Monday, May 1, 2017
Defer in Golang
Defer in Golang
defer statement helps to execute program statement or anonymous function at end of the function execution.
Example Program:
package main
import "fmt"
func main() {
fmt.Println("Start Main")
testfunction()
fmt.Println("End Main")
}
func testfunction() {
/* This defer statement executed end of the function */
defer fmt.Println("test function finished and exit")
/* Do the work of funtion */
var a, b int = 10, 20
var c int = a + b
fmt.Println("Value of Addition", c)
}
Output:
Start Main
Value of Addition 30
test function finished and exit
End Main
One of the use case for defer statement is open a file for writing, next inside the defer mention file close then go for write. once function execution done defer will close the file automatically.
Example Program:
package main
import "fmt"
func main() {
fmt.Println("Start Main")
testfunction()
fmt.Println("End Main")
}
func testfunction() {
/* This defer statement executed end of the function */
defer fmt.Println("test function finished and exit")
/* Do the work of funtion */
var a, b int = 10, 20
var c int = a + b
fmt.Println("Value of Addition", c)
}
Output:
Start Main
Value of Addition 30
test function finished and exit
End Main
One of the use case for defer statement is open a file for writing, next inside the defer mention file close then go for write. once function execution done defer will close the file automatically.
download more info
Subscribe to:
Post Comments (Atom)
No comments:
Post a Comment