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# Lösung: Eigenclass einer Klasse
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```ruby
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class Numeric
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class << self
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def to_binary(n)
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n.to_s(2)
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end
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end
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end
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puts Numeric::to_binary(47)
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```
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Alternative Lösung:
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```ruby
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class << Numeric
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def to_binary(n)
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n.to_s(2)
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end
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end
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puts Numeric::to_binary(47)
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```
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