Remove specific PFObject from PFObject array

Question

I m trying to create a function that could remove items such as following:

var array = [23,36,12,45,52,63]
removeItem(12,array)
result : array = [23,36,45,52,63]

I m trying to implement this for PFObject but I m getting error:

public func removeObjectFromArray(user:PFObject,array:[PFObject]) -> [PFObject]{

    for var i = 0;i < array.count ; i++ {
        if array[i].objectId == user.objectId{
            array.removeAtIndex(i)
            return array
        }
    }
}

The error that I m getting:

Immutable type of [PFObject] only ha mutating members named 'removeAtIndex'

Any solution for this?

Thank you

NSMutableArray provides this https://developer.apple.com/library/mac/documentation/Cocoa/Reference/Foundation/Classes/NSMutableArray_Class/#//apple_ref/occ/instm/NSMutableArray/removeObjectsInArray: — danh, Aug 26 '15 at 15:54

score 0 · Answer 1 · edited May 23 '17 at 12:14

0

Try doing this:

public func removeObjectFromArray(user: PFObject, array: [PFObject]) -> [PFObject] {
    var a = array
    for i in 0..<a.count {
        if a[i].objectId == user.objectId {
            a.removeAtIndex(i)
            return a
        }
    }
    return a
}

The problem is that you try to modify function argument.

You can also make function parameter mutable by adding var keyword, here is related question: Swift make method parameter mutable?

edited May 23 '17 at 12:14

Community

1
1

answered Aug 26 '15 at 15:35

egor.zhdan

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This will lead to sadness, since the end index changes while the loop is running. – danh Aug 26 '15 at 15:55
@danh is works well since I'm not going on next iteration after removing the object. – egor.zhdan Aug 26 '15 at 15:59

score 0 · Answer 2 · answered Aug 26 '15 at 15:42

I'm not a swift developer, but I never like to remove objects in a loop. Here's how I would do it (pseudo code):

var a = empty array
for i in (0 -> length of array) {
    if array[i].objectId != user.objectId {
        a.addObject(array[i])
    }
}
return a

Remove specific PFObject from PFObject array

2 Answers2