Book Image

The Complete Rust Programming Reference Guide

By : Rahul Sharma, Vesa Kaihlavirta, Claus Matzinger
Book Image

The Complete Rust Programming Reference Guide

By: Rahul Sharma, Vesa Kaihlavirta, Claus Matzinger

Overview of this book

Rust is a powerful language with a rare combination of safety, speed, and zero-cost abstractions. This Learning Path is filled with clear and simple explanations of its features along with real-world examples, demonstrating how you can build robust, scalable, and reliable programs. You’ll get started with an introduction to Rust data structures, algorithms, and essential language constructs. Next, you will understand how to store data using linked lists, arrays, stacks, and queues. You’ll also learn to implement sorting and searching algorithms, such as Brute Force algorithms, Greedy algorithms, Dynamic Programming, and Backtracking. As you progress, you’ll pick up on using Rust for systems programming, network programming, and the web. You’ll then move on to discover a variety of techniques, right from writing memory-safe code, to building idiomatic Rust libraries, and even advanced macros. By the end of this Learning Path, you’ll be able to implement Rust for enterprise projects, writing better tests and documentation, designing for performance, and creating idiomatic Rust code. This Learning Path includes content from the following Packt products: • Mastering Rust - Second Edition by Rahul Sharma and Vesa Kaihlavirta • Hands-On Data Structures and Algorithms with Rust by Claus Matzinger
Table of Contents (29 chapters)
Title Page
Copyright
About Packt
Contributors
Preface
Index

Combinators on Option/Result


As Option and Result are wrapper types, the only way to safely interact with their inner values is either through pattern matching or if let. This paradigm of using matching and then acting on the inner values is a very common operation and, as such, it becomes very tedious having to write them every time. Fortunately, these wrapper types come with lots of helper methods, also known as combinators, implemented on them that allow you to manipulate the inner values easily.

These are generic methods and there are many kinds depending on the use case. Some methods act on success values, such as Ok(T)/Some(T), while some of them act on failed values, such as Err(E)/None. Some methods unwrap and extract the inner value, while some preserve the structure of the wrapper type modifying just the inner values.

Note

Note: In this section, when we talk about success values, we are commonly referring to Ok(T)/Some(T) variants and when we talk about failed values, we are referring...