Book Image

Rust Standard Library Cookbook

By : Jan Hohenheim, Daniel Durante
Book Image

Rust Standard Library Cookbook

By: Jan Hohenheim, Daniel Durante

Overview of this book

Mozilla’s Rust is gaining much attention with amazing features and a powerful library. This book will take you through varied recipes to teach you how to leverage the Standard library to implement efficient solutions. The book begins with a brief look at the basic modules of the Standard library and collections. From here, the recipes will cover packages that support file/directory handling and interaction through parsing. You will learn about packages related to advanced data structures, error handling, and networking. You will also learn to work with futures and experimental nightly features. The book also covers the most relevant external crates in Rust. By the end of the book, you will be proficient at using the Rust Standard library.
Table of Contents (12 chapters)

How it works...

This recipe is incredibly important. No matter what you do, or which library you use, it's going to use iterators somewhere. All of the operations presented can be used on any collection and all types that implement the iterator trait.

In the first section, we looked at different ways to create iterators. I mention that ranges are limited because, in order to be iterable, the range-type has to implement Step. char doesn't, so you wouldn't be able to use 'A'..'D' as an iterator. For this reason, in line [209], we iterate over the characters as bytes:

    let alphabet: Vec<_> = (b'A' .. b'z' + 1) // Start as u8
.map(|c| c as char) // Convert all to chars
.filter(|c| c.is_alphabetic()) // Filter only alphabetic chars
.collect(); // Collect as Vec<char>

We have to set the limit of the range to b'z' + 1, because ranges are non-inclusive. You might have noticed that...