Swift - Ambiguous use of subscript sort() - Xcode 7.3

Question

I have updated my Xcode to version 7.3, which is compatible with iOS 9.3. My sort() method, which is let sortArr = saveDeals?.sort({ $1[2] as! String > $0[2] as! String});, is giving me an "ambiguous use of subscript" error. Please let me know what I can do to fix this error. Thank you!

func sortSaveDealsArr(saveDeals: [AnyObject]?) -> [AnyObject]
{
    let sortArr = saveDeals?.sort({ $1[2] as! String > $0[2] as! String});
    return sortArr!;
}

What is saveDeals? Everything depends on that.

matt
– matt

2016-03-28 03:05:55 +00:00
Commented Mar 28, 2016 at 3:05 — matt
– matt, Commented Mar 28, 2016 at 3:05

matt · Accepted Answer · 2016-03-28 03:05:32Z

2

The problem is that saveDeals is typed as a [AnyObject]?. Thus your $0 and $1 are each an AnyObject, and you can't subscript an AnyObject. You need to cast each of these things to something that is itself subscriptable. I don't know what's in your array so I can't say what that would be. Is saveDeals an array of arrays? If so, you need to cast saveDeals to that.

answered Mar 28, 2016 at 3:05

matt

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2 Comments

Arthur Liu Over a year ago

saveDeals is actually an array of arrays. Once I changed the code to

func sortSaveDealsArr(saveDeals: [[AnyObject]]?) -> [[AnyObject]]     {         let sortArr = saveDeals?.sort({ $1[2] as? String > $0[2] as? String});         return sortArr!;     }

, the error went away and worked as intended. Thanks :)

matt Over a year ago

Fantastic. Thanks for reporting back.

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