这是什么=！操作员？ [英] What's this =! operator?

问题描述

我对此代码感到惊讶：

  if（a =！b）{//让它处于false b $ b ... 
} 
  

但 code>从不由值分配。

解决方案

这是两个运算符， = code>！，而不是一个。

  a =！b; 
 if（a）{
 // whatever 
} 
  

将设置为 b 的逻辑反函数，并测试结果是否为真（或等效地，是否<$



或者可能是 a！= b

的错误类型， code>。

I was surprised by this code:

if (a =! b) { // let it be on false
    ...
}

But a is never assigned by a value. What's this operator about?

解决方案

That's two operators, = and !, not one. It might be an obfuscated way of writing

a = !b;
if (a) {
    // whatever
}

setting a to the logical inverse of b, and testing whether the result is true (or, equivalently, whether b was false).

Or it might be a mistyping of a != b.

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