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

问题描述

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

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 没有条件运算符.实现与上面相同的代码段的最惯用的方法是什么?我得出了以下解决方案，但似乎很冗长

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
}

还有更好的吗?

推荐答案

正如所指出的(希望不出所料)，使用 if+else 确实是 在 Go 中做条件的惯用方式.

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

除了完整的 var+if+else 代码块之外，这种拼写也经常使用:

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
}

并且如果您有足够重复的代码块，例如 int value = a <= b 的等价物?a :b，你可以创建一个函数来保存它:

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)

编译器会内联这些简单的函数，所以它更快、更清晰、更短.

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

这篇关于什么是 C 的三元运算符的惯用 Go 等价物?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！