How to add an array to the top of another array in iOS

I found two good solutions in StackOverflow:

[existingArray replaceObjectsInRange:NSMakeRange(0,0)
                withObjectsFromArray:newArray];

And the second one:

NSIndexSet *indexes = [NSIndexSet indexSetWithIndexesInRange: (NSRange) {0, [newArray count]}];
[existingArray insertObjects: newArray atIndexes: indexes];