Ruby

if [#q4cb3960]

  x >= y y以上
  x <= y y以下 

パターン１ [#h3b9be82]

 a = 10
 if a > 10 then
   puts "BIG"
 else
   puts "Not big"
 end

パターン２（省略系） [#mf8293f7]

 a = 10
 puts "BIG"  if a > 9

パターン３ （省略系）[#ffe51460]

 a = 10
 puts a > 9 ? "big" : "small"

case [#oe501c63]

 signal = "pink"
 
 case signal
 when "red"
  puts "STOP"
 when "yellow"
  puts "STOP"
 when "green", "blue"
  puts "GO"
 else
  puts "no signal"
 end