在scala列表中添加元素 [英] add elements in scala lists

问题描述

我仍在学习Scala，并且面临以下问题.目前，我在输入

I am still learning Scala and I am facing the following issue. Currently I have the following list in input

val listA=List("banana,africa,1,0",
"apple,europe,1,2",
"peas,africa,1,4")

所需的输出是:

val listB=list("banana,africa,1,0,1",
"apple,europe,1,2,3",
"peas,africa,1,4,5")

我的目的是为列表中的每一行添加一个与最后两个元素之和相对应的元素.我写了以下基本功能

My aim is to add an element corresponding to the sum of the two last elements for each line in the list. I wrote the following basic function

 def addSum(listin:List[String]):List[String]= {
  listin.map(_.split(",")).map(d => d + "," + d(2)+d(3))

}

这没有任何建议，因为请使用更好的方法进行操作

this is not working any suggestion aboit a better way to do it please

非常感谢

推荐答案

简单的解决方案是执行以下操作

Simple solution is to do something like below

listA.map(str => str.split(",")).map(arr => (arr ++ Array(arr(2).toInt+arr(3).toInt)).mkString(","))

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