ruby-uebungen/Assignment_020/solution/readme.md

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# Lösung: Callback mit Proc
<div style="border: 1px solid grey;"><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br></div>```ruby
def rechner(a, b, lam = nil, &block)
lam ||= block
ergebnis = lam.call(a, b)
ergebnis * 2
end
lam = ->(a, b) { a + b }
puts rechner(5, 4, lam) # -> 18
```