用静态编程语言定义多嵌套/层次映射的更简单方法

Question

目前，如果我必须定义一个嵌套的/分层的Map类似于Map

PS：静态编程语言新手

JavaScript示例（假设示例）。

var schema = {
    "US": {
        "WA": {
            "Seattle": "Pike Street"
        }
    },
    "IN" : {
        "Karnataka": {
            "Bangalore" : "MG Road"
        }
    }
};

静态编程语言：

val WA_CITY_TO_ST_MAP = mapOf(
    "Seattle" to "",
    "Redmond" to "1st Ave"
)
val KARNATAKA_CITY_TO_ST_MAP = mapOf("Bangalore" to "MG Road")

val US_STATE_TO_CITIES_MAP = mapOf("WA" to WA_CITY_TO_ST_MAP)
val IN_STATES_TO_CITIES_MAP = mapOf("Karnataka" to KARNATAKA_CITY_TO_ST_MAP)

val schema = mapOf("US" to US_STATE_TO_CITIES_MAP, "IN" to IN_STATES_TO_CITIES_MAP)




Answer 1

嵌套映射可以内联构建，无需将它们初始化为单独的vals：

val schema = mapOf(
            "US" to mapOf(
                    "WA" to mapOf(
                            "Seattle" to "",
                            "Redmond" to "1st Ave"
                    )
            ),
            "IN" to mapOf(
                    "Karnataka" to mapOf(
                            "Bangalore" to "MG Road"
                    )
            )
    )

如果您的结构并不总是具有相同的嵌套级别（很像JSON），那么您可能需要考虑使用适当的JSON库来处理数据。