Re: Stupid objective-c question
Re: Stupid objective-c question
- Subject: Re: Stupid objective-c question
- From: Quincey Morris <email@hidden>
- Date: Wed, 21 Sep 2016 22:33:05 -0700
- Feedback-id: 167118m:167118agrif8a:167118sS5zSm_QeE:SMTPCORP
On Sep 21, 2016, at 21:47 , Jeff Evans <email@hidden> wrote:
>
> Of course, so [[NSArray alloc]init] is actually useless; I hadn't thought of that. No one would ever declare an array that way.
Just continuing my nitpicking tour of this thread:
It isn’t useless. Sometimes you really want an empty array. For example, there are Cocoa APIs that have a parameter that’s an array of (say) options. In some cases, an API might accept nil as meaning “no options”, but in others it might throw an exception. It’s safer to pass [[NSArray alloc] init], or [NSArray array], or @[].
Another example where it might be needed is if you’re using “arrayByAddingObject:” or “arrayByAddingObjectsFromArray:” to construct an array, and you might want to start, conditionally, from an existing array or an empty array.
So it’s degenerate perhaps, but not exactly useless.
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