50 lines
1.4 KiB
Markdown
50 lines
1.4 KiB
Markdown
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---
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title: Go Functions
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localeTitle: 去功能
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---
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## 去功能
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函数是在调用任务时执行任务的代码块，这样函数的名称就可以识别它并用于调用函数。
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函数的声明以关键字`func`开头，后跟函数的名称，然后是函数的参数，最后是返回的值类型。声明将函数名称绑定到函数。请记住，类型位于参数和返回值中的变量名之后。函数声明的示例如下
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```go
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func add(a int, b int) int
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```
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函数可以有0个或多个参数，具体取决于其所需的功能
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```go
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func zero() int { /* Function Definition */ }
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func increment(x int) int { /* Function Definition */ }
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func add(x, y int) int { /* Function Definition */ }
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```
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Go支持返回多个值。下面的函数返回2个值：2个参数的总和，以及第一个和第二个参数之间的差异
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```go
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func addAndSubtract(x, y int) (int, int) {
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return x + y, x - y
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}
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addAndSubtract(7, 4) // Returns 11, 3
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```
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Go还支持命名返回的值
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```go
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func mulitplyByThreeAndDivideByFive(x int) (product int, quotient int) {
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product = x * 3
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quotient = x / 5
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return
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}
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mulitplyByThreeAndDivideByFive(20) // Returns 60, 4
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```
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#### 更多信息：
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* [围棋之旅](https://tour.golang.org/basics/4)
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* [以身作则](https://gobyexample.com/functions)
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* [Golang Book](https://www.golang-book.com/books/intro/7)
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* [Go编程语言规范](https://golang.org/ref/spec#Function_declarations)
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