Question

How to create a two dimensional (2D) array in Ruby

Answer 1

rows = 3;
cols = 4;

arr = Array.new(rows) { Array.new(cols) }

print arr;




# run:
#
# [[nil, nil, nil, nil], [nil, nil, nil, nil], [nil, nil, nil, nil]]
#

 

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Answer 2

arr = [
  [0, 0, 0, 0],
  [0, 0, 0, 0],
  [0, 0, 0, 0]
]

print arr;




# run:
#
# [[0, 0, 0, 0], [0, 0, 0, 0], [0, 0, 0, 0]]
#

 

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