How to efficient copy an Array to another in Scala?

Question

How I can use another way to copy a Array to another Array?

My thought is to use the = operator. For example:

Answer 1

Another option is to create the new array, B, using A as a variable argument sequence:

val B = Array(A: _*)

The important thing to note is that using the equal operator, C = A, results in C pointing to the original array, A. That means changing C will change A:

scala> val A = Array(1, 2, 3, 4)
A: Array[Int] = Array(1, 2, 3, 4)

scala> val B = Array(A: _*)
B: Array[Int] = Array(1, 2, 3, 4)

scala> val C = A
C: Array[Int] = Array(1, 2, 3, 4)

scala> B(0) = 9

scala> A
res1: Array[Int] = Array(1, 2, 3, 4)

scala> B
res2: Array[Int] = Array(9, 2, 3, 4)

scala> C(0) = 8

scala> C
res4: Array[Int] = Array(8, 2, 3, 4)

scala> A
res5: Array[Int] = Array(8, 2, 3, 4)