(Swift 3,4,5...) Create more Complex JSON Document

Sample code to create the following JSON document:

    {  
        "Title": "The Cuckoo's Calling",  
        "Author": "Robert Galbraith",  
        "Genre": "classic crime novel",  
        "Detail": {  
            "Publisher": "Little Brown",  
            "Publication_Year": 2013,  
            "ISBN-13": 9781408704004,  
            "Language": "English",  
            "Pages": 494  
        },  
        "Price": [  
            {  
                "type": "Hardcover",  
                "price": 16.65  
            },  
            {  
                "type": "Kindle Edition",  
                "price": 7.00  
            }  
        ]  
    }  

Chilkat Downloads for the Swift Programming Language MAC OS X (Cocoa) Objective-C/Swift Libs iOS Objective-C/Swift Libs

func chilkatTest() {
    let json = CkoJsonObject()!

    var success: Bool

    // The only reason for failure in the following lines of code would be an out-of-memory condition..

    // An index value of -1 is used to append at the end.
    var index: Int = -1

    success = json.addString(at: -1, name: "Title", value: "The Cuckoo's Calling")
    success = json.addString(at: -1, name: "Author", value: "Robert Galbraith")
    success = json.addString(at: -1, name: "Genre", value: "classic crime novel")

    // Let's create the Detail JSON object:
    success = json.add(at: -1, name: "Detail")
    var detail: CkoJsonObject? = json.object(at: json.size.intValue - 1)
    success = detail!.addString(at: -1, name: "Publisher", value: "Little Brown")
    success = detail!.addInt(at: -1, name: "Publication_Year", value: 2013)
    success = detail!.addNumber(at: -1, name: "ISBN-13", numericStr: "9781408704004")
    success = detail!.addString(at: -1, name: "Language", value: "English")
    success = detail!.addInt(at: -1, name: "Pages", value: 494)
    detail = nil

    // Add the array for Price
    success = json.add(at: -1, name: "Price")
    var aPrice: CkoJsonArray? = json.array(at: json.size.intValue - 1)

    // Entry entry in aPrice will be a JSON object.

    // Append a new/empty ojbect to the end of the aPrice array.
    success = aPrice!.addObject(at: -1)
    // Get the object that was just appended.
    var priceObj: CkoJsonObject? = aPrice!.object(at: aPrice!.size.intValue - 1)
    success = priceObj!.addString(at: -1, name: "type", value: "Hardcover")
    success = priceObj!.addNumber(at: -1, name: "price", numericStr: "16.65")
    priceObj = nil

    success = aPrice!.addObject(at: -1)
    priceObj = aPrice!.object(at: aPrice!.size.intValue - 1)
    success = priceObj!.addString(at: -1, name: "type", value: "Kindle Edition")
    success = priceObj!.addNumber(at: -1, name: "price", numericStr: "7.00")
    priceObj = nil

    aPrice = nil

    json.emitCompact = false
    print("\(json.emit()!)")

}