How can I implement design patterns in Go?

How can I implement design patterns in Go?

You can implement design patterns in Go by using interfaces and struct types to create reusable components. Which pattern are you interested in?

I'm particularly interested in the Singleton pattern.

To implement the Singleton pattern in Go, you can use a package-level variable and a sync.Once to ensure it's only initialized once. Would you like a code example?

Yes, please provide a code example.

Here's a simple implementation:

package main

import (
    "fmt"
    "sync"
)

type singleton struct {}

var instance *singleton
var once sync.Once

func GetInstance() *singleton {
    once.Do(func() {
        instance = &singleton{}
    })
    return instance
}

func main() {
    s1 := GetInstance()
    s2 := GetInstance()
    fmt.Println(s1 == s2) // true
}