Home/ Questions/Q 767177
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-05-14T17:10:09+00:00

I’ve heard that it is a bad idea to do something like this. But

  • 0

I’ve heard that it is a bad idea to do something like this. But I am sure there is some rule of thumb which can help to get that right.

When I iterate over an NSMutableDictionary or NSMutableArray often I need to get rid of entries. Typical case: You iterate over it, and compare the entry against something. Sometimes the result is “don’t need anymore” and you have to remove it. But doing so affects the index of all the rows, doesn’t it?

So how could I safely iterate over it without accidently exceeding bounds or jumping over an element that hasn’t been checked?

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    You do so by creating a temporary array or dictionary. Either

    • (Dictionary) Add the keys you want to delete later to the temporary array or
    • (Array) Add the indices you want to remove later to an NSIndexSet or
    • Add the objects you want to keep to the temporary array or dictionary

    Then either iterate over the temporary TODELETE-list, deleting from the main list (there might be utility methods for this), or replace the existing dictonary/array with your “temporary” one.

    • 0