How can I convert an ArrayBuffer of Maps(String,String) to an Array of Maps(String, String) in Scala using toArray()?
ArrayBuffer(Map("x1" -> "x", "y1" -> "y"), Map("x2" -> "x", "y2" -> "y"))
to
Array(Map("x1" -> "x", "y1" -> "y"), Map("x2" -> "x", "y2" -> "y"))
ArrayBuffer is mutable data sturcture. you can call .toArray to convert it to immutable Array
scala> import scala.collection.mutable.ArrayBuffer
import scala.collection.mutable.ArrayBuffer
scala> ArrayBuffer(Map("x1" -> "x", "y1" -> "y"), Map("x2" -> "x", "y2" -> "y"))
res1: scala.collection.mutable.ArrayBuffer[scala.collection.immutable.Map[String,String]] = ArrayBuffer(Map(x1 -> x, y1 -> y), Map(x2 -> x, y2 -> y))
now call .toArray,
scala> res1.toArray
res2: Array[scala.collection.immutable.Map[String,String]] = Array(Map(x1 -> x, y1 -> y), Map(x2 -> x, y2 -> y))
See the definition for toArray which returns Array[B],
scala> res1.toArray
def toArray[B >: scala.collection.immutable.Map[String,String]](implicit evidence$1: scala.reflect.ClassTag[B]): Array[B]
toArray does not always work e.g. "Error not enough arguments for toArray. Unspecified value parameter evidence$2".If you want Scala's immutable Array and immutable Map then
import scala.collection.mutable.ArrayBuffer
ArrayBuffer(Map("x1" -> "x", "y1" -> "y"), Map("x2" -> "x", "y2" -> "y")).toArray
