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Book Overview & Buying
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Table Of Contents
The Rust Programming Handbook
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In this chapter, we’ve taken a deep dive into functions, the fundamental building blocks for organizing logic and behavior in any Rust program. We started with the basics of defining functions using the fn keyword, specifying typed parameters, and understanding how Rust’s expression-based nature allows for concise return values without an explicit return keyword. By mastering these essentials, you’ve learned how to break down complex problems into smaller, reusable, and more manageable pieces, which is a cornerstone of writing clean and maintainable code.
A central theme of this chapter was the critical interaction between functions and Rust’s ownership system. We explored the important distinction between passing simple types that are copied (such as i32) and passing owned types (such as String), which results in a move, transferring ownership into the function. We also saw how to use references (&T and &mut T) to allow functions to...