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Go Defer function

Defer is used to ensure that a function call is performed later in a program’s execution, usually for purposes of cleanup. defer is often used where e.g. ensure and finally would be used in other languages.

Syntax of Defer function in Go


// Function
defer func func_name(parameter_list Type) return_type {
// Code to be executed later
}

Example of Defer function in Go

package main
 
import "fmt"
 
func multiply(a1, a2 int) int {
    res := a1 * a2
    fmt.Println("Result: ", res)
    return 0
}
 
func say_hello_world() {
    fmt.Println("Hello World!")
}
 
func main() {
 
    multiply(23, 45)
 
    defer multiply(23, 56)
 
    say_hello_world()
}

Output

Result: 1035
Hello World!
Result: 1288

Conclusion

In this page (written and validated by ) you learned about Go Defer function . What's Next? If you are interested in completing Go tutorial, your next topic will be learning about: Go File Exist check.



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