Singleton in go

Question

How does one implement the Singleton design pattern in the go programming language?

Answer 1

The best approach will be:

 package singleton

 import "sync"

 type singleton struct {
 }

 var instance *singleton
 var once sync.Once

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

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