Nice one!
It doesn’t even have to be Name.create() – new Object() works just fine. And
you can use switch with this pattern (I ES5-ified the code):
function Enum() {
let e = {};
Array.prototype.forEach.call(arguments,
function(name) {
e[name] = new Object();
});
return Object.freeze(e);
}
var color = Enum("red", "green", "blue");
var c = color.green;
switch(c) {
case color.red:
alert("red");
break;
case color.green:
alert("green");
break;
}
On Oct 3, 2011, at 1:44 , Allen Wirfs-Brock wrote:
>
> On Sep 30, 2011, at 7:33 PM, Dean Landolt wrote:
>
>>
>>
>> On Fri, Sep 30, 2011 at 10:13 PM, Axel Rauschmayer <[email protected]> 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.
>>
>>
>> ISTM private name objects make a pretty nice stand-in for symbols.
>
> function Enum(...names) {
> let e = Object.create();
> names.forEach(function(n) {e[n] = Name.create()});
> return Object.freeze(e);
> }
>
> ...
>
> const colors = Enum('red,'blue','green',yellow',orange','purple');
> backgournd = colors.red;
> foreground = colors.blue;
> ...
>
>
> Allen
--
Dr. Axel Rauschmayer
[email protected]
twitter.com/rauschma
Home: rauschma.de
Blog: 2ality.com
_______________________________________________
es-discuss mailing list
[email protected]
https://mail.mozilla.org/listinfo/es-discuss
