How will I be able to remove [NSNull Null] objects from NSMutableArray?

Question

I need to remove Null object added by

 [mutArrSkills addObject:[NSNull null]];

Do I need to iterate? Is there any function to remove all null values from NSMutableArray?

If need to Iterate, how will I do that?

Illusionism

the removeObjectIdenticalTo also gonna itrate the array so why don't you itrate your self. – Dairen

Answer 1

You can use NSMutableArray's removeObjectIdenticalTo: method, as follows

[mutArrSkills removeObjectIdenticalTo:[NSNull null]];

to remove the null values. No need to iterate.

Specs

Aure you sure? I'm not because Objects are considered identical if their object addresses are the same.. AS you should know, [NSNull null] != [NSNull null]... – Rhody

Yes, as far as concerned in this case, the elements that are added by ` [mutArrSkills addObject:[NSNull null]];` are removed with that call. – Specs

AS you should know, [NSNull null] is indeed equal to [NSNull null]. There is only one instance ever of class NSNull. All objects of that class are the same pointer. – Translunar

Answer 2

removeObjectIdenticalTo:

Removes all occurrences of a given object in the array.

Discussion This method uses the indexOfObjectIdenticalTo: method to locate matches and then removes them by using removeObjectAtIndex:. Thus, matches are determined using object addresses. If the array does not contain anObject, the method has no effect (although it does incur the overhead of searching the contents).

Mukund

Aure you sure? I'm not because Objects are considered identical if their object addresses are the same.. AS you should know, [NSNull null] != [NSNull null]... – Rhody

@Rhody pls refer my answer down. – Bucko

Answer 3

You can try doing this,

NSNull *nullValue = [NSNull null]; 

[mutArrSkills removeObjectIdenticalTo:nullValue];

I hope this helps.

Bordereau

Answer 4

In Swift you first have to cast your Swift Array to NSArray, make and make it mutable so you can remove the Objective-C leftover elements, then cast it back to Array.

Fatal error: NSArray element failed to match the Swift Array Element type

// my crashing array, containing a not String element, like NSNull or anything else
let myUnsafeSwiftArray: [String]

// make it safely NSArray, then make it mutable
let mutableUnsafeArray = NSMutableArray(array: myUnsafeSwiftArray as NSArray)

// remove leftover class, like [NSNull null] aka NSNull.init()
unsafeTextures.removeObject(identicalTo: NSNull.init())

// Cast the safe array back to its supposed to by element type
let safeArray = unsafeTextures as? [String]

Milliken

Answer 5

You may iterate like this.

for(int i=0,i<[mutArrSkills count]; i++)
{
  if([[mutArrSkills objectAtIndex:i] isKindOfClass:[NSNull Class]])
    {
    [mutArrSkills removeObjectAtIndex:i];  
   }
}

Rachealrachel

That doesn't work at all if you have two successive NSNull objects in the array. – Translunar