dpda53918
2013-11-14 13:39
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C的三元运算符的惯用Go等效项是什么?

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 ?

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7条回答 默认 最新

  • dongshen7407 2013-11-14 14:08
    已采纳

    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.

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