Multidimensional '3D' Matrix in Kotlin

Issue

What will be the syntax of creating a 3D matrix in Kotlin. It's Java equivalent is as follows:

public static final int[][][] data = {{{0,0},{0}},{{0,1},{0}},{{1,0},{0}},{{1,1},{1}}};

Thanks

Edit: Also how can I print the Kotlin code using the simple println?

Solution

Kotlin currently does not support array literals.

You can use a combination of arrayOf() and intArrayOf():

val data = arrayOf(
  arrayOf(intArrayOf(0, 0), intArrayOf(0)),
  arrayOf(intArrayOf(0, 1), intArrayOf(0)),
  arrayOf(intArrayOf(1, 0), intArrayOf(0)),
  arrayOf(intArrayOf(1, 1), intArrayOf(1))
)

You can cut down a little bit on the verbosity using import aliasing if needed:

import kotlin.arrayOf as arr
import kotlin.intArrayOf as iarr

val data = arr(
  arr(iarr(0, 0), iarr(0)),
  arr(iarr(0, 1), iarr(0)),
  arr(iarr(1, 0), iarr(0)),
  arr(iarr(1, 1), iarr(1))
)

Also note that you can auto-convert Java code to Kotlin

• in IntelliJ IDEA: copy Java code into a Kotlin file, a confirmation prompt will open.
• online: using http://try.kotlinlang.org.

Answered By - F. George