concatenate nsstring and excluding nulls

Question

I am trying to concatenate a few NSStrings but would like to exclude the ones that are nulls. I am using this solution:

[NSString stringWithFormat:@"%@/%@/%@", three, two, one];

but what if one of the string is null? I'd like to exclude it. any ideas?

thanks.

Answer 1

You could do:

[NSString stringWithFormat:@"%@/%@/%@", three ?: @"", two ?: @"", one ?: @""];

Or better would probably be to have a mutable string and build it up:

NSMutableString *string = [[NSMutableString alloc] initWithCapacity:0];
if (three) {
    [string appendFormat:@"%@/", three];
}
if (two) {
    [string appendFormat:@"%@/", two];
}
if (one) {
    [string appendFormat:@"%@/", one];
}