module_prepend.rb
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singleton_class.rb
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module_prepend.rb
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module Cacheable↵
def self.prepended(base)↵
base.singleton_class.prepend(ClassMethods)↵
end↵
def fetch(key, &block)↵
@cache ||= {}↵
@cache[key] ||= block.call↵
end↵
end
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