On Apr 24, 2014, at 4:10 PM, Alex Zavatone <z...@mac.com> wrote:
> Could we throw a category on NSObject for that and then every class that
> originates with NSObject gets that lovely method?
Not exactly, because unlike Smalltalk's nil, Objective-C's nil is *not* an
object. But you could switch it around:
@implementation NSObject (NilCheck)
- (id)fallbackIfNil:(id)obj { return obj ?: self; }
@end
I still don't see how
foo = [@"Something" fallbackIfNil:foo];
has any advantage over
foo = foo ?: @"Something";
which is less verbose, doesn't have the cost of a message send, and uses an
operator the reader of the code should already know.
--Andy
>
> Agree on the clunky bit, but so is using the @ compiler directive to
> accomplish everything that couldn't be fit in in the first place. Not as if
> I know a better way to do it, but I agree, they do feel clunky.
>
> On Apr 24, 2014, at 3:48 PM, Lee Ann Rucker wrote:
>
>> 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.
>
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