I have some records in a List . Now I want to create a new Map(Mutable Map) from that List with unique key for each record. I want to achieve this my reading a List and calling the higher order method called map in scala.
records.txt is my input file
100,Surender,2015-01-27
100,Surender,2015-01-30
101,Raja,2015-02-19
Expected Output :
Map(0-> 100,Surender,2015-01-27, 1 -> 100,Surender,2015-01-30,2 ->101,Raja,2015-02-19)
Scala Code :
object SampleObject{
def main(args:Array[String]) ={
val mutableMap = scala.collection.mutable.Map[Int,String]()
var i:Int =0
val myList=Source.fromFile("D:\\Scala_inputfiles\\records.txt").getLines().toList;
println(myList)
val resultList= myList.map { x =>
{
mutableMap(i) =x.toString()
i=i+1
}
}
println(mutableMap)
}
}
But I am getting output like below
Map(1 -> 101,Raja,2015-02-19)
I want to understand why it is keeping the last record alone . Could some one help me?
val mm: Map[Int, String] = Source.fromFile(filename).getLines
.zipWithIndex
.map({ case (line, i) => i -> line })(collection.breakOut)
Here the (collection.breakOut)
is to avoid the extra parse caused by toMap.
Consider
(for {
(line, i) <- Source.fromFile(filename).getLines.zipWithIndex
} yield i -> line).toMap
where we read each line, associate an index value starting from zero and create a map out of each association.
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