What do you use instead of enum?

I wanted to do a state machine with symbolic states, but I see enum is
not part of the standard. I only have seven, do I just make seven vars
and hand enumerate?

kt

re: What do you use instead of enum?

On Oct 14, 5:15*am, Kenny <kentil...@gmail.comwrote:http://dean.edwards.name/weblog/2006/07/enum/

re: What do you use instead of enum?

On 2008-10-14 16:17, Laser Lips wrote:I don't think that's what he was talking about; it sounds more like C's
enum declarations:

enum MYSTATES {
state_1,
state_2,
..
} state;

Since there are no user-definable constants in ECMAScript (yet), enums
don't make much sense. Just use variables and assign the numbers
yourself, or roll your own function that does enumeration. Mozilla has
had non-standard "const" declarations for some time, and Opera has
implemented them too. They're obviously not portable, but YMMV.


- Conrad

re: What do you use instead of enum?

Kenny wrote:
As for style, I might rather use constant case.

var LEFT = 0,
TOP = 1,
RIGHT = 2,
BOTTOM = 3;

Garrett

--
comp.lang.javascript FAQ <URL: http://jibbering.com/faq/ >

re: What do you use instead of enum?

dhtml wrote:good point. I did that in my C days as well.

I see JS itself supports const, but not ECMAScript. I gather folks stick
with the latter standard to avoid browser-battling?

Food for flamewar: how much Web developer energy is wasted on browsers
not being compatible? Frightening thought, adding up all the
person-hours. For my money the Web is about the coolest thing
civilization has ever done, and the browsers (esp. IE, I hear) are a
huge sea-anchor on the whole deal.

kt

re: What do you use instead of enum?

In comp.lang.javascript message <48f4ba43$0$4919$607ed4bc@cv.net>, Tue,
14 Oct 2008 11:26:30, Kenny <kentilton@gmail.composted:
I was wondering whether it might be done in JavaScript by writing that as
enumm ("left, top, right, bottom");
and having a function enumm which edited that string into a string or
strings such as "left=0", "top=1", "right=2; bottom=3;" and then using
eval. That could be a new use for the "eval" section of the FAQ.

This one-liner function works in my Firefox 2.0.0.17, and Opera 9.27, and
Safari 3.1.2, and in Chrome and IE7 if top is mis-spelt topp .

function enumm(S) { for (var J=0, A=S.split(/\W+/), L=A.length ; J<L ; J++) eval( A[J] + "=" + J ) }
enumm ("left, top, right, bottom")
alert(bottom + " # " + top)

In case it matters : that's testing in my js-quick.htm, which executes
it by calling a function which calls eval.

By adding code to enumm, non-contiguous enumeration could be supported :
enumm ("left, top, right=77, bottom"); // bottom==78
and the string could include variable references ... .

Your move.

--
(c) John Stockton, nr London UK. ?@merlyn.demon.co.uk BP7, Delphi 3 & 2006.
<URL:http://www.merlyn.demon.co.uk/TP/BP/Delphi/&c., FAQqy topics & links;
<URL:http://www.bancoems.com/CompLangPascalDelphiMisc-MiniFAQ.htmclpdmFAQ;
NOT <URL:http://support.codegear.com/newsgroups/>: news:borland.* Guidelines

re: What do you use instead of enum?

On 2008-10-14 23:26, Kenny wrote:ECMAScript is the underlying standard for all of the implementations; it
has reserved the "const" keyword for possible future use.
Netscape/Mozilla's JavaScript is one of many implementations of
ECMAScript, and they've decided to implement "const". Personally, I
welcome that, but as long as it's not portable, it's not much use
outside of closed environments like intranets.
Not much food for a flame war, I think everybody is well aware of the
cost, except maybe Microsoft. Here's a breakdown from a related field
(web design), that made me chuckle and cry at the same time:

http://www.flickr.com/photos/mringlein/316476217/
I agree 100%.


- Conrad

re: What do you use instead of enum?

Conrad Lender wrote:Nice/ I had a feeling I was about the last to discover this. :) I am
pleased that I quickly figured out the bit about Just Use a Table
instead of wrestling with CSS. (Tho the tables are so ghastly I can tell
I am not done yet on this issue.)

It is a shame about the slices for Microsoft and Bill. What was the
point for Bill? Now he is frustrated trying to give it away effectively.
With Sir Thomas More's rebuke in A Man For All Seasons: "It profits a
man nothing if he gains the world and loses his soul, Bill, but for a
monopoly on desktop computing?"
OK, let's have Al Gore finish creating the Internet after he finishes
with global warming.

:)

kt

re: What do you use instead of enum?

Kenny wrote:You can use strings. The strings are used as keys to select actions and
transitions from an object that can be built with an object literal.

{
go: function () {
state = 'ok';
},
ovalue: function () {
state = 'ocomma';
},
firstavalue: function () {
state = 'acomma';
},
avalue: function () {
state = 'acomma';
}
}

See http://www.json.org/json_parser_state.js for an example.