point ! I'll try to refactor my code to include maps. However, as mentionned above, I will have most probably to include JAVA librairies into my modules (maths), and might loose overall Immutability through these as well.
Thx everybody for the very helpful advises. Cheers Jean-Marc 2013/11/12 Charles Duffy <[email protected]> > On Tue, Nov 12, 2013 at 3:05 PM, jean-marc Mercier < > [email protected]> wrote: > >> Thus I could use maps to simulate HashSet, it not a very big overload. >> However, is there any incentive to trade off 20% performance ? >> > > Immutability is its own reward, or, rather, comes with its own set of > them. :) > > Working with immutable data makes lock-free thread-safety comparatively > trivial, and enables a wide array of aggressive optimizations (including > providing the compiler the option to make operations concurrent at-will; > safe caching/memoization; etc). > > Moreover, introducing things that *aren't* known to be immutible, > thread-safe, deterministic operations into an environment where those > guarantees otherwise exist means that a lot of optimizations are suddenly > off-the-table / unsafe. >
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