On 3/21/14, 5:44 AM, Andy Smith wrote:
Im also interested as to why the mutable state approach would be less
performant? In the single thread case the locks would be optimized out
right?
No locks are used when using atoms, only compare-and-swap (CAS)
operations. While CAS operations are fast you don't want to use them
unless you need to in a multi-threaded system. Clojure nor the JVM will
"optimize out" the use of them in a single-threaded case like this.
They are a very heavy approach when all you need is local mutation.
Clojure doesn't have local mutation out of the box.. it is very
opinionated on how state should be handled. The example solution posted
earlier in the thread is more indiciative of how state like this is
handled in clojure.
As pointed out earlier in the thread if you wanted/needed to have local
mutation you could use https://github.com/ztellman/proteus. In the vast
majority of cases this is unneeded.
-Ben
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