ruby-uebungen/Assignment_019/solution/readme.md

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# Lösung: Callback mit Block
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```ruby
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def rechner(a, b)
ergebnis = yield a, b
ergebnis * 2
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end
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puts rechner(5, 4) { |a, b| a + b }
puts rechner(5, 4) { |a, b| a - b }
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```