Anonymous Functions in Go
In this tutorial, we are going to discuss anonymous functions in the Go language. Go language provides a special feature known as an anonymous function.
An anonymous function is a function that doesn’t contain any name. It is useful when you want to create an inline function.
In the Go language, an anonymous function can form a closure. An anonymous function is also known as function literal.
Declaring Anonymous Functions
Declaration syntax for anonymous function is pretty straightforward. It is no different in syntax than a regular function.
Syntax
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
}()package main
import "fmt"
func main() {
func() {
fmt.Println("Welcome to Waytoeasylearn..!!")
}()
}Welcome to Waytoeasylearn..!!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.
package main
import "fmt"
func main() {
value := func() {
fmt.Println("Welcome to Waytoeasylearn..!!")
}
value()
}Please note that you can also pass arguments in the anonymous function.
package main
import "fmt"
func main() {
func(message string) {
fmt.Println(message)
}("Welcome to Waytoeasylearn..!!")
}You can also pass an anonymous function as an argument into other function.
package main
import "fmt"
func print(i func(p, q string)string){
fmt.Println(i ("Welcome ", "to "))
}
func main() {
value:= func(p, q string) string{
return p + q + "Waytoeasylearn..!!"
}
print(value)
} You can also return an anonymous function from another function.
package main
import "fmt"
func display() func(i, j string) string{
myf := func(i, j string)string{
return i + j + "Waytoeasylearn..!!"
}
return myf
}
func main() {
value := display()
fmt.Println(value("Welcome ", "to "))
} Please note that anonymous functions can accept inputs and return outputs, just as standard functions do.
That’s all about the Anonymous Functions in Go language. If you have any queries or feedback, please write us email at contact@waytoeasylearn.com. Enjoy learning, Enjoy Go language.!!