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iosobjective-cnsarray

How about the sortedArrayUsingComparator method do when I return NSOrderedSame in block?

Let's see the code: 

NSArray *array = @[@1,@3,@2,@5, @6];
NSArray *array2 = [array sortedArrayUsingComparator:^NSComparisonResult(id  _Nonnull obj1, id  _Nonnull obj2) {
return NSOrderedSame;
}];

I know the usage of return NSOrderedAscending and return NSOrderedDescending. But if I write return NSOrderedSame in the block, whether the sequence of these two item won't be changed.

Solution

  • If you want to know which sort algorithm is used in NSArray, you can go to this question: What sort function is used in NSArray?

    If you return NSOrderedSame in the sort block, the array will do nothing for all algorithms. :)