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Introduction to Scala Part2 : Collections

Bubu
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Traversable : Addition

  • Operation ++
  • Goal: appends two traversables together, or appends all elements of an iterator to a traversable.
> List(1, 2, 3) ++ List(4, 5, 6)
res0: List[Int] = List(1, 2, 3, 4, 5, 6)
concatate two lists
concatate an empty list with a list
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