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Re: !foo vs foo == nil

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Re: !foo vs foo == nil

Subject: Re: !foo vs foo == nil
From: "John C. Randolph" <email@hidden>
Date: Wed, 20 Aug 2008 16:56:32 -0700

On Aug 20, 2008, at 4:15 PM, Torsten Curdt wrote:

There was a common perception that NULL is not really the same as nil. But seems like in the end it really is (void*)0.

They differ in type, not in value.

"NULL" is (void *) 0.
"nil" is (id) 0.
"Nil" is (Class) 0.

Personally, I prefer "if (!foo)" over "if (foo == nil)", because the latter has the hazard of a typo that compiles. You can lose a fair bit of time staring at "if (foo = nil)" before you spot the mistake.

-jcr

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References:  
  >!foo vs foo == nil (From: Torsten Curdt <email@hidden>)
  >Re: !foo vs foo == nil (From: Filip van der Meeren <email@hidden>)
  >Re: !foo vs foo == nil (From: Torsten Curdt <email@hidden>)




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