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@implementation NSString (RosettaCodeAddition)
- (NSString *) repeatStringByNumberOfTimes: (NSUInteger) times {
return [@"" stringByPaddingToLength:[self length]*times withString:self startingAtIndex:0];
// This assertion ensures that we're repeating the string at least once.
NSAssert (times >= 0,
@"The receiver should be repeated at least once.");
// We need a mutable copy of ourself to concatenate the repetitions.
NSMutableString *workingCopy = [self mutableCopy];
// Append the receiver to workingCopy the number of times specified.
for (NSUInteger i = 1; i <= times; i++)
[workingCopy appendString:self];
// All done; return an autoreleased copy.
return [workingCopy autorelease];
}
@end</lang>
// Display the NSString.
NSLog(@"%@", [aString description]);</lang>
// NB: The other Rosetta Code implementations interpret the task in a
// mathematical sense, i.e. repeating "ha" five times being analogous
// to multiplying the string five times. This implementation does not
// follow that convention for one reason: repeating a string _once_
// should yield two strings, the original string appended to a single
// repetition of the string. In other words, repeating @"ha" once should
// return @"haha", otherwise the method isn't upholding the contract
// implied by its name.</lang>
=={{header|OCaml}}==
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