Multiplication Table

mult_table.rb

def mult_table(num, spaces)
  max_space = (num * num).to_s.length + spaces
  rows = []
  (1..num).each do |row|
    rows << (1..num).inject('') { |r,col| r += sprintf("%#{max_space}d", row * col) }
  end  
  rows
end  
 
mult_table(12, 2).each { |row| puts row }
mult_table(4, 5).each { |row| puts row }