If I have an immutableMap: Map<String, Int> and want to convert it to a mutableMap: MutableMap<String, Int>, what would be the best way to do that? There doesn't seem like any convenient way.
If I have an immutableMap: Map<String, Int> and want to convert it to a mutableMap: MutableMap<String, Int>, what would be the best way to do that? There doesn't seem like any convenient way.
Update: The Kotlin 1.1 stdlib has a .toMutableMap() function. This should be used instead of creating your own.
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下面的扩展函数通过将Map复制到MutableMap来工作.
fun <K, V> Map<K, V>.toMutableMap(): MutableMap<K, V> {
return HashMap(this)
}
其他一些答案建议判断 map 是否为MutableMap，然后再 Select 是否为MutableMap.这应该不惜一切代价避免，因为这是一种不好的做法.事实上，在Kotlin ，它被降到了Map，这意味着这个Map不应该被改变，这样做是危险的.