addObject to NSArray in Objective-C

Question

How to addObject to NSArray using this code? I got this error message when trying to do it.

NSArray *shoppingList = @[@"Eggs", @"Milk"];
NSString *flour = @"Flour";
[shoppingList addObject:flour];
shoppingList += @["Baking Powder"]

Error message

/Users/xxxxx/Documents/iOS/xxxxx/main.m:54:23: No visible @interface for 'NSArray' declares the selector 'addObject:'

Answer 1

addObject works on NSMutableArray, not on NSArray, which is immutable.

If you have control over the array that you create, make shoppingList NSMutableArray:

NSMutableArray *shoppingList = [@[@"Eggs", @"Milk"] mutableCopy];
[shoppingList addObject:flour]; // Works with NSMutableArray

Otherwise, use less efficient

shoppingList = [shoppingList arrayByAddingObject:flour]; // Makes a copy

Answer 2

You can't add objects into NSArray. Use NSMutableArray instead :)