Print out a multiplication table

multiplication-table-test.rb

require 'multiplication-table'

require 'minitest/autorun'
class TestPrinter < MiniTest::Unit::TestCase
  def test_for_create_table
    table = create_mult_table(3)
    
    assert_equal(3, table.size)
    assert_equal(3, table[0].size)
    assert_equal(9, table[2][2])
  end
end

multiplication-table.rb

# print out a multiplication table

# 1 2 3 4 5
# 2 4 6 8 10
# 3 6 9 12 15
# 4 8 12 16 20
# 5 10 15 20 25

def create_mult_table(max)
  return if max.nil?

  table = []
  for i in 1..max
    row = Array.new(max) { |idx| ( idx + 1 ) * i }
    table << row
  end
  return table
end

def print_table(table)

  table.each do |row|
    p row.join(" ")
  end
  return nil
end