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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