2D arrays using NSMutableArray

Question

I need to create a mutable two-dimensional array in Objective-C.

For example I have:

NSMutableArray *sections;
NSMutableArray *rows;

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Answer 1

This is what I did in order to initialize array of arrays.

NSMutableArray *arrayOfArrays = [[NSMutableArray alloc] initWithCapacity:CONST];

for (int i=0; i<=CONST; i++) {
    [arrayOfArrays addObject:[NSMutableArray array]];
}

Then later in a code I could simply:

[[arrayOfArrays objectAtIndex:0] addObject:myObject];