Scala nested arrays flattening -

how flatten array of nested arrays of depth ?

for instance

val in = array( 1, array(2,3), 4, array(array(5)) ) 

would flattened onto

val out = array(1,2,3,4,5) 

thanks in advance.

if have mixed int , array[int], not idea begin with, can like

in.flatmap{ case i: int => array(i); case ai: array[int] => ai } 

(it throw exception if you've put else in array). can use basis of recursive function:

def flatint(in: array[any]): array[int] = in.flatmap{   case i: int => array(i)   case ai: array[int] => ai   case x: array[_] => flatint(x.toarray[any]) } 

if don't know you've got in nested arrays, can replace above ints any , flat array[any] result. (edit: any case needs go last.)

(note: not tail-recursive, can overflow stack if arrays nested extremely deeply.)