Spaceship operator
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Spaceship operator <=> returns -1, 0, or 1
puts 3 <=> 3 # 0
puts 3 <=> 4 # -1
puts 4 <=> 3 # 1
puts "a" <=> "a" # 0
puts "a" <=> "b" # -1
puts "b" <=> "a" # 1
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<=>
Spaceship operator <=> returns -1, 0, or 1
puts 3 <=> 3 # 0
puts 3 <=> 4 # -1
puts 4 <=> 3 # 1
puts "a" <=> "a" # 0
puts "a" <=> "b" # -1
puts "b" <=> "a" # 1