Scala: Printing the ouput in proper data format using scala - scala

Question

I would like to display the data in proper format, I have the below code
val maplist=List(Map("id" -> "1", "Name" -> "divya"),
Map("id" -> "2", "Name" -> "gaya")
)
val header=maplist.flatMap(_.keys).distinct
val data=maplist.map(_.values)
println(header.mkString(" "))
data.foreach(x => println(x.mkString(" ")))
this is showing as
id Name
1 divya
2 gaya
but I would like to show like, I may have to use df.show() function
+----+-----+
|Id |Name |
+----+-----+
|1 |Divya|
|2 |gaya |
+----+-----+

Answer 1

If you want the separators you should use mkString method with more parameters, you can check in the API
mkString(start: String, sep: String, end: String): String
Displays all elements of this traversable or iterator in a string
using start, end, and separator strings.
val separatorLine = "+----+-----+"
val separator = "|"
val maplist=List(Map("id" -> "1", "Name" -> "divya"),
Map("id" -> "2", "Name" -> "gaya")
)
val header=maplist.flatMap(_.keys).distinct
val data=maplist.map(_.values)
println(separatorLine)
println(header.mkString("|", " |", "|"))
println(separatorLine)
data.foreach(x => println(x.mkString("|", " |", "|")))
println(separatorLine)
Result:
+----+-----+
|id |Name|
+----+-----+
|1 |divya|
|2 |gaya|
+----+-----+
Update: If you want to have the same length in every String (for instance 5) you can do an auxiliar method yo append blanks when needed:
#tailrec
private def appendElem(original : String, desiredLength: Int, c: Char): String = {
if (original.length < desiredLength)
appendElem(original + c, desiredLength, c)
else {
original
}
}
val separator = "|"
val maplist=List(Map("id" -> "1", "Name" -> "divya"),
Map("id" -> "2", "Name" -> "gaya")
)
val separatorLine = List.fill(maplist.size)( "+").map(appendElem(_, 6,'-')).mkString+ "+"
val header=maplist.flatMap(_.keys.map(key => appendElem(key, 5, ' '))).distinct
val data=maplist.map(_.values)
println(separatorLine)
println(header.mkString("|", "|", "|"))
println(separatorLine)
data.map(x => x.map(y => appendElem(y, 5, ' '))).foreach(x => println(x.mkString("|", "|", "|")))
println(separatorLine)
With this second version the result is as follows
+-----+-----+
|id |Name |
+-----+-----+
|1 |divya|
|2 |gaya |
+-----+-----+