Extract Map<String, Object> from enum with key-value attributes in one line?

Question

I have a general enum implementation with traditional key-value attributes:

enum class FooEnum(val key : String, val value : Any) {
    FOO1("FOO_KEY", "FOO_VALUE"),
    FOO2("FOO_KEY2", 0);

    companion object {
        fun getKeyValuesMap(): Map<String, Any> {
            val defaults = HashMap<String, Any>()

            for (v in values())
                defaults[v.key] = v.value

            return defaults
        }
    }
}

Is there a better "Kotlin" way to achieve the same result of getKeyValuesMap() ?

JB Nizet · Accepted Answer · 2018-06-28 21:05:13Z

4

fun getKeyValuesMap() = FooEnum.values().associate { it.key to it.value }

answered Jun 28, 2018 at 21:05

JB Nizet

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2 Comments

Ian Medeiros Over a year ago

I did a mixup of both answers: val map = FooEnum.values().associate { it.key to it.value }

Alexey Romanov Over a year ago

Yes, that's better than my answer.

Alexey Romanov · Accepted Answer · 2018-06-28 21:02:45Z

0

mapOf(*values().map { foo -> foo.key to foo.value }.toTypedArray())

I'd consider using a val instead of fun, the drawback is that someone could in theory cast the result to MutableMap or HashMap and mutate it.

answered Jun 28, 2018 at 21:02

Alexey Romanov

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