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I'm pretty new to Scala and try to understand mutable Seq. Since it's in package mutable I expected there is a method that allows us to append element without copying the whole collection.
But there is no += method in the mutable.Seq, but in Buffer is. :+ and +: both copy the collection.
So why is it mutable?
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mutable. Seq has update , that allows you to change the element at a given index, but it does not grow or shrink. Buffer is s specialization of Seq , that is both mutable and growable.
Scala's default Seq class is mutable. Yes, you read that right.
Scala Seq is a trait to represent immutable sequences. This structure provides index based access and various utility methods to find elements, their occurences and subsequences. A Seq maintains the insertion order.
Because mutable and growable isn't the same thing.
(the latter is one specific type of the former: everything, that's growable is mutable, but not everything that's mutable is growable).
mutable.Seq has update, that allows you to change the element at a given index, but it does not grow or shrink.
Buffer is s specialization of Seq, that is both mutable and growable.
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