Question

Very simple question – how might I iterate through a NSMutableArray and do things for each item?

Much like the for loop in other langs:

foreach(array)
{
    dosomething();
}

Answer 1

If you want to call a method in each one, use

[array makeObjectsPerformSelector:@selector(eatFish)];

or if you want to pass an argument,

[array makeObjectsPerformSelector:@selector(eat:) withObject:myFishObject];