Convert string to Tuple in Scala

Question

I have to read data from file and convert it to a Tuple. Sample data is

(List(-28.92706839930671, 70.0055196968918, 97.18634024152067, -0.8977639173269137, -20.95631222378548),List(-2.1642508141664965, -49.26719368168469, -77.6449011447281, -92.11164347698504, 39.31785782242422),8.387308243500957E10,0.95,0.1)

I am using following code to read data from file.

val dataSource = Source.fromFile("/path/3.txt")
val lines = dataSource.getLines()
for (line <- lines) {
  line 
}

How can I convert string line to Tuple of ( List[Double] , List[Double] , Double , Double , Double ) ?

jrook · Accepted Answer · 2020-10-19 17:04:09Z

1

If the structure of your input is exactly like the sample in the question with no possibility of invalid input, one solution is to use the following in the for loop:

val ls = line.replaceAll("\\(", "")
  .replaceAll("\\)","")
  .replaceAll("List", "")
  .split(",")
(ls.slice(0,5).map(_.toDouble).toList, ls.slice(5,10).map(_.toDouble).toList,
  ls(10).toDouble, ls(11).toDouble, ls(12).toDouble)

Result:

(List[Double], List[Double], Double, Double, Double) = (List(-28.92706839930671, 70.0055196968918, 97.18634024152067, -0.8977639173269137, -20.95631222378548),List(-2.1642508141664965, -49.26719368168469, -77.6449011447281, -92.11164347698504, 39.31785782242422),8.387308243500957E10,0.95,0.1)

edited Oct 19, 2020 at 17:04

answered Oct 19, 2020 at 16:38

jrook

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7 Comments

Asif Over a year ago

line contains List[Double] , List[Double] , Double , Double , Double. Yours code is throwing error.

jrook Over a year ago

So you want to filter out the Lists and the parens out of the string then?

Asif Over a year ago

Yes exactly. I need this in such a way let store result of converting string to tuple in result object. result._1 and result._2 should return List[Double], result._3,result._4,result._5 should return Double

jrook Over a year ago

@Asif , Please check the edit. It doesn't throw an error on my side btw. The idea is to just to get a list of numbers and then split and slice that list

Asif Over a year ago

Thanks a lot. It's working now. One more thing. Currently length of both lists is 5. What if length of lists increases? In each case length of both lists will remain same.

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