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?
-(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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