How to print using indexes?

Is there a way to print using variable indexes?

fmt.Fprintf("%[1] %[2] %[3] %[4]", a, b, c, d)

I get errors about

> string does not implement io.Writer

Using fmt.Println prints the variable indexes as a literal.

> Package fmt
>
> Explicit argument indexes:
>
> In Printf, Sprintf, and Fprintf, the default behavior is for each
> formatting verb to format successive arguments passed in the call.
> However, the notation [n] immediately before the verb indicates that
> the nth one-indexed argument is to be formatted instead. The same
> notation before a '*' for a width or precision selects the argument
> index holding the value. After processing a bracketed expression [n],
> subsequent verbs will use arguments n+1, n+2, etc. unless otherwise
> directed.
>
> For example,
>
> fmt.Sprintf("%2d %1d\n", 11, 22)
>
> will yield "22 11"
>
> func Fprintf
>
> func Fprintf(w io.Writer, format string, a ...interface{}) (n int, err error)
>
> Fprintf formats according to a format specifier and writes to w. It
> returns the number of bytes written and any write error encountered.
>
> func Printf
>
> func Printf(format string, a ...interface{}) (n int, err error)
>
> Printf formats according to a format specifier and writes to standard
> output. It returns the number of bytes written and any write error
> encountered.

For Fprintf provide an io.Writeror use Printf. Also, add format 'verbs' to your format specifier. For example,

package main

import (
	"fmt"
	"os"
)

func main() {
	a, b, c, d := 1, 2, 3, 4
	fmt.Fprintf(os.Stdout, "%[1]d %[2]d %[3]d %[4]d\n", a, b, c, d)
	fmt.Printf("%[1]d %[2]d %[3]d %[4]d\n", a, b, c, d)
}

Output:

1 2 3 4
1 2 3 4

fmt.Fprintf has definition:
func Fprintf(w io.Writer, format string, a ...interface{}) (n int, err error)
So you need to provide writer.

For indexing you can use format like this: "%[2]d %[1]d"