add return type other than Unit onto the prepend() function in trait … #919
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…Bird I don't think this page intends to have a Unit return type for prepend. Without it, prepend() doesn't do anything useful: ```scala> birdList.prepend(new EuropeanSwallow)``` returns Unit. So add the return type so prepend() does what the reader expects it to. With the suggested change, I get ```scala> birdList.prepend(new EuropeanSwallow) res16: Node[Bird] = ListNode(EuropeanSwallow(),ListNode(AfricanSwallow(),Nil()))```
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good catch, thanks! |
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…Bird
I don't think this page intends to have a Unit return type for prepend. Without it, prepend() doesn't do anything useful:
scala> birdList.prepend(new EuropeanSwallow)returns Unit. So add the return type so prepend() does what the reader expects it to. With the suggested change, I getscala> birdList.prepend(new EuropeanSwallow) res16: Node[Bird] = ListNode(EuropeanSwallow(),ListNode(AfricanSwallow(),Nil()))