NSMutable Array removeObjectAtIndex removing two objects [duplicate]

Question

I have an NSMutableArray with 5 objects

[0] StateGeographicComponent *  0x0a455ba0
[1] StateGeographicComponent *  0x11c374b0
[2] StateGeographicComponent *  0x08e5f720
[3] StateGeographicComponent *  0x11c15430
[4] StateGeographicComponent *  0x0a458f20

After executing the following line of code:

[self.gameComponents removeObjectAtIndex:0];

Instead of simply removing the object at index 0 and sliding everything up an index as I'd expect. The object at index [0] is set to nil AND the object at index [4] is removed.

[0] id  0x00000000
[1] StateGeographicComponent *  0x11c374b0
[2] StateGeographicComponent *  0x08e5f720
[3] StateGeographicComponent *  0x11c15430

Quite perplexing to me..

Use NSLog to do the before/after dumps, or use po in the console. The debug display is likely confused. — Hot Licks
– Hot Licks, Commented Aug 15, 2013 at 2:49
Thanks Hot Licks, I was getting a bit ahead of myself and debugging without actually seeing if the debugger was displaying erroneous data. LVM seems to be quite buggy! — altyus
– altyus, Commented Aug 15, 2013 at 4:27
Yeah, someone was asking me a couple of days ago why I mostly use po in the console. This is why. — Hot Licks
– Hot Licks, Commented Aug 15, 2013 at 11:36

iCoder · Accepted Answer · 2013-08-15 02:31:41Z

-4

Use the following lines of code

[self.gameComponents replaceObjectAtIndex:0 withObject:[NSNull null]];
[self.gameComponents removeLastObject];

The first line of code replaces the object with singleton instance of NSNull and the second line of code removes the last object from the array.

answered Aug 15, 2013 at 2:31

iCoder

1,6451 gold badge15 silver badges25 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Hot Licks Over a year ago

Neither of which the OP wanted to do.

Jayprakash Dubey Over a year ago

This seems to be unwanted!

Collectives™ on Stack Overflow

NSMutable Array removeObjectAtIndex removing two objects [duplicate]

1 Answer 1

2 Comments

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Linked

Related