可以将"else if"与三元运算符一起使用吗? [英] can I use `else if` with a ternary operator?

问题描述

我只能在三元运算符语法的语句中使用if和else还是可以以某种方式包含else if?

Can I only use if and else in a statement in ternary operator syntax or can I also somehow include an else if?

示例:

if(a) {
   x
}
else if(y) {
   c
}
else {
   b
}

推荐答案

与具有可选else或可选else if分支的if不同，三元运算符具有两个且只有两个分支.

Unlike an if with optional else or optional else if branches, a ternary operator has two and only two branches.

如果您对第二个子句进行分支，则可以具有类似else if的功能:

You can have else if like functionality if you sub-branch the second clause:

a ? b : (c ? d : e)

这通常不是一个好主意，因为三元操作开始时可能会很麻烦，并且像这样进行分层通常是对难以维护的代码的一种快速训练.

This is usually a bad idea as ternary operations can be messy to start with and layering like this is usually an express train to unmaintainable code.

最好写:

if (a) {
  b
}
else if (c) {
{
  d
}
else {
  e
}

这比较冗长，但很清楚.

This is more verbose, but abundantly clear.

如果过于激进地使用三元，您将得到如下代码:

If you use ternaries too agressively you'll end up with code like:

a()?c?d?e:f:g:h?i(j?k:l?m:n):o

任何人都在猜测那里发生了什么.

Where it's anyone's guess what's going on in there.

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