使用IF语句时是否有正确或错误的做法：if（foo）或if（foo == true）？ [英] Is there a right or wrong practice when using IF statements : if(foo) or if(foo == true)?

问题描述

在我的（短期）职业生涯迄今为止的编程（仅仅是一名从事实习的学生）中，我注意到在IF语句方面，有两种不同的方式。

Throughout my (short) career so far in programming (merely a student working on internship) I have noticed that when it comes to IF statements, there is two different ways of doing it.

如果我们将 foo 作为布尔值：

If we take foo as a boolean value:

if(foo)
{
    //do stuff
}

这是我处理IF语句时的首选方式，如果我正在寻找假的我使用：

This is my preferred way of doing things when dealing with IF statements, if I'm looking for false I use:

if(!foo)
{
    //do more stuff
}

然而，当有些人看到这个时，他们会抬起眉毛，暗示我可能会陷入一种坏习惯。但我想知道，这种方式或典型方式有什么区别吗？

However, when some people see this they raise an eyebrow, suggesting that I may be stuck in a bad habit. But I wanted to know, is there any difference between this way or the "typical" way?

if(foo == true)
{
    //do a bit more stuff
}

我是否会陷入新程序员的共同陷阱？或者没有区别（至少是一个明显的差异）

Am I falling into a common trap for new programmers? Or is there no difference (at least a noticeable one)

推荐答案

我从不写== true或== false。在我看来，它违背了if-sentence的观点。

I never write == true or == false. It goes against the point of an if-sentence, in my opinion.

如果是基本的：如果布尔表达式为真，则执行某些操作。布尔值是一个布尔表达式本身，所以为什么要包装它？

an if is basicly: If a Boolean expression is true, do something. a Boolean is a boolean expression in and of itself, so why wrap it?

所以在我看来，使用== true的那些是有坏习惯的。因为他们对语言的工作原理一无所知。

So in my opinion, the ones using == true are the ones with a bad habit. Becuase they display ignorance of how the language works.

想想这些允许的写法，如果（Foo）和if（！Foo）：

think of these "allowed" ways to write if (Foo) and if (!Foo):

if (Foo == true) //If Foo is the same as true
if (Foo != true //If Foo is not the same as true
if (Foo != false) //if Foo is not the same as false
if (Foo == false) //If Foo is the same as false
if (Foo) //If Foo
if (!Foo) //If not Foo

使用==和！=与布尔实际上在编程和阅读代码时会引入新的错误方法。

using == and != with booleans actually introduce new ways to make mistakes both when programming and reading code.

布尔和布尔很难被误读。

Boolean and !Boolean is hard to misread.

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