Part 4. Functions

Functions are reusable blocks of code.

11 items

Section	Title
1	The Structure of a Function
2	Parameter Syntax
3	The `return` Keyword
4	Returning a Struct
5	A First Example
6	A First Example
7	What Anonymous Functions Usually Mean
8	A Simple Function
9	A Mental Model
10	What “Exported” Means
11	Zig Generics Use `comptime`

Writes › Book › Zig › Part 4. Functions ›

The Structure of a Function

Functions are reusable blocks of code.

Writes › Book › Zig › Part 4. Functions ›

Parameter Syntax

Function parameters are the inputs of a function.

Writes › Book › Zig › Part 4. Functions ›

The `return` Keyword

Functions often need to produce results.

Writes › Book › Zig › Part 4. Functions ›

Returning a Struct

Many functions need to produce more than one piece of information.

Writes › Book › Zig › Part 4. Functions ›

A First Example

Recursion is a technique where a function calls itself.

Writes › Book › Zig › Part 4. Functions ›

A First Example

Functions are values.

Writes › Book › Zig › Part 4. Functions ›

What Anonymous Functions Usually Mean

An anonymous function is a function without a permanent name.

Writes › Book › Zig › Part 4. Functions ›

A Simple Function

An inline function is a function where the compiler may place the function’s code directly at the call site instead of performing a normal function call.

Writes › Book › Zig › Part 4. Functions ›

A Mental Model

A calling convention defines how functions communicate at the machine level.

Writes › Book › Zig › Part 4. Functions ›

What “Exported” Means

An exported function is a function made visible outside the current Zig program.

Writes › Book › Zig › Part 4. Functions ›

Zig Generics Use `comptime`

A generic function is a function that works with many types instead of only one type.