"),
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data: "Rust By Practice".to_string()
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};
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let _name = f.name;
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// ONLY modify this line
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println!("{}, {}, {:?}",f.name, f.data, f);
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}
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```
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ππ A match guard is an additional if condition specified after the pattern in a match arm that must also match, along with the pattern matching, for that arm to be chosen.
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```rust,editable
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// fill in the blank to make the code work, `split` MUST be used
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fn main() {
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let num = Some(4);
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let split = 5;
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match num {
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Some(x) __ => assert!(x < split),
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Some(x) => assert!(x >= split),
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None => (),
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}
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}
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```
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