Ruby 九九乘法表

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(1..9).map{|a| (1..a).map{|b| "#{b}*#{a}=#{a*b}" }} .flatten

=> ["1*1=1","1*2=2","2*2=4","1*3=3","2*3=6","3*3=9","1*4=4","2*4=8","3*4=12","4*4=16","1*5=5","2*5=10","3*5=15","4*5=20","5*5=25","1*6=6","2*6=12","3*6=18","4*6=24","5*6=30","6*6=36","1*7=7","2*7=14","3*7=21","4*7=28","5*7=35","6*7=42","7*7=49","1*8=8","2*8=16","3*8=24","4*8=32","5*8=40","6*8=48","7*8=56","8*8=64","1*9=9","2*9=18","3*9=27","4*9=36","5*9=45","6*9=54","7*9=63","8*9=72","9*9=81"]

(1..9).map{|a| (1..a).map{|b| "#{b}*#{a}=#{a*b}" }} .join ' '

=> "1*1=1 1*2=2 2*2=4 1*3=3 2*3=6 3*3=9 1*4=4 2*4=8 3*4=12 4*4=16 1*5=5 2*5=10 3*5=15 4*5=20 5*5=25 1*6=6 2*6=12 3*6=18 4*6=24 5*6=30 6*6=36 1*7=7 2*7=14 3*7=21 4*7=28 5*7=35 6*7=42 7*7=49 1*8=8 2*8=16 3*8=24 4*8=32 5*8=40 6*8=48 7*8=56 8*8=64 1*9=9 2*9=18 3*9=27 4*9=36 5*9=45 6*9=54 7*9=63 8*9=72 9*9=81"

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