Scala : append Array to List

Question

I'm trying to append Array to List When writing data into a csv file as follows.

But, each Array was not appended to the List. How can I append each Array to a List.

Please help me with this.

import java.io.StringWriter
import au.com.bytecode.opencsv.CSVWriter
import scala.collection.JavaConversions._
import java.io.FileWriter
import java.io.BufferedWriter

var out = new BufferedWriter(new FileWriter("/Users/TestCom/Desktop/test_4.csv"));
var writer = new CSVWriter(out);
var outputSchema = Array("name","0h","20h")
var listOfRecords = List(outputSchema)

var numIters = 0
for(numIters <- 0 to 1){

    var testVal1 = numIters + 1
    var testVal2 = numIters + 2

    var eachArr = Array(testVal1, testVal2)
    listOfRecords ++ eachArr
}

writer.writeAll(listOfRecords)
out.close()

nattyddubbs · Accepted Answer · 2017-12-05 13:43:19Z

1

Change your line that does listOfRecords ++ eachArr to be listOfRecords = listOfRecords ++ eachArr.

The list is immutable so you must reassign after appending.

answered Dec 5, 2017 at 13:43

nattyddubbs

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2 Comments

Seung-hee Han Over a year ago

Thank you so much. Additionally, "listOfRecords = listOfRecords ++ eachArr" made a mismatch error. So, I changed the code to "listOfRecords = listOfRecords ++ List(eachArr)"

nattyddubbs Over a year ago

Glad to help. Happy coding!

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