Structs

Structs are the primary way to define custom data types in Run.

package main

use "fmt"

pub type Point struct {
    x: f64
    y: f64
}

pub fun main() {
    p := Point{ x: 3.0, y: 4.0 }
    fmt.println(p.x)
    fmt.println(p.y)
}

Field access

Struct fields are accessed using dot notation.

p := Point{ x: 1.0, y: 2.0 }
p.x = 5.0
fmt.println(p.x) // 5.0

Visibility

Structs can be made public with pub. Field visibility follows the same rules — fields are private by default within the struct’s package.

pub type Config struct {
    pub host: string
    pub port: int
    secret: string  // private to this package
}

Methods are declared separately from structs and are covered in a later chapter.