Go, Golang : array type inside struct, missing type composite literal

Question

I need to add slice type to this struct.

 type Example struct {
    text  []string
 }

 func main() {
    var arr = []Example {
        {{"a", "b", "c"}},
    }
    fmt.Println(arr)    
 }

Then I am getting

  prog.go:11: missing type in composite literal
  [process exited with non-zero status]

So specify the composite literal

    var arr = []Example {
         {Example{"a", "b", "c"}},

But still getting this error:

    cannot use "a" (type string) as type []string in field value

http://play.golang.org/p/XKv1uhgUId

How do I fix this? How do I construct the struct that contains array(slice) type?

starball · Accepted Answer · 2022-12-25 07:02:18Z

52

Here is your proper slice of Example struct:

[]Example{
  Example{
   []string{"a", "b", "c"},
  },
}

Let me explain it. You want to make a slice of Example. So here it is — []Example{}. Then it must be populated with an Example — Example{}. Example in turn consists of []string — []string{"a", "b", "c"}. It just the matter of proper syntax.

edited Dec 25, 2022 at 7:02

starball♦

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answered Oct 20, 2013 at 20:44

Kavu

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3 Comments

user2671513 Over a year ago

How about this? It has more values and not working for another reason. Can't figure out

mna Over a year ago

If you don't name your fields in the literal notation, you have to provide a value for all fields, otherwise name the field. golang.org/ref/spec#Composite_literals . Working example based on yours: play.golang.org/p/13OSJHd5xe

Nick Craig-Wood Over a year ago

Note that you don't need the second Example - go is smart enough to figure out that an []Example is full of Example items without explicitly naming them. Playground

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