C的三元运算符的惯用的Go等价物是什么？ [英] What is the idiomatic Go equivalent of C's ternary operator?

问题描述

在C / C ++（以及该族的许多语言）中，根据条件声明和初始化变量的常用习惯用法是使用三元条件运算符：

  int index = val> 0？ val：-val 
  

Go没有条件运算符。实现与上面相同的一段代码的最习惯的方式是什么？我来到了以下解决方案，但它看起来很冗长

  var index int 
 
如果val> ; 0 {
 index = val 
} else {
 index = -val 
} 
  

有没有更好的方法？

解决方案

正如指出的那样（希望不出所料） c $ c> if + else 确实是习惯用法在Go中执行条件。 / p>

除了完整的 var + if + else 代码块之外，这种拼写也经常被使用：

  index：= val 
如果val <= 0 {
 index = -val 
 
 $ / code> 

如果您有足够重复的代码块，例如相当于 int value = a< = b？ a：b ，您可以创建一个函数来保存它：



  func min（a，b int）int {
如果a< = b {
返回a 
} 
返回b 
} 
 
 ... 
 
 value：= min（a，b）
  

编译器会内联这么简单功能，所以它更快，更清晰，更短。

In C/C++ (and many languages of that family), a common idiom to declare and initialize a variable depending on a condition uses the ternary conditional operator :

int index = val > 0 ? val : -val

Go doesn't have the conditional operator. What is the most idiomatic way to implement the same piece of code as above ? I came to the following solution, but it seems quite verbose

var index int

if val > 0 {
    index = val
} else {
    index = -val
}

Is there something better ?

解决方案

As pointed out (and hopefully unsurprisingly), using if+else is indeed the idiomatic way to do conditionals in Go.

In addition to the full blown var+if+else block of code, though, this spelling is also used often:

index := val
if val <= 0 {
    index = -val
}

and if you have a block of code that is repetitive enough, such as the equivalent of int value = a <= b ? a : b, you can create a function to hold it:

func min(a, b int) int {
    if a <= b {
        return a
    }
    return b
}

...

value := min(a, b)

The compiler will inline such simple functions, so it's fast, more clear, and shorter.

这篇关于C的三元运算符的惯用的Go等价物是什么？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！