I am learning Kotlin and it is looking likely I may want to use it as my primary language within the next year. However, I keep getting conflicting research that Kotlin does or does not have immutable collections and I'm trying to figure out if I need to use Google Guava.
有人能给我一些指导吗？它默认使用不可变集合吗？哪些运算符返回可变或不可变集合？如果没有，是否有实施计划？
标准库中的Kotlin的List是只读的:
interface List<out E> : Collection<E> (source)
A generic ordered collection of elements. Methods in this interface support only read-only access to the list; read/write access is supported through the MutableList interface.
Parameters
正如前面提到的，还有MutableList
interface MutableList<E> : List<E>, MutableCollection<E> (source)
支持添加和的元素的通用有序集合 正在删除元素.
Parameters
Due to this, Kotlin enforces readonly behaviour through its interfaces, instead of throwing Exceptions on runtime like default Java implementations do.
同样，还有MutableCollection、MutableIterable、MutableIterator、MutableListIterator、MutableMap和MutableSet，请参见stdlib文档.