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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 7387c8f97b
commit cb5bb5e222
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12
Task/Add-a-variable-to-a-class-instance-at-runtime/Ruby/add-a-variable-to-a-class-instance-at-runtime-1.rb Normal file
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class Empty
end
e = Empty.new
class << e
attr_accessor :foo
end
e.foo = 1
puts e.foo # output: "1"
f = Empty.new
f.foo = 1 # raises NoMethodError

10
Task/Add-a-variable-to-a-class-instance-at-runtime/Ruby/add-a-variable-to-a-class-instance-at-runtime-2.rb Normal file
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yes_no = "Yes"
def yes_no.not
replace( self=="Yes" ? "No": "Yes")
end
#Demo:
p yes_no.not # => "No"
p yes_no.not # => "Yes"
p "aaa".not # => undefined method `not' for "aaa":String (NoMethodError)