Array 从哪里得到它的 toList 方法 [英] Where does Array get its toList method

问题描述

通过搜索，我了解将数组转换为列表的方式(或方式)如下:

Through searches, I understand the way (or, a way) to convert an Array to a List is like so:

val l = Array(1, 2, 3).toList

但我不仅在 Array 的 API 文档中找不到 toList 方法，而且在任何似乎是 Array 的祖先或继承特征的东西中也找不到它.

But not only can I not find the toList method in Array's API docs, I can't find it in anything that seems to be an ancestor or inherited trait of Array.

使用较新的 2.9 API 文档，我看到 toList 存在于这些东西中:

Using the newer 2.9 API docs, I see that toList exists in these things:

ImmutableMapAdaptor ImmutableSetAdaptor IntMap List ListBuffer LongMap 
MutableList Option ParIterableLike PriorityQueue Stack StackProxy 
StreamIterator SynchronizedSet SynchronizedStack TraversableForwarder 
TraversableOnce TraversableOnceMethods TraversableProxyLike

但我无法理解 toList 如何从其中之一获取成为 Array 的一部分.谁能解释一下?

But I can't understand how toList gets from one of these to be part of Array. Can anyone explain this?

推荐答案

toList 和在 Java 数组中原生找不到的类似方法(包括我们以前的最爱，map、flatMap、filter 等)来自scmArrayOps, 哪些数组通过 scala.Predef.寻找名称以 ArrayOps 结尾的隐式方法，你就会明白魔法的来源.

toList and similar methods not natively found on Java arrays (including our old favourites, map, flatMap, filter etc.) come from s.c.m.ArrayOps, which arrays acquire via implicit conversions in scala.Predef. Look for implicit methods whose names end with ArrayOps and you'll see where the magic comes from.

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