Question

What is the difference between:

[blah addObject:@"1"];

And

[blah insertObject:@"0" atIndex:0];

???

I know they’re both for a NSMutableArray.

Answer 1

addObject adds an object at last. insertObject:atIndex adds an object at specified index. All objects further to that specified index are shifted one position right.

For example, say you have an array with following objects:

A B C D

And you add E using addObject. Then it will look like:

A B C D E

Then you insert F at index 2. Then it will look like:

A B F C D E