Re: Unique strings array
Re: Unique strings array
- Subject: Re: Unique strings array
- From: Stevo Brock <email@hidden>
- Date: Fri, 11 Mar 2011 18:33:31 -0800
Unless I'm missing something, if you have aWord1 = @"the" and aWord2 = @"the", they will both get added to the array/set.
You can also use an NSMutableDictionary - just
for (NSString* word in wordsArray)
[dict setObject:anything forKey:word];
NSArray* uniqueWords = [dict allKeys];
-Stevo
On Mar 11, 2011, at 6:19 PM, Dave DeLong wrote:
> Use an NSMutableSet instead. That should have constant lookup time instead of linear (like an array usually is).
>
> Dave
>
> Sent from my iPhone
>
> On Mar 11, 2011, at 6:11 PM, Leonardo <email@hidden> wrote:
>
>> Hi,
>> I have to extract a list of "unique words" from an array of hundred
>> thousands words and put them into an uniqueWordsArray. I already succeeded
>> but the task is very very slow because I don't index the uniqueWordsArray.
>> So my question is: how to index the array and get a fast check?
>> Actually I do:
>>
>> for(NSString *aWord in wordsArray){
>> if([uniqueWordsArray containsObject:aWord] == NO){
>> [uniqueWordsArray addObject:aWord];
>> }
>> }
>>
>> You understand well that the task works fast at the beginning, but it gets
>> slower and slower at any word added to the uniqueWordsArray.
>> What's the best way to do that?
>> Should I use the internal SQLLite database? CoreData? Other?
>>
>>
>> Regards
>> -- Leonardo
>>
>>
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