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Rust Essentials

You're reading from   Rust Essentials A quick guide to writing fast, safe, and concurrent systems and applications

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Product type Paperback
Published in Nov 2017
Publisher
ISBN-13 9781788390019
Length 264 pages
Edition 2nd Edition
Languages
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Author (1):
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Ivo Balbaert Ivo Balbaert
Author Profile Icon Ivo Balbaert
Ivo Balbaert
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Table of Contents (13) Chapters Close

Preface 1. Starting with Rust FREE CHAPTER 2. Using Variables and Types 3. Using Functions and Control Structures 4. Structuring Data and Matching Patterns 5. Higher Order Functions and Error-Handling 6. Using Traits and OOP in Rust 7. Ensuring Memory Safety and Pointers 8. Organizing Code and Macros 9. Concurrency - Coding for Multicore Execution 10. Programming at the Boundaries 11. Exploring the Standard Library 12. The Ecosystem of Crates

Arrays, vectors, and slices

Suppose we have a bunch of alien creatures to populate a game level, then we probably want to store their names in a handy list. Rust's array is just what we need:

// from Chapter 4/code/arrays.rs 
let aliens = ["Cherfer", "Fynock", "Shirack", "Zuxu"]; 
println!("{:?}", aliens); 

To make an array, separate the different items by commas and surround the whole with [ ] (rectangular brackets). All items must be of the same type. Such an array is of fixed size (it must be known at compile time) and cannot be changed; it is stored in one contiguous piece of memory in stack memory.

If the items have to be modifiable, declare your array with let mut; however even then the number of items cannot change:

let mut aliens = ["Cherfer", "Fynock", "Shirack", "Zuxu"]; 

The...

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