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irb(main):001:0>a=[1,2,5,3,9,0,9]=>[1, 2, 5, 3, 9, 0, 9]
irb(main):002:0>a-[2]
=>[1, 5, 3, 9, 0, 9]
irb(main):004:0>a
=>[1, 2, 5, 3, 9, 0, 9]
irb(main):005:0>a-[4]
=>[1, 2, 5, 3, 9, 0, 9]
没错,类也是对象irb(main):001:0>String.class
=>Class
irb(main):002:0>Class.class
=>Class
irb(main):003:0>Class.superclass
=>Module
irb(main):004:0>