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Alex Rivera
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Say, I have a sequence of strings as an input and I want to get a new immutable Seq which consists of elements of the input and an item "c" . Here are two methods that I've discovered to be working: assert(Seq("a", "b", "c") == Seq("a", "b") ++ Seq("c")) - the problem with this one is that it seems that instantiating a temporary sequence ( Seq("c") ) just for the sake of the operation is rendundant and will result in overhead assert(Seq("a", "b", "c") == List("a", "b") ::: "c" :: Nil) - this one restricts the type of input collection to be a List , so Seq("a", "b") ::: "c" :: Nil won't work. Also it seems that instantiating a Nil may aswell result in overhead My questions are: Is there any other way of performing this operation? Which one is better? Isn't Seq("a", "b") ::: Nil not being allowed a flaw of Scala's developers?
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