How do I use NSMutableArray as a queue?

Question

I have NSMutableArray and used it like queue for waiting actions.

Example in array:

0: "Do something"
1: "Do something else"
2: "Do something 2"

When I used [myarray removeObjectAtIndex:0] the array is not reordering and next time when I use [myarray objectAtIndex:o] the result is nil.

How can I put "Do something else" in the first index and "Do something 2" in the second index when I remove "Do something"?

Answer 1

/* gcc -framework Cocoa myprogram.m -o myprogram */

#import <Cocoa/Cocoa.h>

int main( int argc, char **argv )
{
  NSMutableArray *array = [ [ NSMutableArray alloc ] 
                           initWithObjects: @"1", @"2", @"3",
                                            nil ]; /* don't forget nil */

  /* "pop" the first object */
  [ array removeObjectAtIndex:0 ];

  /* prints "2" as expected */
  NSLog( @"%@", [ array objectAtIndex: 0 ] );
}