Variadic Functions {.en}

变参函数 {.zh}

::: {.en} Variadic functions can be called with any number of trailing arguments. For example, fmt.Println is a common variadic function. :::

::: {.zh} 可变参数函数 可以在调用时使用任意数量的参数。 例如，fmt.Println 是一种常见的变参函数。

:::

  1. package main
  2. import "fmt"

::: {.en} Here’s a function that will take an arbitrary number of ints as arguments. :::

::: {.zh}

这个函数接受任意数量的 int 作为参数。

:::

  1. func sum(nums ...int) {
  2.     fmt.Print(nums, " ")
  3.     total := 0
  4.     for _, num := range nums {
  5.         total += num
  6.     }
  7.     fmt.Println(total)
  8. }
  9. func main() {

::: {.en} Variadic functions can be called in the usual way with individual arguments. :::

::: {.zh}

变参函数使用常规的调用方式，传入独立的参数。

:::

  1.     sum(1, 2)
  2.     sum(1, 2, 3)

::: {.en} If you already have multiple args in a slice, apply them to a variadic function using func(slice...) like this. :::

::: {.zh}

如果你有一个含有多个值的 slice，想把它们作为参数 使用，可以这样调用 func(slice...)。

:::

  1.     nums := []int{1, 2, 3, 4}
  2.     sum(nums...)
  3. }
  1. $ go run variadic-functions.go 
  2. [1 2] 3
  3. [1 2 3] 6
  4. [1 2 3 4] 10

::: {.en} Another key aspect of functions in Go is their ability to form closures, which we’ll look at next. :::

::: {.zh}

Go 函数的另一个关键的方面是闭包结构，这是接下来我们将要学习的。

:::