Merge two arrays while preserving the original array order

Question

I\'ve writing an application that requests data from an external source (Twitter), which is returned as an ordered array in chronological order:

External array

Answer 1

Just use the new array as the first array and add the old items after.

NSMutableArray *newArray = [NSMutableArray arrayWithCapacity:externalArray.count + myArray.count];
for(NSDictionary *item in externalArray) {

    // Need loop so I can do some extra stuff here with each item object (not shown in this example.)
    [newArray addObject: item];
}

[newArray addObjectsFromArray:myArray];