[](key)
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def [](key) @hash[key] end
[]=(key, value)
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def []=(key, value) @hash[key] = value end
clear()
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def clear() @hash.clear end
delete(key)
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def delete(key)
value = @hash[key]
@hash.delete(key)
value
end
key?(key)
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def key?(key)
@hash.keys.include?(key)
end