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Is there a way in Ruby to make a copy of multi-dimensional array? I mean some built-in function.
When I try to use .dup it just returns reference:
irb(main):001:0> a = [[1,2,3], [4,5,6]]
=> [[1, 2, 3], [4, 5, 6]]
irb(main):002:0> b = a.dup
=> [[1, 2, 3], [4, 5, 6]]
irb(main):003:0> b[0][0] = 15
=> 15
irb(main):004:0> a == b
=> true
You need to dup the arrays in the list instead of just the outer one. The easiest way is probably something like