I think it false view that immutable/functional constructs are slow by
default. Instead, a lot of it comes down to lack of support in the popular
VMs for these constructs. For example the following code:
(defn add-fn [& args]
(reduce -add 0 args))
(loop [x 0]
(if (eq x 10000)
x
(recur (add-fn x 1))))
Is never going to be super fast in Clojure, but it compiles down to a loop
with 4 assembly operations in Pixie (https://github.com/pixie-lang/pixie)
all while remaining fully dynamic. But that's because the VM is tuned to
optimize things like varargs and reduce. You can't really tap into the VM
at that level on the CLR or the JVM.
That's not to say that Pixie is always faster than these platforms, on the
contrary, it's often much slower on GC heavy operations. But hopefully
someday we'll reach the holy grail of a VM that aggressively optimizes
dynamic languages without requiring hinting or rewriting into less
idiomatic forms.
Timothy
On Thu, May 14, 2015 at 12:36 PM, Raoul Duke <rao...@gmail.com> wrote:
> Ditto F# vs. C#.
>
> One has to wonder when / where / if functional-pure-immutable
> approaches will ever under the covers get "fast enough"?
>
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