scala comma separated string to double-quoted comma separated string

Question

I have a file which contains certain string like -

Apple
Google
Microsoft

I am reading in this file as

val lines = scala.io.Source.fromFile(filePath).mkString.replace("\n", ",")

Which results in a comma separated list of string. However what I really want is "Apple","Google","Microsoft"

If I add double quotes in the string replace while reading in the file I while have to take care of the first and last double quotes which won't be ideal. How should I go about this?

jwvh · Accepted Answer · 2020-02-21 00:13:51Z

3

One option is to load each line into an Iterator and then let mkString apply the commas and quote marks.

io.Source
  .fromFile(filePath)
  .getLines()
  .mkString("\"","\",\"","\"")
//res0: String = "Apple","Google","Microsoft"

answered Feb 21, 2020 at 0:13

jwvh

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2 Comments

newbie Over a year ago

The output for me is now looking like - "A","p","p","l","e".......

jwvh Over a year ago

Are you using .getLines (and only .getLines) to read from the file?

Mario Galic · Accepted Answer · 2020-02-21 00:19:23Z

1

Similar to jwvh's answer but with Using for resource management

import scala.util.Using
import scala.io.Source

Using.resource(Source.fromFile(filePath)) { file =>
  file.getLines.map(line => s""""$line"""").mkString(",")
}

answered Feb 21, 2020 at 0:19

Mario Galic

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