Chapter 9. The Optional Type

Sometimes a value may or may not exist.

6 items

Section	Title
1	The Optional Type
2	Null
3	Unwrapping Optionals
4	Optional Pointers
5	Optionals Versus Errors
6	Exercises

Writes › Book › Learn › Learn Zig › Chapter 9. The Optional Type ›

The Optional Type

Sometimes a value may or may not exist.

Writes › Book › Learn › Learn Zig › Chapter 9. The Optional Type ›

Null

null is the value used when an optional has no payload.

Writes › Book › Learn › Learn Zig › Chapter 9. The Optional Type ›

Unwrapping Optionals

An optional value cannot be used as the payload type until it is unwrapped.

Writes › Book › Learn › Learn Zig › Chapter 9. The Optional Type ›

Optional Pointers

Pointers are often optional.

Writes › Book › Learn › Learn Zig › Chapter 9. The Optional Type ›

Optionals Versus Errors

Optionals and errors both describe a value that may not be produced.

Writes › Book › Learn › Learn Zig › Chapter 9. The Optional Type ›

Exercises

Exercise 9-17. Declare an optional integer.