Beginning Rust: Get Started with Rust 2021 Edition

© The Author(s), under exclusive license to APress Media, LLC, part of Springer Nature 2022

C. MilanesiBeginning Rusthttps://doi.org/10.1007/978-1-4842-7208-4_9

9. Defining Functions

Carlo Milanesi¹  

(1)

Bergamo, Italy

 

In this chapter you will learn:

• How to define your own procedures (better known as “functions”) and how to invoke them

• When and how you can have several functions with the same name

• How to pass arguments to a function, by value or by reference

• How to return simple and composite values from a function

• How to exit prematurely from a function

• How references to objects can be manipulated

Defining and Invoking a Function

If it happens that you write the same code several times, you can encapsulate that code in a block, and then give that block ...