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object == nil or nil == object

 3 years ago
source link: https://fann.im/blog/2012/06/25/object-equals-equals-nil-or-nil-equals-equals-object/
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object == nil or nil == object

Jun 25, 2012

在 Objective-C 中拿到一个对象后检查对象是否为空，一般有两种写法

if (object == nil) {
    //...
}

if (nil == object) {
    //...
}

这两种写法其实没有任何区别，从代码的可读性上来说第一种 object == nil 方式会好一点。但是推荐用第二种 nil == object 方式，最大的好处就是如果由于笔误 == 写成了 =，编译器会直接报错处理。而 object = nil 不会报错，一旦笔误写成了 object = nil 是很难 debug 查找问题。

via object == nil or nil == object to check whether an object is nil?

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