Scala in the 84th: Scala in the list and Listbuffer design to realize the thinking after learning sense

Final Case class:: [B] (private var hd:b, Private[scala] var tl:list[b]) extends List[b]

TL is limited access through private to ensure the immutability of TL, so that in the building of the head element HD different and then the list of the same new list can be directly pointed to the TL, efficient.

This ensures both functional programming and efficient creation of new objects.

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Scala in the 84th: Scala in the list and Listbuffer design to realize the thinking after learning sense