Scala: How to fill/populate a list (same element or different elements)

As a quick note, if you ever need to fill/populate a Scala list with the same element X number of times, one solution is to use the fill method that’s available to Scala sequences, like this:

scala> val x = List.fill(3)("foo")
x: List[String] = List(foo, foo, foo)

If you want to populate a list with different element values, another approach is to use the tabulate method:

scala> val x = List.tabulate(5)(n => n * n)
x: List[Int] = List(0, 1, 4, 9, 16)

More Scala List class information

For more information, see:

• My Five ways to create a Scala List tutorial
• My free Scala List class video tutorial