ObjFW  Diff

{
	OFMutableString *new = [OFMutableString stringWithString: self];
	[new appendFormat: format arguments: arguments];
	[new makeImmutable];
	return new;
}

- (OFString *)stringByPrependingString: (OFString *)string
{
	OFMutableString *new = [[string mutableCopy] autorelease];
	[new appendString: self];
	[new makeImmutable];
	return new;
}

- (OFString *)stringByReplacingOccurrencesOfString: (OFString *)string
					withString: (OFString *)replacement
{
	OFMutableString *new = [[self mutableCopy] autorelease];
	[new replaceOccurrencesOfString: string withString: replacement];
	[new makeImmutable];
	return new;