How to parse a string data from array inside JSON another array in Swift 4

Question

I have to show string data into a tableView.

{
"success": [
    [
        "An Ad with order id 2563 at location DLF, Delhi has been approved | 20 hours before|Shashank Tiwari"
    ],
    [
        "An Ad with order id 2539 at location V3S Mall has been approved | 1 week before|Shashank Tiwari"
    ],
    [
        "An Ad with order id 2515 at location Pacific Mall has been approved | 1 week before|Shashank Tiwari"
    ],
    [
        "An Ad with order id 2500 at location Ambience Mall has been rejected | 1 week before|Shashank Tiwari"
    ],
    [
        "An Ad with order id 2499 at location Vience Mall has been approved | 1 week before|Shashank Tiwari"
    ],
    [
        "An Ad with order id 2480 at location DLF, Delhi has been approved | 2 weeks before|Shashank Tiwari"
    ]
}

So I am parsing data as like below but not able to append data in to arrData Array.

           let json = try JSON(data:data
           let result = json["success"]                                           

                 print(result)


                    for arr in result.arrayValue {

                        self.arrData.compactMap{ $0 as? NSArray}
            }

Are you trying to append data by calling compactMap? what is arrData? — Rob C
– Rob C, Commented Apr 30, 2020 at 10:07

vadian · Accepted Answer · 2020-04-30 10:41:05Z

1

If you want to flatten the array then compactMap is the wrong API.

Use reduce

let result = json["success"]
let array = (result.arrayObject as! [[String]]).reduce([], +)
self.arrData.append(contentsOf: array)

arrayObject returns [Any]?, you have to downcast it to the real type [[String]]
reduce transforms the two-dimensional array to an one-dimensional array.

edited Apr 30, 2020 at 10:41

answered Apr 30, 2020 at 10:23

vadian

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2 Comments

saumya ranjan Gangwar Over a year ago

Thanks Vadian, its working fantastic for me. Can you please elaborate it ??

saumya ranjan Gangwar Over a year ago

(result.arrayObject as! [[String]]).reduce([], +)

Rohit Makwana · Accepted Answer · 2020-04-30 11:07:47Z

0

You can to it with another way like

let result = json["success"]
if let arr = result.arrayObject as? [[String]] {
    let array = arr.map { $0.first! }
    self.arrData.append(contentsOf: array)
}

answered Apr 30, 2020 at 11:07

Rohit Makwana

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