August 2011
Intermediate to advanced
280 pages
6h 50m
English
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Persistent/Immutable Data Structures
In the pure immutable design for the net work-years example, we asked each person to create a new total. As we go through the chain of people, a new number is created while an old number is discarded—not a big deal since the numbers are relatively small.
The data we have to deal with may not be that small; it could be a list, tree, or matrix. We may need to work with objects that represent a boiler, a satellite, a city, and so on. We won’t naively copy these large objects over and over because that’ll lead to poor performance. Immutable or persistent data structures come to the rescue here.
Persistent[9] data structures version their values so older and newer values stay around or persist over time without ...
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