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...

First of all, we prepare our file[9] and its OpenOptions so that we have both read and write access on the file. You will remember this from Chapter 3, Handling Files and the Filesystem; Working with text files

Then we write the CSV. We do this by wrapping any kind of Write in a csv::Writer[30]. You can then use write_record on it to write any data type that can be represented as an iterator over &[u8]. Most of the time, this will simply be an array of strings.

While reading, we similarly wrap a Read in a csv::Read. The records() method returns an iterator over Result of StringRecord. This way, you get to decide how to handle a malformed record. In our example, we simply skip it. Lastly, we call get() on a record to get a certain field. If there was no entry at the specified index or if it was out of bounds, this would return None.