scala 空列表

Flattening of List is converting a list of multiple List into a single List. To flatten List of List in Scala we will use the flatten method.

扁平化列表是將多個列表的列表轉換為單個列表。 為了在Scala中扁平化List列表，我們將使用flatten方法。

Syntax:

句法：

val newList = list.flatten

Program to flatten a list of list with numerical values

程序用數值拼合列表列表

object MyClass {def main(args: Array[String]) {val ListofList = List(List(214, 56), List(6, 12, 34, 98))println("List of List: " + ListofList)println("Flattening List of List ")val list = ListofList.flattenprintln("Flattened List: " + list)} }

Output

輸出量

List of List: List(List(214, 56), List(6, 12, 34, 98)) Flattening List of List Flattened List: List(214, 56, 6, 12, 34, 98)

The same flatten method can also be applied to convert sequence of sequence to a single sequence(Array, list, Vector, etc.).

同樣的展平方法也可以應用于將序列序列轉換為單個序列( 數組 ，列表，向量等)。

You can convert list of lists to list of type strings in two ways.

您可以通過兩種方式將列表列表轉換為類型字符串列表 。

Let's explore how to?

讓我們探索如何？

Program:

程序：

object MyClass {def main(args: Array[String]) {val ListofList = List(List("Include", "Help"), List("Programming", "Tutorial"))println("List of List: " + ListofList)println("Flattening List of List ")val list = ListofList.flattenprintln("Flattened List: " + list)} }

Output

輸出量

List of List: List(List(Include, Help), List(Programming, Tutorial)) Flattening List of List Flattened List: List(Include, Help, Programming, Tutorial)

Another way could split the list of list into character lists.

另一種方法可以將列表列表拆分為字符列表。

Program:

程序：

object MyClass {def main(args: Array[String]) {val ListofList = List("Include", "Help")println("List of List: " + ListofList)println("Flattening List of List ")val list = ListofList.flattenprintln("Flattened List: " + list)} }

Output

輸出量

List of List: List(Include, Help) Flattening List of List Flattened List: List(I, n, c, l, u, d, e, H, e, l, p)

翻譯自: https://www.includehelp.com/scala/how-to-flatten-a-list-of-list-in-scala.aspx

scala 空列表

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