How to create an Array from other Array?

Question

Is there a way for creating an array from other severals arrays, in Objective C?

do you mean an Array of Arrays or Merging Arrays into one

Asad
– Asad

2010-02-14 19:43:52 +00:00
Commented Feb 14, 2010 at 19:43 — Asad
– Asad, Commented Feb 14, 2010 at 19:43

Ole Begemann · Accepted Answer · 2010-02-14 19:40:16Z

3

NSArray *arrayC = [arrayA arrayByAddingObjectsFromArray:arrayB];

answered Feb 14, 2010 at 19:40

Ole Begemann

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Dave DeLong · Accepted Answer · 2010-02-14 20:51:20Z

2

If you have a whole bunch of arrays, you can do this:

NSMutableArray * allObjects = [NSMutableArray array];
[allObjects addObjectsFromArray: array1];
[allObjects addObjectsFromArray: array2];
[allObjects addObjectsFromArray: array3];

This method prevents creating a new copy of the array each time (which is a side effect of arrayByAddingObjectsFromArray:).

Alternatively, if you have an array of arrays, and you want to combine them into a single array, you can do:

for (NSArray * objects in arrayOfArrays) {
  [allObjects addObjectsFromArray:objects];
}

Or:

allObjects = [arrayOfArrays valueForKeyPath:@"@unionOfArrays.self"];

answered Feb 14, 2010 at 20:51

Dave DeLong

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