comparing of two arrows in swift 3

there is four arrays:

first id with pixel coordinates second with pixel colours third with searched colours in second (e.q. all picture contains only two colours ) fourth must contains colours and pixel coordinates, where coordinates collected on colour

I try to compare two arrays (#2 and #3) and if result is true add an member from the another array (#1) in the array #4

when code execute, it take me mistake with last compare operator (if (rgbAr == crD) {)

import Cocoa

class ViewController: NSViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
    }

    override var representedObject: Any? {
        didSet {
            // Update the view, if already loaded.
        }
    }

    @IBAction func passPix(_ sender: Any) {
        let fileURL = "/Users/IMac/Desktop/text.txt"
        var inString = ("Pix+Col")
        do {
            inString = try String(contentsOfFile: fileURL, encoding:String.Encoding.utf8)

        } catch let error as NSError {
            print("Failed reading from URL: \(fileURL), Error: " + error.localizedDescription)
        }



        var js = String(inString.characters.map { $0 == "(" ? "[" : $0 })
        js = String(js.characters.map { $0 == ")" ? "]" : $0 })

        let data = js.data(using: .utf8)
        let json = try! JSONSerialization.jsonObject(with: data!) as! [Any]

        let coords = json[0] as! [NSArray]
        let rgbs = json[1] as! [NSArray]

        var array = [Array<Double>] ()
        var newrgbs = [Array <Double>] ()
        var coords_1 = [Array <Double>] ()
        var separCol = [Array <Double>] ()

        let firstEl = rgbs [0]


        let FirstElem = [firstEl [0] as! Double, firstEl [1] as!Double, firstEl [2] as!Double]
        array.append (FirstElem)

        for itt in coords{
            let itemX = [itt[0] as! Double, itt [1] as!Double]
            coords_1.append(itemX)

        }

        for item in rgbs{
            let itemX = [item [0] as! Double, item [1] as!Double, item [2] as!Double]
            newrgbs.append(itemX)

            let result = array.filter { $0==itemX }

            if result.isEmpty {
                array.append(itemX)

            }

        }


        for rgbAr in array {
            var inteR = 0
            separCol.append (rgbAr)

            for crD in newrgbs{
                inteR += 1
                if (rgbAr == crD) {
                    separCol.append (coords_1 [25])
                }
            }

        }
        print (separCol)


    }
}