How to create a Three Dimensional List in Kotlin

How to create a Three Dimensional List in Kotlin ?

Answer

To create a three-dimensional list in Kotlin, you can use nested lists where each inner list represents a 2D plane within the 3D space.


✐ Examples

1 Create a 3D List of Integers

In this example,

  1. We initialize a 3D list using List>>, where each innermost list represents a row in the 2D plane.
  2. We use nested for loops to populate the 3D list with integers or perform operations on each element.

Kotlin Program

fun main() {
    val matrix3D = List(3) {
        List(3) {
            MutableList(3) { 0 }
        }
    }

    for (i in matrix3D.indices) {
        for (j in matrix3D[i].indices) {
            for (k in matrix3D[i][j].indices) {
                matrix3D[i][j][k] = i + j + k
            }
        }
    }

    println(matrix3D)
}

Output

[[[0, 1, 2], [1, 2, 3], [2, 3, 4]], [[1, 2, 3], [2, 3, 4], [3, 4, 5]], [[2, 3, 4], [3, 4, 5], [4, 5, 6]]]

2 Create a 3D List of Strings

In this example,

  1. We initialize a 3D list using List>>, where each innermost list represents a row in the 2D plane of strings.
  2. We use nested for loops to populate the 3D list with strings or perform operations on each element.

Kotlin Program

fun main() {
    val matrix3D = List(2) {
        List(2) {
            MutableList(2) { "" }
        }
    }

    for (i in matrix3D.indices) {
        for (j in matrix3D[i].indices) {
            for (k in matrix3D[i][j].indices) {
                matrix3D[i][j][k] = "($i, $j, $k)"
            }
        }
    }

    println(matrix3D)
}

Output

[[[(0, 0, 0), (0, 0, 1)], [(0, 1, 0), (0, 1, 1)]], [[(1, 0, 0), (1, 0, 1)], [(1, 1, 0), (1, 1, 1)]]]

Summary

In this tutorial, we learned How to create a Three Dimensional List in Kotlin language with well detailed examples.


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  2. How to Initialize a List in Kotlin ?
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  28. How to Iterate over a Two Dimensional List in Kotlin ?
  29. How to create a Three Dimensional List in Kotlin ?
  30. How to Copy a List in Kotlin ?
  31. How to deep Copy a List in Kotlin ?
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  37. How to Concatenate Two Lists in Kotlin ?
  38. How to check if Two Lists are Equal in Kotlin ?
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  40. How to Convert a List of Integers to a List of Strings in Kotlin ?
  41. How to Convert a List of Strings to a List of Integers in Kotlin ?
  42. How to Convert a List of Floats to a List of Strings in Kotlin ?
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