what is go func()

In Go language, `func()` is a keyword used to define a function. It is used to declare a function literal, also known as an anonymous function. An anonymous function is a function without a name that can be defined inline with other code.

The `go` keyword is used to start a new goroutine, which is a lightweight thread of execution. When a goroutine is started with `go func()`, the function is executed concurrently with the calling function. The `func()` is a function literal that defines the code to be executed in the new goroutine.

Here's an example of using `go func()` to start a new goroutine:

func main() {
    go func() {
        fmt.Println("Hello from a goroutine!")
    }()
    fmt.Println("Hello from main!")
}

In this example, the `go func()` starts a new goroutine that prints "Hello from a goroutine!" while the main function prints "Hello from main!". The output may vary on each execution, as the two goroutines run concurrently.