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9.1

How do I remove duplicates in NSMutableArray

Asked by barnwillyb in Objective-C Programming Language, Apple Programming, C++ Programming Language

Tags: Objective-C, Mac

I am not sure how to remove duplicate numbers in a NSMutableArray and whether to remove them before sorting or not.  And is there an easy way to remove duplicate numbers before they are even added to the array?  This is not homework.
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#import <Foundation/Foundation.h>
 
int main (int argc, const char * argv[]) {
    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc]init];
    
    NSNumberFormatter *numberFormatter = [[NSNumberFormatter alloc]init];
    [numberFormatter setFormatterBehavior:NSNumberFormatterBehavior10_4];
    [numberFormatter setFormat:@"00"];
    NSString *myNumberString;
    NSMutableArray *array;
    int i;
    NSNumber *newNumber;
    NSNumber *numbersToPrint;
 
    printf ("\n");
    array = [[NSMutableArray alloc]init];
    // Initialize the random number generator.
    srandom(time(NULL));
    for (i = 0; i < 6; i++) {
        newNumber = [[NSNumber alloc]initWithInt:random() % 55 + 1];
        myNumberString = [numberFormatter stringFromNumber:newNumber];
        [array addObject:myNumberString];
        [array sortUsingSelector:@selector(compare:)];
        [newNumber release];
    }
 
    // Using NSLog
    for (i = 0; i < 6; i++) {
        numbersToPrint = [array objectAtIndex:i];
        NSLog(@"The number at index %d is %@.", i, numbersToPrint);
    }
 
    [array release];
    [pool drain];
 
    return 0;
}
[+][-]11/05/08 11:59 AM, ID: 22889127Accepted Solution

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About this solution

Zones: Objective-C Programming Language, Apple Programming, C++ Programming Language
Tags: Objective-C, Mac
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Solution Provided By: AJVienna
Participating Experts: 2
Solution Grade: A
 
[+][-]11/05/08 04:22 PM, ID: 22891424Expert Comment

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[+][-]11/06/08 01:54 PM, ID: 22900026Expert Comment

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[+][-]11/07/08 11:29 AM, ID: 22907711Expert Comment

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