Beginning Rust: From Novice to Professional

© Carlo Milanesi 2018

Carlo MilanesiBeginning Rusthttps://doi.org/10.1007/978-1-4842-3468-6_7

7. Enumerating Cases

Carlo Milanesi¹ 

(1)

Bergamo, Italy

 

In this chapter, you will learn:

• How enums help in defining variables that can take on values only from a finite set of cases

• How enums can be used to implement discriminated union types

• How to use the match pattern-matching construct to handle enums

• How to use the match construct to handle other data types, like integer numbers, strings, and single characters

• How to use Boolean guards to generalize the pattern-matching of the match construct

Enumerations

Instead of writing the following code:

const EUROPE: u8 = 0;

const ASIA: u8 = 1;

const AFRICA: u8 = 2;

const AMERICA: u8 = 3;

const OCEANIA: u8 = 4;