dog.rb
class Dog
def initialize(name)
@name = name
end
def set_nickname(nickname) #set with ruby_I don't use hoge, but this time I'll give it a try for simplicity!
@nickname = nickname
end
def print_nickname
if !defined?(@nickname)
puts('Not Set')
return
end
puts(@nickname)
end
end
If it is nil when you refer to if @age, you don't know which of the following cases.
-Is it nil because it has never been defined? --Is it the result of assigning @nickname = nil once?
In such a case, you should use defind? (@Age).
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