Go defer keyword

 The defer keyword is generally used for cleaning purpose. The defer keyword postpones the execution of a function or statement until the end of the calling function.

It executes code (a function or expression) when the enclosing function returns before the closing curly brace }. It is also executed if an error occurs during the execution of the enclosing function.

Go defer Example

1. package main  
2. import (  
3.    "fmt"  
4. )  
5. func main() {  
6.    defer print1("Hi...")  
7.    print2("there")  
8. }  
9. func  print1(s string)  {  
10.    fmt.Println(s)  
11. }  
12. func print2(s string)  {  
13.    fmt.Println(s)  
14. }  

Output:

there
Hi...