Scala what is the best way to append an element to an Array

Question

Say I have an Array Int  like  val array   Array  1  2  3     Now I would like to append an element to the array  say the value 4  as in the following example    val array2   array   4        will not compile   I can of course use System arraycopy   and do this on my own  but there must be a Scala library function for this  which I simply could not find  Thanks for any pointers   Notes    I am aware that I can append another Array of elements  like in the following line  but that seems too round-about   val array2b   array    Array  4          this works  I am aware of the advantages and drawbacks of List vs Array and here I am for various reasons specifically interested in extending an Array     Edit 1  Thanks for the answers pointing to the    operator method  This is what I was looking for  Unfortunately  it is rather slower than a custom append   method implementation using arraycopy -- about two to three times slower  Looking at the implementation in SeqLike    a builder is created  then the array is added to it  then the append is done via the builder  then the builder is rendered  Not a good implementation for arrays  I did a quick benchmark comparing the two methods  looking at the fastest time out of ten cycles  Doing 10 million repetitions of a single-item append to an 8-element array instance of some class Foo takes 3 1 sec with    and 1 7 sec with a simple append   method that uses System arraycopy    doing 10 million single-item append repetitions on 8-element arrays of Long takes 2 1 sec with    and 0 78 sec with the simple append   method  Wonder if this couldn t be fixed in the library with a custom implementation for Array   Edit 2  For what it s worth  I filed a ticket  https   issues scala-lang org browse SI-5017

User · Answer

val array2   array    4   Array 1  2  3  4    Works also  reversed    val array2   4    array Array 4  1  2  3    There is also an  in-place  version   var array   Array  1  2  3   array     4   Array 4  1  2  3  array     0   Array 4  1  2  3  0

User · Answer

You can use    to append element to array and    to prepend it   0    array    4   should produce   res3  Array Int    Array 0  1  2  3  4    It s the same as with any other implementation of Seq

User · Answer

The easiest might be   Array 1  2  3     4   Actually  Array can be implcitly transformed in a WrappedArray

[arrays] Scala: what is the best way to append an element to an Array?

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