Objective-C How to print NSSet on one line (no trailing comma / space)

Question

Im trying to print out an NSSet on a single line, comma separation but no trailing comma or space. how can i do this?

i know that this works for an array:

    NSMutableString *outputStringArray = [[NSMutableString alloc] init];
    NSMutableArray *myArray = [[NSMutableArray alloc] initWithCapacity:10];

    for (int k = 0; k < [myArray count]; k++) {
        [outputStringArray appendFormat:@"%@, ", [myArray objectAtIndex:k]];
    }
    NSLog(@"%@", [outputStringArray substringToIndex:[outputStringArray length] - 2]);

but since sets don't have indexing i cant do this.

thanks

score 10 · Accepted Answer · edited Dec 02 '16 at 11:38

10

You can always make an array out of a set, like this:

NSArray *myArray = [mySet allObjects];

After that, you can get your string with componentsJoinedByString::

NSString *str = [myArray componentsJoinedByString:@", "];

Of course you can achieve the same effect with a simple loop similar to the one in your post:

BOOL isFirst = YES;
for (id element in mySet) {
    if (!isFirst) {
        [outputStringArray appendString:@", "];
    } else {
        isFirst = NO;
    }
    [outputStringArray appendFormat:@"%@", element];
}

edited Dec 02 '16 at 11:38

CRD

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answered Mar 13 '13 at 10:07

Sergey Kalinichenko

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Using your loop there isn't a comma between the first and second element with building the string. – aqua Mar 13 '13 at 10:17
@aqua Did you try it? It should be there. – Sergey Kalinichenko Mar 13 '13 at 10:25

score 7 · Answer 2 · answered Mar 13 '13 at 10:07

7

Get the objects in your set as an array and use componentsJoinedByString:

NSSet *myset = ....;
NSString *joinedString = [[myset allObjects] componentsJoinedByString:@", "];

answered Mar 13 '13 at 10:07

Joris Kluivers

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Objective-C How to print NSSet on one line (no trailing comma / space)

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