How to convert, in Scala, an Array[VertexIds] to a Map?

Question

In Scala, I have a an array of VertexIds

v: Array[org.apache.spark.graphx.VertexId] = Array(-2634311911308936962, 2326575714372975825, ...)

that i want to convert to a map where

Map(-2634311911308936962 -> 0,
    2326575714372975825  -> 1,
    ...
)

What is the most efficient way of doing this?

Answer 1

v.zipWithIndex.toMap

won't be sorted though