> For the complete documentation index, see [llms.txt](https://rafli-ramadhan.gitbook.io/golang-example-code-by-topic/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://rafli-ramadhan.gitbook.io/golang-example-code-by-topic/interface-kosong-atau-any.md).

# Interface Kosong atau Any

Interface kosong dapat di inisiasi menggunakan `any` untuk Go version di atas 1.18. Untuk memperoleh nilai dari interface kosong dapat menggunakan *type assertion* seperti contoh *code* berikut.

## Contoh code interface kosong untuk menampung string, integer dan slice

```go
package main

import (
	"fmt"
)

func main() {
    var name any = "member_01"
    // type assertion
    stringName := name.(string)
    fmt.Println(stringName)

    var number1 any = 2
    var number2 any = 3
    // type assertion
    hasil := number1.(int64) + number2.(int64)
    fmt.Println(hasil)

    var user any = []string{"member_01", "member_02", "member_03"}
    // type assertion
    arrayUser := user.([]string)
    for _, v := range arrayUser {
        fmt.Println(v)
    }
}
```

```
member_01
5
member_01
member_02
member_03
```

## Contoh code interface kosong untuk menampung output function

```go
package main
import "fmt"

func main() {
	var test any = func(a, b int) int {
		return a+b
	} 
	// type assertion
	someFunc, ok := test.(func(a, b int) int)
	fmt.Println(ok)
	fmt.Println(someFunc(2,3))
}
```

```
true
5
```

## Contoh code interface kosong untuk menampung value dari channel

```go
package main

import (
	"fmt"
	"time"
)

func main() {
	ch := make(chan int)
	go func() {
		var result interface{} =<- ch
		fmt.Println(result)
	}()
	ch<-1
	time.Sleep(1 * time.Second)
}
```

```
1
```

## Contoh code type assertion interface kosong jika berisi nil

Jika interface kosong bernilai nil, maka tidak bisa dilakukan type assertion untuk memperoleh nilai sesuai tipe data dalam interface kosong.

```go
package main

import (
	"fmt"
)

func main() {
	var errors any = fmt.Errorf("some error")
	res := errors.(error)
	fmt.Println(res)

	// this code will give an panic
	var errors2 any = nil
	res2 := errors2.(error)
	fmt.Println(res2)
}
```

```
panic: interface conversion: interface is nil, not error

goroutine 1 [running]:
main.main()
	/tmp/sandbox3945396184/prog.go:13 +0x99
Program exited.
```


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://rafli-ramadhan.gitbook.io/golang-example-code-by-topic/interface-kosong-atau-any.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.