How to replace a value in immutable arrays scala

Question

I have an array

val doot = Array("a", "b", "c")

I want to replace the 2nd index with the letter "z", but I do not want to modify doot. I want to create a new array, as that seems to be the idiom in scala.

So far, I can only modify the array with update

doot.update(1, "z") // But now doot is modified directly, not ideal!

Does scala offer a way to do this?

To be clear on language: you can't "replace" a value in an immutable array since it's immutable. i.e. cannot change. — Kevin Meredith
– Kevin Meredith, Commented Jul 11, 2016 at 2:52
To be further clear on language: There is no such thing as an "immutable array" in scala. There is only one Array, and it is mutable. — Chris Martin
– Chris Martin, Commented Jul 11, 2016 at 3:03
Well, that's good to know! My wording was off yeah, the point was that I cannot replace a value in an immutable array.. I wanted to create a new array with that value replaced. — MintyAnt
– MintyAnt, Commented Jul 11, 2016 at 3:38

Eastsun · Accepted Answer · 2016-07-11 02:26:16Z

7

scala> val doot = Array("a", "b", "c")
doot: Array[String] = Array(a, b, c)

scala> val eoot = doot.updated(1, "z")
eoot: Array[String] = Array(a, z, c)

scala> doot
res0: Array[String] = Array(a, b, c)

scala> eoot
res1: Array[String] = Array(a, z, c)

answered Jul 11, 2016 at 2:26

Eastsun

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