How to join NSArray elements into an NSString?

NSArray * stuff = /* ... */;
NSString * combinedStuff = [stuff componentsJoinedByString:@"separator"];

This is the inverse of -[NSString componentsSeparatedByString:].

-componentsJoinedByString: on NSArray should do the trick.

There's also this variant, if your original array contains Key-Value objects from which you only want to pick one property (that can be serialized as a string ):

@implementation NSArray (itertools)


-(NSMutableString *)stringByJoiningOnProperty:(NSString *)property separator:(NSString *)separator
{
NSMutableString *res = [@"" mutableCopy];
BOOL firstTime = YES;
for (NSObject *obj in self)
{
if (!firstTime) {
[res appendString:separator];
}
else{
firstTime = NO;
}
id val = [obj valueForKey:property];
if ([val isKindOfClass:[NSString class]])
{
[res appendString:val];
}
else
{
[res appendString:[val stringValue]];
}
}
return res;
}




@end