On Sep 20, 2014, at 1:01 PM, 2551 <2551p...@gmail.com> wrote: > I've searched high and low (or roundabouts in circles) for a built in method > that will return the difference between two strings as a string. > > I hacked up this solution below, but it feels cludgy and isn't very robust > (punctuation will mess it up a little); worse, I can't help feeling I must be > reinventing the wheel. Finding the string that is the difference between two > other strings must be a basic need. How do you guys do this?
Define what you mean the “difference between two strings”.
>
>
>
> -(NSString *)getDifference: (NSString *)aString and:(NSString *)anotherString
> {
> int i = aString.length;
> int j = anotherString.length;
> NSString *result, *longest, *shortest;
>
> if (i == j) {
> result = @"";
> return result;
> }
>
> if (i > j) {
> longest = aString;
> shortest = anotherString;
> } else {
> longest = anotherString;
> shortest = aString;
> }
>
> NSArray *fa = [longest componentsSeparatedByString: @" " ];
> NSArray *sa = [shortest componentsSeparatedByString: @" "];
> NSMutableArray *remainder = [NSMutableArray arrayWithArray:fa];
> [remainder removeObjectsInArray:sa];
> result = [remainder componentsJoinedByString:@" "];
> return result;
>
> }
>
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