February 2017
Beginner to intermediate
318 pages
5h 41m
English
Content preview from Learning Functional Data Structures and Algorithms
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Copy-on-write
What if we have never mutated data? When we need to update, we could copy and update the data. Consider the following Scala snippet:
scala> val x = 1 to 10 x: scala.collection.immutable.Range.Inclusive = Range(1, 2, 3, 4, 5, 6, 7, 8, 9, 10) scala> x map (_ / 2) filter ( _ > 0 ) partition ( _ < 2 ) res4: (scala.collection.immutable.IndexedSeq[Int], scala.collection.immutable.IndexedSeq[Int]) = (Vector(1, 1),Vector(2, 2, 3, 3, 4, 4, 5))
Here is a figure showing all of the copying in action:
This is copy-on-write semantics: we make a new data structure every time a change happens to the original data structure. Note the way the filter ...
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