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    <p>The following should work (did not actually compile and test the code)</p> <pre><code> NSEnumerator* enumerator; DiaryEntrys* currEntry; NSMutableDictionary* result; /* use sorting code from other answer, if you don't sort, the result will still contain arrays for each day of the week but arrays will not be sorted */ [myArray sortUsingDescriptors:....]; /* result holds the desired dictionary of arrays */ result=[[NSMutableDictionary alloc] init]; /* iterate throught all entries */ enumerator=[myArray objectEnumerator]; while (currEntry=[enumerator nextObject]) { NSNumber* currDayOfTheWeekKey; NSMutableArray* dayOfTheWeekArray; /* convert current entry's day of the week into something that can be used as a key in an dictionary I'm converting into an NSNumber, you can choose to convert to a maningfull string (sunday, monday etc.) if you like I'm assuming date_ is an NSCalendarDate, if not, then you need a method to figure out the day of the week for the partictular date class you're using Note that you should not use NSDate as a key because NSDate indicates a particular date (1/26/2010) and not an abstract "monday" */ currDayOfTheWeekKey=[NSNumber numberWithInt:[[currEntry valueForKey:@"date_"] dayOfWeek]]; /* grab the array for day of the week using the key, if exists */ dayOfTheWeekArray=[result objectForKey:currDayOfTheWeekKey]; /* if we got nil then this is the first time we encounter a date of this day of the week so we create the array now */ if (dayOfTheWeekArray==nil) { dayOfTheWeekArray=[[NSMutableArray alloc] init]; [result setObject:dayOfTheWeekArray forKey:currDayOfTheWeekKey]; [dayOfTheWeekArray release]; // retained by the dictionary } /* once we figured out which day the week array to use, add our entry to it. */ [dayOfTheWeekArray addObject:currEntry]; } </code></pre>
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    1. POObjective C - convert array of objects (with date field) into dictionary of arrays (keyed by day of week)
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    1. USEyal Redler
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    1. POObjective C - convert array of objects (with date field) into dictionary of arrays (keyed by day of week)
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    1. COThanks, Eyal. I hadn't used enumerators before, will use this in my code.
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      1. USJacko
    2. COThis code seems like it'd run into problems if you had two dates that were a week apart. They'd end up in the same bucket since they were on the same day of the week right?
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      1. USdrewish
 

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