Part 9. Optionals and Advanced Types

An optional type is a type that can hold either a value or no value.

9 items

Section	Title
1	Optional Types
2	Optional Unwrapping
3	Nullable Pointers
4	Vectors
5	Opaque Types
6	`anytype`
7	Error Union Internals
8	Type Coercion
9	Type Reflection Basics

Writes › Book › Zig › Part 9. Optionals and Advanced Types ›

Optional Types

An optional type is a type that can hold either a value or no value.

Writes › Book › Zig › Part 9. Optionals and Advanced Types ›

Optional Unwrapping

Optional unwrapping means taking the value out of an optional.

Writes › Book › Zig › Part 9. Optionals and Advanced Types ›

Nullable Pointers

A pointer stores the address of a value in memory.

Writes › Book › Zig › Part 9. Optionals and Advanced Types ›

Vectors

A vector is a fixed-size group of values of the same type.

Writes › Book › Zig › Part 9. Optionals and Advanced Types ›

Opaque Types

An opaque type is a type whose internal structure is hidden.

Writes › Book › Zig › Part 9. Optionals and Advanced Types ›

`anytype`

anytype means the function parameter can accept many different types.

Writes › Book › Zig › Part 9. Optionals and Advanced Types ›

Error Union Internals

An error union is a value that can contain either:

Writes › Book › Zig › Part 9. Optionals and Advanced Types ›

Type Coercion

Type coercion means Zig converts a value from one type to another when the conversion is safe and well-defined.

Writes › Book › Zig › Part 9. Optionals and Advanced Types ›

Type Reflection Basics

Type reflection means asking questions about a type while Zig is compiling the program.