Cocoa and Cocoa Touch also provide some mutable versions of its immutable classes. Once a mutable object is created, its contents can be partially or completely removed or modified. As we saw immutable array objects—an instance of NSArray—in the previous topic, I will now show you its mutable version, the NSMutableArray class, from which we will create our objects as an instance, as you can see in the following code:
/*
=============================================
We will create now a mutable version of an array, using the class NSMutableArray.
=============================================
*/
NSMutableArray *mutableSampleArray = [[NSMutableArray alloc] init];
/*
=============================================
Now, we assign to it the list of strings:
"String 1", "String 2", "String 3"
=============================================
*/
mutableSampleArray = @[@"String 1",
@"String 2",
@"String 3"];
/*
=========================================...