Go 语言中的匿名函数
原文:https://www . geesforgeks . org/anonymous-function in-go-language/
Go 语言提供了一个被称为匿名函数的特殊功能。匿名函数是不包含任何名称的函数。当您想要创建内联函数时，它非常有用。在 Go 语言中，匿名函数可以形成闭包。一个匿名函数也被称为 函数字面意思 。
语法:
func(parameter_list)(return_type){
// code..
// Use return statement if return_type are given
// if return_type is not given, then do not
// use return statement
return
}()
例:
// Go program to illustrate how
// to create an anonymous function
package main
import "fmt"
func main() {
// Anonymous function
func(){
fmt.Println("Welcome! to GeeksforGeeks")
}()
}
输出:
Welcome! to GeeksforGeeks
要点:
-
In Go language, you are allowed to assign an anonymous function to a variable. When you assign a function to a variable, then the type of the variable is of function type and you can call that variable like a function call as shown in the below example.
例:
```go // Go program to illustrate // use of an anonymous function package main
import "fmt"
func main() {
// Assigning an anonymous // function to a variable value := func(){ fmt.Println("Welcome! to GeeksforGeeks") } value()
} ```
输出:
go Welcome! to GeeksforGeeks -
也可以在匿名函数中传递参数。
示例:
```go // Go program to pass arguments // in the anonymous function package main
import "fmt"
func main() {
// Passing arguments in anonymous function func(ele string){ fmt.Println(ele) }("GeeksforGeeks")
} ```
输出:
go GeeksforGeeks -
您也可以将一个匿名函数作为参数传递给其他函数。
示例:
```go // Go program to pass an anonymous // function as an argument into // other function package main
import "fmt"
// Passing anonymous function // as an argument func GFG(i func(p, q string)string){ fmt.Println(i ("Geeks", "for"))
}
func main() { value:= func(p, q string) string{ return p + q + "Geeks" } GFG(value) } ```
输出:
go GeeksforGeeks -
您也可以从另一个函数返回一个匿名函数。
例:
```go // Go program to illustrate // use of anonymous function package main
import "fmt"
// Returning anonymous function func GFG() func(i, j string) string{ myf := func(i, j string)string{ return i + j + "GeeksforGeeks" } return myf }
func main() { value := GFG() fmt.Println(value("Welcome ", "to ")) } ```
输出:
go Welcome to GeeksforGeeks
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