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public text v1 · immutableirb(main):001:0> def myfunc(blah = {})
irb(main):002:1> @blah = blah
irb(main):003:1> @blah
irb(main):004:1> end
=> nil
irb(main):005:0> myfunc
=> {}
irb(main):006:0> myfunc(nil)
=> nil
irb(main):001:0> def myfunc(blah = {})
irb(main):002:1> @blah = blah
irb(main):003:1> @blah
irb(main):004:1> end
=> nil
irb(main):005:0> myfunc
=> {}
irb(main):006:0> myfunc(nil)
=> nil