Change values in a multidimension Scala array

Question

I'm pretty new in Scala and trying to change the values in a multi dimension Array in the Scala way if there is such thing :)

Let's see the problem:

val table = Array.fill(5, 5){1}

and I'm trying to change every 1 to 5

for (i <- 0 until table.length) {
  for (j <- 0 until table(i).length) {
    table(i)(j) = 5
  }
}

But I think there will be some other (more functional way) to do the same thing.

Thank you!

I'm a bit confused why you had to initialize table to have 1s. — jtitusj
– jtitusj, Commented Mar 18, 2016 at 12:13

Reactormonk · Accepted Answer · 2016-03-18 11:44:14Z

6

val table = List.fill(5, 5){1}
val all5 = table.map(_.map(_ => 5))

answered Mar 18, 2016 at 11:44

Reactormonk

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4 Comments

The Archetypal Paul Over a year ago

That produces a copy of the table with all 5s, rather than changing the original. That may or may not be what the OP wanted.

Reactormonk Over a year ago

OP said functional, which is easier to reason about when it's immutable.

The Archetypal Paul Over a year ago

As I said, may or may not be what he wants. Let's see.

hcpeter Over a year ago

Thank you, it's perfectly fine for me. I think it's nicer to create a new table and don't change the input parameter. Clearly I have to learn more scala because it looks weird for my Java-trained eyes :)

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