> For the complete documentation index, see [llms.txt](https://openai.gitbook.io/code-cheatsheets/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://openai.gitbook.io/code-cheatsheets/all/go/structs.md).

# structs

No inheritance

```go
type Dog struct {
    Breed string 
    Weight int
}

type Cat struct {
}
```

### Creation

```go
poodle := Dog{"Poodle", 34}
poodle := Dog{Breed: "Poodle", Weight: 34}
jaguar := Cat{}
```

### Printing

```go
fmt.Println(poodle) //outputs "Poodle 34" 
fmt.Printf("%+v", poodle) //outputs {Breed:Poodle Weight:34}
```

## Methods

After declaring a type as above

```go
type Dog struct {
    Sound string 
}

//recieves Dog;; pass by val
func (d Dog) Speak() {
    fmt.Println(d.Sound)
}

//pass d by ref
func (d *Dog) doubleDog() {
    d.Sound = fmt.Sprintf("%v! %v!\n", d.Sound, d.Sound) 
    fmt.Print(d.Sound)
}
```