如何通过解析 CSV 文件来创建 Map[K, V] 和 Seq[A]？

Question

I very new to scala, i want to create Scala Map() and Scala Seq() by parsing csv files.

Input1.csv
-------------
State,Capital,Filter,Unique
MH,Mumbai,1,Yes
KA,Bengaluru,0,Yes
AP,Hydrabad,1,No
TS,Hydrabad,1,No

from Input1.csv file i want scala.collection.Map[K, V]

Map("MH" -> "Mumbai", "KA" -> "Bengaluru", "AP" -> "Hydrabad", "TS" -> "Hydrabad")

Input2.csv
-----------
Columns_Names
State
Capital
Filter
Unique

from Input2.csv file i want scala.collection.Seq[A]

Seq("State", "Capital", "Filter", "Unique")

How this can be done in scala?

Answer 1

You can do it something like:

import scala.io.Source
import scala.util.{Failure, Success, Try}
val source = Source.fromFile("Input1.csv")
val cityMap = Try(source
  .getLines()
  .toSeq
  .tail
  .map {
    x =>
      x.split(",") match {
        case Array(code, capital, _, _) =>
          code -> capital
      }
  }.toMap) match {
  case Failure(exception) =>
    exception.printStackTrace()
    Map.empty[String, String]
  case Success(value) =>
    value
}
println(cityMap) // Map(MH -> Mumbai, KA -> Bengaluru, AP -> Hydrabad, TS -> Hydrabad)
source.close()