(Swift 3,4,5...) Emit JSON Array to StringBuilder

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Demonstrates how to write a JSON array to a Chilkat StringBuilder object.

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func chilkatTest() {
    let a = CkoJsonArray()!
    var success: Bool = a.load("[ 1,2,3,4 ]")

    // We could get the JSON array as a string...
    var s: String? = a.emit()
    print("\(s!)")

    // But what if the JSON array contains a huge amount of data,
    // and we don't want to marshal it all from Chilkat's internal
    // native code to a string in our programming language?

    // You can instead emit to a Chilkat StringBuilder
    let sb = CkoStringBuilder()!
    a.emitSb(sb)

    // Perhaps the StringBuilder object can be passed to other methods..
    // Chilkat typically provides methods where a potentially large string
    // can be passed in via a StringBuilder object..

    // Or perhaps you wish to save to a file..
    success = sb.writeFile("c:/temp/qa_output/a.json", charset: "utf-8", emitBom: false)

}