[5]<=>[4,9]

irb(main):063:0> "aab" <=> "acb"
=> -1
irb(main):064:0> [5]<=>[4,9]
=> 1
irb(main):065:0> puts [5]<=>[4,9]
1
=> nil
irb(main):066:0> (0..9)=== 3.14
=> true
irb(main):067:0> puts (0..9)=== 3.14
true
=> nil
irb(main):068:0> ('a'..'f')=== 'c'
=> true
irb(main):069:0> [5]<=[4,9]
NoMethodError: undefined method `<=' for [5]:Array
        from (irb):69
        from E:/Ruby193/bin/irb:12:in `<main>'
irb(main):070:0> 5<=5
=> true
irb(main):071:0> 5<=4
=> false
irb(main):072:0> 5<=9
=> true