How to add object at first index of NSArray

Question

I want to add @"ALL ITEMS" object at the first index of NSARRAY.

Initially the Array has 10 objects. After adding, the array should contains 11 objects.

Answer 1

you can't modify NSArray for inserting and adding. you need to use NSMutableArray. If you want to insert object at specified index

[array1 insertObject:@"ALL ITEMS" atIndex:0];

In Swift 2.0

array1.insertObject("ALL ITEMS", atIndex: 0)

Answer 2

First of all, NSArray need to be populated when it is initializing. So if you want to add some object at an array then you have to use NSMutableArray. Hope the following code will give you some idea and solution.

NSArray *array = [[NSArray alloc] initWithObjects:@"1",@"2",@"3",@"4",@"5",@"6",@"7",@"8",@"9",@"0", nil];
NSMutableArray *mutableArray = [[NSMutableArray alloc] init];
[mutableArray addObject:@"ALL ITEMS"];
[mutableArray addObjectsFromArray:array];

The addObject method will insert the object as the last element of the NSMutableArray.

Answer 3

I know that we have six answers for insertObject, and one for creating a(n) NSMutableArray array and then calling addObject, but there is also this:

myArray = [@[@"ALL ITEMS"] arrayByAddingObjectsFromArray:myArray];

I haven't profiled either though.