class Questions::Issue20260216

Answers::Issue20260216

Question

You have a 2D grid of numbers. Write a function that zooms in by an integer factor k >= 2 by turning each cell into a k x k block with the same value, returning the bigger grid.

Examples

Public Instance Methods

setup ()

Source

# File questions/20260216.rb, line 21
def setup
  @methods  = Answers::Issue20260216.instance_methods(false)
  @examples = [
    {
      initial_grid: [
        [1, 2],
        [3, 4],
      ],
      zoom_factor: 2,
      bigger_grid: [
        [1, 1, 2, 2],
        [1, 1, 2, 2],
        [3, 3, 4, 4],
        [3, 3, 4, 4],
      ],
    },
    {
      initial_grid: [
        [7, 8, 9],
      ],
      zoom_factor: 3,
      bigger_grid: [
        [7, 7, 7, 8, 8, 8, 9, 9, 9],
        [7, 7, 7, 8, 8, 8, 9, 9, 9],
        [7, 7, 7, 8, 8, 8, 9, 9, 9],
      ],
    },
    {
      initial_grid: [
        [1],
        [2],
      ],
      zoom_factor: 3,
      bigger_grid: [
        [1, 1, 1],
        [1, 1, 1],
        [1, 1, 1],
        [2, 2, 2],
        [2, 2, 2],
        [2, 2, 2],
      ],
    },
  ]
end

Tests

Public Instance Methods

test_answers ()

Source

# File questions/20260216.rb, line 68
def test_answers
  @methods.each do |method|
    @examples.each do |example|
      bigger_grid = public_send(method, example[:initial_grid], example[:zoom_factor])

      assert_equal example[:bigger_grid],  bigger_grid, "Answer #{method} is not correct"
      refute_same  example[:initial_grid], bigger_grid, "Answer #{method} is messing with the grid"
    end
  end
end

test_wrong_argument ()

Source

# File questions/20260216.rb, line 79
def test_wrong_argument
  initial_grid = [[1]]

  assert_raises(ArgumentError) { izkreny_zoom_each_with_index_times(initial_grid, 1)   }
  assert_raises(ArgumentError) { izkreny_zoom_each_with_index_times(initial_grid, 2.0) }
end