Scala Appending to an empty Array -

i trying append array reason appending blanks array.

  def schemaclean(x: array[string]): array[string] =   {     val array = array[string]()     for(i <- 0 until x.length){       val convert = x(i).tostring       val split = convert.split('|')       if (split.length == 5) {         val drop = split.dropright(3).mkstring(" ")         array :+ drop       }       else if (split.length == 4) {         val drop = split.dropright(2).mkstring(" ")         println(drop)         array :+ drop.tostring         println(array.mkstring(" "))       }     }    array   }     val schema1 = schemaclean(schema) 

prints this:

record_id string  assigned_offer_id string  accepted_offer_flag string  current_offer_flag string 

if try , print schema1 1 blank line.

scala's array size immutable. scala's reference:

def     :+(elem: a): array[a]  

[use case] copy of array element appended.

thus :+ returns new array reference not using.

val array = ... 

should be:

var array = ... 

and should update reference new arrays obtained after each append operation.

since there not variable size arrays in scala, alternative array var copied after insertion bufferarray, use method operator += append new elements , obtain resulting array buffer, e.g:

import scala.collection.mutable.arraybuffer val ab = arraybuffer[string]() ab += "hello" ab += "world" ab.toarray 

res2: array[string] = array(hello, world)

applied code:

def schemaclean(x: array[string]): array[string] =   {     val arraybuf = arraybuffer[string]()     for(i <- 0 until x.length){       val convert = x(i).tostring       val split = convert.split('|')       if (split.length == 5) {         val drop = split.dropright(3).mkstring(" ")         arraybuf += drop       }       else if (split.length == 4) {         val drop = split.dropright(2).mkstring(" ")         println(drop)         arraybuf += drop.tostring         println(arraybuf.toarray.mkstring(" "))       }     }    arraybuf.toarray   }