Re: Finding object array index when iterating through array
Re: Finding object array index when iterating through array
- Subject: Re: Finding object array index when iterating through array
- From: Peter <email@hidden>
- Date: Thu, 08 Mar 2012 14:28:42 +0100
Am 08.03.2012 um 03:39 schrieb Greg Parker:
> On Mar 6, 2012, at 6:19 PM, Marco Tabini <email@hidden> wrote:
>>> I have an array and I am iterating through it using this technique:
>>>
>>>> for (id object in array) {
>>>> // do something with object
>>>> }
>>>
>>> Is there way to obtain the object's current array index position or do I have to add a counter?
>>
>> [array indexOfObject:object] should do the trick, though, if you need to do it at every iteration, keeping a counter may be better.
>
> Note that -indexOfObject: returns an object from the array that is -isEqual: to the parameter. This might not be the same object that you are looking at.
>
> -indexOfObjectIdenticalTo: would solve the -isEqual: problem, but would still return the wrong index if the same object were in the array twice.
>
> You should add a counter to your for..in loop, or use a traditional counted for loop and -objectAtIndex:
Finally...
After reading so much "doubtful" (= outright bad) advice I began to doubt my own understanding of Objective-C.
What a relief!
Thank you!
Peter
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