How to create a Two Dimensional Array in Ruby

◀ Previous Next ▶

How to create a Two Dimensional Array in Ruby ?

Answer

To create a Two Dimensional Array in Ruby, you can use arrays within an array.

✐ Examples

1 Creating a 2D Array of Integers

In this example,

We declare and initialize a 2D array of integers named matrix with dimensions 3x3.
We assign values to the elements of the array.
The outer loop iterates over rows, and the inner loop iterates over columns to fill the array.

Ruby Program

matrix = Array.new(3) { Array.new(3) }
matrix.each_with_index do |row, i|
  row.each_with_index do |_, j|
    matrix[i][j] = i + j
  end
end
puts matrix.inspect

Output

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

2 Creating a 2D Array of Strings

In this example,

We declare and initialize a 2D array of strings named matrix with dimensions 2x2.
We assign values to the elements of the array.
The outer loop iterates over rows, and the inner loop iterates over columns to fill the array.

Ruby Program

matrix = Array.new(2) { Array.new(2) }
matrix.each_with_index do |row, i|
  row.each_with_index do |_, j|
    matrix[i][j] = "Row #{i + 1}, Column #{j + 1}"
  end
end
puts matrix.inspect

Output

[["Row 1, Column 1", "Row 1, Column 2"], ["Row 2, Column 1", "Row 2, Column 2"]]

Summary

In this tutorial, we learned How to create a Two Dimensional Array in Ruby language with well detailed examples.

◀ Previous Next ▶

Ruby Tutorials

Ruby How-Tos

How to create a Two Dimensional Array in Ruby

How to create a Two Dimensional Array in Ruby ?

Answer

✐ Examples

1 Creating a 2D Array of Integers

Ruby Program

Output

2 Creating a 2D Array of Strings

Ruby Program

Output

Summary

More Ruby Arrays Tutorials