scala 将不可变映射的内容复制到新的可变映射
声明:本页面是StackOverFlow热门问题的中英对照翻译,遵循CC BY-SA 4.0协议,如果您需要使用它,必须同样遵循CC BY-SA许可,注明原文地址和作者信息,同时你必须将它归于原作者(不是我):StackOverFlow
原文地址: http://stackoverflow.com/questions/9049117/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
提示:将鼠标放在中文语句上可以显示对应的英文。显示中英文
时间:2020-10-22 03:50:08 来源:igfitidea点击:
copy contents of immutable map to new mutable map
提问by dave
Possible Duplicate:
How can I convert immutable.Map to mutable.Map in Scala?
How do I create a new mutable map with the contents of the immutable map in Scala?
如何使用 Scala 中不可变映射的内容创建新的可变映射?
So far I have tried:
到目前为止,我已经尝试过:
val m:scala.collection.mutable.Map[Int, Double] = scala.collection.mutable.Map[Int, Double](imm.map({case(key, value) => (key -> value) }))
to no avail.
无济于事。
回答by Rex Kerr
val im = Map(1->1.0, 2->3.0)
val mm = collection.mutable.Map[Int,Double]() ++= im
回答by Blaisorblade
val immM = Map(1 -> 2)
val mutM = collection.mutable.Map(immM.toSeq: _*)

