Functions {.en}

函数 {.zh}

::: {.en} Functions are central in Go. We’ll learn about functions with a few different examples. :::

::: {.zh}

函数是 Go 的核心。我们将通过几个不同的例子来了解函数。

:::

package main
import "fmt"

::: {.en} Here’s a function that takes two ints and returns their sum as an int. :::

::: {.zh}

这是一个函数，接受两个 int 类型参数并且以 int 类型返回它们的和。

:::

func plus(a int, b int) int {

::: {.en} Go requires explicit returns, i.e. it won’t automatically return the value of the last expression. :::

::: {.zh}

Go 需要明确的返回值，即它不会自动返回最后一个表达式的值。

:::

    return a + b
}

::: {.en} When you have multiple consecutive parameters of the same type, you may omit the type name for the like-typed parameters up to the final parameter that declares the type. :::

::: {.zh}

当您有连续的多个相同类型的参数时，只需要在最后一个参数末尾声明类型，前面的可以省略类型名称。

:::

func plusPlus(a, b, c int) int {
    return a + b + c
}
func main() {

::: {.en} Call a function just as you’d expect, with name(args). :::

::: {.zh}

使用 name(args) 调用函数。

:::

    res := plus(1, 2)
    fmt.Println("1+2 =", res)
    res = plusPlus(1, 2, 3)
    fmt.Println("1+2+3 =", res)
}

$ go run functions.go 
1+2 = 3
1+2+3 = 6

::: {.en} There are several other features to Go functions. One is multiple return values, which we’ll look at next. :::

::: {.zh}

Go 功能还有其他一些功能。一个是多个返回值，接下来我们将学习此功能。

:::