Structs

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Examples in Go
Struct Methods in Go
by yhuang Go fmt.Println fmt 
package main

import "fmt"

type rect struct {
    width, height int
}

func (r *rect) area() int {
    return r.width * r.height
}

func (r rect) perim() int {
    return 2*r.width + 2*r.height
}

func main() {
    r := rect{width: 10, height: 5}

    fmt.Println("area: ", r.area())
    fmt.Println("perim:", r.perim())

    rp := &r
    fmt.Println("area: ", rp.area())
    fmt.Println("perim:", rp.perim())
}
Structs in Go
by yhuang Go fmt.Println fmt
Go’s structs are typed collections of fields. They’re useful for grouping data together to form records.
package main

import "fmt"

// Define a struct.
type person struct {
    name string
    age  int
}

// This function initializes a struct variable and returns a pointer to it.
func NewPerson(name string) *person {
    p := person{name: name}
    p.age = 42
    return &p
}

func main() {
    // Without keys, you can initialize the members in order that they were defined.
    fmt.Println(person{"Bob", 20})
    
    // With keys.
    fmt.Println(person{name: "Alice", age: 30})

    // Omitted members will be initialized with their "zero value".
    fmt.Println(person{name: "Fred"})

    // Returning a pointer to an initialized struct.
    fmt.Println(&person{name: "Ann", age: 40})

    // Calling a function to create our struct.
    fmt.Println(NewPerson("Jon"))

    // Using the dot operator to access the member values. Works with values and pointers.
    s := person{name: "Sean", age: 50}
    fmt.Println(s.name)

    sp := &s
    fmt.Println(sp.age)

    sp.age = 51
    fmt.Println(sp.age)
}