Beginning Rust: From Novice to Professional

© Carlo Milanesi 2018

Carlo MilanesiBeginning Rusthttps://doi.org/10.1007/978-1-4842-3468-6_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 a name. In this way you define a “function”. Then you can execute ...