如何在scala中解压list（list（））[重复]

【问题标题】：how to unpack list(list()) in scala [duplicate]如何在scala中解压list（list（））[重复]
【发布时间】：2019-07-05 20:27:52
【问题描述】：

嗨，我是 scala 的初学者，我要解压

List(List("hello=10","hi=21","there=13","bro=44","family=44","technology=35","hi=20","hello=100","hi=21","there=13","bro=44","family=44","technology=35","hi=21","there=13","bro=44","family=44","family=44"))

变成类似

List("hello=10","hi=21","there=13","bro=44","family=44","technology=35","hi=20","hello=100","hi=21","there=13","bro=44","family=44","technology=35","hi=21","there=13","bro=44","family=44","family=44")

我们怎样才能实现？

谢谢！

【问题讨论】：

使用flatten方法

标签： scala nested-lists flatten

【解决方案1】：

您可以使用列表的内置方法flatten。

scala> val list = List(List("hello=10","hi=21","there=13","bro=44","family=44","technology=35","hi=20","hello=100","hi=21","there=13","bro=44","family=44","technology=35","hi=21","there=13","bro=44","family=44","family=44"))
list: List[List[String]] = List(List(hello=10, hi=21, there=13, bro=44, family=44, technology=35, hi=20, hello=100, hi=21, there=13, bro=44, family=44, technology=35, hi=21, there=13, bro=44, family=44, family=44))

scala> list.flatten
res0: List[String] = List(hello=10, hi=21, there=13, bro=44, family=44, technology=35, hi=20, hello=100, hi=21, there=13, bro=44, family=44, technology=35, hi=21, there=13, bro=44, family=44, family=44)

【讨论】：