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bokuo-okubo/instance_eval.rb

Created November 25, 2015 10:46
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instance_eval.rb
class Person
@name
def hello
p @name ||= 'Michael'
end
end
man = Person.new
man.hello # => "Michael"
man.name # => NoMethodError: undefined method `name' for #<Person:0x007f9823877f68 @name="Michael">
man.instance_eval { @name = 'John' }
man.hello # => "John"
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