How to pass default value to function parameter

[Atir_Nayab]

like in js we can do

function demo(temp = 'hello'){
   console.log(temp)
}
demo()

in demo function parameter is kind of optional, if we don’t pass parameter it will default to hello

[NobbZ (Norbert Melzer)]

func demo(greeting string) {
  fmt.Println(greeting)
}

func demoWithDefault() {
  demo("hello")
}

This is how you do it in Go. Another way was through variadic arguments, but that is far less idiomatic for this usecase:

func demo(g string...) {
  switch len(g) {
  case 0: fmt.Println("Hello")
  case 1: fmt.Println(g[0])
  default: panic("too many arguments")
}

And another alternativ was by using pointer and nil:

func demo(g *string) {
  if g == nil {
    g = "Hello"
  }

  fmt.Println(g)
}