What is the difference between NSArray and NSMutableArray?

Regular NSArray is Immutable , i,e  whenever you create an NSArray object and initialize some values to that and later sometime in the project if u have to add some value or object to that instance of an array it won't let u do that.

NSArray *myArray = [NSArray arrayWithObjects: @"1", @"two", @"3", nil];

Here unlike the C-style Arrays you don't explicitly declare the size of an array, it will automatically does it until it hits nil.
The problem here is, sometime later if u want to add or remove object , you will not be able to do with the regular arrays. NSMutableArray which is the subclass of NSArray does this for you.

NSMutableArray *myArray = [NSArray arrayWithObjects: @"1", @"two", @"3", nil];

sometime later  if you want to add a string or object to this array, there are methods in NSMutableArray which lets you to do this.

[myArray addObject: @"four"];
[myArray removeObjectAtIndex:2];


  1. Nice one ... it helps me to understand the difference.

    Thank you.

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  3. You could just work harder and write an original answer instead of copying it verbatim from Stackoverflow, right?

  4. please explain me atomic and nonatomic with example

    1. https://www.quora.com/What-is-the-difference-between-strong-retain-nonatomic-etc-in-the-Objective-C-iOS-property

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