2.1. The variable parameter function
- Refers to the number of variable parameters may be any parameter a
- The variable parameters must be in the final position of the parameter list, add three dots indicate variable parameter function between the parameter name and type
- When you declare a function in the body of the function as the variable parameters can use slices
package main
import "fmt"
func demo(name string, hover ... string) {
fmt.Println (name, "hobby")
for i,n := range hover{
fmt.Println(i,n)
}
}
func main() {
demo ( "derek", "read", "play", "Game")
}
//result
derek hobby
0 reading
1 play
2 game
2.2 anonymous function
package main
import "fmt"
func main() {
// first: None Parameters None Return Values
func(){
fmt.Println ( "no parameter None Return Value anonymous function")
}()
// second: there are parameters
func(name string){
fmt.Println ( "named:", name)
}("derek")
// Third: to return to duty
name := func() string{
return "zhang_derek"
}()
fmt.Println(name)
}
2.3. Function variables
In the go language function is a type
- After-defined function variables, you can use an anonymous function assignment, you can use already defined function assignment
- After defining function variables and the same general function call syntax, variable name is the function name of an ordinary function declaration
- Function variables are referenced in addition to the fifth slice, map, channel, interface type
(1) function is a reference type variable
package main
import "fmt"
func b() {
fmt.Println("bbb")
}
func main() {
// function is a reference type variable
var func ()
a = b
// same memory address
fmt.Println(a,b) //0x47d820 0x47d820
}
(2) function as a parameter
package main
import "fmt"
func mydo(arg func(name string)) {
fmt.Println ( "execution mydo")
arg("derek")
}
func main() {
mydo(func(name string) {
fmt.Println(name)
})
}
(3) function as a return value
package main
import "fmt"
// function as a return value
func a() func() int{
return func() int {
return 110
}
}
func main() {
result := a()
r2 := result()
fmt.Println(r2) //110
}
Source Address: https://www.cnblogs.com/derek1184405959/
2.1. The variable parameter function
- Refers to the number of variable parameters may be any parameter a
- The variable parameters must be in the final position of the parameter list, add three dots indicate variable parameter function between the parameter name and type
- When you declare a function in the body of the function as the variable parameters can use slices
package main
import "fmt"
func demo(name string, hover ... string) {
fmt.Println (name, "hobby")
for i,n := range hover{
fmt.Println(i,n)
}
}
func main() {
demo ( "derek", "read", "play", "Game")
}
//result
derek hobby
0 reading
1 play
2 game
2.2 anonymous function
package main
import "fmt"
func main() {
// first: None Parameters None Return Values
func(){
fmt.Println ( "no parameter None Return Value anonymous function")
}()
// second: there are parameters
func(name string){
fmt.Println ( "named:", name)
}("derek")
// Third: to return to duty
name := func() string{
return "zhang_derek"
}()
fmt.Println(name)
}
2.3. Function variables
In the go language function is a type
- After-defined function variables, you can use an anonymous function assignment, you can use already defined function assignment
- After defining function variables and the same general function call syntax, variable name is the function name of an ordinary function declaration
- Function variables are referenced in addition to the fifth slice, map, channel, interface type
(1) function is a reference type variable
package main
import "fmt"
func b() {
fmt.Println("bbb")
}
func main() {
// function is a reference type variable
var func ()
a = b
// same memory address
fmt.Println(a,b) //0x47d820 0x47d820
}
(2) function as a parameter
package main
import "fmt"
func mydo(arg func(name string)) {
fmt.Println ( "execution mydo")
arg("derek")
}
func main() {
mydo(func(name string) {
fmt.Println(name)
})
}
(3) function as a return value
package main
import "fmt"
// function as a return value
func a() func() int{
return func() int {
return 110
}
}
func main() {
result := a()
r2 := result()
fmt.Println(r2) //110
}