Just a quick note today that if you want to create a mutable Scala array — particularly an array that can grow in size after you first declare it — you need to use the Scala
ArrayBuffer class instead of the
Array class, which can’t grow.
Here’s a short example that shows how to instantiate an
ArrayBuffer object, then add elements to it:
import scala.collection.mutable.ArrayBuffer var fruits = ArrayBuffer[String]() fruits += "Apple" fruits += "Banana" fruits += "Orange"
Once you have an
ArrayBuffer object, you can generally use it like an
Array, getting elements like this:
getting the array length like this:
and so on. You can also cast an
ArrayBuffer to an
Array using its
Again, the only trick here is knowing that you can’t add elements to a Scala
Array, and therefore, if you want to create an array that can be resized, you need to use the
ArrayBuffer class instead.