CODEWITHSUNDEEP
serializationgo
Lansana Camara
Lansana Camara

Reputation: 9873

Do functions of the `fmt` package support formatters for arrays?

I am trying to submit an email with multiple paramaters and I have emails in a separate file with some printing verbs, but since there are so many verbs I end up with a line like this:

message := fmt.Sprintf(util.CONTACT_EMAIL, form.Name, form.Email, form.Email,     form.Phone, form.Phone, form.Message, ...)

and it just goes on and on which looks bad. And the reason I repeat some verbs is to get the href's, for example <a href"mailto:%s">%s</a>, and so forth. If anyone has a better approach to that I'd really like to know.

But on to my question.. Does Go have a formatter that works similar to vsprintf in PHP? It basically takes an array as the arguments so it would be like:

string vsprintf(string $format , array $args)

..instead of the mess I have above, which allows it to be a bit more readable.

I looked on the docs but don't seem to see anything..but a lot of what Go does is still foreign to me so maybe I overlooked it.

Upvotes: 0

Views: 50

Answers (1)

Drathier
Drathier

Reputation: 14539

If you just want to pass a slice of arguments to fmt.Sprintf (or any other function that takes a variadic number of arguments) you can do that like this:

func main() {
    s := []interface{}{1,2,5}
    z := fmt.Sprintf("%d, %d, %d", s...)
    print(z)
}

or if you have a slice of anything that isn't the empty interface, we have to copy it into a slice of the empty interface:

func main() {
    s := []int{1,2,5}

    // we need to copy each element one-by-one into a []interface{} 
    // because they are laid out differently in memory in go.
    var x []interface{}
    for _, i := range s {
        x = append(x, i)
    }

    // pass the contents of the new slice into sprintf
    z := fmt.Sprintf("%d, %d, %d", x...)
    print(z)
}

Upvotes: 1

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