In Smalltalk, where nil is an object like everything else, and we were working
with calls out to C APIs that had a lot of required parameters, we added an
"orIfNil:" that was very useful:
foo := bar orIfNil:10.
Nil
orIfNil:other
^other
Object
orIfNil:other
^self
It would be useful in ObjC if there were an elegant way to do it. Macros are
just clunky.
On Apr 24, 2014, at 8:12 AM, Luther Baker wrote:
> Not native and I've no idea when or if this is a good idea ... nor am I sure
> how much typing you want to do ... but you _could_ create a class convenience
> method for this
>
> x = [Thing defaultIfNil:x];
>
> With shorter or longer names as you see fit ... down to possibly:
>
> x = [Thing :x]
>
> I've really no idea if that syntax would work but it stands out and might be
> easy to use and identify in the code!
>
> -Luther
>
>
>> On Apr 24, 2014, at 9:33 AM, Alex Zavatone <z...@mac.com> wrote:
>>
>> I was just asked yesterday if there is any shorthand in Objective-C for "if
>> this thing = nil, then instantiate a new instance from the class"
>>
>> Something like this:
>>
>> NSString x;
>>
>> if ([x isEqualtoString:nil]) {
>> x = @"yo";
>> }
>>
>> Feel free to replace NSString with any class.
>>
>> And we messed around a bit looking for any shorthand and though it looked
>> like a terrible idea since the comparison is done against integers using the
>> ternary operator, I'd like to know exactly why it's a terrible idea.
>>
>> NSString x;
>>
>> x = (x) ?: @"yo";
>>
>> Thanks in advance.
>> - Alex
>>
>> _______________________________________________
>>
>> Cocoa-dev mailing list (Cocoa-dev@lists.apple.com)
>>
>> Please do not post admin requests or moderator comments to the list.
>> Contact the moderators at cocoa-dev-admins(at)lists.apple.com
>>
>> Help/Unsubscribe/Update your Subscription:
>> https://urldefense.proofpoint.com/v1/url?u=https://lists.apple.com/mailman/options/cocoa-dev/lutherbaker%2540gmail.com&k=oIvRg1%2BdGAgOoM1BIlLLqw%3D%3D%0A&r=yJFJhaNnTZDfFSSz1U9TSNMmxGyib3KjZGuKfIhHLxA%3D%0A&m=6T3UPQaZo%2FpOzrcZ5K8HUhNh7uHOsfGoVY1bHCvudI4%3D%0A&s=35234c047f9691472c3b6bb62075ae02d99cab0034ff682df0b44aee655ac27e
>>
>> This email sent to lutherba...@gmail.com
>
> _______________________________________________
>
> Cocoa-dev mailing list (Cocoa-dev@lists.apple.com)
>
> Please do not post admin requests or moderator comments to the list.
> Contact the moderators at cocoa-dev-admins(at)lists.apple.com
>
> Help/Unsubscribe/Update your Subscription:
> https://urldefense.proofpoint.com/v1/url?u=https://lists.apple.com/mailman/options/cocoa-dev/lrucker%2540vmware.com&k=oIvRg1%2BdGAgOoM1BIlLLqw%3D%3D%0A&r=yJFJhaNnTZDfFSSz1U9TSNMmxGyib3KjZGuKfIhHLxA%3D%0A&m=6T3UPQaZo%2FpOzrcZ5K8HUhNh7uHOsfGoVY1bHCvudI4%3D%0A&s=7334f62adc31bd2a1e8d5e29e538694c8e2ee44b0b125b0d6f8b087cef0dbca7
>
> This email sent to lruc...@vmware.com
_______________________________________________
Cocoa-dev mailing list (Cocoa-dev@lists.apple.com)
Please do not post admin requests or moderator comments to the list.
Contact the moderators at cocoa-dev-admins(at)lists.apple.com
Help/Unsubscribe/Update your Subscription:
https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com
This email sent to arch...@mail-archive.com
