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    It can mean that, but most immutable data structures reuse the underlying data for the changes. Eric Lippert has a great blog series about immutability in C# Commented Dec 24, 2012 at 20:00
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    I would take a look at Purely Functional Data Structures, It's a great book that is written by the same guy who wrote most of Haskell's container library (though the book is primarily SML) Commented Dec 25, 2012 at 0:23
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    This answer, related to running time instead of memory consumption, may also be interesting for you: stackoverflow.com/questions/1990464/… Commented Dec 25, 2012 at 3:10
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    You might find this interesting: en.wikipedia.org/wiki/Static_single_assignment_form Commented Feb 13, 2013 at 17:13