tno at thenewobjective.com
Thu Dec 7 17:35:33 UTC 2017
On Thu, Dec 7, 2017 at 11:15 AM, Michał Wadas <michalwadas at gmail.com> wrote:
> Only extremely small subset of functions can be proven to be pure. And I
> suppose that these functions are already optimized by engines.
> notPure = (a,b) => a + b; // implicit conversion with side effects can
> notPure = (a) => a && a.b; // getter can be called
> notPure = (foo, bar) => Reflect.has(foo, bar); // proxy trap can be
> called. Someone could overwrite Reflect.has
> It would be better idea to have builtin decorator *@pure* that allow
> engine to remove or reorganize function calls (and valid implementation can
> treat it as no-op).
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