Function Declare in Go

In Go, a function or method can be declared using the following syntax:

func function_name(arguments) return_type {
   // function body
}

Here's an example function that calculates the sum of two integers:

func sum(x int, y int) int {
   return x + y
}

In this example, sum is the function name, (x int, y int) are the arguments, and int is the return type. The function body simply adds the two integers x and y and returns the sum.

Here's another example that shows how to declare a method:

type Person struct {
   name string
}
func (p Person) introduce() {

   fmt.Printf("Hello, my name is %s\n", p.name)

}

In this example, Person is the struct type and introduce is a method that belongs to the Person type. The p Person is the receiver of the method, which allows you to access the fields and methods of the Person struct. The method simply prints out a message introducing the person by name.