三元运算符作为简短的条件语句

发布于 2025-01-08 05:34:39 字数 265 浏览 0 评论 0原文

在 Javascript 中使用三元运算符代替较长的条件语句有什么问题吗，例如使用：

(variable == "dog") ? dog_stuff() : false;

而不是

if ( variable == "dog" ) 
{
    dog_stuff();
}

这听起来像是一个愚蠢的问题，但我只是发现它非常快速且易于阅读，我只是不想成为如果存在可能的缺点，请使用它？

原文

Is there anything wrong with using ternary operators in place of longer conditional statements in Javascript, for instance using:

(variable == "dog") ? dog_stuff() : false;

Rather than

if ( variable == "dog" ) 
{
    dog_stuff();
}

This may sound like a stupid question but I just find it's pretty quick and easy to read, I just don't want to be using it if there's a possible drawback?

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℉絮湮 2025-01-15 05:34:39

也可以这样写

(variable == 'dog') && dog_stuff();

如果没有 else 语句，

。 backbone.js 中的几行：

  options || (options = {});
  models = _.isArray(models) ? models.slice() : [models];
  model = this.getByCid(models[i]) || this.get(models[i]);

如果非常有必要，您可以对多个语句进行分组：

(1==1) && (a=2,b=3)
alert(a); // 2
alert(b); // 3

You could also write

(variable == 'dog') && dog_stuff();

if you don't have an else statement.

A few lines from backbone.js:

  options || (options = {});
  models = _.isArray(models) ? models.slice() : [models];
  model = this.getByCid(models[i]) || this.get(models[i]);

You can group multiple statements, if it's very necessary:

(1==1) && (a=2,b=3)
alert(a); // 2
alert(b); // 3

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流星番茄 2025-01-15 05:34:39

这是错误的，因为您告诉代码执行 false。想象一下下面的代码：

if ( variable == "dog" ) 
{
    dog_stuff();
} else {
    false;
}

在我看来，4 行条件函数调用完全没问题。您可以将其简写为：

if (variable == "dog") dog_stuff();

唯一的问题是，如果您将其注释掉，或者添加 1 个以上的函数，那么事情看起来是正确的，但无法正确执行：

if (variable == "dog") dog_walk(); dog_bark(); // dog_bark executes always!
if (variable == "dog") // dog_walk();
earn_cash(); // suddenly earn_cash() is dog-dependent.

It's wrong because you're telling your code to execute false. Imagine the following code:

if ( variable == "dog" ) 
{
    dog_stuff();
} else {
    false;
}

IMO the 4 line conditional function call is perfectly fine. You can shorthand it to:

if (variable == "dog") dog_stuff();

The only problem with this is if you comment it out, or add 1 more function then things look correct, but don't execute correctly:

if (variable == "dog") dog_walk(); dog_bark(); // dog_bark executes always!
if (variable == "dog") // dog_walk();
earn_cash(); // suddenly earn_cash() is dog-dependent.

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