Subject: Re: Is "-init" really needed?



> On Aug 10, 2017, at 8:59 AM, Alastair Houghton
> <[email protected]> wrote:
>
> On 10 Aug 2017, at 14:57, [email protected]
> <mailto:[email protected]> wrote:
>>
>> On Aug 10, 2017, at 02:18, Alastair Houghton <[email protected]>
>> wrote:
>>>
>>> Personally I *would* still discourage +new in favour of class-specific
>>> convenience constructors because I think it’s less expressive and also less
>>> consistent (e.g. +array is better, in my opinion, than +new, not least
>>> because +arrayWithObjects: and others exist).
>>
>> [NSArray new] := [[NSArray alloc]init]
>>
>> [NSArray array] := [[[NSArray alloc]init]autorelease]
>>
>> +array and friends came along with the introduction of autorelease pools, to
>> replace +new with something that didn't imply ownership (the oft mentioned
>> special meaning of "new" as prefix). So while with ARC they are essentially
>> equivalent, previously they were not.
>
> Yes, I know that, thanks.
>
> The point is, with ARC, they’re equivalent, and most new code uses ARC, so,
> again, I’d discourage +new in favour of class-specific convenience
> constructors.
>
> Kind regards,
>
> Alastair.

They’re equivalent syntactically, but performance-wise, +array and friends will
cause the object to be put into an autorelease pool. Therefore, +new is better
for performance.

Charles

...

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