How to Pass Array or Slice Parameters to Sprintf in Go?

Passing Variable Parameters to Sprintf in Go

The Printf function in Go allows for formatting and printing output using a specified format string, followed by a variable number of parameters. However, if you wish to pass an array or slice of values as parameters, you may encounter type errors.

Consider the following example:

<code class="go">s := []string{"a", "b", "c", "d"}  // Result from regexp.FindStringSubmatch()
fmt.Printf("%5s %4s %3s\n", s[1], s[2], s[3])</code>

Running this code yields the error:

cannot use v (type []string) as type []interface {} in argument to fmt.Printf

To resolve this, you must declare your slice as a type []interface{}. This is because Printf expects parameters of that type.

s := []interface{}{"a", "b", "c", "d"}
fmt.Printf("%5s %4s %3s\n", s[1], s[2], s[3])

Another option is to manually convert your []string to []interface{} before passing it to Printf.

<code class="go">ss := []string{"a", "b", "c"}
is := make([]interface{}, len(ss))
for i, v := range ss {
    is[i] = v
}</code>

Using this approach allows you to pass the is slice as a variable parameter to Printf.

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