Question

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Should I prefer to use literal syntax or constructors for creating dictionaries and arrays?

Is there any difference between:

NSArray *array = @[@"foo", @"bar"];

and

NSArray *array = [NSArray arrayWithObjects:@"foo", @"bar", nil];

Is one of those more stable, faster, or anything else?

Answer 1

This documentation doesn’t mention anything about efficiency directly, but does mention that

NSArray *array = @[@"foo", @"bar"];

is equivalent to

NSString *strings[3];
strings[0] = @"foo";
strings[1] = @"bar";
NSArray *array = [NSArray arrayWithObjects:strings count:2];

I would have to assume that at an assembly level, the two are identical.

Thus the only difference is preference. I prefer the former, it’s faster to type and more direct to understand.