英文:
Do functions of the `fmt` package support formatters for arrays?
问题
我正在尝试使用多个参数提交电子邮件，并且我有一个单独的文件中包含一些打印动词的电子邮件，但是由于动词太多，我最终得到了这样一行代码：
message := fmt.Sprintf(util.CONTACT_EMAIL, form.Name, form.Email, form.Email, form.Phone, form.Phone, form.Message, ...)
这看起来很糟糕。我重复一些动词的原因是为了获取href，例如<a href="mailto:%s">%s</a>等等。如果有人有更好的方法，我真的很想知道。
但是接下来是我的问题.. Go语言是否有类似于PHP中的vsprintf的格式化程序？它基本上接受一个数组作为参数，就像这样：
string vsprintf(string $format , array $args)
..而不是我上面那个混乱的代码，这样可以使代码更易读。
我查看了文档，但似乎没有找到类似的内容..但是Go语言的很多东西对我来说仍然很陌生，所以也许我忽略了它。
英文:
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.
答案1
得分: 1
如果你只想将一部分参数传递给fmt.Sprintf（或任何其他接受可变数量参数的函数），你可以这样做：
func main() {
s := []interface{}{1, 2, 5}
z := fmt.Sprintf("%d, %d, %d", s...)
print(z)
}
如果你有一个除了空接口之外的任何类型的切片，我们需要将其复制到一个空接口的切片中：
func main() {
s := []int{1, 2, 5}
// 我们需要逐个将每个元素复制到 []interface{} 中，
// 因为它们在内存中的布局在 Go 中是不同的。
var x []interface{}
for _, i := range s {
x = append(x, i)
}
// 将新切片的内容传递给 sprintf
z := fmt.Sprintf("%d, %d, %d", x...)
print(z)
}
英文:
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)
}
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