Anonymous functions and Closures

Directly invoking the anonymous function:

 func main() {
     func(msg string) {
         fmt.Println(msg)
     }("Hello, World!")
 }

Using an assigned variable that holds the function:

 func main() {
     var myFunc = func(msg string) {
         fmt.Println(msg)
     }
     myFunc("Hello, World!")
 }

Utilizing the argument name from a higher-order function that takes this anonymous function as a parameter:

func higherOrderFunction(fn func(string)) {
     fn("Hello from higher order function!")
 }
 
 func main() {
     var myFunc = func(msg string) {
         fmt.Println(msg)
     }
     higherOrderFunction(myFunc)
 }

Calling it through a unique identifier of the function:

 func main() {
     func myFunction() {
         fmt.Println("Hello, World!")
     }
     myFunction()
 }