Dictionary嵌套下标

import DictionaryNestedSubscript

let dictionary: [String: Any] = [
    "countries": [
        "japan": [
            "capital": [
                "name": "tokyo",
                "lat": "35.6895",
                "lon": "139.6917"
            ],
            "language": "japanese"
        ]
    ]
]

dictionary[jsonDict: "countries"]?[jsonDict: "japan"]?[jsonDict: "capital"]?["name"] // "tokyo"