On Monday, 2011-10-03 at 19:17 , David Herman wrote:
> A couple reactions: > > - strings are already interned in current engines for symbol-like > performance; there's no need to introduce symbols into the language > Assuming that's about Ruby like [symbols](http://www.ruby-doc.org/core-1.9.2/Symbol.html) or Clojure like [keywords](http://clojure.org/data_structures#toc8). While they are not much different from strings I really miss them in JS. Also I think clojure uses them in a very interesting way: (use 'clojure.contrib.shell-out :as shell :reload) or even more intensive (ns com.my-company.clojure.examples.my-utils (:import java.util.Date) (:use [clojure.contrib.def :only (defvar-)]) (:require [clojure.contrib.shell-out :as shell])) Problem with strings is that it's not always obvious weather it's intended argument to the function or a flag. > - private names are overkill for most uses of enums; just use string literals > > - in SpiderMonkey I think you get better performance if your switch cases use > known constants; for example: > > const RED = "red", GREEN = "green", BLUE = "blue"; > ... > switch (color) { > case RED: ... > case GREEN: ... > case BLUE: ... > } > > - with modules, you would be able to define these consts and share them > modularly (currently in SpiderMonkey the only way to share these definitions > across modules as consts is either to make them global or to share an > eval-able string that each module can locally eval as a const declaration -- > blech) > > Dave > > On Sep 30, 2011, at 7:13 PM, Axel Rauschmayer wrote: > > > One language feature from JavaScript that I miss are enums. Would it make > > sense to have something similar for ECMAScript, e.g. via > > Lisp-style/Smalltalk-style symbols plus type inference? If yes, has this > > been discussed already? I feel strange when I simulate symbols with strings. > > > > -- > > Dr. Axel Rauschmayer > > > > a...@rauschma.de (mailto:a...@rauschma.de) > > twitter.com/rauschma (http://twitter.com/rauschma) > > > > home: rauschma.de (http://rauschma.de) > > blog: 2ality.com (http://2ality.com) > > > > > > > > _______________________________________________ > > es-discuss mailing list > > es-discuss@mozilla.org (mailto:es-discuss@mozilla.org) > > https://mail.mozilla.org/listinfo/es-discuss > > _______________________________________________ > es-discuss mailing list > es-discuss@mozilla.org (mailto:es-discuss@mozilla.org) > https://mail.mozilla.org/listinfo/es-discuss
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