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...

walkdir consists of three important types:

  • WalkDir: A builder (see the Using the builder pattern section in Chapter 1Learning the Basics) for your directory walker
  • IntoIter: The iterator created by the builder
  • DirEntry: Represents a single folder or file

If you just want to operate on a list of all entries under a root folder, such as in the first example in line [6], you can implicitly use WalkDir directly as an iterator over different instances of DirEntry:

for entry in WalkDir::new(".") {
if let Ok(entry) = entry {
println!("{}", entry.path().display());

As you can see, the iterator doesn't directly give you a DirEntry, but a Result. This is because there are some cases where accessing a file or folder might prove difficult. For instance, the OS could prohibit you from reading the contents of a folder, hiding the files in it. Or a symlink, which you could enable by calling follow_links(true) on the WalkDir...