Thanks to Charlie, this is great for us to have 15-minute code kata every weekday .

transpose_mock.rb

# write a method called "transpose" that takes this array of arrays:

# [
# ['first', 'second'],
# ['third', 'fourth']
# ]

# and transposes it into this array of arrays

# [
# ['first', 'third'],
# ['second', 'fourth']
# ]

# you can think of it as rows become columns
# I know there is an Array method called "transpose" but
# I am asking you to write your own

def transpose(before)
  before_row_count = before.count
  before_col_count = before[0].count

  after = Array.new(before_col_count, [])

  (0...before_row_count).each do |i|
    (0...before_col_count).each do |j|
      after[j][i] = before[i][j]
    end
  end

  after
end

puts transpose([
['first', 'second'],
['third', 'fourth']
]
).inspect
# [["first", "third"], ["second", "fourth"]]

puts transpose([
['0-0', '0-1', '0-2'],
['1-0', '1-1', '1-2']
]
).inspect
# [["0-0", "1-0"], ["0-1", "1-1"], ["0-2", "1-2"]]