iOS: Creating arrays and dictionaries a bit easier

In other languages, you can often do the following to get or set an item from an array:

array[index] = . . .;
But Objective-C has always required you to use verbose methods such as:

[array objectAtIndex:. . .]

Happy days have arrived, for the creators of Objective-C have finally brought us the goodies. From now on, you can simply use [ ] brackets to index arrays, dictionaries, and even your own classes!
MasterViewController.m calls objectAtIndex: in quite a few places, for example in tableView:titleForHeaderInSection:. That method currently looks like this:

- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
{
if (sortedByName)
return [sortedSectionNames objectAtIndex:section]; else

return nil;

}

You can now simplify it to the following:

- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
{
if (sortedByName)
return sortedSectionNames[section]; else

return nil;

}

That looks a lot more natural, especially if you have programmed in other languages before. (It’s also the syntax C uses for regular C arrays.)
Another example is tableView:numberOfRowsInSection:

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
if (sortedByName)

{
NSString *sectionName = [sortedSectionNames
objectAtIndex:section]; return [[namesDictionary objectForKey:sectionName]

count];

}
else

{
return [sortedValues count];
} 
}

You can simplify this to:

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
if (sortedByName) {
NSString *sectionName = sortedSectionNames[section];
return [namesDictionary[sectionName] count]; }
else
{
return [sortedValues count];
} }